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mbedtls/library/x509_crl.c
Gilles Peskine 449bd8303e Switch to the new code style 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2023-01-11 14:50:10 +01:00

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/*
* X.509 Certificate Revocation List (CRL) parsing
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* The ITU-T X.509 standard defines a certificate format for PKI.
*
* http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs)
* http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs)
* http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10)
*
* http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
* http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
*/
#include "common.h"
#if defined(MBEDTLS_X509_CRL_PARSE_C)
#include "mbedtls/x509_crl.h"
#include "mbedtls/error.h"
#include "mbedtls/oid.h"
#include "mbedtls/platform_util.h"
#include <string.h>
#if defined(MBEDTLS_PEM_PARSE_C)
#include "mbedtls/pem.h"
#endif
#include "mbedtls/platform.h"
#if defined(MBEDTLS_HAVE_TIME)
#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
#include <windows.h>
#else
#include <time.h>
#endif
#endif
#if defined(MBEDTLS_FS_IO) || defined(EFIX64) || defined(EFI32)
#include <stdio.h>
#endif
/*
* Version ::= INTEGER { v1(0), v2(1) }
*/
static int x509_crl_get_version(unsigned char **p,
const unsigned char *end,
int *ver)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if ((ret = mbedtls_asn1_get_int(p, end, ver)) != 0) {
if (ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
*ver = 0;
return 0;
}
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_VERSION, ret);
}
return 0;
}
/*
* X.509 CRL v2 extensions
*
* We currently don't parse any extension's content, but we do check that the
* list of extensions is well-formed and abort on critical extensions (that
* are unsupported as we don't support any extension so far)
*/
static int x509_get_crl_ext(unsigned char **p,
const unsigned char *end,
mbedtls_x509_buf *ext)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if (*p == end) {
return 0;
}
/*
* crlExtensions [0] EXPLICIT Extensions OPTIONAL
* -- if present, version MUST be v2
*/
if ((ret = mbedtls_x509_get_ext(p, end, ext, 0)) != 0) {
return ret;
}
end = ext->p + ext->len;
while (*p < end) {
/*
* Extension ::= SEQUENCE {
* extnID OBJECT IDENTIFIER,
* critical BOOLEAN DEFAULT FALSE,
* extnValue OCTET STRING }
*/
int is_critical = 0;
const unsigned char *end_ext_data;
size_t len;
/* Get enclosing sequence tag */
if ((ret = mbedtls_asn1_get_tag(p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
end_ext_data = *p + len;
/* Get OID (currently ignored) */
if ((ret = mbedtls_asn1_get_tag(p, end_ext_data, &len,
MBEDTLS_ASN1_OID)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
*p += len;
/* Get optional critical */
if ((ret = mbedtls_asn1_get_bool(p, end_ext_data,
&is_critical)) != 0 &&
(ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG)) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
/* Data should be octet string type */
if ((ret = mbedtls_asn1_get_tag(p, end_ext_data, &len,
MBEDTLS_ASN1_OCTET_STRING)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
/* Ignore data so far and just check its length */
*p += len;
if (*p != end_ext_data) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
/* Abort on (unsupported) critical extensions */
if (is_critical) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
}
}
if (*p != end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
return 0;
}
/*
* X.509 CRL v2 entry extensions (no extensions parsed yet.)
*/
static int x509_get_crl_entry_ext(unsigned char **p,
const unsigned char *end,
mbedtls_x509_buf *ext)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len = 0;
/* OPTIONAL */
if (end <= *p) {
return 0;
}
ext->tag = **p;
ext->p = *p;
/*
* Get CRL-entry extension sequence header
* crlEntryExtensions Extensions OPTIONAL -- if present, MUST be v2
*/
if ((ret = mbedtls_asn1_get_tag(p, end, &ext->len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
if (ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
ext->p = NULL;
return 0;
}
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
end = *p + ext->len;
if (end != *p + ext->len) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
while (*p < end) {
if ((ret = mbedtls_asn1_get_tag(p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
*p += len;
}
if (*p != end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
return 0;
}
/*
* X.509 CRL Entries
*/
static int x509_get_entries(unsigned char **p,
const unsigned char *end,
mbedtls_x509_crl_entry *entry)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t entry_len;
mbedtls_x509_crl_entry *cur_entry = entry;
if (*p == end) {
return 0;
}
if ((ret = mbedtls_asn1_get_tag(p, end, &entry_len,
MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED)) != 0) {
if (ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
return 0;
}
return ret;
}
end = *p + entry_len;
while (*p < end) {
size_t len2;
const unsigned char *end2;
cur_entry->raw.tag = **p;
if ((ret = mbedtls_asn1_get_tag(p, end, &len2,
MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED)) != 0) {
return ret;
}
cur_entry->raw.p = *p;
cur_entry->raw.len = len2;
end2 = *p + len2;
if ((ret = mbedtls_x509_get_serial(p, end2, &cur_entry->serial)) != 0) {
return ret;
}
if ((ret = mbedtls_x509_get_time(p, end2,
&cur_entry->revocation_date)) != 0) {
return ret;
}
if ((ret = x509_get_crl_entry_ext(p, end2,
&cur_entry->entry_ext)) != 0) {
return ret;
}
if (*p < end) {
cur_entry->next = mbedtls_calloc(1, sizeof(mbedtls_x509_crl_entry));
if (cur_entry->next == NULL) {
return MBEDTLS_ERR_X509_ALLOC_FAILED;
}
cur_entry = cur_entry->next;
}
}
return 0;
}
/*
* Parse one CRLs in DER format and append it to the chained list
*/
int mbedtls_x509_crl_parse_der(mbedtls_x509_crl *chain,
const unsigned char *buf, size_t buflen)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len;
unsigned char *p = NULL, *end = NULL;
mbedtls_x509_buf sig_params1, sig_params2, sig_oid2;
mbedtls_x509_crl *crl = chain;
/*
* Check for valid input
*/
if (crl == NULL || buf == NULL) {
return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
}
memset(&sig_params1, 0, sizeof(mbedtls_x509_buf));
memset(&sig_params2, 0, sizeof(mbedtls_x509_buf));
memset(&sig_oid2, 0, sizeof(mbedtls_x509_buf));
/*
* Add new CRL on the end of the chain if needed.
