/* packet-kerberos.c * Routines for Kerberos * Wes Hardaker (c) 2000 * wjhardaker@ucdavis.edu * Richard Sharpe (C) 2002, rsharpe@samba.org, modularized a bit more and * added AP-REQ and AP-REP dissection * * Ronnie Sahlberg (C) 2004, major rewrite for new ASN.1/BER API. * decryption of kerberos blobs if keytab is provided * * See RFC 1510, and various I-Ds and other documents showing additions, * e.g. ones listed under * * http://clifford.neuman.name/krb-revisions/ * * and * * https://tools.ietf.org/html/draft-ietf-krb-wg-kerberos-clarifications-07 * * and * * https://tools.ietf.org/html/draft-ietf-krb-wg-kerberos-referrals-05 * * Some structures from RFC2630 * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * SPDX-License-Identifier: GPL-2.0-or-later */ /* * Some of the development of the Kerberos protocol decoder was sponsored by * Cable Television Laboratories, Inc. ("CableLabs") based upon proprietary * CableLabs' specifications. Your license and use of this protocol decoder * does not mean that you are licensed to use the CableLabs' * specifications. If you have questions about this protocol, contact * jf.mule [AT] cablelabs.com or c.stuart [AT] cablelabs.com for additional * information. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "packet-kerberos.h" #include "packet-netbios.h" #include "packet-tcp.h" #include "packet-ber.h" #include "packet-pkinit.h" #include "packet-cms.h" #include "packet-windows-common.h" #include "read_keytab_file.h" #include "packet-dcerpc-netlogon.h" #include "packet-dcerpc.h" #include "packet-gssapi.h" #include "packet-x509af.h" void proto_register_kerberos(void); void proto_reg_handoff_kerberos(void); #define UDP_PORT_KERBEROS 88 #define TCP_PORT_KERBEROS 88 #define ADDRESS_STR_BUFSIZ 256 typedef struct kerberos_key { guint32 keytype; int keylength; const guint8 *keyvalue; } kerberos_key_t; typedef struct { guint32 msg_type; gboolean is_win2k_pkinit; guint32 errorcode; gboolean try_nt_status; guint32 etype; guint32 padata_type; guint32 is_enc_padata; guint32 enctype; kerberos_key_t key; kerberos_callbacks *callbacks; guint32 ad_type; guint32 addr_type; guint32 checksum_type; } kerberos_private_data_t; static dissector_handle_t kerberos_handle_udp; /* Forward declarations */ static int dissect_kerberos_Applications(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_AuthorizationData(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_PA_ENC_TIMESTAMP(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); #ifdef HAVE_KERBEROS static int dissect_kerberos_PA_ENC_TS_ENC(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); #endif static int dissect_kerberos_PA_PAC_REQUEST(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_PA_S4U2Self(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_PA_S4U_X509_USER(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_ETYPE_INFO(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_ETYPE_INFO2(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_AD_IF_RELEVANT(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_PA_AUTHENTICATION_SET(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_PA_FX_FAST_REQUEST(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_EncryptedChallenge(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_PA_FX_FAST_REPLY(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_PA_PAC_OPTIONS(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_KERB_AD_RESTRICTION_ENTRY(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); static int dissect_kerberos_SEQUENCE_OF_ENCTYPE(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_); /* Desegment Kerberos over TCP messages */ static gboolean krb_desegment = TRUE; static gint proto_kerberos = -1; static gint hf_krb_rm_reserved = -1; static gint hf_krb_rm_reclen = -1; static gint hf_krb_provsrv_location = -1; static gint hf_krb_pw_salt = -1; static gint hf_krb_ext_error_nt_status = -1; static gint hf_krb_ext_error_reserved = -1; static gint hf_krb_ext_error_flags = -1; static gint hf_krb_address_ip = -1; static gint hf_krb_address_netbios = -1; static gint hf_krb_address_ipv6 = -1; static gint hf_krb_gssapi_len = -1; static gint hf_krb_gssapi_bnd = -1; static gint hf_krb_gssapi_dlgopt = -1; static gint hf_krb_gssapi_dlglen = -1; static gint hf_krb_gssapi_c_flag_deleg = -1; static gint hf_krb_gssapi_c_flag_mutual = -1; static gint hf_krb_gssapi_c_flag_replay = -1; static gint hf_krb_gssapi_c_flag_sequence = -1; static gint hf_krb_gssapi_c_flag_conf = -1; static gint hf_krb_gssapi_c_flag_integ = -1; static gint hf_krb_gssapi_c_flag_dce_style = -1; static gint hf_krb_midl_version = -1; static gint hf_krb_midl_hdr_len = -1; static gint hf_krb_midl_fill_bytes = -1; static gint hf_krb_midl_blob_len = -1; static gint hf_krb_pac_signature_type = -1; static gint hf_krb_pac_signature_signature = -1; static gint hf_krb_w2k_pac_entries = -1; static gint hf_krb_w2k_pac_version = -1; static gint hf_krb_w2k_pac_type = -1; static gint hf_krb_w2k_pac_size = -1; static gint hf_krb_w2k_pac_offset = -1; static gint hf_krb_pac_clientid = -1; static gint hf_krb_pac_namelen = -1; static gint hf_krb_pac_clientname = -1; static gint hf_krb_pac_logon_info = -1; static gint hf_krb_pac_credential_data = -1; static gint hf_krb_pac_credential_info = -1; static gint hf_krb_pac_credential_info_version = -1; static gint hf_krb_pac_credential_info_etype = -1; static gint hf_krb_pac_s4u_delegation_info = -1; static gint hf_krb_pac_upn_dns_info = -1; static gint hf_krb_pac_upn_flags = -1; static gint hf_krb_pac_upn_dns_offset = -1; static gint hf_krb_pac_upn_dns_len = -1; static gint hf_krb_pac_upn_upn_offset = -1; static gint hf_krb_pac_upn_upn_len = -1; static gint hf_krb_pac_upn_upn_name = -1; static gint hf_krb_pac_upn_dns_name = -1; static gint hf_krb_pac_server_checksum = -1; static gint hf_krb_pac_privsvr_checksum = -1; static gint hf_krb_pac_client_info_type = -1; static gint hf_krb_pac_client_claims_info = -1; static gint hf_krb_pac_device_info = -1; static gint hf_krb_pac_device_claims_info = -1; static gint hf_krb_pa_supported_enctypes = -1; static gint hf_krb_pa_supported_enctypes_des_cbc_crc = -1; static gint hf_krb_pa_supported_enctypes_des_cbc_md5 = -1; static gint hf_krb_pa_supported_enctypes_rc4_hmac = -1; static gint hf_krb_pa_supported_enctypes_aes128_cts_hmac_sha1_96 = -1; static gint hf_krb_pa_supported_enctypes_aes256_cts_hmac_sha1_96 = -1; static gint hf_krb_pa_supported_enctypes_fast_supported = -1; static gint hf_krb_pa_supported_enctypes_compound_identity_supported = -1; static gint hf_krb_pa_supported_enctypes_claims_supported = -1; static gint hf_krb_pa_supported_enctypes_resource_sid_compression_disabled = -1; static gint hf_krb_ad_ap_options = -1; static gint hf_krb_ad_ap_options_cbt = -1; static gint hf_krb_ad_target_principal = -1; #ifdef HAVE_KERBEROS static gint hf_krb_patimestamp = -1; static gint hf_krb_pausec = -1; #endif #include "packet-kerberos-hf.c" /* Initialize the subtree pointers */ static gint ett_kerberos = -1; static gint ett_krb_recordmark = -1; static gint ett_krb_pac = -1; static gint ett_krb_pac_drep = -1; static gint ett_krb_pac_midl_blob = -1; static gint ett_krb_pac_logon_info = -1; static gint ett_krb_pac_credential_info = -1; static gint ett_krb_pac_s4u_delegation_info = -1; static gint ett_krb_pac_upn_dns_info = -1; static gint ett_krb_pac_device_info = -1; static gint ett_krb_pac_server_checksum = -1; static gint ett_krb_pac_privsvr_checksum = -1; static gint ett_krb_pac_client_info_type = -1; static gint ett_krb_pa_supported_enctypes = -1; static gint ett_krb_ad_ap_options = -1; #ifdef HAVE_KERBEROS static gint ett_krb_pa_enc_ts_enc = -1; #endif #include "packet-kerberos-ett.c" static expert_field ei_kerberos_decrypted_keytype = EI_INIT; static expert_field ei_kerberos_address = EI_INIT; static expert_field ei_krb_gssapi_dlglen = EI_INIT; static dissector_handle_t krb4_handle=NULL; /* Global variables */ static guint32 gbl_keytype; static gboolean gbl_do_col_info; #include "packet-kerberos-val.h" static void call_kerberos_callbacks(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int tag, kerberos_callbacks *cb) { if(!cb){ return; } while(cb->tag){ if(cb->tag==tag){ cb->callback(pinfo, tvb, tree); return; } cb++; } return; } static kerberos_private_data_t* kerberos_get_private_data(asn1_ctx_t *actx) { if (!actx->private_data) { actx->private_data = wmem_new0(wmem_packet_scope(), kerberos_private_data_t); } return (kerberos_private_data_t *)(actx->private_data); } static gboolean kerberos_private_is_kdc_req(kerberos_private_data_t *private_data) { switch (private_data->msg_type) { case KERBEROS_APPLICATIONS_AS_REQ: case KERBEROS_APPLICATIONS_TGS_REQ: return TRUE; } return FALSE; } gboolean kerberos_is_win2k_pkinit(asn1_ctx_t *actx) { kerberos_private_data_t *private_data = kerberos_get_private_data(actx); return private_data->is_win2k_pkinit; } #ifdef HAVE_KERBEROS /* Decrypt Kerberos blobs */ gboolean krb_decrypt = FALSE; /* keytab filename */ static const char *keytab_filename = ""; void read_keytab_file_from_preferences(void) { static char *last_keytab = NULL; if (!krb_decrypt) { return; } if (keytab_filename == NULL) { return; } if (last_keytab && !strcmp(last_keytab, keytab_filename)) { return; } g_free(last_keytab); last_keytab = g_strdup(keytab_filename); read_keytab_file(last_keytab); } #endif /* HAVE_KERBEROS */ #if defined(HAVE_HEIMDAL_KERBEROS) || defined(HAVE_MIT_KERBEROS) #ifdef _WIN32 /* prevent redefinition warnings in krb5's win-mac.h */ #define SSIZE_T_DEFINED #endif /* _WIN32 */ #include enc_key_t *enc_key_list=NULL; static void add_encryption_key(packet_info *pinfo, int keytype, int keylength, const char *keyvalue, const char *origin) { enc_key_t *new_key; if(pinfo->fd->visited){ return; } new_key=(enc_key_t *)g_malloc(sizeof(enc_key_t)); g_snprintf(new_key->key_origin, KRB_MAX_ORIG_LEN, "%s learnt from frame %u",origin,pinfo->num); new_key->fd_num = pinfo->num; new_key->next=enc_key_list; enc_key_list=new_key; new_key->keytype=keytype; new_key->keylength=keylength; /*XXX this needs to be freed later */ new_key->keyvalue=(char *)g_memdup(keyvalue, keylength); } static void used_encryption_key(proto_tree *tree, packet_info *pinfo, kerberos_private_data_t *private_data _U_, enc_key_t *ek, int usage, tvbuff_t *cryptotvb) { proto_tree_add_expert_format(tree, pinfo, &ei_kerberos_decrypted_keytype, cryptotvb, 0, 0, "Decrypted keytype %d usage %d in frame %u " "using %s (%02x%02x%02x%02x...)", ek->keytype, usage, pinfo->fd->num, ek->key_origin, ek->keyvalue[0] & 0xFF, ek->keyvalue[1] & 0xFF, ek->keyvalue[2] & 0xFF, ek->keyvalue[3] & 0xFF); } #endif /* HAVE_HEIMDAL_KERBEROS || HAVE_MIT_KERBEROS */ #if defined(HAVE_MIT_KERBEROS) #ifdef HAVE_KRB5_PAC_VERIFY static void used_signing_key(proto_tree *tree, packet_info *pinfo, enc_key_t *ek, tvbuff_t *tvb, krb5_cksumtype checksum, const char *reason) { proto_tree_add_expert_format(tree, pinfo, &ei_kerberos_decrypted_keytype, tvb, 0, 0, "%s checksum %d keytype %d in frame %u " "using %s (%02x%02x%02x%02x...)", reason, checksum, ek->keytype, pinfo->fd->num, ek->key_origin, ek->keyvalue[0] & 0xFF, ek->keyvalue[1] & 0xFF, ek->keyvalue[2] & 0xFF, ek->keyvalue[3] & 0xFF); } #endif /* HAVE_KRB5_PAC_VERIFY */ static krb5_context krb5_ctx; USES_APPLE_DEPRECATED_API void read_keytab_file(const char *filename) { krb5_keytab keytab; krb5_error_code ret; krb5_keytab_entry key; krb5_kt_cursor cursor; static gboolean first_time=TRUE; if (filename == NULL || filename[0] == 0) { return; } if(first_time){ first_time=FALSE; ret = krb5_init_context(&krb5_ctx); if(ret && ret != KRB5_CONFIG_CANTOPEN){ return; } } /* should use a file in the wireshark users dir */ ret = krb5_kt_resolve(krb5_ctx, filename, &keytab); if(ret){ fprintf(stderr, "KERBEROS ERROR: Badly formatted keytab filename :%s\n",filename); return; } ret = krb5_kt_start_seq_get(krb5_ctx, keytab, &cursor); if(ret){ fprintf(stderr, "KERBEROS ERROR: Could not open or could not read from keytab file :%s\n",filename); return; } do{ ret = krb5_kt_next_entry(krb5_ctx, keytab, &key, &cursor); if(ret==0){ enc_key_t *new_key; int i; char *pos; new_key = g_new(enc_key_t, 1); new_key->fd_num = -1; new_key->next = enc_key_list; /* generate origin string, describing where this key came from */ pos=new_key->key_origin; pos+=MIN(KRB_MAX_ORIG_LEN, g_snprintf(pos, KRB_MAX_ORIG_LEN, "keytab principal ")); for(i=0;ilength;i++){ pos+=MIN(KRB_MAX_ORIG_LEN-(pos-new_key->key_origin), g_snprintf(pos, (gulong)(KRB_MAX_ORIG_LEN-(pos-new_key->key_origin)), "%s%s",(i?"