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strongswan/src/scepclient/scepclient.c

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/*
* Copyright (C) 2012 Tobias Brunner
* Copyright (C) 2005 Jan Hutter, Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <ctype.h>
#include <unistd.h>
#include <time.h>
#include <limits.h>
#include <syslog.h>
#include <errno.h>
#include <library.h>
#include <utils/debug.h>
#include <asn1/asn1.h>
#include <asn1/oid.h>
#include <utils/optionsfrom.h>
#include <collections/enumerator.h>
#include <collections/linked_list.h>
#include <crypto/hashers/hasher.h>
#include <crypto/crypters/crypter.h>
#include <crypto/proposal/proposal_keywords.h>
#include <credentials/keys/private_key.h>
#include <credentials/keys/public_key.h>
#include <credentials/certificates/certificate.h>
#include <credentials/certificates/x509.h>
#include <credentials/certificates/pkcs10.h>
#include <credentials/sets/mem_cred.h>
#include <plugins/plugin.h>
#include "scep.h"
/*
* definition of some defaults
*/
/* some paths */
#define REQ_PATH IPSEC_CONFDIR "/ipsec.d/reqs"
#define HOST_CERT_PATH IPSEC_CONFDIR "/ipsec.d/certs"
#define CA_CERT_PATH IPSEC_CONFDIR "/ipsec.d/cacerts"
#define PRIVATE_KEY_PATH IPSEC_CONFDIR "/ipsec.d/private"
/* default name of DER-encoded PKCS#1 private key file */
#define DEFAULT_FILENAME_PKCS1 "myKey.der"
/* default name of DER-encoded PKCS#10 certificate request file */
#define DEFAULT_FILENAME_PKCS10 "myReq.der"
/* default name of DER-encoded PKCS#7 file */
#define DEFAULT_FILENAME_PKCS7 "pkcs7.der"
/* default name of DER-encoded self-signed X.509 certificate file */
#define DEFAULT_FILENAME_CERT_SELF "selfCert.der"
/* default name of DER-encoded X.509 certificate file */
#define DEFAULT_FILENAME_CERT "myCert.der"
/* default name of DER-encoded CA cert file used for key encipherment */
#define DEFAULT_FILENAME_CACERT_ENC "caCert.der"
/* default name of the der encoded CA cert file used for signature verification */
#define DEFAULT_FILENAME_CACERT_SIG "caCert.der"
/* default prefix of the der encoded CA certificates received from the SCEP server */
#define DEFAULT_FILENAME_PREFIX_CACERT "caCert.der"
/* default certificate validity */
#define DEFAULT_CERT_VALIDITY 5 * 3600 * 24 * 365 /* seconds */
/* default polling time interval in SCEP manual mode */
#define DEFAULT_POLL_INTERVAL 20 /* seconds */
/* default key length for self-generated RSA keys */
#define DEFAULT_RSA_KEY_LENGTH 2048 /* bits */
/* default distinguished name */
#define DEFAULT_DN "C=CH, O=Linux strongSwan, CN="
/* minimum RSA key size */
#define RSA_MIN_OCTETS (512 / BITS_PER_BYTE)
/* challenge password buffer size */
#define MAX_PASSWORD_LENGTH 256
/* Max length of filename for tempfile */
#define MAX_TEMP_FILENAME_LENGTH 256
/* current scepclient version */
static const char *scepclient_version = "1.0";
/* by default the CRL policy is lenient */
bool strict_crl_policy = FALSE;
/* by default pluto does not check crls dynamically */
long crl_check_interval = 0;
/* by default pluto logs out after every smartcard use */
bool pkcs11_keep_state = FALSE;
/* by default HTTP fetch timeout is 30s */
static u_int http_timeout = 30;
/* address to bind for HTTP fetches */
static char* http_bind = NULL;
/* options read by optionsfrom */
options_t *options;
/*
* Global variables
*/
chunk_t pkcs1;
chunk_t pkcs7;
chunk_t challengePassword;
chunk_t serialNumber;
chunk_t transID;
chunk_t fingerprint;
chunk_t encoding;
chunk_t pkcs10_encoding;
chunk_t issuerAndSubject;
chunk_t getCertInitial;
chunk_t scep_response;
linked_list_t *subjectAltNames;
identification_t *subject = NULL;
private_key_t *private_key = NULL;
public_key_t *public_key = NULL;
certificate_t *x509_signer = NULL;
certificate_t *x509_ca_enc = NULL;
certificate_t *x509_ca_sig = NULL;
certificate_t *pkcs10_req = NULL;
mem_cred_t *creds = NULL;
/* logging */
static bool log_to_stderr = TRUE;
static bool log_to_syslog = TRUE;
static level_t default_loglevel = 1;
/**
* logging function for scepclient
*/
static void scepclient_dbg(debug_t group, level_t level, char *fmt, ...)
