forked from osmocom/wireshark
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Change-Id: I36b2731d67f9345d2fd0c23800bba7d2be94c387 Reviewed-on: https://code.wireshark.org/review/6008 Reviewed-by: Bill Meier <wmeier@newsguy.com>
509 lines
14 KiB
C
509 lines
14 KiB
C
/* packet-pkcs12.c
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* Routines for PKCS#12: Personal Information Exchange packet dissection
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* Graeme Lunt 2006
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*
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* See "PKCS #12 v1.1: Personal Information Exchange Syntax":
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*
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* http://www.emc.com/emc-plus/rsa-labs/pkcs/files/h11301-wp-pkcs-12v1-1-personal-information-exchange-syntax.pdf
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#include <epan/packet.h>
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#include <epan/expert.h>
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#include <epan/oids.h>
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#include <epan/asn1.h>
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#include <epan/prefs.h>
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#include "packet-ber.h"
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#include "packet-pkcs12.h"
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#include "packet-x509af.h"
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#include "packet-x509if.h"
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#include "packet-cms.h"
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#ifdef HAVE_LIBGCRYPT
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#include <wsutil/wsgcrypt.h>
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#endif
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#define PNAME "PKCS#12: Personal Information Exchange"
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#define PSNAME "PKCS12"
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#define PFNAME "pkcs12"
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#define PKCS12_PBE_ARCFOUR_SHA1_OID "1.2.840.113549.1.12.1.1"
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#define PKCS12_PBE_3DES_SHA1_OID "1.2.840.113549.1.12.1.3"
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#define PKCS12_PBE_RC2_40_SHA1_OID "1.2.840.113549.1.12.1.6"
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void proto_register_pkcs12(void);
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void proto_reg_handoff_pkcs12(void);
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/* Initialize the protocol and registered fields */
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static int proto_pkcs12 = -1;
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static int hf_pkcs12_X509Certificate_PDU = -1;
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static gint ett_decrypted_pbe = -1;
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static expert_field ei_pkcs12_octet_string_expected = EI_INIT;
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static const char *object_identifier_id = NULL;
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static int iteration_count = 0;
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static tvbuff_t *salt = NULL;
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static const char *password = NULL;
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static gboolean try_null_password = FALSE;
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static void dissect_AuthenticatedSafe_OCTETSTRING_PDU(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static void dissect_SafeContents_OCTETSTRING_PDU(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int dissect_PrivateKeyInfo_PDU(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data);
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#include "packet-pkcs12-hf.c"
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/* Initialize the subtree pointers */
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#include "packet-pkcs12-ett.c"
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static void append_oid(proto_tree *tree, const char *oid)
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{
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const char *name = NULL;
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name = oid_resolved_from_string(oid);
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proto_item_append_text(tree, " (%s)", name ? name : oid);
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}
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#ifdef HAVE_LIBGCRYPT
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static int
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generate_key_or_iv(unsigned int id, tvbuff_t *salt_tvb, unsigned int iter,
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const char *pw, unsigned int req_keylen, char * keybuf)
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{
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int rc;
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unsigned int i, j;
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gcry_md_hd_t md;
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gcry_mpi_t num_b1 = NULL;
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size_t pwlen;
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char hash[20], buf_b[64], buf_i[128], *p;
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char *salt_p;
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int salt_size;
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size_t cur_keylen;
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size_t n;
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gcry_error_t err;
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cur_keylen = 0;
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salt_size = tvb_captured_length(salt_tvb);
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salt_p = (char *)tvb_memdup(wmem_packet_scope(), salt_tvb, 0, salt_size);
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if (pw == NULL)
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pwlen = 0;
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else
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pwlen = strlen (pw);
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if (pwlen > 63 / 2)
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{
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return FALSE;
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}
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/* Store salt and password in BUF_I */
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p = buf_i;
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for (i = 0; i < 64; i++)
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*p++ = salt_p[i % salt_size];
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if (pw)
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{
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for (i = j = 0; i < 64; i += 2)
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{
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*p++ = 0;
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*p++ = pw[j];
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if (++j > pwlen) /* Note, that we include the trailing zero */
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j = 0;
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}
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}