/":""),(key.principal->data[i]).data)); } pos+=MIN(KRB_MAX_ORIG_LEN-(pos-new_key->key_origin), g_snprintf(pos, (gulong)(KRB_MAX_ORIG_LEN-(pos-new_key->key_origin)), "@%s",key.principal->realm.data)); *pos=0; new_key->keytype=key.key.enctype; new_key->keylength=key.key.length; new_key->keyvalue=(char *)g_memdup(key.key.contents, key.key.length); enc_key_list=new_key; ret = krb5_free_keytab_entry_contents(krb5_ctx, &key); if (ret) { fprintf(stderr, "KERBEROS ERROR: Could not release the entry: %d", ret); ret = 0; /* try to continue with the next entry */ } } }while(ret==0); ret = krb5_kt_end_seq_get(krb5_ctx, keytab, &cursor); if(ret){ fprintf(stderr, "KERBEROS ERROR: Could not release the keytab cursor: %d", ret); } ret = krb5_kt_close(krb5_ctx, keytab); if(ret){ fprintf(stderr, "KERBEROS ERROR: Could not close the key table handle: %d", ret); } } static krb5_error_code decrypt_krb5_with_cb(proto_tree *tree, packet_info *pinfo, kerberos_private_data_t *private_data, int usage, int keytype, tvbuff_t *cryptotvb, krb5_error_code (*decrypt_cb_fn)( const krb5_keyblock *key, int usage, void *decrypt_cb_data), void *decrypt_cb_data) { krb5_error_code ret; enc_key_t *ek; krb5_keytab_entry key; read_keytab_file_from_preferences(); for(ek=enc_key_list;ek;ek=ek->next){ /* shortcircuit and bail out if enctypes are not matching */ if((keytype != -1) && (ek->keytype != keytype)) { continue; } key.key.enctype=ek->keytype; key.key.length=ek->keylength; key.key.contents=ek->keyvalue; ret = decrypt_cb_fn(&(key.key), usage, decrypt_cb_data); if(ret == 0) { used_encryption_key(tree, pinfo, private_data, ek, usage, cryptotvb); return 0; } } return -1; } struct decrypt_krb5_data_state { krb5_data input; krb5_data output; }; static krb5_error_code decrypt_krb5_data_cb(const krb5_keyblock *key, int usage, void *decrypt_cb_data) { struct decrypt_krb5_data_state *state = (struct decrypt_krb5_data_state *)decrypt_cb_data; krb5_enc_data input; memset(&input, 0, sizeof(input)); input.enctype = key->enctype; input.ciphertext = state->input; return krb5_c_decrypt(krb5_ctx, key, usage, 0, &input, &state->output); } static guint8 * decrypt_krb5_data_private(proto_tree *tree _U_, packet_info *pinfo, kerberos_private_data_t *private_data, int usage, tvbuff_t *cryptotvb, int keytype, int *datalen) { #define HAVE_DECRYPT_KRB5_DATA_PRIVATE 1 struct decrypt_krb5_data_state state; krb5_error_code ret; int length = tvb_captured_length(cryptotvb); const guint8 *cryptotext = tvb_get_ptr(cryptotvb, 0, length); /* don't do anything if we are not attempting to decrypt data */ if(!krb_decrypt || length < 1){ return NULL; } /* make sure we have all the data we need */ if (tvb_captured_length(cryptotvb) < tvb_reported_length(cryptotvb)) { return NULL; } memset(&state, 0, sizeof(state)); state.input.length = length; state.input.data = (guint8 *)cryptotext; state.output.data = (char *)wmem_alloc(pinfo->pool, length); state.output.length = length; ret = decrypt_krb5_with_cb(tree, pinfo, private_data, usage, keytype, cryptotvb, decrypt_krb5_data_cb, &state); if (ret != 0) { return NULL; } if (datalen) { *datalen = state.output.length; } return (guint8 *)state.output.data; } guint8 * decrypt_krb5_data(proto_tree *tree _U_, packet_info *pinfo, int usage, tvbuff_t *cryptotvb, int keytype, int *datalen) { kerberos_private_data_t zero_private = { .msg_type = 0, }; return decrypt_krb5_data_private(tree, pinfo, &zero_private, usage, cryptotvb, keytype, datalen); } USES_APPLE_RST #ifdef KRB5_CRYPTO_TYPE_SIGN_ONLY struct decrypt_krb5_krb_cfx_dce_state { const guint8 *gssapi_header_ptr; guint gssapi_header_len; tvbuff_t *gssapi_encrypted_tvb; guint8 *gssapi_payload; guint gssapi_payload_len; const guint8 *gssapi_trailer_ptr; guint gssapi_trailer_len; tvbuff_t *checksum_tvb; guint8 *checksum; guint checksum_len; }; static krb5_error_code decrypt_krb5_krb_cfx_dce_cb(const krb5_keyblock *key, int usage, void *decrypt_cb_data) { struct decrypt_krb5_krb_cfx_dce_state *state = (struct decrypt_krb5_krb_cfx_dce_state *)decrypt_cb_data; unsigned int k5_headerlen = 0; unsigned int k5_headerofs = 0; unsigned int k5_trailerlen = 0; unsigned int k5_trailerofs = 0; size_t _k5_blocksize = 0; guint k5_blocksize; krb5_crypto_iov iov[6]; krb5_error_code ret; guint checksum_remain = state->checksum_len; guint checksum_crypt_len; memset(iov, 0, sizeof(iov)); ret = krb5_c_crypto_length(krb5_ctx, key->enctype, KRB5_CRYPTO_TYPE_HEADER, &k5_headerlen); if (ret != 0) { return ret; } if (checksum_remain < k5_headerlen) { return -1; } checksum_remain -= k5_headerlen; k5_headerofs = checksum_remain; ret = krb5_c_crypto_length(krb5_ctx, key->enctype, KRB5_CRYPTO_TYPE_TRAILER, &k5_trailerlen); if (ret != 0) { return ret; } if (checksum_remain < k5_trailerlen) { return -1; } checksum_remain -= k5_trailerlen; k5_trailerofs = checksum_remain; checksum_crypt_len = checksum_remain; ret = krb5_c_block_size(krb5_ctx, key->enctype, &_k5_blocksize); if (ret != 0) { return ret; } /* * The cast is required for the Windows build in order * to avoid the following warning. * * warning C4267: '-=': conversion from 'size_t' to 'guint', * possible loss of data */ k5_blocksize = (guint)_k5_blocksize; if (checksum_remain < k5_blocksize) { return -1; } checksum_remain -= k5_blocksize; if (checksum_remain < 16) { return -1; } tvb_memcpy(state->gssapi_encrypted_tvb, state->gssapi_payload, 0, state->gssapi_payload_len); tvb_memcpy(state->checksum_tvb, state->checksum, 0, state->checksum_len); iov[0].flags = KRB5_CRYPTO_TYPE_HEADER; iov[0].data.data = state->checksum + k5_headerofs; iov[0].data.length = k5_headerlen; if (state->gssapi_header_ptr != NULL) { iov[1].flags = KRB5_CRYPTO_TYPE_SIGN_ONLY; iov[1].data.data = (guint8 *)(guintptr)state->gssapi_header_ptr; iov[1].data.length = state->gssapi_header_len; } else { iov[1].flags = KRB5_CRYPTO_TYPE_EMPTY; } iov[2].flags = KRB5_CRYPTO_TYPE_DATA; iov[2].data.data = state->gssapi_payload; iov[2].data.length = state->gssapi_payload_len; if (state->gssapi_trailer_ptr != NULL) { iov[3].flags = KRB5_CRYPTO_TYPE_SIGN_ONLY; iov[3].data.data = (guint8 *)(guintptr)state->gssapi_trailer_ptr; iov[3].data.length = state->gssapi_trailer_len; } else { iov[3].flags = KRB5_CRYPTO_TYPE_EMPTY; } iov[4].flags = KRB5_CRYPTO_TYPE_DATA; iov[4].data.data = state->checksum; iov[4].data.length = checksum_crypt_len; iov[5].flags = KRB5_CRYPTO_TYPE_TRAILER; iov[5].data.data = state->checksum + k5_trailerofs; iov[5].data.length = k5_trailerlen; return krb5_c_decrypt_iov(krb5_ctx, key, usage, 0, iov, 6); } tvbuff_t * decrypt_krb5_krb_cfx_dce(proto_tree *tree, packet_info *pinfo, int usage, int keytype, tvbuff_t *gssapi_header_tvb, tvbuff_t *gssapi_encrypted_tvb, tvbuff_t *gssapi_trailer_tvb, tvbuff_t *checksum_tvb) { struct decrypt_krb5_krb_cfx_dce_state state; kerberos_private_data_t zero_private = { .msg_type = 0, }; tvbuff_t *gssapi_decrypted_tvb = NULL; krb5_error_code ret; /* don't do anything if we are not attempting to decrypt data */ if (!krb_decrypt) { return NULL; } memset(&state, 0, sizeof(state)); /* make sure we have all the data we need */ #define __CHECK_TVB_LEN(__tvb) (tvb_captured_length(__tvb) < tvb_reported_length(__tvb)) if (gssapi_header_tvb != NULL) { if (__CHECK_TVB_LEN(gssapi_header_tvb)) { return NULL; } state.gssapi_header_len = tvb_captured_length(gssapi_header_tvb); state.gssapi_header_ptr = tvb_get_ptr(gssapi_header_tvb, 0, state.gssapi_header_len); } if (gssapi_encrypted_tvb == NULL || __CHECK_TVB_LEN(gssapi_encrypted_tvb)) { return NULL; } state.gssapi_encrypted_tvb = gssapi_encrypted_tvb; state.gssapi_payload_len = tvb_captured_length(gssapi_encrypted_tvb); state.gssapi_payload = (guint8 *)wmem_alloc0(pinfo->pool, state.gssapi_payload_len); if (state.gssapi_payload == NULL) { return NULL; } if (gssapi_trailer_tvb != NULL) { if (__CHECK_TVB_LEN(gssapi_trailer_tvb)) { return NULL; } state.gssapi_trailer_len = tvb_captured_length(gssapi_trailer_tvb); state.gssapi_trailer_ptr = tvb_get_ptr(gssapi_trailer_tvb, 0, state.gssapi_trailer_len); } if (checksum_tvb == NULL || __CHECK_TVB_LEN(checksum_tvb)) { return NULL; } state.checksum_tvb = checksum_tvb; state.checksum_len = tvb_captured_length(checksum_tvb); state.checksum = (guint8 *)wmem_alloc0(pinfo->pool, state.checksum_len); if (state.checksum == NULL) { return NULL; } ret = decrypt_krb5_with_cb(tree, pinfo, &zero_private, usage, keytype, gssapi_encrypted_tvb, decrypt_krb5_krb_cfx_dce_cb, &state); wmem_free(pinfo->pool, state.checksum); if (ret != 0) { wmem_free(pinfo->pool, state.gssapi_payload); return NULL; } gssapi_decrypted_tvb = tvb_new_child_real_data(gssapi_encrypted_tvb, state.gssapi_payload, state.gssapi_payload_len, state.gssapi_payload_len); if (gssapi_decrypted_tvb == NULL) { wmem_free(pinfo->pool, state.gssapi_payload); return NULL; } return gssapi_decrypted_tvb; } #else /* NOT KRB5_CRYPTO_TYPE_SIGN_ONLY */ #define NEED_DECRYPT_KRB5_KRB_CFX_DCE_NOOP 1 #endif /* NOT KRB5_CRYPTO_TYPE_SIGN_ONLY */ #ifdef HAVE_KRB5_PAC_VERIFY /* * macOS up to 10.14.5 only has a MIT shim layer on top * of heimdal. It means that krb5_pac_verify() is not available * in /usr/lib/libkrb5.dylib * * https://opensource.apple.com/tarballs/Heimdal/Heimdal-520.260.1.tar.gz * https://opensource.apple.com/tarballs/MITKerberosShim/MITKerberosShim-71.200.1.tar.gz */ extern krb5_error_code krb5int_c_mandatory_cksumtype(krb5_context, krb5_enctype, krb5_cksumtype *); static void verify_krb5_pac(proto_tree *tree _U_, asn1_ctx_t *actx, tvbuff_t *pactvb) { krb5_error_code ret; enc_key_t *ek = NULL;; krb5_data checksum_data = {0,0,NULL}; krb5_cksumtype server_checksum = 0; krb5_cksumtype kdc_checksum = 0; int length = tvb_captured_length(pactvb); const guint8 *pacbuffer = NULL; krb5_pac pac; /* don't do anything if we are not attempting to decrypt data */ if(!krb_decrypt || length < 1){ return; } /* make sure we have all the data we need */ if (tvb_captured_length(pactvb) < tvb_reported_length(pactvb)) { return; } pacbuffer = tvb_get_ptr(pactvb, 0, length); ret = krb5_pac_parse(krb5_ctx, pacbuffer, length, &pac); if (ret != 0) { proto_tree_add_expert_format(tree, actx->pinfo, &ei_kerberos_decrypted_keytype, pactvb, 0, 0, "Failed to parse PAC buffer %d in frame %u", ret, actx->pinfo->fd->num); return; } ret = krb5_pac_get_buffer(krb5_ctx, pac, KRB5_PAC_SERVER_CHECKSUM, &checksum_data); if (ret == 0) { server_checksum = pletoh32(checksum_data.data); krb5_free_data_contents(krb5_ctx, &checksum_data); }; ret = krb5_pac_get_buffer(krb5_ctx, pac, KRB5_PAC_PRIVSVR_CHECKSUM, &checksum_data); if (ret == 0) { kdc_checksum = pletoh32(checksum_data.data); krb5_free_data_contents(krb5_ctx, &checksum_data); }; read_keytab_file_from_preferences(); for(ek=enc_key_list;ek;ek=ek->next){ krb5_keyblock keyblock; krb5_cksumtype checksumtype = 0; if (server_checksum == 0 && kdc_checksum == 0) { break; } ret = krb5int_c_mandatory_cksumtype(krb5_ctx, ek->keytype, &checksumtype); if (ret != 0) { continue; } keyblock.magic = KV5M_KEYBLOCK; keyblock.enctype = ek->keytype; keyblock.length = ek->keylength; keyblock.contents = (guint8 *)ek->keyvalue; if (checksumtype == server_checksum) { ret = krb5_pac_verify(krb5_ctx, pac, 0, NULL, &keyblock, NULL); if (ret == 0) { used_signing_key(tree, actx->pinfo, ek, pactvb, server_checksum, "Verified Server"); server_checksum = 0; } } if (checksumtype == kdc_checksum) { ret = krb5_pac_verify(krb5_ctx, pac, 0, NULL, NULL, &keyblock); if (ret == 0) { used_signing_key(tree, actx->pinfo, ek, pactvb, kdc_checksum, "Verified KDC"); kdc_checksum = 0; } } } krb5_pac_free(krb5_ctx, pac); } #endif /* HAVE_KRB5_PAC_VERIFY */ #elif defined(HAVE_HEIMDAL_KERBEROS) static krb5_context krb5_ctx; USES_APPLE_DEPRECATED_API void read_keytab_file(const char *filename) { krb5_keytab keytab; krb5_error_code ret; krb5_keytab_entry key; krb5_kt_cursor cursor; enc_key_t *new_key; static gboolean first_time=TRUE; if (filename == NULL || filename[0] == 0) { return; } if(first_time){ first_time=FALSE; ret = krb5_init_context(&krb5_ctx); if(ret){ return; } } /* should use a file in the wireshark users dir */ ret = krb5_kt_resolve(krb5_ctx, filename, &keytab); if(ret){ fprintf(stderr, "KERBEROS ERROR: Could not open keytab file :%s\n",filename); return; } ret = krb5_kt_start_seq_get(krb5_ctx, keytab, &cursor); if(ret){ fprintf(stderr, "KERBEROS ERROR: Could not read from keytab file :%s\n",filename); return; } do{ ret = krb5_kt_next_entry(krb5_ctx, keytab, &key, &cursor); if(ret==0){ unsigned int i; char *pos; new_key = g_new0(enc_key_t, 1); new_key->fd_num = -1; new_key->next = enc_key_list; /* generate origin string, describing where this key came from */ pos=new_key->key_origin; pos+=MIN(KRB_MAX_ORIG_LEN, g_snprintf(pos, KRB_MAX_ORIG_LEN, "keytab principal ")); for(i=0;iname.name_string.len;i++){ pos+=MIN(KRB_MAX_ORIG_LEN-(pos-new_key->key_origin), g_snprintf(pos, KRB_MAX_ORIG_LEN-(pos-new_key->key_origin), "%s%s",(i?"/":""),key.principal->name.name_string.val[i])); } pos+=MIN(KRB_MAX_ORIG_LEN-(pos-new_key->key_origin), g_snprintf(pos, KRB_MAX_ORIG_LEN-(pos-new_key->key_origin), "@%s",key.principal->realm)); *pos=0; new_key->keytype=key.keyblock.keytype; new_key->keylength=(int)key.keyblock.keyvalue.length; new_key->keyvalue = (guint8 *)g_memdup(key.keyblock.keyvalue.data, (guint)key.keyblock.keyvalue.length); enc_key_list=new_key; ret = krb5_kt_free_entry(krb5_ctx, &key); if (ret) { fprintf(stderr, "KERBEROS ERROR: Could not release the entry: %d", ret); ret = 0; /* try to continue with the next entry */ } } }while(ret==0); ret = krb5_kt_end_seq_get(krb5_ctx, keytab, &cursor); if(ret){ fprintf(stderr, "KERBEROS ERROR: Could not release the keytab cursor: %d", ret); } ret = krb5_kt_close(krb5_ctx, keytab); if(ret){ fprintf(stderr, "KERBEROS ERROR: Could not close the key table handle: %d", ret); } } USES_APPLE_RST guint8 * decrypt_krb5_data(proto_tree *tree _U_, packet_info *pinfo, int usage, tvbuff_t *cryptotvb, int keytype, int *datalen) { kerberos_private_data_t zero_private = { .msg_type = 0, }; krb5_error_code ret; krb5_data data; enc_key_t *ek; int length = tvb_captured_length(cryptotvb); const guint8 *cryptotext = tvb_get_ptr(cryptotvb, 0, length); /* don't do anything if we are not attempting to decrypt data */ if(!krb_decrypt){ return NULL; } /* make sure we have all the data we need */ if (tvb_captured_length(cryptotvb) < tvb_reported_length(cryptotvb)) { return NULL; } read_keytab_file_from_preferences(); for(ek=enc_key_list;ek;ek=ek->next){ krb5_keytab_entry key; krb5_crypto crypto; guint8 *cryptocopy; /* workaround for pre-0.6.1 heimdal bug */ /* shortcircuit and bail out if enctypes are not matching */ if((keytype != -1) && (ek->keytype != keytype)) { continue; } key.keyblock.keytype=ek->keytype; key.keyblock.keyvalue.length=ek->keylength; key.keyblock.keyvalue.data=ek->keyvalue; ret = krb5_crypto_init(krb5_ctx, &(key.keyblock), (krb5_enctype)ENCTYPE_NULL, &crypto); if(ret){ return NULL; } /* pre-0.6.1 versions of Heimdal would sometimes change the cryptotext data even when the decryption failed. This would obviously not work since we iterate over the keys. So just give it a copy of the crypto data instead. This has been seen for RC4-HMAC blobs. */ cryptocopy = (guint8 *)wmem_memdup(wmem_packet_scope(), cryptotext, length); ret = krb5_decrypt_ivec(krb5_ctx, crypto, usage, cryptocopy, length, &data, NULL); if((ret == 0) && (length>0)){ char *user_data; used_encryption_key(tree, pinfo, &zero_private, ek, usage, cryptotvb); krb5_crypto_destroy(krb5_ctx, crypto); /* return a private wmem_alloced blob to the caller */ user_data = (char *)wmem_memdup(pinfo->pool, data.data, (guint)data.length); if (datalen) { *datalen = (int)data.length; } return user_data; } krb5_crypto_destroy(krb5_ctx, crypto); } return NULL; } #define NEED_DECRYPT_KRB5_KRB_CFX_DCE_NOOP 1 #elif defined (HAVE_LIBNETTLE) #define SERVICE_KEY_SIZE (DES3_KEY_SIZE + 2) #define KEYTYPE_DES3_CBC_MD5 5 /* Currently the only one supported */ typedef struct _service_key_t { guint16 kvno; int keytype; int length; guint8 *contents; char origin[KRB_MAX_ORIG_LEN+1]; } service_key_t; GSList *service_key_list = NULL; static void add_encryption_key(packet_info *pinfo, int keytype, int keylength, const char *keyvalue, const char *origin) { service_key_t *new_key; if(pinfo->fd->visited){ return; } new_key = g_malloc(sizeof(service_key_t)); new_key->kvno = 0; new_key->keytype = keytype; new_key->length = keylength; new_key->contents = g_memdup(keyvalue, keylength); g_snprintf(new_key->origin, KRB_MAX_ORIG_LEN, "%s learnt from frame %u", origin, pinfo->num); service_key_list = g_slist_append(service_key_list, (gpointer) new_key); } static void clear_keytab(void) { GSList *ske; service_key_t *sk; for(ske = service_key_list; ske != NULL; ske = g_slist_next(ske)){ sk = (service_key_t *) ske->data; if (sk) { g_free(sk->contents); g_free(sk); } } g_slist_free(service_key_list); service_key_list = NULL; } static void read_keytab_file(const char *service_key_file) { FILE *skf; ws_statb64 st; service_key_t *sk; unsigned char buf[SERVICE_KEY_SIZE]; int newline_skip = 0, count = 0; if (service_key_file != NULL && ws_stat64 (service_key_file, &st) == 0) { /* The service key file contains raw 192-bit (24 byte) 3DES keys. * There can be zero, one (\n), or two (\r\n) characters between * keys. Trailing characters are ignored. */ /* XXX We should support the standard keytab format instead */ if (st.st_size > SERVICE_KEY_SIZE) { if ( (st.st_size % (SERVICE_KEY_SIZE + 1) == 0) || (st.st_size % (SERVICE_KEY_SIZE + 1) == SERVICE_KEY_SIZE) ) { newline_skip = 1; } else if ( (st.st_size % (SERVICE_KEY_SIZE + 2) == 0) || (st.st_size % (SERVICE_KEY_SIZE + 2) == SERVICE_KEY_SIZE) ) { newline_skip = 2; } } skf = ws_fopen(service_key_file, "rb"); if (! skf) return; while (fread(buf, SERVICE_KEY_SIZE, 1, skf) == 1) { sk = g_malloc(sizeof(service_key_t)); sk->kvno = buf[0] << 8 | buf[1]; sk->keytype = KEYTYPE_DES3_CBC_MD5; sk->length = DES3_KEY_SIZE; sk->contents = g_memdup(buf + 2, DES3_KEY_SIZE); g_snprintf(sk->origin, KRB_MAX_ORIG_LEN, "3DES service key file, key #%d, offset %ld", count, ftell(skf)); service_key_list = g_slist_append(service_key_list, (gpointer) sk); if (fseek(skf, newline_skip, SEEK_CUR) < 0) { fprintf(stderr, "unable to seek...\n"); return; } count++; } fclose(skf); } } #define CONFOUNDER_PLUS_CHECKSUM 24 guint8 * decrypt_krb5_data(proto_tree *tree, packet_info *pinfo, int _U_ usage, tvbuff_t *cryptotvb, int keytype, int *datalen) { tvbuff_t *encr_tvb; guint8 *decrypted_data = NULL, *plaintext = NULL; guint8 cls; gboolean pc; guint32 tag, item_len, data_len; int id_offset, offset; guint8 key[DES3_KEY_SIZE]; guint8 initial_vector[DES_BLOCK_SIZE]; gcry_md_hd_t md5_handle; guint8 *digest; guint8 zero_fill[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; guint8 confounder[8]; gboolean ind; GSList *ske; service_key_t *sk; struct des3_ctx ctx; int length = tvb_captured_length(cryptotvb); const guint8 *cryptotext = tvb_get_ptr(cryptotvb, 0, length); /* don't do anything if we are not attempting to decrypt data */ if(!krb_decrypt){ return NULL; } /* make sure we have all the data we need */ if (tvb_captured_length(cryptotvb) < tvb_reported_length(cryptotvb)) { return NULL; } if (keytype != KEYTYPE_DES3_CBC_MD5 || service_key_list == NULL) { return NULL; } decrypted_data = wmem_alloc(wmem_packet_scope(), length); for(ske = service_key_list; ske != NULL; ske = g_slist_next(ske)){ gboolean do_continue = FALSE; gboolean digest_ok; sk = (service_key_t *) ske->data; des_fix_parity(DES3_KEY_SIZE, key, sk->contents); memset(initial_vector, 0, DES_BLOCK_SIZE); des3_set_key(&ctx, key); cbc_decrypt(&ctx, des3_decrypt, DES_BLOCK_SIZE, initial_vector, length, decrypted_data, cryptotext); encr_tvb = tvb_new_real_data(decrypted_data, length, length); tvb_memcpy(encr_tvb, confounder, 0, 8); /* We have to pull the decrypted data length from the decrypted * content. If the key doesn't match or we otherwise get garbage, * an exception may get thrown while decoding the ASN.1 header. * Catch it, just in case. */ TRY { id_offset = get_ber_identifier(encr_tvb, CONFOUNDER_PLUS_CHECKSUM, &cls, &pc, &tag); offset = get_ber_length(encr_tvb, id_offset, &item_len, &ind); } CATCH_BOUNDS_ERRORS { tvb_free(encr_tvb); do_continue = TRUE; } ENDTRY; if (do_continue) continue; data_len = item_len + offset - CONFOUNDER_PLUS_CHECKSUM; if ((int) item_len + offset > length) { tvb_free(encr_tvb); continue; } if (gcry_md_open(&md5_handle, GCRY_MD_MD5, 0)) { return NULL; } gcry_md_write(md5_handle, confounder, 8); gcry_md_write(md5_handle, zero_fill, 16); gcry_md_write(md5_handle, decrypted_data + CONFOUNDER_PLUS_CHECKSUM, data_len); digest = gcry_md_read(md5_handle, 0); digest_ok = (tvb_memeql (encr_tvb, 8, digest, HASH_MD5_LENGTH) == 0); gcry_md_close(md5_handle); if (digest_ok) { plaintext = (guint8* )tvb_memdup(pinfo->pool, encr_tvb, CONFOUNDER_PLUS_CHECKSUM, data_len); tvb_free(encr_tvb); if (datalen) { *datalen = data_len; } return(plaintext); } tvb_free(encr_tvb); } return NULL; } #endif /* HAVE_MIT_KERBEROS / HAVE_HEIMDAL_KERBEROS / HAVE_LIBNETTLE */ #ifdef NEED_DECRYPT_KRB5_KRB_CFX_DCE_NOOP tvbuff_t * decrypt_krb5_krb_cfx_dce(proto_tree *tree _U_, packet_info *pinfo _U_, int usage _U_, int keytype _U_, tvbuff_t *gssapi_header_tvb _U_, tvbuff_t *gssapi_encrypted_tvb _U_, tvbuff_t *gssapi_trailer_tvb _U_, tvbuff_t *checksum_tvb _U_) { return NULL; } #endif /* NEED_DECRYPT_KRB5_KRB_CFX_DCE_NOOP */ #define INET6_ADDRLEN 16 /* TCP Record Mark */ #define KRB_RM_RESERVED 0x80000000U #define KRB_RM_RECLEN 0x7fffffffU #define KRB5_MSG_TICKET 1 /* Ticket */ #define KRB5_MSG_AUTHENTICATOR 2 /* Authenticator */ #define KRB5_MSG_ENC_TICKET_PART 3 /* EncTicketPart */ #define KRB5_MSG_AS_REQ 10 /* AS-REQ type */ #define KRB5_MSG_AS_REP 