{
char buffer[8192];
char *current = buffer, *next;
va_list args;
if (level <= default_loglevel)
{
if (log_to_stderr)
{
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
fprintf(stderr, "\n");
}
if (log_to_syslog)
{
/* write in memory buffer first */
va_start(args, fmt);
vsnprintf(buffer, sizeof(buffer), fmt, args);
va_end(args);
/* do a syslog with every line */
while (current)
{
next = strchr(current, '\n');
if (next)
{
*(next++) = '\0';
}
syslog(LOG_INFO, "%s\n", current);
current = next;
}
}
}
}
/**
* Initialize logging to stderr/syslog
*/
static void init_log(const char *program)
{
dbg = scepclient_dbg;
if (log_to_stderr)
{
setbuf(stderr, NULL);
}
if (log_to_syslog)
{
openlog(program, LOG_CONS | LOG_NDELAY | LOG_PID, LOG_AUTHPRIV);
}
}
/**
* join two paths if filename is not absolute
*/
static void join_paths(char *target, size_t target_size, char *parent,
char *filename)
{
if (*filename == '/' || *filename == '.')
{
snprintf(target, target_size, "%s", filename);
}
else
{
snprintf(target, target_size, "%s/%s", parent, filename);
}
}
/**
* add a suffix to a given filename, properly handling extensions like '.der'
*/
static void add_path_suffix(char *target, size_t target_size, char *filename,
char *suffix_fmt, ...)
{
char suffix[PATH_MAX], *start, *dot;
va_list args;
va_start(args, suffix_fmt);
vsnprintf(suffix, sizeof(suffix), suffix_fmt, args);
va_end(args);
start = strrchr(filename, '/');
start = start ?: filename;
dot = strrchr(start, '.');
if (!dot || dot == start || dot[1] == '\0')
{ /* no extension add suffix at the end */
snprintf(target, target_size, "%s%s", filename, suffix);
}
else
{ /* add the suffix between the filename and the extension */
snprintf(target, target_size, "%.*s%s%s", (int)(dot - filename),
filename, suffix, dot);
}
}
/**
* @brief exit scepclient
*
* @param status 0 = OK, 1 = general discomfort
*/
static void exit_scepclient(err_t message, ...)
{
int status = 0;
if (creds)
{
lib->credmgr->remove_set(lib->credmgr, &creds->set);
creds->destroy(creds);
}
DESTROY_IF(subject);
DESTROY_IF(private_key);
DESTROY_IF(public_key);
DESTROY_IF(x509_signer);
DESTROY_IF(x509_ca_enc);
DESTROY_IF(x509_ca_sig);
DESTROY_IF(pkcs10_req);
subjectAltNames->destroy_offset(subjectAltNames,
offsetof(identification_t, destroy));
free(pkcs1.ptr);
free(pkcs7.ptr);
free(serialNumber.ptr);
free(transID.ptr);
free(fingerprint.ptr);
free(encoding.ptr);
free(pkcs10_encoding.ptr);
free(issuerAndSubject.ptr);
free(getCertInitial.ptr);
free(scep_response.ptr);
options->destroy(options);
/* print any error message to stderr */
if (message != NULL && *message != '\0')
{
va_list args;
char m[8192];
va_start(args, message);
vsnprintf(m, sizeof(m), message, args);
va_end(args);
fprintf(stderr, "error: %s\n", m);
status = -1;
}
library_deinit();
exit(status);
}
/**
* @brief prints the program version and exits
*
*/
static void version(void)
{
printf("scepclient %s\n", scepclient_version);
exit_scepclient(NULL);
}
/**
* @brief prints the usage of the program to the stderr output
*
* If message is set, program is exitet with 1 (error)
* @param message message in case of an error
*/
static void usage(const char *message)
{
fprintf(stderr,
"Usage: scepclient\n"
" --help (-h) show usage and exit\n"
" --version (-v) show version and exit\n"
" --quiet (-q) do not write log output to stderr\n"
" --in (-i) <type>[=<filename>] use <filename> of <type> for input\n"
" <type> = pkcs1 | pkcs10 | cert-self\n"
" cacert-enc | cacert-sig\n"
" - if no pkcs1 input is defined, an RSA\n"
" key will be generated\n"
" - if no pkcs10 input is defined, a\n"
" PKCS#10 request will be generated\n"
" - if no cert-self input is defined, a\n"
" self-signed certificate will be generated\n"
" - if no filename is given, default is used\n"
" --out (-o) <type>[=<filename>] write output of <type> to <filename>\n"
" multiple outputs are allowed\n"
" <type> = pkcs1 | pkcs10 | pkcs7 | cert-self |\n"
" cert | cacert\n"
" - type cacert defines filename prefix of\n"
" received CA certificate(s)\n"
" - if no filename is given, default is used\n"
" --optionsfrom (-+) <filename> reads additional options from given file\n"
" --force (-f) force existing file(s)\n"
" --httptimeout (-T) timeout for HTTP operations (default: 30s)\n"
" --bind (-b) source address to bind for HTTP operations\n"
