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/*
SSSD
Helper child to commmunicate with SmartCard -- common code
Authors:
Sumit Bose <sbose@redhat.com>
Copyright (C) 2019 Red Hat
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 3 of the License, or
(at your option) any later version.
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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <talloc.h>
#include "util/util.h"
#include "p11_child/p11_child.h"
static struct cert_verify_opts *init_cert_verify_opts(TALLOC_CTX *mem_ctx)
{
struct cert_verify_opts *cert_verify_opts;
cert_verify_opts = talloc_zero(mem_ctx, struct cert_verify_opts);
if (cert_verify_opts == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "talloc_new failed.\n");
return NULL;
}
cert_verify_opts->do_ocsp = true;
cert_verify_opts->do_verification = true;
cert_verify_opts->verification_partial_chain = false;
cert_verify_opts->ocsp_default_responder = NULL;
cert_verify_opts->ocsp_default_responder_signing_cert = NULL;
cert_verify_opts->crl_files = NULL;
cert_verify_opts->ocsp_dgst = CKM_SHA_1;
cert_verify_opts->soft_ocsp = false;
cert_verify_opts->soft_crl = false;
return cert_verify_opts;
}
#define OCSP_DEFAUL_RESPONDER "ocsp_default_responder="
#define OCSP_DEFAUL_RESPONDER_LEN (sizeof(OCSP_DEFAUL_RESPONDER) - 1)
#define OCSP_DEFAUL_RESPONDER_SIGNING_CERT \
"ocsp_default_responder_signing_cert="
#define OCSP_DEFAUL_RESPONDER_SIGNING_CERT_LEN \
(sizeof(OCSP_DEFAUL_RESPONDER_SIGNING_CERT) - 1)
#define CRL_FILE "crl_file="
#define CRL_FILE_LEN (sizeof(CRL_FILE) -1)
#define OCSP_DGST "ocsp_dgst="
#define OCSP_DGST_LEN (sizeof(OCSP_DGST) -1)
static errno_t parse_crl_files(const char *filename, size_t c,
struct cert_verify_opts *_opts)
{
int ret;
if (_opts->num_files == 0) {
_opts->crl_files = talloc_array(_opts, char *, 1);
} else {
_opts->crl_files = talloc_realloc(_opts, _opts->crl_files,
char *, _opts->num_files + 1);
}
if (_opts->crl_files == NULL) {
ret = ENOMEM;
goto done;
}
_opts->crl_files[_opts->num_files] = talloc_strdup(_opts,
filename);
if (_opts->crl_files[_opts->num_files] == NULL
|| *_opts->crl_files[_opts->num_files] == '\0') {
DEBUG(SSSDBG_CRIT_FAILURE,
"Failed to parse crl_file option [%s].\n", filename);
ret = EINVAL;
goto done;
}
_opts->num_files++;
ret = EOK;
done:
return ret;
}
errno_t parse_cert_verify_opts(TALLOC_CTX *mem_ctx, const char *verify_opts,
struct cert_verify_opts **_cert_verify_opts)
{
int ret;
TALLOC_CTX *tmp_ctx;
char **opts;
size_t c;
struct cert_verify_opts *cert_verify_opts;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "talloc_new failed.\n");
return ENOMEM;
}
cert_verify_opts = init_cert_verify_opts(tmp_ctx);
if (cert_verify_opts == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "init_cert_verify_opts failed.\n");
ret = ENOMEM;
goto done;
}
if (verify_opts == NULL) {
ret = EOK;
goto done;
}
ret = split_on_separator(tmp_ctx, verify_opts, ',', true, true, &opts,
NULL);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "split_on_separator failed.\n");
goto done;
}
for (c = 0; opts[c] != NULL; c++) {
if (strcasecmp(opts[c], "no_ocsp") == 0) {
DEBUG(SSSDBG_TRACE_ALL,
"Found 'no_ocsp' option, disabling OCSP.\n");
cert_verify_opts->do_ocsp = false;
} else if (strcasecmp(opts[c], "no_verification") == 0) {
DEBUG(SSSDBG_CRIT_FAILURE,
"Found 'no_verification' option, "
"disabling verification completely. "
"This should not be used in production.\n");
sss_log(SSS_LOG_CRIT,