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else
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memset (p, 0, 64);
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for (;;) {
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err = gcry_md_open(&md, GCRY_MD_SHA1, 0);
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if (gcry_err_code(err))
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{
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return FALSE;
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}
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for (i = 0; i < 64; i++)
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{
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unsigned char lid = id & 0xFF;
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gcry_md_write (md, &lid, 1);
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}
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gcry_md_write(md, buf_i, pw ? 128 : 64);
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gcry_md_final (md);
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memcpy (hash, gcry_md_read (md, 0), 20);
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gcry_md_close (md);
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for (i = 1; i < iter; i++)
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gcry_md_hash_buffer (GCRY_MD_SHA1, hash, hash, 20);
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for (i = 0; i < 20 && cur_keylen < req_keylen; i++)
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keybuf[cur_keylen++] = hash[i];
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if (cur_keylen == req_keylen)
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{
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gcry_mpi_release (num_b1);
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return TRUE; /* ready */
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}
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/* need more bytes. */
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for (i = 0; i < 64; i++)
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buf_b[i] = hash[i % 20];
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n = 64;
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rc = gcry_mpi_scan (&num_b1, GCRYMPI_FMT_USG, buf_b, n, &n);
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if (rc != 0)
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{
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return FALSE;
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}
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gcry_mpi_add_ui (num_b1, num_b1, 1);
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for (i = 0; i < 128; i += 64)
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{
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gcry_mpi_t num_ij;
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n = 64;
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rc = gcry_mpi_scan (&num_ij, GCRYMPI_FMT_USG, buf_i + i, n, &n);
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if (rc != 0)
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{
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return FALSE;
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}
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gcry_mpi_add (num_ij, num_ij, num_b1);
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gcry_mpi_clear_highbit (num_ij, 64 * 8);
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n = 64;
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rc = gcry_mpi_print (GCRYMPI_FMT_USG, buf_i + i, n, &n, num_ij);
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if (rc != 0)
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{
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return FALSE;
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}
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gcry_mpi_release (num_ij);
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}
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}
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}
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#endif
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void PBE_reset_parameters(void)
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{
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iteration_count = 0;
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salt = NULL;
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}
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int PBE_decrypt_data(const char *object_identifier_id_param, tvbuff_t *encrypted_tvb, asn1_ctx_t *actx, proto_item *item)
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{
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#ifdef HAVE_LIBGCRYPT
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const char *encryption_algorithm;
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gcry_cipher_hd_t cipher;
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gcry_error_t err;
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int algo;
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int mode;
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int ivlen = 0;
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int keylen = 0;
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int datalen = 0;
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char *key = NULL;
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char *iv = NULL;
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char *clear_data = NULL;
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tvbuff_t *clear_tvb = NULL;
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const gchar *oidname;
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GString *name;
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proto_tree *tree;
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char byte;
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gboolean decrypt_ok = TRUE;
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if(((password == NULL) || (*password == '\0')) && (try_null_password == FALSE)) {
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/* we are not configured to decrypt */
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return FALSE;
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}
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encryption_algorithm = x509af_get_last_algorithm_id();
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/* these are the only encryption schemes we understand for now */
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if(!strcmp(encryption_algorithm, PKCS12_PBE_3DES_SHA1_OID)) {
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ivlen = 8;
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keylen = 24;
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algo = GCRY_CIPHER_3DES;
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mode = GCRY_CIPHER_MODE_CBC;
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} else if(!strcmp(encryption_algorithm, PKCS12_PBE_ARCFOUR_SHA1_OID)) {
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ivlen = 0;
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keylen = 16;
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algo = GCRY_CIPHER_ARCFOUR;
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mode = GCRY_CIPHER_MODE_NONE;
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} else if(!strcmp(encryption_algorithm, PKCS12_PBE_RC2_40_SHA1_OID)) {
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ivlen = 8;