"\n"
"Options for key generation (pkcs1):\n"
" --keylength (-k) <bits> key length for RSA key generation\n"
" (default: 2048 bits)\n"
"\n"
"Options for validity:\n"
" --days (-D) <days> validity in days\n"
" --startdate (-S) <YYMMDDHHMMSS>Z not valid before date\n"
" --enddate (-E) <YYMMDDHHMMSS>Z not valid after date\n"
"\n"
"Options for request generation (pkcs10):\n"
" --dn (-d) <dn> comma separated list of distinguished names\n"
" --subjectAltName (-s) <t>=<v> include subjectAltName in certificate request\n"
" <t> = email | dns | ip \n"
" --password (-p) <pw> challenge password\n"
" - use '%%prompt' as pw for a password prompt\n"
" --algorithm (-a) [<type>=]<algo> algorithm to be used for PKCS#7 encryption,\n"
" PKCS#7 digest or PKCS#10 signature\n"
" <type> = enc | dgst | sig\n"
" - if no type is given enc is assumed\n"
" <algo> = des (default) | 3des | aes128 |\n"
" aes192 | aes256 | camellia128 |\n"
" camellia192 | camellia256\n"
" <algo> = md5 (default) | sha1 | sha256 |\n"
" sha384 | sha512\n"
"\n"
"Options for CA certificate acquisition:\n"
" --caname (-c) <name> name of CA to fetch CA certificate(s)\n"
" (default: CAIdentifier)\n"
"Options for enrollment (cert):\n"
" --url (-u) <url> url of the SCEP server\n"
" --method (-m) post | get http request type\n"
" --interval (-t) <seconds> poll interval in seconds (default 20s)\n"
" --maxpolltime (-x) <seconds> max poll time in seconds when in manual mode\n"
" (default: unlimited)\n"
"\n"
"Debugging output:\n"
" --debug (-l) <level> changes the log level (-1..4, default: 1)\n"
);
exit_scepclient(message);
}
/**
* @brief main of scepclient
*
* @param argc number of arguments
* @param argv pointer to the argument values
*/
int main(int argc, char **argv)
{
/* external values */
extern char * optarg;
extern int optind;
/* type of input and output files */
typedef enum {
PKCS1 = 0x01,
PKCS10 = 0x02,
PKCS7 = 0x04,
CERT_SELF = 0x08,
CERT = 0x10,
CACERT_ENC = 0x20,
CACERT_SIG = 0x40,
} scep_filetype_t;
/* filetype to read from, defaults to "generate a key" */
scep_filetype_t filetype_in = 0;
/* filetype to write to, no default here */
scep_filetype_t filetype_out = 0;
/* input files */
char *file_in_pkcs1 = DEFAULT_FILENAME_PKCS1;
char *file_in_pkcs10 = DEFAULT_FILENAME_PKCS10;
char *file_in_cert_self = DEFAULT_FILENAME_CERT_SELF;
char *file_in_cacert_enc = DEFAULT_FILENAME_CACERT_ENC;
char *file_in_cacert_sig = DEFAULT_FILENAME_CACERT_SIG;
/* output files */
char *file_out_pkcs1 = DEFAULT_FILENAME_PKCS1;
char *file_out_pkcs10 = DEFAULT_FILENAME_PKCS10;
char *file_out_pkcs7 = DEFAULT_FILENAME_PKCS7;
char *file_out_cert_self = DEFAULT_FILENAME_CERT_SELF;
char *file_out_cert = DEFAULT_FILENAME_CERT;
char *file_out_ca_cert = DEFAULT_FILENAME_CACERT_ENC;
/* by default user certificate is requested */
bool request_ca_certificate = FALSE;
/* by default existing files are not overwritten */
bool force = FALSE;
/* length of RSA key in bits */
u_int rsa_keylength = DEFAULT_RSA_KEY_LENGTH;
/* validity of self-signed certificate */
time_t validity = DEFAULT_CERT_VALIDITY;
time_t notBefore = 0;
time_t notAfter = 0;
/* distinguished name for requested certificate, ASCII format */
char *distinguishedName = NULL;
/* challenge password */
char challenge_password_buffer[MAX_PASSWORD_LENGTH];
/* symmetric encryption algorithm used by pkcs7, default is DES */
encryption_algorithm_t pkcs7_symmetric_cipher = ENCR_DES;
size_t pkcs7_key_size = 0;
/* digest algorithm used by pkcs7, default is MD5 */
hash_algorithm_t pkcs7_digest_alg = HASH_MD5;
/* signature algorithm used by pkcs10, default is MD5 */
hash_algorithm_t pkcs10_signature_alg = HASH_MD5;
/* URL of the SCEP-Server */
char *scep_url = NULL;
/* Name of CA to fetch CA certs for */
char *ca_name = "CAIdentifier";
/* http request method, default is GET */
bool http_get_request = TRUE;
/* poll interval time in manual mode in seconds */
u_int poll_interval = DEFAULT_POLL_INTERVAL;
/* maximum poll time */
u_int max_poll_time = 0;
err_t ugh = NULL;
/* initialize library */
if (!library_init(NULL, "scepclient"))
{
library_deinit();
exit(SS_RC_LIBSTRONGSWAN_INTEGRITY);
}
if (lib->integrity &&
!lib->integrity->check_file(lib->integrity, "scepclient", argv[0]))
{
fprintf(stderr, "integrity check of scepclient failed\n");