11 /* AS-REP type */ #define KRB5_MSG_TGS_REQ 12 /* TGS-REQ type */ #define KRB5_MSG_TGS_REP 13 /* TGS-REP type */ #define KRB5_MSG_AP_REQ 14 /* AP-REQ type */ #define KRB5_MSG_AP_REP 15 /* AP-REP type */ #define KRB5_MSG_SAFE 20 /* KRB-SAFE type */ #define KRB5_MSG_PRIV 21 /* KRB-PRIV type */ #define KRB5_MSG_CRED 22 /* KRB-CRED type */ #define KRB5_MSG_ENC_AS_REP_PART 25 /* EncASRepPart */ #define KRB5_MSG_ENC_TGS_REP_PART 26 /* EncTGSRepPart */ #define KRB5_MSG_ENC_AP_REP_PART 27 /* EncAPRepPart */ #define KRB5_MSG_ENC_KRB_PRIV_PART 28 /* EncKrbPrivPart */ #define KRB5_MSG_ENC_KRB_CRED_PART 29 /* EncKrbCredPart */ #define KRB5_MSG_ERROR 30 /* KRB-ERROR type */ #define KRB5_CHKSUM_GSSAPI 0x8003 /* * For KERB_ENCTYPE_RC4_HMAC and KERB_ENCTYPE_RC4_HMAC_EXP, see * * https://tools.ietf.org/html/draft-brezak-win2k-krb-rc4-hmac-04 * * unless it's expired. */ /* Principal name-type */ #define KRB5_NT_UNKNOWN 0 #define KRB5_NT_PRINCIPAL 1 #define KRB5_NT_SRV_INST 2 #define KRB5_NT_SRV_HST 3 #define KRB5_NT_SRV_XHST 4 #define KRB5_NT_UID 5 #define KRB5_NT_X500_PRINCIPAL 6 #define KRB5_NT_SMTP_NAME 7 #define KRB5_NT_ENTERPRISE 10 /* * MS specific name types, from * * http://msdn.microsoft.com/library/en-us/security/security/kerb_external_name.asp */ #define KRB5_NT_MS_PRINCIPAL -128 #define KRB5_NT_MS_PRINCIPAL_AND_SID -129 #define KRB5_NT_ENT_PRINCIPAL_AND_SID -130 #define KRB5_NT_PRINCIPAL_AND_SID -131 #define KRB5_NT_SRV_INST_AND_SID -132 /* error table constants */ /* I prefixed the krb5_err.et constant names with KRB5_ET_ for these */ #define KRB5_ET_KRB5KDC_ERR_NONE 0 #define KRB5_ET_KRB5KDC_ERR_NAME_EXP 1 #define KRB5_ET_KRB5KDC_ERR_SERVICE_EXP 2 #define KRB5_ET_KRB5KDC_ERR_BAD_PVNO 3 #define KRB5_ET_KRB5KDC_ERR_C_OLD_MAST_KVNO 4 #define KRB5_ET_KRB5KDC_ERR_S_OLD_MAST_KVNO 5 #define KRB5_ET_KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN 6 #define KRB5_ET_KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN 7 #define KRB5_ET_KRB5KDC_ERR_PRINCIPAL_NOT_UNIQUE 8 #define KRB5_ET_KRB5KDC_ERR_NULL_KEY 9 #define KRB5_ET_KRB5KDC_ERR_CANNOT_POSTDATE 10 #define KRB5_ET_KRB5KDC_ERR_NEVER_VALID 11 #define KRB5_ET_KRB5KDC_ERR_POLICY 12 #define KRB5_ET_KRB5KDC_ERR_BADOPTION 13 #define KRB5_ET_KRB5KDC_ERR_ETYPE_NOSUPP 14 #define KRB5_ET_KRB5KDC_ERR_SUMTYPE_NOSUPP 15 #define KRB5_ET_KRB5KDC_ERR_PADATA_TYPE_NOSUPP 16 #define KRB5_ET_KRB5KDC_ERR_TRTYPE_NOSUPP 17 #define KRB5_ET_KRB5KDC_ERR_CLIENT_REVOKED 18 #define KRB5_ET_KRB5KDC_ERR_SERVICE_REVOKED 19 #define KRB5_ET_KRB5KDC_ERR_TGT_REVOKED 20 #define KRB5_ET_KRB5KDC_ERR_CLIENT_NOTYET 21 #define KRB5_ET_KRB5KDC_ERR_SERVICE_NOTYET 22 #define KRB5_ET_KRB5KDC_ERR_KEY_EXP 23 #define KRB5_ET_KRB5KDC_ERR_PREAUTH_FAILED 24 #define KRB5_ET_KRB5KDC_ERR_PREAUTH_REQUIRED 25 #define KRB5_ET_KRB5KDC_ERR_SERVER_NOMATCH 26 #define KRB5_ET_KRB5KDC_ERR_MUST_USE_USER2USER 27 #define KRB5_ET_KRB5KDC_ERR_PATH_NOT_ACCEPTED 28 #define KRB5_ET_KRB5KDC_ERR_SVC_UNAVAILABLE 29 #define KRB5_ET_KRB5KRB_AP_ERR_BAD_INTEGRITY 31 #define KRB5_ET_KRB5KRB_AP_ERR_TKT_EXPIRED 32 #define KRB5_ET_KRB5KRB_AP_ERR_TKT_NYV 33 #define KRB5_ET_KRB5KRB_AP_ERR_REPEAT 34 #define KRB5_ET_KRB5KRB_AP_ERR_NOT_US 35 #define KRB5_ET_KRB5KRB_AP_ERR_BADMATCH 36 #define KRB5_ET_KRB5KRB_AP_ERR_SKEW 37 #define KRB5_ET_KRB5KRB_AP_ERR_BADADDR 38 #define KRB5_ET_KRB5KRB_AP_ERR_BADVERSION 39 #define KRB5_ET_KRB5KRB_AP_ERR_MSG_TYPE 40 #define KRB5_ET_KRB5KRB_AP_ERR_MODIFIED 41 #define KRB5_ET_KRB5KRB_AP_ERR_BADORDER 42 #define KRB5_ET_KRB5KRB_AP_ERR_ILL_CR_TKT 43 #define KRB5_ET_KRB5KRB_AP_ERR_BADKEYVER 44 #define KRB5_ET_KRB5KRB_AP_ERR_NOKEY 45 #define KRB5_ET_KRB5KRB_AP_ERR_MUT_FAIL 46 #define KRB5_ET_KRB5KRB_AP_ERR_BADDIRECTION 47 #define KRB5_ET_KRB5KRB_AP_ERR_METHOD 48 #define KRB5_ET_KRB5KRB_AP_ERR_BADSEQ 49 #define KRB5_ET_KRB5KRB_AP_ERR_INAPP_CKSUM 50 #define KRB5_ET_KRB5KDC_AP_PATH_NOT_ACCEPTED 51 #define KRB5_ET_KRB5KRB_ERR_RESPONSE_TOO_BIG 52 #define KRB5_ET_KRB5KRB_ERR_GENERIC 60 #define KRB5_ET_KRB5KRB_ERR_FIELD_TOOLONG 61 #define KRB5_ET_KDC_ERROR_CLIENT_NOT_TRUSTED 62 #define KRB5_ET_KDC_ERROR_KDC_NOT_TRUSTED 63 #define KRB5_ET_KDC_ERROR_INVALID_SIG 64 #define KRB5_ET_KDC_ERR_KEY_TOO_WEAK 65 #define KRB5_ET_KDC_ERR_CERTIFICATE_MISMATCH 66 #define KRB5_ET_KRB_AP_ERR_NO_TGT 67 #define KRB5_ET_KDC_ERR_WRONG_REALM 68 #define KRB5_ET_KRB_AP_ERR_USER_TO_USER_REQUIRED 69 #define KRB5_ET_KDC_ERR_CANT_VERIFY_CERTIFICATE 70 #define KRB5_ET_KDC_ERR_INVALID_CERTIFICATE 71 #define KRB5_ET_KDC_ERR_REVOKED_CERTIFICATE 72 #define KRB5_ET_KDC_ERR_REVOCATION_STATUS_UNKNOWN 73 #define KRB5_ET_KDC_ERR_REVOCATION_STATUS_UNAVAILABLE 74 #define KRB5_ET_KDC_ERR_CLIENT_NAME_MISMATCH 75 #define KRB5_ET_KDC_ERR_KDC_NAME_MISMATCH 76 #define KRB5_ET_KDC_ERR_PREAUTH_EXPIRED 90 #define KRB5_ET_KDC_ERR_MORE_PREAUTH_DATA_REQUIRED 91 #define KRB5_ET_KDC_ERR_PREAUTH_BAD_AUTHENTICATION_SET 92 #define KRB5_ET_KDC_ERR_UNKNOWN_CRITICAL_FAST_OPTIONS 93 static const value_string krb5_error_codes[] = { { KRB5_ET_KRB5KDC_ERR_NONE, "KRB5KDC_ERR_NONE" }, { KRB5_ET_KRB5KDC_ERR_NAME_EXP, "KRB5KDC_ERR_NAME_EXP" }, { KRB5_ET_KRB5KDC_ERR_SERVICE_EXP, "KRB5KDC_ERR_SERVICE_EXP" }, { KRB5_ET_KRB5KDC_ERR_BAD_PVNO, "KRB5KDC_ERR_BAD_PVNO" }, { KRB5_ET_KRB5KDC_ERR_C_OLD_MAST_KVNO, "KRB5KDC_ERR_C_OLD_MAST_KVNO" }, { KRB5_ET_KRB5KDC_ERR_S_OLD_MAST_KVNO, "KRB5KDC_ERR_S_OLD_MAST_KVNO" }, { KRB5_ET_KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN, "KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN" }, { KRB5_ET_KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN, "KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN" }, { KRB5_ET_KRB5KDC_ERR_PRINCIPAL_NOT_UNIQUE, "KRB5KDC_ERR_PRINCIPAL_NOT_UNIQUE" }, { KRB5_ET_KRB5KDC_ERR_NULL_KEY, "KRB5KDC_ERR_NULL_KEY" }, { KRB5_ET_KRB5KDC_ERR_CANNOT_POSTDATE, "KRB5KDC_ERR_CANNOT_POSTDATE" }, { KRB5_ET_KRB5KDC_ERR_NEVER_VALID, "KRB5KDC_ERR_NEVER_VALID" }, { KRB5_ET_KRB5KDC_ERR_POLICY, "KRB5KDC_ERR_POLICY" }, { KRB5_ET_KRB5KDC_ERR_BADOPTION, "KRB5KDC_ERR_BADOPTION" }, { KRB5_ET_KRB5KDC_ERR_ETYPE_NOSUPP, "KRB5KDC_ERR_ETYPE_NOSUPP" }, { KRB5_ET_KRB5KDC_ERR_SUMTYPE_NOSUPP, "KRB5KDC_ERR_SUMTYPE_NOSUPP" }, { KRB5_ET_KRB5KDC_ERR_PADATA_TYPE_NOSUPP, "KRB5KDC_ERR_PADATA_TYPE_NOSUPP" }, { KRB5_ET_KRB5KDC_ERR_TRTYPE_NOSUPP, "KRB5KDC_ERR_TRTYPE_NOSUPP" }, { KRB5_ET_KRB5KDC_ERR_CLIENT_REVOKED, "KRB5KDC_ERR_CLIENT_REVOKED" }, { KRB5_ET_KRB5KDC_ERR_SERVICE_REVOKED, "KRB5KDC_ERR_SERVICE_REVOKED" }, { KRB5_ET_KRB5KDC_ERR_TGT_REVOKED, "KRB5KDC_ERR_TGT_REVOKED" }, { KRB5_ET_KRB5KDC_ERR_CLIENT_NOTYET, "KRB5KDC_ERR_CLIENT_NOTYET" }, { KRB5_ET_KRB5KDC_ERR_SERVICE_NOTYET, "KRB5KDC_ERR_SERVICE_NOTYET" }, { KRB5_ET_KRB5KDC_ERR_KEY_EXP, "KRB5KDC_ERR_KEY_EXP" }, { KRB5_ET_KRB5KDC_ERR_PREAUTH_FAILED, "KRB5KDC_ERR_PREAUTH_FAILED" }, { KRB5_ET_KRB5KDC_ERR_PREAUTH_REQUIRED, "KRB5KDC_ERR_PREAUTH_REQUIRED" }, { KRB5_ET_KRB5KDC_ERR_SERVER_NOMATCH, "KRB5KDC_ERR_SERVER_NOMATCH" }, { KRB5_ET_KRB5KDC_ERR_MUST_USE_USER2USER, "KRB5KDC_ERR_MUST_USE_USER2USER" }, { KRB5_ET_KRB5KDC_ERR_PATH_NOT_ACCEPTED, "KRB5KDC_ERR_PATH_NOT_ACCEPTED" }, { KRB5_ET_KRB5KDC_ERR_SVC_UNAVAILABLE, "KRB5KDC_ERR_SVC_UNAVAILABLE" }, { KRB5_ET_KRB5KRB_AP_ERR_BAD_INTEGRITY, "KRB5KRB_AP_ERR_BAD_INTEGRITY" }, { KRB5_ET_KRB5KRB_AP_ERR_TKT_EXPIRED, "KRB5KRB_AP_ERR_TKT_EXPIRED" }, { KRB5_ET_KRB5KRB_AP_ERR_TKT_NYV, "KRB5KRB_AP_ERR_TKT_NYV" }, { KRB5_ET_KRB5KRB_AP_ERR_REPEAT, "KRB5KRB_AP_ERR_REPEAT" }, { KRB5_ET_KRB5KRB_AP_ERR_NOT_US, "KRB5KRB_AP_ERR_NOT_US" }, { KRB5_ET_KRB5KRB_AP_ERR_BADMATCH, "KRB5KRB_AP_ERR_BADMATCH" }, { KRB5_ET_KRB5KRB_AP_ERR_SKEW, "KRB5KRB_AP_ERR_SKEW" }, { KRB5_ET_KRB5KRB_AP_ERR_BADADDR, "KRB5KRB_AP_ERR_BADADDR" }, { KRB5_ET_KRB5KRB_AP_ERR_BADVERSION, "KRB5KRB_AP_ERR_BADVERSION" }, { KRB5_ET_KRB5KRB_AP_ERR_MSG_TYPE, "KRB5KRB_AP_ERR_MSG_TYPE" }, { KRB5_ET_KRB5KRB_AP_ERR_MODIFIED, "KRB5KRB_AP_ERR_MODIFIED" }, { KRB5_ET_KRB5KRB_AP_ERR_BADORDER, "KRB5KRB_AP_ERR_BADORDER" }, { KRB5_ET_KRB5KRB_AP_ERR_ILL_CR_TKT, "KRB5KRB_AP_ERR_ILL_CR_TKT" }, { KRB5_ET_KRB5KRB_AP_ERR_BADKEYVER, "KRB5KRB_AP_ERR_BADKEYVER" }, { KRB5_ET_KRB5KRB_AP_ERR_NOKEY, "KRB5KRB_AP_ERR_NOKEY" }, { KRB5_ET_KRB5KRB_AP_ERR_MUT_FAIL, "KRB5KRB_AP_ERR_MUT_FAIL" }, { KRB5_ET_KRB5KRB_AP_ERR_BADDIRECTION, "KRB5KRB_AP_ERR_BADDIRECTION" }, { KRB5_ET_KRB5KRB_AP_ERR_METHOD, "KRB5KRB_AP_ERR_METHOD" }, { KRB5_ET_KRB5KRB_AP_ERR_BADSEQ, "KRB5KRB_AP_ERR_BADSEQ" }, { KRB5_ET_KRB5KRB_AP_ERR_INAPP_CKSUM, "KRB5KRB_AP_ERR_INAPP_CKSUM" }, { KRB5_ET_KRB5KDC_AP_PATH_NOT_ACCEPTED, "KRB5KDC_AP_PATH_NOT_ACCEPTED" }, { KRB5_ET_KRB5KRB_ERR_RESPONSE_TOO_BIG, "KRB5KRB_ERR_RESPONSE_TOO_BIG"}, { KRB5_ET_KRB5KRB_ERR_GENERIC, "KRB5KRB_ERR_GENERIC" }, { KRB5_ET_KRB5KRB_ERR_FIELD_TOOLONG, "KRB5KRB_ERR_FIELD_TOOLONG" }, { KRB5_ET_KDC_ERROR_CLIENT_NOT_TRUSTED, "KDC_ERROR_CLIENT_NOT_TRUSTED" }, { KRB5_ET_KDC_ERROR_KDC_NOT_TRUSTED, "KDC_ERROR_KDC_NOT_TRUSTED" }, { KRB5_ET_KDC_ERROR_INVALID_SIG, "KDC_ERROR_INVALID_SIG" }, { KRB5_ET_KDC_ERR_KEY_TOO_WEAK, "KDC_ERR_KEY_TOO_WEAK" }, { KRB5_ET_KDC_ERR_CERTIFICATE_MISMATCH, "KDC_ERR_CERTIFICATE_MISMATCH" }, { KRB5_ET_KRB_AP_ERR_NO_TGT, "KRB_AP_ERR_NO_TGT" }, { KRB5_ET_KDC_ERR_WRONG_REALM, "KDC_ERR_WRONG_REALM" }, { KRB5_ET_KRB_AP_ERR_USER_TO_USER_REQUIRED, "KRB_AP_ERR_USER_TO_USER_REQUIRED" }, { KRB5_ET_KDC_ERR_CANT_VERIFY_CERTIFICATE, "KDC_ERR_CANT_VERIFY_CERTIFICATE" }, { KRB5_ET_KDC_ERR_INVALID_CERTIFICATE, "KDC_ERR_INVALID_CERTIFICATE" }, { KRB5_ET_KDC_ERR_REVOKED_CERTIFICATE, "KDC_ERR_REVOKED_CERTIFICATE" }, { KRB5_ET_KDC_ERR_REVOCATION_STATUS_UNKNOWN, "KDC_ERR_REVOCATION_STATUS_UNKNOWN" }, { KRB5_ET_KDC_ERR_REVOCATION_STATUS_UNAVAILABLE, "KDC_ERR_REVOCATION_STATUS_UNAVAILABLE" }, { KRB5_ET_KDC_ERR_CLIENT_NAME_MISMATCH, "KDC_ERR_CLIENT_NAME_MISMATCH" }, { KRB5_ET_KDC_ERR_KDC_NAME_MISMATCH, "KDC_ERR_KDC_NAME_MISMATCH" }, { KRB5_ET_KDC_ERR_PREAUTH_EXPIRED, "KDC_ERR_PREAUTH_EXPIRED" }, { KRB5_ET_KDC_ERR_MORE_PREAUTH_DATA_REQUIRED, "KDC_ERR_MORE_PREAUTH_DATA_REQUIRED" }, { KRB5_ET_KDC_ERR_PREAUTH_BAD_AUTHENTICATION_SET, "KDC_ERR_PREAUTH_BAD_AUTHENTICATION_SET" }, { KRB5_ET_KDC_ERR_UNKNOWN_CRITICAL_FAST_OPTIONS, "KDC_ERR_UNKNOWN_CRITICAL_FAST_OPTIONS" }, { 0, NULL } }; #define PAC_LOGON_INFO 1 #define PAC_CREDENTIAL_TYPE 2 #define PAC_SERVER_CHECKSUM 6 #define PAC_PRIVSVR_CHECKSUM 7 #define PAC_CLIENT_INFO_TYPE 10 #define PAC_S4U_DELEGATION_INFO 11 #define PAC_UPN_DNS_INFO 12 #define PAC_CLIENT_CLAIMS_INFO 13 #define PAC_DEVICE_INFO 14 #define PAC_DEVICE_CLAIMS_INFO 15 static const value_string w2k_pac_types[] = { { PAC_LOGON_INFO , "Logon Info" }, { PAC_CREDENTIAL_TYPE , "Credential Type" }, { PAC_SERVER_CHECKSUM , "Server Checksum" }, { PAC_PRIVSVR_CHECKSUM , "Privsvr Checksum" }, { PAC_CLIENT_INFO_TYPE , "Client Info Type" }, { PAC_S4U_DELEGATION_INFO , "S4U Delegation Info" }, { PAC_UPN_DNS_INFO , "UPN DNS Info" }, { PAC_CLIENT_CLAIMS_INFO , "Client Claims Info" }, { PAC_DEVICE_INFO , "Device Info" }, { PAC_DEVICE_CLAIMS_INFO , "Device Claims Info" }, { 0, NULL }, }; static const value_string krb5_msg_types[] = { { KRB5_MSG_TICKET, "Ticket" }, { KRB5_MSG_AUTHENTICATOR, "Authenticator" }, { KRB5_MSG_ENC_TICKET_PART, "EncTicketPart" }, { KRB5_MSG_TGS_REQ, "TGS-REQ" }, { KRB5_MSG_TGS_REP, "TGS-REP" }, { KRB5_MSG_AS_REQ, "AS-REQ" }, { KRB5_MSG_AS_REP, "AS-REP" }, { KRB5_MSG_AP_REQ, "AP-REQ" }, { KRB5_MSG_AP_REP, "AP-REP" }, { KRB5_MSG_SAFE, "KRB-SAFE" }, { KRB5_MSG_PRIV, "KRB-PRIV" }, { KRB5_MSG_CRED, "KRB-CRED" }, { KRB5_MSG_ENC_AS_REP_PART, "EncASRepPart" }, { KRB5_MSG_ENC_TGS_REP_PART, "EncTGSRepPart" }, { KRB5_MSG_ENC_AP_REP_PART, "EncAPRepPart" }, { KRB5_MSG_ENC_KRB_PRIV_PART, "EncKrbPrivPart" }, { KRB5_MSG_ENC_KRB_CRED_PART, "EncKrbCredPart" }, { KRB5_MSG_ERROR, "KRB-ERROR" }, { 