"Smart card certificate verification disabled completely. "
"This should not be used in production.");
cert_verify_opts->do_verification = false;
} else if (strcasecmp(opts[c], "partial_chain") == 0) {
DEBUG(SSSDBG_TRACE_ALL,
"Found 'partial_chain' option, verification will not fail if "
"a complete chain cannot be built to a self-signed "
"trust-anchor, provided it is possible to construct a chain "
"to a trusted certificate that might not be self-signed.\n");
cert_verify_opts->verification_partial_chain = true;
} else if (strncasecmp(opts[c], OCSP_DEFAUL_RESPONDER,
OCSP_DEFAUL_RESPONDER_LEN) == 0) {
cert_verify_opts->ocsp_default_responder =
talloc_strdup(cert_verify_opts,
&opts[c][OCSP_DEFAUL_RESPONDER_LEN]);
if (cert_verify_opts->ocsp_default_responder == NULL
|| *cert_verify_opts->ocsp_default_responder == '\0') {
DEBUG(SSSDBG_CRIT_FAILURE,
"Failed to parse ocsp_default_responder option [%s].\n",
opts[c]);
ret = EINVAL;
goto done;
}
DEBUG(SSSDBG_TRACE_ALL, "Using OCSP default responder [%s]\n",
cert_verify_opts->ocsp_default_responder);
} else if (strncasecmp(opts[c],
OCSP_DEFAUL_RESPONDER_SIGNING_CERT,
OCSP_DEFAUL_RESPONDER_SIGNING_CERT_LEN) == 0) {
cert_verify_opts->ocsp_default_responder_signing_cert =
talloc_strdup(cert_verify_opts,
&opts[c][OCSP_DEFAUL_RESPONDER_SIGNING_CERT_LEN]);
if (cert_verify_opts->ocsp_default_responder_signing_cert == NULL
|| *cert_verify_opts->ocsp_default_responder_signing_cert
== '\0') {
DEBUG(SSSDBG_CRIT_FAILURE,
"Failed to parse ocsp_default_responder_signing_cert "
"option [%s].\n", opts[c]);
ret = EINVAL;
goto done;
}
DEBUG(SSSDBG_TRACE_ALL,
"Using OCSP default responder signing cert nickname [%s]\n",
cert_verify_opts->ocsp_default_responder_signing_cert);
} else if (strncasecmp(opts[c], CRL_FILE, CRL_FILE_LEN) == 0) {
ret = parse_crl_files(&opts[c][CRL_FILE_LEN], c, cert_verify_opts);
if (ret != EOK) {
goto done;
}
} else if (strncasecmp(opts[c], OCSP_DGST, OCSP_DGST_LEN) == 0) {
if (strcmp("sha1", &opts[c][OCSP_DGST_LEN]) == 0) {
cert_verify_opts->ocsp_dgst = CKM_SHA_1;
DEBUG(SSSDBG_TRACE_ALL, "Using sha1 for OCSP.\n");
} else if (strcmp("sha256", &opts[c][OCSP_DGST_LEN]) == 0) {
cert_verify_opts->ocsp_dgst = CKM_SHA256;
DEBUG(SSSDBG_TRACE_ALL, "Using sha256 for OCSP.\n");
} else if (strcmp("sha384", &opts[c][OCSP_DGST_LEN]) == 0) {
cert_verify_opts->ocsp_dgst = CKM_SHA384;
DEBUG(SSSDBG_TRACE_ALL, "Using sha384 for OCSP.\n");
} else if (strcmp("sha512", &opts[c][OCSP_DGST_LEN]) == 0) {
cert_verify_opts->ocsp_dgst = CKM_SHA512;
DEBUG(SSSDBG_TRACE_ALL, "Using sha512 for OCSP.\n");
} else {
DEBUG(SSSDBG_CRIT_FAILURE,
"Unsupported digest for OCSP [%s], "
"using default sha1.\n", &opts[c][OCSP_DGST_LEN]);
cert_verify_opts->ocsp_dgst = CKM_SHA_1;
}
} else if (strcasecmp(opts[c], "soft_ocsp") == 0) {
DEBUG(SSSDBG_TRACE_ALL,
"Found 'soft_ocsp' option, verification will not fail if "
"OCSP responder cannot be connected.\n");
cert_verify_opts->soft_ocsp = true;
} else if (strcasecmp(opts[c], "soft_crl") == 0) {
DEBUG(SSSDBG_TRACE_ALL,
"Found 'soft_crl' option, verification will not fail if "
"CRL is expired.\n");
cert_verify_opts->soft_crl = true;
} else {
DEBUG(SSSDBG_CRIT_FAILURE,
"Unsupported certificate verification option [%s], " \
"skipping.\n", opts[c]);
}
}
ret = EOK;
done:
if (ret == EOK) {
*_cert_verify_opts = talloc_steal(mem_ctx, cert_verify_opts);
}
talloc_free(tmp_ctx);
return ret;
}
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