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keylen = 5;
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algo = GCRY_CIPHER_RFC2268_40;
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mode = GCRY_CIPHER_MODE_CBC;
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} else {
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/* we don't know how to decrypt this */
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proto_item_append_text(item, " [Unsupported encryption algorithm]");
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return FALSE;
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}
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if((iteration_count == 0) || (salt == NULL)) {
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proto_item_append_text(item, " [Insufficient parameters]");
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return FALSE;
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}
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/* allocate buffers */
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key = (char *)wmem_alloc(wmem_packet_scope(), keylen);
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if(!generate_key_or_iv(1 /*LEY */, salt, iteration_count, password, keylen, key))
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return FALSE;
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if(ivlen) {
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iv = (char *)wmem_alloc(wmem_packet_scope(), ivlen);
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if(!generate_key_or_iv(2 /* IV */, salt, iteration_count, password, ivlen, iv))
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return FALSE;
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}
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/* now try an internal function */
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err = gcry_cipher_open(&cipher, algo, mode, 0);
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if (gcry_err_code (err))
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return FALSE;
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err = gcry_cipher_setkey (cipher, key, keylen);
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if (gcry_err_code (err)) {
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gcry_cipher_close (cipher);
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return FALSE;
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}
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if(ivlen) {
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err = gcry_cipher_setiv (cipher, iv, ivlen);
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if (gcry_err_code (err)) {
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gcry_cipher_close (cipher);
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return FALSE;
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}
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}
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datalen = tvb_captured_length(encrypted_tvb);
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clear_data = (char *)g_malloc(datalen);
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err = gcry_cipher_decrypt (cipher, clear_data, datalen, (char *)tvb_memdup(wmem_packet_scope(), encrypted_tvb, 0, datalen), datalen);
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if (gcry_err_code (err)) {
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proto_item_append_text(item, " [Failed to decrypt with password preference]");
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gcry_cipher_close (cipher);
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g_free(clear_data);
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return FALSE;
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}
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gcry_cipher_close (cipher);
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/* We don't know if we have successfully decrypted the data or not so we:
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a) check the trailing bytes
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b) see if we start with a sequence or a set (is this too constraining?
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*/
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/* first the trailing bytes */
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byte = clear_data[datalen-1];
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if(byte <= 0x08) {
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int i;
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for(i = (int)byte; i > 0 ; i--) {
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if(clear_data[datalen - i] != byte) {
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decrypt_ok = FALSE;
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break;
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}
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}
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} else {
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/* XXX: is this a failure? */
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}
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/* we assume the result is ASN.1 - check it is a SET or SEQUENCE */
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byte = clear_data[0];
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if((byte != 0x30) && (byte != 0x31)) { /* do we need more here? OCTET STRING? */
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decrypt_ok = FALSE;
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}
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if(!decrypt_ok) {
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g_free(clear_data);
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proto_item_append_text(item, " [Failed to decrypt with supplied password]");
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return FALSE;
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}
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proto_item_append_text(item, " [Decrypted successfully]");
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tree = proto_item_add_subtree(item, ett_decrypted_pbe);
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/* OK - so now clear_data contains the decrypted data */
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clear_tvb = tvb_new_child_real_data(encrypted_tvb,(const guint8 *)clear_data, datalen, datalen);
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tvb_set_free_cb(clear_tvb, g_free);
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name = g_string_new("");
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oidname = oid_resolved_from_string(object_identifier_id_param);
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g_string_printf(name, "Decrypted %s", oidname ? oidname : object_identifier_id_param);
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/* add it as a new source */
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add_new_data_source(actx->pinfo, clear_tvb, name->str);
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g_string_free(name, TRUE);
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/* now try and decode it */
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call_ber_oid_callback(object_identifier_id_param, clear_tvb, 0, actx->pinfo, tree, NULL);
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return TRUE;
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#else
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/* we cannot decrypt */