0, NULL }, }; #define KRB5_GSS_C_DELEG_FLAG 0x01 #define KRB5_GSS_C_MUTUAL_FLAG 0x02 #define KRB5_GSS_C_REPLAY_FLAG 0x04 #define KRB5_GSS_C_SEQUENCE_FLAG 0x08 #define KRB5_GSS_C_CONF_FLAG 0x10 #define KRB5_GSS_C_INTEG_FLAG 0x20 #define KRB5_GSS_C_DCE_STYLE 0x1000 static const true_false_string tfs_gss_flags_deleg = { "Delegate credentials to remote peer", "Do NOT delegate" }; static const true_false_string tfs_gss_flags_mutual = { "Request that remote peer authenticates itself", "Mutual authentication NOT required" }; static const true_false_string tfs_gss_flags_replay = { "Enable replay protection for signed or sealed messages", "Do NOT enable replay protection" }; static const true_false_string tfs_gss_flags_sequence = { "Enable Out-of-sequence detection for sign or sealed messages", "Do NOT enable out-of-sequence detection" }; static const true_false_string tfs_gss_flags_conf = { "Confidentiality (sealing) may be invoked", "Do NOT use Confidentiality (sealing)" }; static const true_false_string tfs_gss_flags_integ = { "Integrity protection (signing) may be invoked", "Do NOT use integrity protection" }; static const true_false_string tfs_gss_flags_dce_style = { "DCE-STYLE", "Not using DCE-STYLE" }; #ifdef HAVE_KERBEROS static guint8 * decrypt_krb5_data_asn1(proto_tree *tree, asn1_ctx_t *actx, int usage, tvbuff_t *cryptotvb, int *datalen) { kerberos_private_data_t *private_data = kerberos_get_private_data(actx); #ifdef HAVE_DECRYPT_KRB5_DATA_PRIVATE return decrypt_krb5_data_private(tree, actx->pinfo, private_data, usage, cryptotvb, private_data->etype, datalen); #else return decrypt_krb5_data(tree, actx->pinfo, usage, cryptotvb, private_data->etype, datalen); #endif } static int dissect_krb5_decrypt_ticket_data (gboolean imp_tag _U_, tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_) { guint8 *plaintext; int length; tvbuff_t *next_tvb; next_tvb=tvb_new_subset_remaining(tvb, offset); length=tvb_captured_length_remaining(tvb, offset); /* draft-ietf-krb-wg-kerberos-clarifications-05.txt : * 7.5.1 * All Ticket encrypted parts use usage == 2 */ plaintext=decrypt_krb5_data_asn1(tree, actx, 2, next_tvb, NULL); if(plaintext){ tvbuff_t *child_tvb; child_tvb = tvb_new_child_real_data(tvb, plaintext, length, length); /* Add the decrypted data to the data source list. */ add_new_data_source(actx->pinfo, child_tvb, "Decrypted Krb5"); offset=dissect_kerberos_Applications(FALSE, child_tvb, 0, actx , tree, /* hf_index*/ -1); } return offset; } static int dissect_krb5_decrypt_authenticator_data (gboolean imp_tag _U_, tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_) { guint8 *plaintext; int length; tvbuff_t *next_tvb; next_tvb=tvb_new_subset_remaining(tvb, offset); length=tvb_captured_length_remaining(tvb, offset); /* draft-ietf-krb-wg-kerberos-clarifications-05.txt : * 7.5.1 * Authenticators are encrypted with usage * == 7 or * == 11 */ plaintext=decrypt_krb5_data_asn1(tree, actx, 7, next_tvb, NULL); if(!plaintext){ plaintext=decrypt_krb5_data_asn1(tree, actx, 11, next_tvb, NULL); } if(plaintext){ tvbuff_t *child_tvb; child_tvb = tvb_new_child_real_data(tvb, plaintext, length, length); /* Add the decrypted data to the data source list. */ add_new_data_source(actx->pinfo, child_tvb, "Decrypted Krb5"); offset=dissect_kerberos_Applications(FALSE, child_tvb, 0, actx , tree, /* hf_index*/ -1); } return offset; } static int dissect_krb5_decrypt_authorization_data(gboolean imp_tag _U_, tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_) { guint8 *plaintext; int length; tvbuff_t *next_tvb; next_tvb=tvb_new_subset_remaining(tvb, offset); length=tvb_captured_length_remaining(tvb, offset); /* draft-ietf-krb-wg-kerberos-clarifications-05.txt : * 7.5.1 * Authenticators are encrypted with usage * == 5 or * == 4 */ plaintext=decrypt_krb5_data_asn1(tree, actx, 5, next_tvb, NULL); if(!plaintext){ plaintext=decrypt_krb5_data_asn1(tree, actx, 4, next_tvb, NULL); } if(plaintext){ tvbuff_t *child_tvb; child_tvb = tvb_new_child_real_data(tvb, plaintext, length, length); /* Add the decrypted data to the data source list. */ add_new_data_source(actx->pinfo, child_tvb, "Decrypted Krb5"); offset=dissect_kerberos_AuthorizationData(FALSE, child_tvb, 0, actx , tree, /* hf_index*/ -1); } return offset; } static int dissect_krb5_decrypt_KDC_REP_data (gboolean imp_tag _U_, tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_) { guint8 *plaintext; int length; tvbuff_t *next_tvb; next_tvb=tvb_new_subset_remaining(tvb, offset); length=tvb_captured_length_remaining(tvb, offset); /* draft-ietf-krb-wg-kerberos-clarifications-05.txt : * 7.5.1 * ASREP/TGSREP encryptedparts are encrypted with usage * == 3 or * == 8 or * == 9 */ plaintext=decrypt_krb5_data_asn1(tree, actx, 3, next_tvb, NULL); if(!plaintext){ plaintext=decrypt_krb5_data_asn1(tree, actx, 8, next_tvb, NULL); } if(!plaintext){ plaintext=decrypt_krb5_data_asn1(tree, actx, 9, next_tvb, NULL); } if(plaintext){ tvbuff_t *child_tvb; child_tvb = tvb_new_child_real_data(tvb, plaintext, length, length); /* Add the decrypted data to the data source list. */ add_new_data_source(actx->pinfo, child_tvb, "Decrypted Krb5"); offset=dissect_kerberos_Applications(FALSE, child_tvb, 0, actx , tree, /* hf_index*/ -1); } return offset; } static int dissect_krb5_decrypt_PA_ENC_TIMESTAMP (gboolean imp_tag _U_, tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_) { guint8 *plaintext; int length; tvbuff_t *next_tvb; next_tvb=tvb_new_subset_remaining(tvb, offset); length=tvb_captured_length_remaining(tvb, offset); /* draft-ietf-krb-wg-kerberos-clarifications-05.txt : * 7.5.1 * AS-REQ PA_ENC_TIMESTAMP are encrypted with usage * == 1 */ plaintext=decrypt_krb5_data_asn1(tree, actx, 1, next_tvb, NULL); if(plaintext){ tvbuff_t *child_tvb; child_tvb = tvb_new_child_real_data(tvb, plaintext, length, length); /* Add the decrypted data to the data source list. */ add_new_data_source(actx->pinfo, child_tvb, "Decrypted Krb5"); offset=dissect_kerberos_PA_ENC_TS_ENC(FALSE, child_tvb, 0, actx , tree, /* hf_index*/ -1); } return offset; } static int dissect_krb5_decrypt_AP_REP_data (gboolean imp_tag _U_, tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_) { guint8 *plaintext; int length; tvbuff_t *next_tvb; next_tvb=tvb_new_subset_remaining(tvb, offset); length=tvb_captured_length_remaining(tvb, offset); /* draft-ietf-krb-wg-kerberos-clarifications-05.txt : * 7.5.1 * AP-REP are encrypted with usage == 12 */ plaintext=decrypt_krb5_data_asn1(tree, actx, 12, next_tvb, NULL); if(plaintext){ tvbuff_t *child_tvb; child_tvb = tvb_new_child_real_data(tvb, plaintext, length, length); /* Add the decrypted data to the data source list. */ add_new_data_source(actx->pinfo, child_tvb, "Decrypted Krb5"); offset=dissect_kerberos_Applications(FALSE, child_tvb, 0, actx , tree, /* hf_index*/ -1); } return offset; } static int dissect_krb5_decrypt_PRIV_data (gboolean imp_tag _U_, tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_) { guint8 *plaintext; int length; tvbuff_t *next_tvb; next_tvb=tvb_new_subset_remaining(tvb, offset); length=tvb_captured_length_remaining(tvb, offset); /* RFC4120 : * EncKrbPrivPart encrypted with usage * == 13 */ plaintext=decrypt_krb5_data_asn1(tree, actx, 13, next_tvb, NULL); if(plaintext){ tvbuff_t *child_tvb; child_tvb = tvb_new_child_real_data(tvb, plaintext, length, length); /* Add the decrypted data to the data source list. */ add_new_data_source(actx->pinfo, child_tvb, "Decrypted Krb5"); offset=dissect_kerberos_Applications(FALSE, child_tvb, 0, actx , tree, /* hf_index*/ -1); } return offset; } static int dissect_krb5_decrypt_CRED_data (gboolean imp_tag _U_, tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_) { guint8 *plaintext; int length; tvbuff_t *next_tvb; next_tvb=tvb_new_subset_remaining(tvb, offset); length=tvb_captured_length_remaining(tvb, offset); /* RFC4120 : * EncKrbCredPart encrypted with usage * == 14 */ plaintext=decrypt_krb5_data_asn1(tree, actx, 14, next_tvb, NULL); if(plaintext){ tvbuff_t *child_tvb; child_tvb = tvb_new_child_real_data(tvb, plaintext, length, length); /* Add the decrypted data to the data source list. */ add_new_data_source(actx->pinfo, child_tvb, "Decrypted Krb5"); offset=dissect_kerberos_Applications(FALSE, child_tvb, 0, actx , tree, /* hf_index*/ -1); } return offset; } #endif static const int *hf_krb_pa_supported_enctypes_fields[] = { &hf_krb_pa_supported_enctypes_des_cbc_crc, &hf_krb_pa_supported_enctypes_des_cbc_md5, &hf_krb_pa_supported_enctypes_rc4_hmac, &hf_krb_pa_supported_enctypes_aes128_cts_hmac_sha1_96, &hf_krb_pa_supported_enctypes_aes256_cts_hmac_sha1_96, &hf_krb_pa_supported_enctypes_fast_supported, &hf_krb_pa_supported_enctypes_compound_identity_supported, &hf_krb_pa_supported_enctypes_claims_supported, &hf_krb_pa_supported_enctypes_resource_sid_compression_disabled, NULL, }; static const true_false_string supported_tfs = { "Supported", "Not supported" }; static int dissect_kerberos_PA_SUPPORTED_ENCTYPES(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) { actx->created_item = proto_tree_add_bitmask(tree, tvb, offset, hf_krb_pa_supported_enctypes, ett_krb_pa_supported_enctypes, hf_krb_pa_supported_enctypes_fields, ENC_LITTLE_ENDIAN); offset += 4; return offset; } static const int *hf_krb_ad_ap_options_fields[] = { &hf_krb_ad_ap_options_cbt, NULL, }; static const true_false_string set_tfs = { "Set", "Not set" }; static int dissect_kerberos_AD_AP_OPTIONS(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) { actx->created_item = proto_tree_add_bitmask(tree, tvb, offset, hf_krb_ad_ap_options, ett_krb_ad_ap_options, hf_krb_ad_ap_options_fields, ENC_LITTLE_ENDIAN); offset += 4; return offset; } static int dissect_kerberos_AD_TARGET_PRINCIPAL(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) { int tp_offset, tp_len; guint16 bc; bc = tvb_reported_length_remaining(tvb, offset); tp_offset = offset; tp_len = bc; proto_tree_add_item(tree, hf_krb_ad_target_principal, tvb, tp_offset, tp_len, ENC_UTF_16 | ENC_LITTLE_ENDIAN); return offset; } /* Dissect a GSSAPI checksum as per RFC1964. This is NOT ASN.1 encoded. */ static int dissect_krb5_rfc1964_checksum(asn1_ctx_t *actx _U_, proto_tree *tree, tvbuff_t *tvb) { int offset=0; guint32 len; guint16 dlglen; /* Length of Bnd field */ len=tvb_get_letohl(tvb, offset); proto_tree_add_item(tree, hf_krb_gssapi_len, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; /* Bnd field */ proto_tree_add_item(tree, hf_krb_gssapi_bnd, tvb, offset, len, ENC_NA); offset += len; /* flags */ proto_tree_add_item(tree, hf_krb_gssapi_c_flag_dce_style, tvb, offset, 4, ENC_LITTLE_ENDIAN); proto_tree_add_item(tree, hf_krb_gssapi_c_flag_integ, tvb, offset, 4, ENC_LITTLE_ENDIAN); proto_tree_add_item(tree, hf_krb_gssapi_c_flag_conf, tvb, offset, 4, ENC_LITTLE_ENDIAN); proto_tree_add_item(tree, hf_krb_gssapi_c_flag_sequence, tvb, offset, 4, ENC_LITTLE_ENDIAN); proto_tree_add_item(tree, hf_krb_gssapi_c_flag_replay, tvb, offset, 4, ENC_LITTLE_ENDIAN); proto_tree_add_item(tree, hf_krb_gssapi_c_flag_mutual, tvb, offset, 4, ENC_LITTLE_ENDIAN); proto_tree_add_item(tree, hf_krb_gssapi_c_flag_deleg, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; /* the next fields are optional so we have to check that we have * more data in our buffers */ if(tvb_reported_length_remaining(tvb, offset)<2){ return offset; } /* dlgopt identifier */ proto_tree_add_item(tree, hf_krb_gssapi_dlgopt, tvb, offset, 2, ENC_LITTLE_ENDIAN); offset += 2; if(tvb_reported_length_remaining(tvb, offset)<2){ return offset; } /* dlglen identifier */ dlglen=tvb_get_letohs(tvb, offset); proto_tree_add_item(tree, hf_krb_gssapi_dlglen, tvb, offset, 2, ENC_LITTLE_ENDIAN); offset += 2; if(dlglen!