library_deinit();
exit(SS_RC_DAEMON_INTEGRITY);
}
/* initialize global variables */
pkcs1 = chunk_empty;
pkcs7 = chunk_empty;
serialNumber = chunk_empty;
transID = chunk_empty;
fingerprint = chunk_empty;
encoding = chunk_empty;
pkcs10_encoding = chunk_empty;
issuerAndSubject = chunk_empty;
challengePassword = chunk_empty;
getCertInitial = chunk_empty;
scep_response = chunk_empty;
subjectAltNames = linked_list_create();
options = options_create();
for (;;)
{
static const struct option long_opts[] = {
/* name, has_arg, flag, val */
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'v' },
{ "optionsfrom", required_argument, NULL, '+' },
{ "quiet", no_argument, NULL, 'q' },
{ "debug", required_argument, NULL, 'l' },
{ "in", required_argument, NULL, 'i' },
{ "out", required_argument, NULL, 'o' },
{ "force", no_argument, NULL, 'f' },
{ "httptimeout", required_argument, NULL, 'T' },
{ "bind", required_argument, NULL, 'b' },
{ "keylength", required_argument, NULL, 'k' },
{ "dn", required_argument, NULL, 'd' },
{ "days", required_argument, NULL, 'D' },
{ "startdate", required_argument, NULL, 'S' },
{ "enddate", required_argument, NULL, 'E' },
{ "subjectAltName", required_argument, NULL, 's' },
{ "password", required_argument, NULL, 'p' },
{ "algorithm", required_argument, NULL, 'a' },
{ "url", required_argument, NULL, 'u' },
{ "caname", required_argument, NULL, 'c'},
{ "method", required_argument, NULL, 'm' },
{ "interval", required_argument, NULL, 't' },
{ "maxpolltime", required_argument, NULL, 'x' },
{ 0,0,0,0 }
};
/* parse next option */
int c = getopt_long(argc, argv, "hv+:qi:o:fk:d:s:p:a:u:c:m:t:x:APRCMS", long_opts, NULL);
switch (c)
{
case EOF: /* end of flags */
break;
case 'h': /* --help */
usage(NULL);
case 'v': /* --version */
version();
case 'q': /* --quiet */
log_to_stderr = FALSE;
continue;
case 'l': /* --debug <level> */
default_loglevel = atoi(optarg);
continue;
case 'i': /* --in <type> [= <filename>] */
{
char *filename = strstr(optarg, "=");
if (filename)
{
/* replace '=' by '\0' */
*filename = '\0';
/* set pointer to start of filename */
filename++;
}
if (strcaseeq("pkcs1", optarg))
{
filetype_in |= PKCS1;
if (filename)
file_in_pkcs1 = filename;
}
else if (strcaseeq("pkcs10", optarg))
{
filetype_in |= PKCS10;
if (filename)
file_in_pkcs10 = filename;
}
else if (strcaseeq("cacert-enc", optarg))
{
filetype_in |= CACERT_ENC;
if (filename)
file_in_cacert_enc = filename;
}
else if (strcaseeq("cacert-sig", optarg))
{
filetype_in |= CACERT_SIG;
if (filename)
file_in_cacert_sig = filename;
}
else if (strcaseeq("cert-self", optarg))
{
filetype_in |= CERT_SELF;
if (filename)
file_in_cert_self = filename;
}
else
{
usage("invalid --in file type");
}
continue;
}
case 'o': /* --out <type> [= <filename>] */
{
char *filename = strstr(optarg, "=");
if (filename)
{
/* replace '=' by '\0' */
*filename = '\0';
/* set pointer to start of filename */
filename++;
}
if (strcaseeq("pkcs1", optarg))
{
filetype_out |= PKCS1;
if (filename)
file_out_pkcs1 = filename;
}
else if (strcaseeq("pkcs10", optarg))
{
filetype_out |= PKCS10;
if (filename)
file_out_pkcs10 = filename;
}
else if (strcaseeq("pkcs7", optarg))
{
filetype_out |= PKCS7;
if (filename)
file_out_pkcs7 = filename;
}
else if (strcaseeq("cert-self", optarg))
{
filetype_out |= CERT_SELF;
if (filename)
file_out_cert_self = filename;
}
else if (strcaseeq("cert", optarg))
{
filetype_out |= CERT;
if (filename)
file_out_cert = filename;
}
else if (strcaseeq("cacert", optarg))
{
request_ca_certificate = TRUE;
if (filename)
file_out_ca_cert = filename;
}
else
{
usage("invalid --out file type");
}
continue;
}
case 'f': /* --force */
force = TRUE;
continue;
case 'T': /* --httptimeout */
http_timeout = atoi(optarg);
if (http_timeout <= 0)
{
usage("invalid httptimeout specified");
}
continue;
case 'b': /* --bind */
http_bind = optarg;
continue;
case '+': /* --optionsfrom <filename> */
if (!options->from(options, optarg, &argc, &argv, optind))
{
exit_scepclient("optionsfrom failed");
}
continue;
case 'k': /* --keylength <length> */
{
div_t q;
rsa_keylength = atoi(optarg);
if (rsa_keylength == 0)
usage("invalid keylength");
/* check if key length is a multiple of 8 bits */
q = div(rsa_keylength, 2*BITS_PER_BYTE);
if (q.rem != 0)
{
exit_scepclient("keylength is not a multiple of %d bits!"