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return FALSE;
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#endif
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}
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#include "packet-pkcs12-fn.c"
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static int strip_octet_string(tvbuff_t *tvb)
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{
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gint8 ber_class;
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gboolean pc, ind;
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gint32 tag;
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guint32 len;
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int offset = 0;
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/* PKCS#7 encodes the content as OCTET STRING, whereas CMS is just any ANY */
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/* if we use CMS (rather than PKCS#7) - which we are - we need to strip the OCTET STRING tag */
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/* before proceeding */
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offset = get_ber_identifier(tvb, 0, &ber_class, &pc, &tag);
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offset = get_ber_length(tvb, offset, &len, &ind);
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if((ber_class == BER_CLASS_UNI) && (tag == BER_UNI_TAG_OCTETSTRING))
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return offset;
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return 0;
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}
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static void dissect_AuthenticatedSafe_OCTETSTRING_PDU(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
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int offset = 0;
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asn1_ctx_t asn1_ctx;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
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if((offset = strip_octet_string(tvb)) > 0)
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dissect_pkcs12_AuthenticatedSafe(FALSE, tvb, offset, &asn1_ctx, tree, hf_pkcs12_AuthenticatedSafe_PDU);
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else
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proto_tree_add_expert(tree, pinfo, &ei_pkcs12_octet_string_expected, tvb, 0, 1);
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}
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static void dissect_SafeContents_OCTETSTRING_PDU(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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asn1_ctx_t asn1_ctx;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
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offset = strip_octet_string(tvb);
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dissect_pkcs12_SafeContents(FALSE, tvb, offset, &asn1_ctx, tree, hf_pkcs12_SafeContents_PDU);
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}
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static void dissect_X509Certificate_OCTETSTRING_PDU(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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asn1_ctx_t asn1_ctx;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
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if((offset = strip_octet_string(tvb)) > 0)
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dissect_x509af_Certificate(FALSE, tvb, offset, &asn1_ctx, tree, hf_pkcs12_X509Certificate_PDU);
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else
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proto_tree_add_expert(tree, pinfo, &ei_pkcs12_octet_string_expected, tvb, 0, 1);
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}
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/*--- proto_register_pkcs12 ----------------------------------------------*/
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void proto_register_pkcs12(void) {
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/* List of fields */
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static hf_register_info hf[] = {
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{ &hf_pkcs12_X509Certificate_PDU,
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{ "X509Certificate", "pkcs12.X509Certificate",
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FT_NONE, BASE_NONE, NULL, 0,
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"pkcs12.X509Certificate", HFILL }},
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#include "packet-pkcs12-hfarr.c"
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};
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/* List of subtrees */
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static gint *ett[] = {
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&ett_decrypted_pbe,
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#include "packet-pkcs12-ettarr.c"
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};
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static ei_register_info ei[] = {
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{ &ei_pkcs12_octet_string_expected, { "pkcs12.octet_string_expected", PI_PROTOCOL, PI_WARN, "BER Error: OCTET STRING expected", EXPFILL }},
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};
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module_t *pkcs12_module;
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expert_module_t* expert_pkcs12;
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/* Register protocol */
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proto_pkcs12 = proto_register_protocol(PNAME, PSNAME, PFNAME);
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/* Register fields and subtrees */
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proto_register_field_array(proto_pkcs12, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_pkcs12 = expert_register_protocol(proto_pkcs12);
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expert_register_field_array(expert_pkcs12, ei, array_length(ei));
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/* Register preferences */
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pkcs12_module = prefs_register_protocol(proto_pkcs12, NULL);
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prefs_register_string_preference(pkcs12_module, "password",
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"Password to decrypt the file with",
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"The password to used to decrypt the encrypted elements within"
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" the PKCS#12 file", &password);
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prefs_register_bool_preference(pkcs12_module, "try_null_password",
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"Try to decrypt with a empty password",
|
|
"Whether to try and decrypt the encrypted data within the"
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|
" PKCS#12 with a NULL password", &try_null_password);
|
|
|
|
new_register_ber_syntax_dissector("PKCS#12", proto_pkcs12, dissect_PFX_PDU);
|
|
register_ber_oid_syntax(".p12", NULL, "PKCS#12");
|
|
register_ber_oid_syntax(".pfx", NULL, "PKCS#12");
|
|
}
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|
|
|
|
|
/*--- proto_reg_handoff_pkcs12 -------------------------------------------*/
|
|
void proto_reg_handoff_pkcs12(void) {
|
|
#include "packet-pkcs12-dis-tab.c"
|
|
|
|
register_ber_oid_dissector("1.2.840.113549.1.9.22.1", dissect_X509Certificate_OCTETSTRING_PDU, proto_pkcs12, "x509Certificate");
|
|
|
|
}
|
|
|