=tvb_reported_length_remaining(tvb, offset)){ proto_tree_add_expert_format(tree, actx->pinfo, &ei_krb_gssapi_dlglen, tvb, 0, 0, "Error: DlgLen:%d is not the same as number of bytes remaining:%d", dlglen, tvb_captured_length_remaining(tvb, offset)); return offset; } /* this should now be a KRB_CRED message */ offset=dissect_kerberos_Applications(FALSE, tvb, offset, actx, tree, /* hf_index */ -1); return offset; } static int dissect_krb5_PA_PROV_SRV_LOCATION(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) { offset=dissect_ber_GeneralString(actx, tree, tvb, offset, hf_krb_provsrv_location, NULL, 0); return offset; } static int dissect_krb5_PW_SALT(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) { kerberos_private_data_t *private_data = kerberos_get_private_data(actx); gint length; guint32 nt_status = 0; guint32 reserved = 0; guint32 flags = 0; /* * Microsoft stores a special 12 byte blob here * [MS-KILE] 2.2.1 KERB-EXT-ERROR * guint32 NT_status * guint32 reserved (== 0) * guint32 flags (at least 0x00000001 is set) */ length = tvb_reported_length_remaining(tvb, offset); if (length <= 0) { return offset; } if (length != 12) { goto no_error; } if (private_data->errorcode == 0) { goto no_error; } if (!private_data->try_nt_status) { goto no_error; } nt_status = tvb_get_letohl(tvb, offset); reserved = tvb_get_letohl(tvb, offset + 4); flags = tvb_get_letohl(tvb, offset + 8); if (nt_status == 0 || reserved != 0 || flags == 0) { goto no_error; } proto_tree_add_item(tree, hf_krb_ext_error_nt_status, tvb, offset, 4, ENC_LITTLE_ENDIAN); col_append_fstr(actx->pinfo->cinfo, COL_INFO, " NT Status: %s", val_to_str(nt_status, NT_errors, "Unknown error code %#x")); offset += 4; proto_tree_add_item(tree, hf_krb_ext_error_reserved, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; proto_tree_add_item(tree, hf_krb_ext_error_flags, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; return offset; no_error: proto_tree_add_item(tree, hf_krb_pw_salt, tvb, offset, length, ENC_NA); offset += length; return offset; } static int dissect_krb5_PAC_DREP(proto_tree *parent_tree, tvbuff_t *tvb, int offset, guint8 *drep) { proto_tree *tree; guint8 val; tree = proto_tree_add_subtree(parent_tree, tvb, offset, 16, ett_krb_pac_drep, NULL, "DREP"); val = tvb_get_guint8(tvb, offset); proto_tree_add_uint(tree, hf_dcerpc_drep_byteorder, tvb, offset, 1, val>>4); offset++; if (drep) { *drep = val; } return offset; } /* This might be some sort of header that MIDL generates when creating * marshalling/unmarshalling code for blobs that are not to be transported * ontop of DCERPC and where the DREP fields specifying things such as * endianess and similar are not available. */ static int dissect_krb5_PAC_NDRHEADERBLOB(proto_tree *parent_tree, tvbuff_t *tvb, int offset, guint8 *drep, asn1_ctx_t *actx _U_) { proto_tree *tree; tree = proto_tree_add_subtree(parent_tree, tvb, offset, 16, ett_krb_pac_midl_blob, NULL, "MES header"); /* modified DREP field that is used for stuff that is transporetd ontop of non dcerpc */ proto_tree_add_item(tree, hf_krb_midl_version, tvb, offset, 1, ENC_LITTLE_ENDIAN); offset++; offset = dissect_krb5_PAC_DREP(tree, tvb, offset, drep); proto_tree_add_item(tree, hf_krb_midl_hdr_len, tvb, offset, 2, ENC_LITTLE_ENDIAN); offset+=2; proto_tree_add_item(tree, hf_krb_midl_fill_bytes, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; /* length of blob that follows */ proto_tree_add_item(tree, hf_krb_midl_blob_len, tvb, offset, 8, ENC_LITTLE_ENDIAN); offset += 8; return offset; } static int dissect_krb5_PAC_LOGON_INFO(proto_tree *parent_tree, tvbuff_t *tvb, int offset, asn1_ctx_t *actx _U_) { proto_item *item; proto_tree *tree; guint8 drep[4] = { 0x10, 0x00, 0x00, 0x00}; /* fake DREP struct */ static dcerpc_info di; /* fake dcerpc_info struct */ static dcerpc_call_value call_data; item = proto_tree_add_item(parent_tree, hf_krb_pac_logon_info, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(item, ett_krb_pac_logon_info); /* skip the first 16 bytes, they are some magic created by the idl * compiler the first 4 bytes might be flags? */ offset = dissect_krb5_PAC_NDRHEADERBLOB(tree, tvb, offset, &drep[0], actx); /* the PAC_LOGON_INFO blob */ /* fake whatever state the dcerpc runtime support needs */ di.conformant_run=0; /* we need di->call_data->flags.NDR64 == 0 */ di.call_data=&call_data; init_ndr_pointer_list(&di); offset = dissect_ndr_pointer(tvb, offset, actx->pinfo, tree, &di, drep, netlogon_dissect_PAC_LOGON_INFO, NDR_POINTER_UNIQUE, "PAC_LOGON_INFO:", -1); return offset; } static int dissect_krb5_PAC_CREDENTIAL_DATA(proto_tree *parent_tree, tvbuff_t *tvb, int offset, packet_info *pinfo _U_) { proto_tree_add_item(parent_tree, hf_krb_pac_credential_data, tvb, offset, -1, ENC_NA); return offset; } static int dissect_krb5_PAC_CREDENTIAL_INFO(proto_tree *parent_tree, tvbuff_t *tvb, int offset, asn1_ctx_t *actx) { proto_item *item; proto_tree *tree; guint8 *plaintext = NULL; int plainlen = 0; int length = 0; #define KRB5_KU_OTHER_ENCRYPTED 16 #ifdef HAVE_KERBEROS guint32 etype; tvbuff_t *next_tvb; int usage = KRB5_KU_OTHER_ENCRYPTED; #endif item = proto_tree_add_item(parent_tree, hf_krb_pac_credential_info, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(item, ett_krb_pac_credential_info); /* version */ proto_tree_add_item(tree, hf_krb_pac_credential_info_version, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset+=4; #ifdef HAVE_KERBEROS /* etype */ etype = tvb_get_letohl(tvb, offset); #endif proto_tree_add_item(tree, hf_krb_pac_credential_info_etype, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset+=4; #ifdef HAVE_KERBEROS /* data */ next_tvb=tvb_new_subset_remaining(tvb, offset); length=tvb_captured_length_remaining(tvb, offset); plaintext=decrypt_krb5_data(tree, actx->pinfo, usage, next_tvb, (int)etype, &plainlen); #endif if (plaintext != NULL) { tvbuff_t *child_tvb; child_tvb = tvb_new_child_real_data(tvb, plaintext, plainlen, plainlen); /* Add the decrypted data to the data source list. */ add_new_data_source(actx->pinfo, child_tvb, "Decrypted Krb5"); dissect_krb5_PAC_CREDENTIAL_DATA(tree, child_tvb, 0, actx->pinfo); } return offset + length; } static int dissect_krb5_PAC_S4U_DELEGATION_INFO(proto_tree *parent_tree, tvbuff_t *tvb, int offset, asn1_ctx_t *actx) { proto_item *item; proto_tree *tree; guint8 drep[4] = { 0x10, 0x00, 0x00, 0x00}; /* fake DREP struct */ static dcerpc_info di; /* fake dcerpc_info struct */ static dcerpc_call_value call_data; item = proto_tree_add_item(parent_tree, hf_krb_pac_s4u_delegation_info, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(item, ett_krb_pac_s4u_delegation_info); /* skip the first 16 bytes, they are some magic created by the idl * compiler the first 4 bytes might be flags? */ offset = dissect_krb5_PAC_NDRHEADERBLOB(tree, tvb, offset, &drep[0], actx); /* the S4U_DELEGATION_INFO blob. See [MS-PAC] */ /* fake whatever state the dcerpc runtime support needs */ di.conformant_run=0; /* we need di->call_data->flags.NDR64 == 0 */ di.call_data=&call_data; init_ndr_pointer_list(&di); offset = dissect_ndr_pointer(tvb, offset, actx->pinfo, tree, &di, drep, netlogon_dissect_PAC_S4U_DELEGATION_INFO, NDR_POINTER_UNIQUE, "PAC_S4U_DELEGATION_INFO:", -1); return offset; } static int dissect_krb5_PAC_UPN_DNS_INFO(proto_tree *parent_tree, tvbuff_t *tvb, int offset, asn1_ctx_t *actx _U_) { proto_item *item; proto_tree *tree; guint16 dns_offset, dns_len; guint16 upn_offset, upn_len; item = proto_tree_add_item(parent_tree, hf_krb_pac_upn_dns_info, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(item, ett_krb_pac_upn_dns_info); /* upn */ upn_len = tvb_get_letohs(tvb, offset); proto_tree_add_item(tree, hf_krb_pac_upn_upn_len, tvb, offset, 2, ENC_LITTLE_ENDIAN); offset+=2; upn_offset = tvb_get_letohs(tvb, offset); proto_tree_add_item(tree, hf_krb_pac_upn_upn_offset, tvb, offset, 2, ENC_LITTLE_ENDIAN); offset+=2; /* dns */ dns_len = tvb_get_letohs(tvb, offset); proto_tree_add_item(tree, hf_krb_pac_upn_dns_len, tvb, offset, 2, ENC_LITTLE_ENDIAN); offset+=2; dns_offset = tvb_get_letohs(tvb, offset); proto_tree_add_item(tree, hf_krb_pac_upn_dns_offset, tvb, offset, 2, ENC_LITTLE_ENDIAN); offset+=2; /* flags */ proto_tree_add_item(tree, hf_krb_pac_upn_flags, tvb, offset, 4, ENC_LITTLE_ENDIAN); /* upn */ proto_tree_add_item(tree, hf_krb_pac_upn_upn_name, tvb, upn_offset, upn_len, ENC_UTF_16|ENC_LITTLE_ENDIAN); /* dns */ proto_tree_add_item(tree, hf_krb_pac_upn_dns_name, tvb, dns_offset, dns_len, ENC_UTF_16|ENC_LITTLE_ENDIAN); return dns_offset; } static int dissect_krb5_PAC_CLIENT_CLAIMS_INFO(proto_tree *parent_tree, tvbuff_t *tvb, int offset, asn1_ctx_t *actx _U_) { int length = tvb_captured_length_remaining(tvb, offset); if (length == 0) { return offset; } proto_tree_add_item(parent_tree, hf_krb_pac_client_claims_info, tvb, offset, -1, ENC_NA); return offset; } static int dissect_krb5_PAC_DEVICE_INFO(proto_tree *parent_tree, tvbuff_t *tvb, int offset, asn1_ctx_t *actx _U_) { proto_item *item; proto_tree *tree; guint8 drep[4] = { 0x10, 0x00, 0x00, 0x00}; /* fake DREP struct */ static dcerpc_info di; /* fake dcerpc_info struct */ static dcerpc_call_value call_data; item = proto_tree_add_item(parent_tree, hf_krb_pac_device_info, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(item, ett_krb_pac_device_info); /* skip the first 16 bytes, they are some magic created by the idl * compiler the first 4 bytes might be flags? */ offset = dissect_krb5_PAC_NDRHEADERBLOB(tree, tvb, offset, &drep[0], actx); /* the PAC_DEVICE_INFO blob */ /* fake whatever state the dcerpc runtime support needs */ di.conformant_run=0; /* we need di->call_data->flags.NDR64 == 0 */ di.call_data=&call_data; init_ndr_pointer_list(&di); offset = dissect_ndr_pointer(tvb, offset, actx->pinfo, tree, &di, drep, netlogon_dissect_PAC_DEVICE_INFO, NDR_POINTER_UNIQUE, "PAC_DEVICE_INFO:", -1); return offset; } static int dissect_krb5_PAC_DEVICE_CLAIMS_INFO(proto_tree *parent_tree, tvbuff_t *tvb, int offset, asn1_ctx_t *actx _U_) { int length = tvb_captured_length_remaining(tvb, offset); if (length == 0) { return offset; } proto_tree_add_item(parent_tree, hf_krb_pac_device_claims_info, tvb, offset, -1, ENC_NA); return offset; } static int dissect_krb5_PAC_SERVER_CHECKSUM(proto_tree *parent_tree, tvbuff_t *tvb, int offset, asn1_ctx_t *actx _U_) { proto_item *item; proto_tree *tree; item = proto_tree_add_item(parent_tree, hf_krb_pac_server_checksum, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(item, ett_krb_pac_server_checksum); /* signature type */ proto_tree_add_item(tree, hf_krb_pac_signature_type, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset+=4; /* signature data */ proto_tree_add_item(tree, hf_krb_pac_signature_signature, tvb, offset, -1, ENC_NA); return offset; } static int dissect_krb5_PAC_PRIVSVR_CHECKSUM(proto_tree *parent_tree, tvbuff_t *tvb, int offset, asn1_ctx_t *actx _U_) { proto_item *item; proto_tree *tree; item = proto_tree_add_item(parent_tree, hf_krb_pac_privsvr_checksum, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(item, ett_krb_pac_privsvr_checksum); /* signature