, 2*BITS_PER_BYTE);
}
continue;
}
case 'D': /* --days */
if (optarg == NULL || !isdigit(optarg[0]))
{
usage("missing number of days");
}
else
{
char *endptr;
long days = strtol(optarg, &endptr, 0);
if (*endptr != '\0' || endptr == optarg
|| days <= 0)
usage("<days> must be a positive number");
validity = 24*3600*days;
}
continue;
case 'S': /* --startdate */
if (optarg == NULL || strlen(optarg) != 13 || optarg[12] != 'Z')
{
usage("date format must be YYMMDDHHMMSSZ");
}
else
{
chunk_t date = { optarg, 13 };
notBefore = asn1_to_time(&date, ASN1_UTCTIME);
}
continue;
case 'E': /* --enddate */
if (optarg == NULL || strlen(optarg) != 13 || optarg[12] != 'Z')
{
usage("date format must be YYMMDDHHMMSSZ");
}
else
{
chunk_t date = { optarg, 13 };
notAfter = asn1_to_time(&date, ASN1_UTCTIME);
}
continue;
case 'd': /* --dn */
if (distinguishedName)
{
usage("only one distinguished name allowed");
}
distinguishedName = optarg;
continue;
case 's': /* --subjectAltName */
{
char *value = strstr(optarg, "=");
if (value)
{
/* replace '=' by '\0' */
*value = '\0';
/* set pointer to start of value */
value++;
}
if (strcaseeq("email", optarg) ||
strcaseeq("dns", optarg) ||
strcaseeq("ip", optarg))
{
subjectAltNames->insert_last(subjectAltNames,
identification_create_from_string(value));
continue;
}
else
{
usage("invalid --subjectAltName type");
continue;
}
}
case 'p': /* --password */
if (challengePassword.len > 0)
{
usage("only one challenge password allowed");
}
if (strcaseeq("%prompt", optarg))
{
printf("Challenge password: ");
if (fgets(challenge_password_buffer,
sizeof(challenge_password_buffer) - 1, stdin))
{
challengePassword.ptr = challenge_password_buffer;
/* discard the terminating '\n' from the input */
challengePassword.len = strlen(challenge_password_buffer) - 1;
}
else
{
usage("challenge password could not be read");
}
}
else
{
challengePassword.ptr = optarg;
challengePassword.len = strlen(optarg);
}
continue;
case 'u': /* -- url */
if (scep_url)
{
usage("only one URL argument allowed");
}
scep_url = optarg;
continue;
case 'c': /* -- caname */
ca_name = optarg;
continue;
case 'm': /* --method */
if (strcaseeq("get", optarg))
{
http_get_request = TRUE;
}
else if (strcaseeq("post", optarg))
{
http_get_request = FALSE;
}
else
{
usage("invalid http request method specified");
}
continue;
case 't': /* --interval */
poll_interval = atoi(optarg);
if (poll_interval <= 0)
{
usage("invalid interval specified");
}
continue;
case 'x': /* --maxpolltime */
max_poll_time = atoi(optarg);
continue;
case 'a': /*--algorithm [<type>=]algo */
{
const proposal_token_t *token;
char *type = optarg;
char *algo = strstr(optarg, "=");
if (algo)
{
*algo = '\0';
algo++;
}
else
{
type = "enc";
algo = optarg;
}
if (strcaseeq("enc", type))
{
token = lib->proposal->get_token(lib->proposal, algo);
if (token == NULL || token->type != ENCRYPTION_ALGORITHM)
{
usage("invalid algorithm specified");
}
pkcs7_symmetric_cipher = token->algorithm;
pkcs7_key_size = token->keysize;
if (encryption_algorithm_to_oid(token->algorithm,
token->keysize) == OID_UNKNOWN)
{
usage("unsupported encryption algorithm specified");
}
}
else if (strcaseeq("dgst", type) ||
strcaseeq("sig", type))
{
hash_algorithm_t hash;
token = lib->proposal->get_token(lib->proposal, algo);
if (token == NULL || token->type != INTEGRITY_ALGORITHM)
{
usage("invalid algorithm specified");
}
hash = hasher_algorithm_from_integrity(token->algorithm,
NULL);
if (hash == OID_UNKNOWN)
{
usage("invalid algorithm specified");
}
if (strcaseeq("dgst", type))
{
pkcs7_digest_alg = hash;
}
else
{
pkcs10_signature_alg = hash;
}
}
else
{
usage("invalid --algorithm type");
}
continue;
}
default:
usage("unknown option");
}
/* break from loop */
break;
}
init_log("scepclient");
/* load plugins, further infrastructure may need it */
if (!lib->plugins->load(lib->plugins,
lib->settings->get_str(lib->settings, "scepclient.load", PLUGINS)))
{
exit_scepclient("plugin loading failed");
}
lib->plugins->status(lib->plugins, LEVEL_DIAG);
if ((filetype_out == 0) && (!request_ca_certificate))
{
usage("--out filetype required");
}
if (request_ca_certificate && (filetype_out > 0 || filetype_in > 0))
{
usage("in CA certificate request, no other --in or --out option allowed");
}
/* check if url is given, if cert output defined */
if (((filetype_out & CERT) || request_ca_certificate) && !scep_url)
{
usage("URL of SCEP server required");
}
/* check for sanity of --in/--out */
if (!filetype_in && (filetype_in > filetype_out))
{
usage("cannot generate --out of given --in!");
}
/* get CA cert */
if (request_ca_certificate)
{
char ca_path[PATH_MAX];
container_t *container;
pkcs7_t *pkcs7;
if (!scep_http_request(scep_url, chunk_create(ca_name, strlen(ca_name)),
SCEP_GET_CA_CERT, http_get_request,
http_timeout, http_bind, &scep_response))
{
exit_scepclient("did not receive a valid scep response");
}
join_paths(ca_path, sizeof(ca_path), CA_CERT_PATH, file_out_ca_cert);
pkcs7 = lib->creds->create(lib->creds, CRED_CONTAINER, CONTAINER_PKCS7,
BUILD_BLOB_ASN1_DER, scep_response, BUILD_END);
if (!pkcs7)
{ /* no PKCS#7 encoded CA+RA certificates, assume simple CA cert */
DBG1(DBG_APP, "unable to parse PKCS#7, assuming plain CA cert");
if (!chunk_write(scep_response, ca_path, 0022, force))
{
exit_scepclient("could not write ca cert file '%s': %s",
ca_path, strerror(errno));
}
}
else
{
enumerator_t *enumerator;
certificate_t *cert;
int ra_certs = 0, ca_certs = 0;
int ra_index = 1, ca_index = 1;
enumerator = pkcs7->create_cert_enumerator(pkcs7);
while (enumerator->enumerate(enumerator, &cert))
{
x509_t *x509 = (x509_t*)cert;
if (x509->get_flags(x509) & X509_CA)
{
ca_certs++;
}
else
{
ra_certs++;
}
}
enumerator->destroy(enumerator);
enumerator = pkcs7->create_cert_enumerator(pkcs7);
while (enumerator->enumerate(enumerator, &cert))
{
x509_t *x509 = (x509_t*)cert;
bool ca_cert = x509->get_flags(x509) & X509_CA;
char cert_path[PATH_MAX], *path = ca_path;
if (ca_cert && ca_certs > 1)
{
add_path_suffix(cert_path, sizeof(cert_path), ca_path,
"-%.1d", ca_index++);
path = cert_path;
}
else if (!ca_cert)
{ /* use CA name as base for RA certs */
if (ra_certs > 1)
{
add_path_suffix(cert_path, sizeof(cert_path), ca_path,
"-ra-%.1d", ra_index++);
}
else
{
add_path_suffix(cert_path, sizeof(cert_path), ca_path,
"-ra");
}
path = cert_path;
}
if (!cert->get_encoding(cert, CERT_ASN1_DER, &encoding) ||
!chunk_write(encoding, path, 0022, force))
{
exit_scepclient("could not write cert file '%s': %s",
path, strerror(errno));
}
chunk_free(&encoding);
}
enumerator->destroy(enumerator);
container = &pkcs7->container;
container->destroy(container);
}
exit_scepclient(NULL); /* no further output required */
}
creds = mem_cred_create();
lib->credmgr->add_set(lib->credmgr, &creds->set);
/*
* input of PKCS#1 file
*/
if (filetype_in & PKCS1) /* load an RSA key pair from file */
{
char path[PATH_MAX];
join_paths(path, sizeof(path), PRIVATE_KEY_PATH, file_in_pkcs1);
private_key = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, KEY_RSA,
BUILD_FROM_FILE, path, BUILD_END);
}
else /* generate an RSA key pair */
{
private_key = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, KEY_RSA,
BUILD_KEY_SIZE, rsa_keylength,
BUILD_END);
}
if (private_key == NULL)
{
exit_scepclient("no RSA private key available");
}
creds->add_key(creds, private_key->get_ref(private_key));
public_key = private_key->get_public_key(private_key);
/* check for minimum key length */
if (private_key->get_keysize(private_key) < RSA_MIN_OCTETS / BITS_PER_BYTE)
{
exit_scepclient("length of RSA key has to be at least %d bits",
RSA_MIN_OCTETS * BITS_PER_BYTE);
}
/*
* input of PKCS#10 file
*/
if (filetype_in & PKCS10)
{
char path[PATH_MAX];
join_paths(path, sizeof(path), REQ_PATH, file_in_pkcs10);
pkcs10_req = lib->creds->create(lib->creds, CRED_CERTIFICATE,
CERT_PKCS10_REQUEST, BUILD_FROM_FILE,
path, BUILD_END);
if (!pkcs10_req)
{
exit_scepclient("could not read certificate request '%s'", path);
}
subject = pkcs10_req->get_subject(pkcs10_req);
subject = subject->clone(subject);
}
else
{
if (distinguishedName == NULL)
{
char buf[BUF_LEN];
int n = sprintf(buf, DEFAULT_DN);