type */ proto_tree_add_item(tree, hf_krb_pac_signature_type, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset+=4; /* signature data */ proto_tree_add_item(tree, hf_krb_pac_signature_signature, tvb, offset, -1, ENC_NA); return offset; } static int dissect_krb5_PAC_CLIENT_INFO_TYPE(proto_tree *parent_tree, tvbuff_t *tvb, int offset, asn1_ctx_t *actx _U_) { proto_item *item; proto_tree *tree; guint16 namelen; item = proto_tree_add_item(parent_tree, hf_krb_pac_client_info_type, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(item, ett_krb_pac_client_info_type); /* clientid */ offset = dissect_nt_64bit_time(tvb, tree, offset, hf_krb_pac_clientid); /* name length */ namelen=tvb_get_letohs(tvb, offset); proto_tree_add_uint(tree, hf_krb_pac_namelen, tvb, offset, 2, namelen); offset+=2; /* client name */ proto_tree_add_item(tree, hf_krb_pac_clientname, tvb, offset, namelen, ENC_UTF_16|ENC_LITTLE_ENDIAN); offset+=namelen; return offset; } static int dissect_krb5_AD_WIN2K_PAC_struct(proto_tree *tree, tvbuff_t *tvb, int offset, asn1_ctx_t *actx) { guint32 pac_type; guint32 pac_size; guint32 pac_offset; proto_item *it=NULL; proto_tree *tr=NULL; tvbuff_t *next_tvb; /* type of pac data */ pac_type=tvb_get_letohl(tvb, offset); it=proto_tree_add_uint(tree, hf_krb_w2k_pac_type, tvb, offset, 4, pac_type); tr=proto_item_add_subtree(it, ett_krb_pac); offset += 4; /* size of pac data */ pac_size=tvb_get_letohl(tvb, offset); proto_tree_add_uint(tr, hf_krb_w2k_pac_size, tvb, offset, 4, pac_size); offset += 4; /* offset to pac data */ pac_offset=tvb_get_letohl(tvb, offset); proto_tree_add_uint(tr, hf_krb_w2k_pac_offset, tvb, offset, 4, pac_offset); offset += 8; next_tvb=tvb_new_subset_length_caplen(tvb, pac_offset, pac_size, pac_size); switch(pac_type){ case PAC_LOGON_INFO: dissect_krb5_PAC_LOGON_INFO(tr, next_tvb, 0, actx); break; case PAC_CREDENTIAL_TYPE: dissect_krb5_PAC_CREDENTIAL_INFO(tr, next_tvb, 0, actx); break; case PAC_SERVER_CHECKSUM: dissect_krb5_PAC_SERVER_CHECKSUM(tr, next_tvb, 0, actx); break; case PAC_PRIVSVR_CHECKSUM: dissect_krb5_PAC_PRIVSVR_CHECKSUM(tr, next_tvb, 0, actx); break; case PAC_CLIENT_INFO_TYPE: dissect_krb5_PAC_CLIENT_INFO_TYPE(tr, next_tvb, 0, actx); break; case PAC_S4U_DELEGATION_INFO: dissect_krb5_PAC_S4U_DELEGATION_INFO(tr, next_tvb, 0, actx); break; case PAC_UPN_DNS_INFO: dissect_krb5_PAC_UPN_DNS_INFO(tr, next_tvb, 0, actx); break; case PAC_CLIENT_CLAIMS_INFO: dissect_krb5_PAC_CLIENT_CLAIMS_INFO(tr, next_tvb, 0, actx); break; case PAC_DEVICE_INFO: dissect_krb5_PAC_DEVICE_INFO(tr, next_tvb, 0, actx); break; case PAC_DEVICE_CLAIMS_INFO: dissect_krb5_PAC_DEVICE_CLAIMS_INFO(tr, next_tvb, 0, actx); break; default: break; } return offset; } static int dissect_krb5_AD_WIN2K_PAC(gboolean implicit_tag _U_, tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_) { guint32 entries; guint32 version; guint32 i; #if defined(HAVE_MIT_KERBEROS) && defined(HAVE_KRB5_PAC_VERIFY) verify_krb5_pac(tree, actx, tvb); #endif /* first in the PAC structure comes the number of entries */ entries=tvb_get_letohl(tvb, offset); proto_tree_add_uint(tree, hf_krb_w2k_pac_entries, tvb, offset, 4, entries); offset += 4; /* second comes the version */ version=tvb_get_letohl(tvb, offset); proto_tree_add_uint(tree, hf_krb_w2k_pac_version, tvb, offset, 4, version); offset += 4; for(i=0;i 10 * 1024 * 1024) { return (-1); } if (do_col_protocol) { col_set_str(pinfo->cinfo, COL_PROTOCOL, "KRB5"); } if (tree) { item = proto_tree_add_item(tree, proto_kerberos, tvb, 0, -1, ENC_NA); kerberos_tree = proto_item_add_subtree(item, ett_kerberos); } show_krb_recordmark(kerberos_tree, tvb, offset, krb_rm); offset += 4; } else { /* Do some sanity checking here, * All krb5 packets start with a TAG class that is BER_CLASS_APP * and a tag value that is either of the values below: * If it doesn't look like kerberos, return 0 and let someone else have * a go at it. */ gint8 tmp_class; gboolean tmp_pc; gint32 tmp_tag; get_ber_identifier(tvb, offset, &tmp_class, &tmp_pc, &tmp_tag); if(tmp_class!=BER_CLASS_APP){ return 0; } switch(tmp_tag){ case KRB5_MSG_TICKET: case KRB5_MSG_AUTHENTICATOR: case KRB5_MSG_ENC_TICKET_PART: case KRB5_MSG_AS_REQ: case KRB5_MSG_AS_REP: case KRB5_MSG_TGS_REQ: case KRB5_MSG_TGS_REP: case KRB5_MSG_AP_REQ: case KRB5_MSG_AP_REP: case KRB5_MSG_ENC_AS_REP_PART: case KRB5_MSG_ENC_TGS_REP_PART: case KRB5_MSG_ENC_AP_REP_PART: case KRB5_MSG_ENC_KRB_PRIV_PART: case KRB5_MSG_ENC_KRB_CRED_PART: case KRB5_MSG_SAFE: case KRB5_MSG_PRIV: case KRB5_MSG_ERROR: break; default: return 0; } if (do_col_protocol) { col_set_str(pinfo->cinfo, COL_PROTOCOL, "KRB5"); } if (gbl_do_col_info) { col_clear(pinfo->cinfo, COL_INFO); } if (tree) { item = proto_tree_add_item(tree, proto_kerberos, tvb, 0, -1, ENC_NA); kerberos_tree = proto_item_add_subtree(item, ett_kerberos); } } asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo); asn1_ctx.private_data = NULL; private_data = kerberos_get_private_data(&asn1_ctx); private_data->callbacks = cb; TRY { offset=dissect_kerberos_Applications(FALSE, tvb, offset, &asn1_ctx , kerberos_tree, /* hf_index */ -1); } CATCH_BOUNDS_ERRORS { RETHROW; } ENDTRY; proto_item_set_len(item, offset); return offset; } /* * Display the TCP record mark. */ void show_krb_recordmark(proto_tree *tree, tvbuff_t *tvb, gint start, guint32 krb_rm) { gint rec_len; proto_tree *rm_tree; if (tree == NULL) return; rec_len = kerberos_rm_to_reclen(krb_rm); rm_tree = proto_tree_add_subtree_format(tree, tvb, start, 4, ett_krb_recordmark, NULL, "Record Mark: %u %s", rec_len, plurality(rec_len, "byte", "bytes")); proto_tree_add_boolean(rm_tree, hf_krb_rm_reserved, tvb, start, 4, krb_rm); proto_tree_add_uint(rm_tree, hf_krb_rm_reclen, tvb, start, 4, krb_rm); } gint dissect_kerberos_main(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int do_col_info, kerberos_callbacks *cb) { return (dissect_kerberos_common(tvb, pinfo, tree, do_col_info, FALSE, FALSE, cb)); } guint32 kerberos_output_keytype(void) { return gbl_keytype; } static gint dissect_kerberos_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) { /* Some weird kerberos implementation apparently do krb4 on the krb5 port. Since all (except weirdo transarc krb4 stuff) use an opcode <=16 in the first byte, use this to see if it might be krb4. All krb5 commands start with an APPL tag and thus is >=0x60 so if first byte is <=16 just blindly assume it is krb4 then */ if(tvb_captured_length(tvb) >= 1 && tvb_get_guint8(tvb, 0)<=0x10){ if(krb4_handle){ gboolean res; res=call_dissector_only(krb4_handle, tvb, pinfo, tree, NULL); return res; }else{ return 0; } } return dissect_kerberos_common(tvb, pinfo, tree, TRUE, TRUE, FALSE, NULL); } gint kerberos_rm_to_reclen(guint krb_rm) { return (krb_rm & KRB_RM_RECLEN); } guint get_krb_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_) { guint krb_rm; gint pdulen; krb_rm = tvb_get_ntohl(tvb, offset); pdulen = kerberos_rm_to_reclen(krb_rm); return (pdulen + 4); } static void kerberos_prefs_apply_cb(void) { #ifdef HAVE_LIBNETTLE clear_keytab(); read_keytab_file(keytab_filename); #endif } static int dissect_kerberos_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { pinfo->fragmented = TRUE; if (dissect_kerberos_common(tvb, pinfo, tree, TRUE, TRUE, TRUE, NULL) < 0) { /* * The dissector failed to recognize this as a valid * Kerberos message. Mark it as a continuation packet. */ col_set_str(pinfo->cinfo, COL_INFO, "Continuation"); } return tvb_captured_length(tvb); } static int dissect_kerberos_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data) { col_set_str(pinfo->cinfo, COL_PROTOCOL, "KRB5"); col_clear(pinfo->cinfo, COL_INFO); tcp_dissect_pdus(tvb, pinfo, tree, krb_desegment, 4, get_krb_pdu_len, dissect_kerberos_tcp_pdu, data); return tvb_captured_length(tvb); } /*--- proto_register_kerberos -------------------------------------------*/ void proto_register_kerberos(void) { /* List of fields */ static hf_register_info hf[] = { { &hf_krb_rm_reserved, { "Reserved", "kerberos.rm.reserved", FT_BOOLEAN, 32, TFS(&tfs_set_notset), KRB_RM_RESERVED, "Record mark reserved bit", HFILL }}, { &hf_krb_rm_reclen, { "Record Length", "kerberos.rm.length", FT_UINT32, BASE_DEC, NULL, KRB_RM_RECLEN, NULL, HFILL }}, { &hf_krb_provsrv_location, { "PROVSRV Location", "kerberos.provsrv_location", FT_STRING, BASE_NONE, NULL, 0, "PacketCable PROV SRV Location", HFILL }}, { &hf_krb_pw_salt, { "pw-salt", "kerberos.pw_salt", FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }}, { &hf_krb_ext_error_nt_status, /* we keep kerberos.smb.nt_status for compat reasons */ { "NT Status", "kerberos.smb.nt_status", FT_UINT32, BASE_HEX, VALS(NT_errors), 0, "NT Status code", HFILL }}, { &hf_krb_ext_error_reserved, { "Reserved", "kerberos.ext_error.reserved", FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL }}, { &hf_krb_ext_error_flags, { "Flags", "kerberos.ext_error.flags", FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL }}, { &hf_krb_address_ip, { "IP Address", "kerberos.addr_ip", FT_IPv4, BASE_NONE, NULL, 0, NULL, HFILL }}, { &hf_krb_address_ipv6, { "IPv6 Address", "kerberos.addr_ipv6", FT_IPv6, BASE_NONE, NULL, 0, NULL, HFILL }}, { &hf_krb_address_netbios, { "NetBIOS Address", "kerberos.addr_nb", FT_STRING, BASE_NONE, NULL, 0, "NetBIOS Address and type", HFILL }}, { &hf_krb_gssapi_len, { "Length", "kerberos.gssapi.len", FT_UINT32, BASE_DEC, NULL, 0, "Length of GSSAPI Bnd field", HFILL }}, { &hf_krb_gssapi_bnd, { "Bnd", "kerberos.gssapi.bdn", FT_BYTES, BASE_NONE, NULL, 0, "GSSAPI Bnd field", HFILL }}, { &hf_krb_gssapi_c_flag_deleg, { "Deleg", "kerberos.gssapi.checksum.flags.deleg", FT_BOOLEAN, 32, TFS(&tfs_gss_flags_deleg), KRB5_GSS_C_DELEG_FLAG, NULL, HFILL }}, { &hf_krb_gssapi_c_flag_mutual, { "Mutual", "kerberos.gssapi.checksum.flags.mutual", FT_BOOLEAN, 32, TFS(&tfs_gss_flags_mutual), KRB5_GSS_C_MUTUAL_FLAG, NULL, HFILL }}, { &hf_krb_gssapi_c_flag_replay, { "Replay", "kerberos.gssapi.checksum.flags.replay", FT_BOOLEAN, 32, TFS(&tfs_gss_flags_replay), KRB5_GSS_C_REPLAY_FLAG, NULL, HFILL }}, { &hf_krb_gssapi_c_flag_sequence, { "Sequence", "kerberos.gssapi.checksum.flags.sequence", FT_BOOLEAN, 32, TFS(&tfs_gss_flags_sequence), KRB5_GSS_C_SEQUENCE_FLAG, NULL, HFILL }}, { &hf_krb_gssapi_c_flag_conf, { "Conf", "kerberos.gssapi.checksum.flags.conf", FT_BOOLEAN, 32, TFS(&tfs_gss_flags_conf), KRB5_GSS_C_CONF_FLAG, NULL, HFILL }}, { &hf_krb_gssapi_c_flag_integ, { "Integ", "kerberos.gssapi.checksum.flags.integ", FT_BOOLEAN, 32, TFS(&tfs_gss_flags_integ), KRB5_GSS_C_INTEG_FLAG, NULL, HFILL }}, { &hf_krb_gssapi_c_flag_dce_style, { "DCE-style", "kerberos.gssapi.checksum.flags.dce-style", FT_BOOLEAN, 32, TFS(&tfs_gss_flags_dce_style), KRB5_GSS_C_DCE_STYLE, NULL, HFILL }}, { &hf_krb_gssapi_dlgopt, { "DlgOpt", "kerberos.gssapi.dlgopt", FT_UINT16, BASE_DEC, NULL, 0, "GSSAPI DlgOpt", HFILL }}, { &hf_krb_gssapi_dlglen, { "DlgLen", "kerberos.gssapi.dlglen", FT_UINT16, BASE_DEC, NULL, 0, "GSSAPI DlgLen", HFILL }}, { &hf_krb_midl_blob_len, { "Blob Length", "kerberos.midl_blob_len", FT_UINT64, BASE_DEC, NULL, 0, "Length of NDR encoded data that follows", HFILL }}, { &hf_krb_midl_fill_bytes, { "Fill bytes", "kerberos.midl.fill_bytes", FT_UINT32, BASE_HEX, NULL, 0, "Just some fill bytes", HFILL }}, { &hf_krb_midl_version, { "Version", "kerberos.midl.version", FT_UINT8, BASE_DEC, NULL, 0, "Version of pickling", HFILL }}, { &hf_krb_midl_hdr_len, { "HDR