/* set the common name to the hostname */
if (gethostname(buf + n, BUF_LEN - n) || strlen(buf) == n)
{
exit_scepclient("no hostname defined, use "
"--dn <distinguished name> option");
}
distinguishedName = buf;
}
DBG2(DBG_APP, "dn: '%s'", distinguishedName);
subject = identification_create_from_string(distinguishedName);
if (subject->get_type(subject) != ID_DER_ASN1_DN)
{
exit_scepclient("parsing of distinguished name failed");
}
DBG2(DBG_APP, "building pkcs10 object:");
pkcs10_req = lib->creds->create(lib->creds, CRED_CERTIFICATE,
CERT_PKCS10_REQUEST,
BUILD_SIGNING_KEY, private_key,
BUILD_SUBJECT, subject,
BUILD_SUBJECT_ALTNAMES, subjectAltNames,
BUILD_CHALLENGE_PWD, challengePassword,
BUILD_DIGEST_ALG, pkcs10_signature_alg,
BUILD_END);
if (!pkcs10_req)
{
exit_scepclient("generating pkcs10 request failed");
}
}
pkcs10_req->get_encoding(pkcs10_req, CERT_ASN1_DER, &pkcs10_encoding);
fingerprint = scep_generate_pkcs10_fingerprint(pkcs10_encoding);
DBG1(DBG_APP, " fingerprint: %s", fingerprint.ptr);
/*
* output of PKCS#10 file
*/
if (filetype_out & PKCS10)
{
char path[PATH_MAX];
join_paths(path, sizeof(path), REQ_PATH, file_out_pkcs10);
if (!chunk_write(pkcs10_encoding, path, 0022, force))
{
exit_scepclient("could not write pkcs10 file '%s': %s",
path, strerror(errno));
}
filetype_out &= ~PKCS10; /* delete PKCS10 flag */
}
if (!filetype_out)
{
exit_scepclient(NULL); /* no further output required */
}
/*
* output of PKCS#1 file
*/
if (filetype_out & PKCS1)
{
char path[PATH_MAX];
join_paths(path, sizeof(path), PRIVATE_KEY_PATH, file_out_pkcs1);
DBG2(DBG_APP, "building pkcs1 object:");
if (!private_key->get_encoding(private_key, PRIVKEY_ASN1_DER, &pkcs1) ||
!chunk_write(pkcs1, path, 0066, force))
{
exit_scepclient("could not write pkcs1 file '%s': %s",
path, strerror(errno));
}
filetype_out &= ~PKCS1; /* delete PKCS1 flag */
}
if (!filetype_out)
{
exit_scepclient(NULL); /* no further output required */
}
scep_generate_transaction_id(public_key, &transID, &serialNumber);
DBG1(DBG_APP, " transaction ID: %.*s", (int)transID.len, transID.ptr);
/*
* read or generate self-signed X.509 certificate
*/
if (filetype_in & CERT_SELF)
{
char path[PATH_MAX];
join_paths(path, sizeof(path), HOST_CERT_PATH, file_in_cert_self);
x509_signer = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
BUILD_FROM_FILE, path, BUILD_END);
if (!x509_signer)
{
exit_scepclient("could not read certificate file '%s'", path);
}
}
else
{
notBefore = notBefore ? notBefore : time(NULL);
notAfter = notAfter ? notAfter : (notBefore + validity);
x509_signer = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
BUILD_SIGNING_KEY, private_key,
BUILD_PUBLIC_KEY, public_key,
BUILD_SUBJECT, subject,
BUILD_NOT_BEFORE_TIME, notBefore,
BUILD_NOT_AFTER_TIME, notAfter,
BUILD_SERIAL, serialNumber,
BUILD_SUBJECT_ALTNAMES, subjectAltNames,
BUILD_END);
if (!x509_signer)
{
exit_scepclient("generating certificate failed");
}
}
creds->add_cert(creds, TRUE, x509_signer->get_ref(x509_signer));
/*
* output of self-signed X.509 certificate file
*/
if (filetype_out & CERT_SELF)
{
char path[PATH_MAX];
join_paths(path, sizeof(path), HOST_CERT_PATH, file_out_cert_self);
if (!x509_signer->get_encoding(x509_signer, CERT_ASN1_DER, &encoding))
{
exit_scepclient("encoding certificate failed");
}
if (!chunk_write(encoding, path, 0022, force))
{
exit_scepclient("could not write self-signed cert file '%s': %s",
path, strerror(errno));
}
chunk_free(&encoding);
filetype_out &= ~CERT_SELF; /* delete CERT_SELF flag */
}
if (!filetype_out)
{
exit_scepclient(NULL); /* no further output required */
}
/*
* load ca encryption certificate
*/
{
char path[PATH_MAX];
join_paths(path, sizeof(path), CA_CERT_PATH, file_in_cacert_enc);
x509_ca_enc = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
BUILD_FROM_FILE, path, BUILD_END);
if (!x509_ca_enc)
{
exit_scepclient("could not load encryption cacert file '%s'", path);
}
}
/*
* input of PKCS#7 file
*/
if (filetype_in & PKCS7)
{
/* user wants to load a pkcs7 encrypted request
* operation is not yet supported!