Length", "kerberos.midl.hdr_len", FT_UINT16, BASE_DEC, NULL, 0, "Length of header", HFILL }}, { &hf_krb_pac_signature_type, { "Type", "kerberos.pac.signature.type", FT_INT32, BASE_DEC, NULL, 0, "PAC Signature Type", HFILL }}, { &hf_krb_pac_signature_signature, { "Signature", "kerberos.pac.signature.signature", FT_BYTES, BASE_NONE, NULL, 0, "A PAC signature blob", HFILL }}, { &hf_krb_w2k_pac_entries, { "Num Entries", "kerberos.pac.entries", FT_UINT32, BASE_DEC, NULL, 0, "Number of W2k PAC entries", HFILL }}, { &hf_krb_w2k_pac_version, { "Version", "kerberos.pac.version", FT_UINT32, BASE_DEC, NULL, 0, "Version of PAC structures", HFILL }}, { &hf_krb_w2k_pac_type, { "Type", "kerberos.pac.type", FT_UINT32, BASE_DEC, VALS(w2k_pac_types), 0, "Type of W2k PAC entry", HFILL }}, { &hf_krb_w2k_pac_size, { "Size", "kerberos.pac.size", FT_UINT32, BASE_DEC, NULL, 0, "Size of W2k PAC entry", HFILL }}, { &hf_krb_w2k_pac_offset, { "Offset", "kerberos.pac.offset", FT_UINT32, BASE_DEC, NULL, 0, "Offset to W2k PAC entry", HFILL }}, { &hf_krb_pac_clientid, { "ClientID", "kerberos.pac.clientid", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0, "ClientID Timestamp", HFILL }}, { &hf_krb_pac_namelen, { "Name Length", "kerberos.pac.namelen", FT_UINT16, BASE_DEC, NULL, 0, "Length of client name", HFILL }}, { &hf_krb_pac_clientname, { "Name", "kerberos.pac.name", FT_STRING, BASE_NONE, NULL, 0, "Name of the Client in the PAC structure", HFILL }}, { &hf_krb_pac_logon_info, { "PAC_LOGON_INFO", "kerberos.pac_logon_info", FT_BYTES, BASE_NONE, NULL, 0, "PAC_LOGON_INFO structure", HFILL }}, { &hf_krb_pac_credential_data, { "PAC_CREDENTIAL_DATA", "kerberos.pac_credential_data", FT_BYTES, BASE_NONE, NULL, 0, "PAC_CREDENTIAL_DATA structure", HFILL }}, { &hf_krb_pac_credential_info, { "PAC_CREDENTIAL_INFO", "kerberos.pac_credential_info", FT_BYTES, BASE_NONE, NULL, 0, "PAC_CREDENTIAL_INFO structure", HFILL }}, { &hf_krb_pac_credential_info_version, { "Version", "kerberos.pac_credential_info.version", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_krb_pac_credential_info_etype, { "Etype", "kerberos.pac_credential_info.etype", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_krb_pac_server_checksum, { "PAC_SERVER_CHECKSUM", "kerberos.pac_server_checksum", FT_BYTES, BASE_NONE, NULL, 0, "PAC_SERVER_CHECKSUM structure", HFILL }}, { &hf_krb_pac_privsvr_checksum, { "PAC_PRIVSVR_CHECKSUM", "kerberos.pac_privsvr_checksum", FT_BYTES, BASE_NONE, NULL, 0, "PAC_PRIVSVR_CHECKSUM structure", HFILL }}, { &hf_krb_pac_client_info_type, { "PAC_CLIENT_INFO_TYPE", "kerberos.pac_client_info_type", FT_BYTES, BASE_NONE, NULL, 0, "PAC_CLIENT_INFO_TYPE structure", HFILL }}, { &hf_krb_pac_s4u_delegation_info, { "PAC_S4U_DELEGATION_INFO", "kerberos.pac_s4u_delegation_info", FT_BYTES, BASE_NONE, NULL, 0, "PAC_S4U_DELEGATION_INFO structure", HFILL }}, { &hf_krb_pac_upn_dns_info, { "UPN_DNS_INFO", "kerberos.pac_upn_dns_info", FT_BYTES, BASE_NONE, NULL, 0, "UPN_DNS_INFO structure", HFILL }}, { &hf_krb_pac_upn_flags, { "Flags", "kerberos.pac.upn.flags", FT_UINT32, BASE_HEX, NULL, 0, "UPN flags", HFILL }}, { &hf_krb_pac_upn_dns_offset, { "DNS Offset", "kerberos.pac.upn.dns_offset", FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_krb_pac_upn_dns_len, { "DNS Len", "kerberos.pac.upn.dns_len", FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_krb_pac_upn_upn_offset, { "UPN Offset", "kerberos.pac.upn.upn_offset", FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_krb_pac_upn_upn_len, { "UPN Len", "kerberos.pac.upn.upn_len", FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_krb_pac_upn_upn_name, { "UPN Name", "kerberos.pac.upn.upn_name", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }}, { &hf_krb_pac_upn_dns_name, { "DNS Name", "kerberos.pac.upn.dns_name", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }}, { &hf_krb_pac_client_claims_info, { "PAC_CLIENT_CLAIMS_INFO", "kerberos.pac_client_claims_info", FT_BYTES, BASE_NONE, NULL, 0, "PAC_CLIENT_CLAIMS_INFO structure", HFILL }}, { &hf_krb_pac_device_info, { "PAC_DEVICE_INFO", "kerberos.pac_device_info", FT_BYTES, BASE_NONE, NULL, 0, "PAC_DEVICE_INFO structure", HFILL }}, { &hf_krb_pac_device_claims_info, { "PAC_DEVICE_CLAIMS_INFO", "kerberos.pac_device_claims_info", FT_BYTES, BASE_NONE, NULL, 0, "PAC_DEVICE_CLAIMS_INFO structure", HFILL }}, { &hf_krb_pa_supported_enctypes, { "SupportedEnctypes", "kerberos.supported_entypes", FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL }}, { &hf_krb_pa_supported_enctypes_des_cbc_crc, { "des-cbc-crc", "kerberos.supported_entypes.des-cbc-crc", FT_BOOLEAN, 32, TFS(&supported_tfs), 0x00000001, NULL, HFILL }}, { &hf_krb_pa_supported_enctypes_des_cbc_md5, { "des-cbc-md5", "kerberos.supported_entypes.des-cbc-md5", FT_BOOLEAN, 32, TFS(&supported_tfs), 0x00000002, NULL, HFILL }}, { &hf_krb_pa_supported_enctypes_rc4_hmac, { "rc4-hmac", "kerberos.supported_entypes.rc4-hmac", FT_BOOLEAN, 32, TFS(&supported_tfs), 0x00000004, NULL, HFILL }}, { &hf_krb_pa_supported_enctypes_aes128_cts_hmac_sha1_96, { "aes128-cts-hmac-sha1-96", "kerberos.supported_entypes.aes128-cts-hmac-sha1-96", FT_BOOLEAN, 32, TFS(&supported_tfs), 0x00000008, NULL, HFILL }}, { &hf_krb_pa_supported_enctypes_aes256_cts_hmac_sha1_96, { "aes256-cts-hmac-sha1-96", "kerberos.supported_entypes.aes256-cts-hmac-sha1-96", FT_BOOLEAN, 32, TFS(&supported_tfs), 0x00000010, NULL, HFILL }}, { &hf_krb_pa_supported_enctypes_fast_supported, { "fast-supported", "kerberos.supported_entypes.fast-supported", FT_BOOLEAN, 32, TFS(&supported_tfs), 0x00010000, NULL, HFILL }}, { &hf_krb_pa_supported_enctypes_compound_identity_supported, { "compound-identity-supported", "kerberos.supported_entypes.compound-identity-supported", FT_BOOLEAN, 32, TFS(&supported_tfs), 0x00020000, NULL, HFILL }}, { &hf_krb_pa_supported_enctypes_claims_supported, { "claims-supported", "kerberos.supported_entypes.claims-supported", FT_BOOLEAN, 32, TFS(&supported_tfs), 0x00040000, NULL, HFILL }}, { &hf_krb_pa_supported_enctypes_resource_sid_compression_disabled, { "resource-sid-compression-disabled", "kerberos.supported_entypes.resource-sid-compression-disabled", FT_BOOLEAN, 32, TFS(&supported_tfs), 0x00080000, NULL, HFILL }}, { &hf_krb_ad_ap_options, { "AD-AP-Options", "kerberos.ad_ap_options", FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL }}, { &hf_krb_ad_ap_options_cbt, { "ChannelBindings", "kerberos.ad_ap_options.cbt", FT_BOOLEAN, 32, TFS(&set_tfs), 0x00004000, NULL, HFILL }}, { &hf_krb_ad_target_principal, { "Target Principal", "kerberos.ad_target_principal", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }}, #ifdef HAVE_KERBEROS { &hf_krb_patimestamp, { "patimestamp", "kerberos.patimestamp", FT_STRING, BASE_NONE, NULL, 0, "KerberosTime", HFILL }}, { &hf_krb_pausec, { "pausec", "kerberos.pausec", FT_UINT32, BASE_DEC, NULL, 0, "Microseconds", HFILL }}, #endif #include "packet-kerberos-hfarr.c" }; /* List of subtrees */ static gint *ett[] = { &ett_kerberos, &ett_krb_recordmark, &ett_krb_pac, &ett_krb_pac_drep, &ett_krb_pac_midl_blob, &ett_krb_pac_logon_info, &ett_krb_pac_credential_info, &ett_krb_pac_s4u_delegation_info, &ett_krb_pac_upn_dns_info, &ett_krb_pac_device_info, &ett_krb_pac_server_checksum, &ett_krb_pac_privsvr_checksum, &ett_krb_pac_client_info_type, &ett_krb_pa_supported_enctypes, &ett_krb_ad_ap_options, #ifdef HAVE_KERBEROS &ett_krb_pa_enc_ts_enc, #endif #include "packet-kerberos-ettarr.c" }; static ei_register_info ei[] = { { &ei_kerberos_decrypted_keytype, { "kerberos.decrypted_keytype", PI_SECURITY, PI_CHAT, "Decryted keytype", EXPFILL }}, { &ei_kerberos_address, { "kerberos.address.unknown", PI_UNDECODED, PI_WARN, "KRB Address: I don't know how to parse this type of address yet", EXPFILL }}, { &ei_krb_gssapi_dlglen, { "kerberos.gssapi.dlglen.error", PI_MALFORMED, PI_ERROR, "DlgLen is not the same as number of bytes remaining", EXPFILL }}, }; expert_module_t* expert_krb; module_t *krb_module; proto_kerberos = proto_register_protocol("Kerberos", "KRB5", "kerberos"); proto_register_field_array(proto_kerberos, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); expert_krb = expert_register_protocol(proto_kerberos); expert_register_field_array(expert_krb, ei, array_length(ei)); /* Register preferences */ krb_module = prefs_register_protocol(proto_kerberos, kerberos_prefs_apply_cb); prefs_register_bool_preference(krb_module, "desegment", "Reassemble Kerberos over TCP messages spanning multiple TCP segments", "Whether the Kerberos dissector should reassemble messages spanning multiple TCP segments." " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.", &krb_desegment); #ifdef HAVE_KERBEROS prefs_register_bool_preference(krb_module, "decrypt", "Try to decrypt Kerberos blobs", "Whether the dissector should try to decrypt " "encrypted Kerberos blobs. This requires that the proper " "keytab file is installed as well.", &krb_decrypt); prefs_register_filename_preference(krb_module, "file", "Kerberos keytab file", "The keytab file containing all the secrets", &keytab_filename, FALSE); #endif } static int wrap_dissect_gss_kerb(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree, dcerpc_info *di _U_,guint8 *drep _U_) { tvbuff_t *auth_tvb; auth_tvb = tvb_new_subset_remaining(tvb, offset); dissect_kerberos_main(auth_tvb, pinfo, tree, FALSE, NULL); return tvb_captured_length_remaining(tvb, offset); } static dcerpc_auth_subdissector_fns gss_kerb_auth_connect_fns = { wrap_dissect_gss_kerb, /* Bind */ wrap_dissect_gss_kerb, /* Bind ACK */ wrap_dissect_gss_kerb, /* AUTH3 */ NULL, /* Request verifier */ NULL, /* Response verifier */ NULL, /* Request data */ NULL /* Response data */ }; static dcerpc_auth_subdissector_fns gss_kerb_auth_sign_fns = { wrap_dissect_gss_kerb, /* Bind */ wrap_dissect_gss_kerb, /* Bind ACK */ wrap_dissect_gss_kerb, /* AUTH3 */ wrap_dissect_gssapi_verf, /* Request verifier */ wrap_dissect_gssapi_verf, /* Response verifier */ NULL, /* Request data */ NULL /* Response data */ }; static dcerpc_auth_subdissector_fns gss_kerb_auth_seal_fns = { wrap_dissect_gss_kerb, /* Bind */ wrap_dissect_gss_kerb, /* Bind ACK */ wrap_dissect_gss_kerb, /* AUTH3 */ wrap_dissect_gssapi_verf, /* Request verifier */ wrap_dissect_gssapi_verf, /* Response verifier */ wrap_dissect_gssapi_payload, /* Request data */ wrap_dissect_gssapi_payload /* Response data */ }; void proto_reg_handoff_kerberos(void) { dissector_handle_t kerberos_handle_tcp; krb4_handle = find_dissector_add_dependency("krb4", proto_kerberos); kerberos_handle_udp = create_dissector_handle(dissect_kerberos_udp, proto_kerberos); kerberos_handle_tcp = create_dissector_handle(dissect_kerberos_tcp, proto_kerberos); dissector_add_uint_with_preference("udp.port", UDP_PORT_KERBEROS, kerberos_handle_udp); dissector_add_uint_with_preference("tcp.port", TCP_PORT_KERBEROS, kerberos_handle_tcp); register_dcerpc_auth_subdissector(DCE_C_AUTHN_LEVEL_CONNECT, DCE_C_RPC_AUTHN_PROTOCOL_GSS_KERBEROS, &gss_kerb_auth_connect_fns); register_dcerpc_auth_subdissector(DCE_C_AUTHN_LEVEL_PKT_INTEGRITY, DCE_C_RPC_AUTHN_PROTOCOL_GSS_KERBEROS, &gss_kerb_auth_sign_fns); register_dcerpc_auth_subdissector(DCE_C_AUTHN_LEVEL_PKT_PRIVACY, DCE_C_RPC_AUTHN_PROTOCOL_GSS_KERBEROS, &gss_kerb_auth_seal_fns); } /* * Editor modelines - https://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 8 * tab-width: 8 * indent-tabs-mode: t * End: * * vi: set shiftwidth=8 tabstop=8 noexpandtab: * :indentSize=8:tabSize=8:noTabs=false: */