* would require additional parsing of transaction-id
pkcs7 = pkcs7_read_from_file(file_in_pkcs7);
*/
}
else
{
DBG2(DBG_APP, "building pkcs7 request");
pkcs7 = scep_build_request(pkcs10_encoding,
transID, SCEP_PKCSReq_MSG, x509_ca_enc,
pkcs7_symmetric_cipher, pkcs7_key_size,
x509_signer, pkcs7_digest_alg, private_key);
if (!pkcs7.ptr)
{
exit_scepclient("failed to build pkcs7 request");
}
}
/*
* output pkcs7 encrypted and signed certificate request
*/
if (filetype_out & PKCS7)
{
char path[PATH_MAX];
join_paths(path, sizeof(path), REQ_PATH, file_out_pkcs7);
if (!chunk_write(pkcs7, path, 0022, force))
{
exit_scepclient("could not write pkcs7 file '%s': %s",
path, strerror(errno));
}
filetype_out &= ~PKCS7; /* delete PKCS7 flag */
}
if (!filetype_out)
{
exit_scepclient(NULL); /* no further output required */
}
/*
* output certificate fetch from SCEP server
*/
if (filetype_out & CERT)
{
bool stored = FALSE;
certificate_t *cert;
enumerator_t *enumerator;
char path[PATH_MAX];
time_t poll_start = 0;
pkcs7_t *p7;
container_t *container = NULL;
chunk_t chunk;
scep_attributes_t attrs = empty_scep_attributes;
join_paths(path, sizeof(path), CA_CERT_PATH, file_in_cacert_sig);
x509_ca_sig = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
BUILD_FROM_FILE, path, BUILD_END);
if (!x509_ca_sig)
{
exit_scepclient("could not load signature cacert file '%s'", path);
}
creds->add_cert(creds, TRUE, x509_ca_sig->get_ref(x509_ca_sig));
if (!scep_http_request(scep_url, pkcs7, SCEP_PKI_OPERATION,
http_get_request, http_timeout, http_bind, &scep_response))
{
exit_scepclient("did not receive a valid scep response");
}
ugh = scep_parse_response(scep_response, transID, &container, &attrs);
if (ugh != NULL)
{
exit_scepclient(ugh);
}
/* in case of manual mode, we are going into a polling loop */
if (attrs.pkiStatus == SCEP_PENDING)
{
identification_t *issuer = x509_ca_sig->get_subject(x509_ca_sig);
DBG1(DBG_APP, " scep request pending, polling every %d seconds",
poll_interval);
poll_start = time_monotonic(NULL);
issuerAndSubject = asn1_wrap(ASN1_SEQUENCE, "cc",
issuer->get_encoding(issuer),
subject->get_encoding(subject));
}
while (attrs.pkiStatus == SCEP_PENDING)
{
if (max_poll_time > 0 &&
(time_monotonic(NULL) - poll_start >= max_poll_time))
{
exit_scepclient("maximum poll time reached: %d seconds"
, max_poll_time);
}
DBG2(DBG_APP, "going to sleep for %d seconds", poll_interval);
sleep(poll_interval);
free(scep_response.ptr);
container->destroy(container);
DBG2(DBG_APP, "fingerprint: %.*s",
(int)fingerprint.len, fingerprint.ptr);
DBG2(DBG_APP, "transaction ID: %.*s",
(int)transID.len, transID.ptr);
chunk_free(&getCertInitial);
getCertInitial = scep_build_request(issuerAndSubject,
transID, SCEP_GetCertInitial_MSG, x509_ca_enc,
pkcs7_symmetric_cipher, pkcs7_key_size,
x509_signer, pkcs7_digest_alg, private_key);
if (!getCertInitial.ptr)
{
exit_scepclient("failed to build scep request");
}
if (!scep_http_request(scep_url, getCertInitial, SCEP_PKI_OPERATION,
http_get_request, http_timeout, http_bind, &scep_response))
{
exit_scepclient("did not receive a valid scep response");
}
ugh = scep_parse_response(scep_response, transID, &container, &attrs);
if (ugh != NULL)
{
exit_scepclient(ugh);
}
}
if (attrs.pkiStatus != SCEP_SUCCESS)
{
container->destroy(container);
exit_scepclient("reply status is not 'SUCCESS'");
}
if (!container->get_data(container, &chunk))
{
container->destroy(container);
exit_scepclient("extracting signed-data failed");
}
container->destroy(container);
/* decrypt enveloped-data container */
container = lib->creds->create(lib->creds,
CRED_CONTAINER, CONTAINER_PKCS7,
BUILD_BLOB_ASN1_DER, chunk,
BUILD_END);
free(chunk.ptr);
if (!container)
{
exit_scepclient("could not decrypt envelopedData");
}
if (!container->get_data(container, &chunk))
{
container->destroy(container);
exit_scepclient("extracting encrypted-data failed");
}
container->destroy(container);
/* parse signed-data container */
container = lib->creds->create(lib->creds,
CRED_CONTAINER, CONTAINER_PKCS7,
BUILD_BLOB_ASN1_DER, chunk,
BUILD_END);
free(chunk.ptr);
if (!container)
{
exit_scepclient("could not parse singed-data");
}
/* no need to verify the signed-data container, the signature does NOT
* cover the contained certificates */
/* store the end entity certificate */
join_paths(path, sizeof(path), HOST_CERT_PATH, file_out_cert);
p7 = (pkcs7_t*)container;
enumerator = p7->create_cert_enumerator(p7);
while (enumerator->enumerate(enumerator, &cert))
{
x509_t *x509 = (x509_t*)cert;
if (!(x509->get_flags(x509) & X509_CA))
{
if (stored)
{
exit_scepclient("multiple certs received, only first stored");
}
if (!cert->get_encoding(cert, CERT_ASN1_DER, &encoding) ||
!chunk_write(encoding, path, 0022, force))
{
exit_scepclient("could not write cert file '%s': %s",
path, strerror(errno));
}
chunk_free(&encoding);
stored = TRUE;
}
}
enumerator->destroy(enumerator);
container->destroy(container);
chunk_free(&attrs.transID);
chunk_free(&attrs.senderNonce);
chunk_free(&attrs.recipientNonce);
filetype_out &= ~CERT; /* delete CERT flag */
}
exit_scepclient(NULL);
return -1; /* should never be reached */
}
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