*/
while (crl->version != 0 && crl->next != NULL) {
crl = crl->next;
}
if (crl->version != 0 && crl->next == NULL) {
crl->next = mbedtls_calloc(1, sizeof(mbedtls_x509_crl));
if (crl->next == NULL) {
mbedtls_x509_crl_free(crl);
return MBEDTLS_ERR_X509_ALLOC_FAILED;
}
mbedtls_x509_crl_init(crl->next);
crl = crl->next;
}
/*
* Copy raw DER-encoded CRL
*/
if (buflen == 0) {
return MBEDTLS_ERR_X509_INVALID_FORMAT;
}
p = mbedtls_calloc(1, buflen);
if (p == NULL) {
return MBEDTLS_ERR_X509_ALLOC_FAILED;
}
memcpy(p, buf, buflen);
crl->raw.p = p;
crl->raw.len = buflen;
end = p + buflen;
/*
* CertificateList ::= SEQUENCE {
* tbsCertList TBSCertList,
* signatureAlgorithm AlgorithmIdentifier,
* signatureValue BIT STRING }
*/
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
mbedtls_x509_crl_free(crl);
return MBEDTLS_ERR_X509_INVALID_FORMAT;
}
if (len != (size_t) (end - p)) {
mbedtls_x509_crl_free(crl);
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
/*
* TBSCertList ::= SEQUENCE {
*/
crl->tbs.p = p;
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
mbedtls_x509_crl_free(crl);
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT, ret);
}
end = p + len;
crl->tbs.len = end - crl->tbs.p;
/*
* Version ::= INTEGER OPTIONAL { v1(0), v2(1) }
* -- if present, MUST be v2
*
* signature AlgorithmIdentifier
*/
if ((ret = x509_crl_get_version(&p, end, &crl->version)) != 0 ||
(ret = mbedtls_x509_get_alg(&p, end, &crl->sig_oid, &sig_params1)) != 0) {
mbedtls_x509_crl_free(crl);
return ret;
}
if (crl->version < 0 || crl->version > 1) {
mbedtls_x509_crl_free(crl);
return MBEDTLS_ERR_X509_UNKNOWN_VERSION;
}
crl->version++;
if ((ret = mbedtls_x509_get_sig_alg(&crl->sig_oid, &sig_params1,
&crl->sig_md, &crl->sig_pk,
&crl->sig_opts)) != 0) {
mbedtls_x509_crl_free(crl);
return MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG;
}
/*
* issuer Name
*/
crl->issuer_raw.p = p;
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
mbedtls_x509_crl_free(crl);
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT, ret);
}
if ((ret = mbedtls_x509_get_name(&p, p + len, &crl->issuer)) != 0) {
mbedtls_x509_crl_free(crl);
return ret;
}
crl->issuer_raw.len = p - crl->issuer_raw.p;
/*
* thisUpdate Time
* nextUpdate Time OPTIONAL
*/
if ((ret = mbedtls_x509_get_time(&p, end, &crl->this_update)) != 0) {
mbedtls_x509_crl_free(crl);
return ret;
}
if ((ret = mbedtls_x509_get_time(&p, end, &crl->next_update)) != 0) {
if (ret != (MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_DATE,
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG)) &&
ret != (MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_DATE,
MBEDTLS_ERR_ASN1_OUT_OF_DATA))) {
mbedtls_x509_crl_free(crl);
return ret;
}
}
/*
* revokedCertificates SEQUENCE OF SEQUENCE {
* userCertificate CertificateSerialNumber,
* revocationDate Time,
* crlEntryExtensions Extensions OPTIONAL
* -- if present, MUST be v2
* } OPTIONAL
*/
if ((ret = x509_get_entries(&p, end, &crl->entry)) != 0) {
mbedtls_x509_crl_free(crl);
return ret;
}
/*
* crlExtensions EXPLICIT Extensions OPTIONAL
* -- if present, MUST be v2
*/
if (crl->version == 2) {
ret = x509_get_crl_ext(&p, end, &crl->crl_ext);
if (ret != 0) {
mbedtls_x509_crl_free(crl);
return ret;
}
}
if (p != end) {
mbedtls_x509_crl_free(crl);
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
end = crl->raw.p + crl->raw.len;
/*
* signatureAlgorithm AlgorithmIdentifier,
* signatureValue BIT STRING
*/
if ((ret = mbedtls_x509_get_alg(&p, end, &sig_oid2, &sig_params2)) != 0) {
mbedtls_x509_crl_free(crl);
return ret;
}
if (crl->sig_oid.len != sig_oid2.len ||
memcmp(crl->sig_oid.p, sig_oid2.p, crl->sig_oid.len) != 0 ||
sig_params1.len != sig_params2.len ||
(sig_params1.len != 0 &&
memcmp(sig_params1.p, sig_params2.p, sig_params1.len) != 0)) {
mbedtls_x509_crl_free(crl);
return MBEDTLS_ERR_X509_SIG_MISMATCH;
}
if ((ret = mbedtls_x509_get_sig(&p, end, &crl->sig)) != 0) {
mbedtls_x509_crl_free(crl);
return ret;
}
if (p != end) {
mbedtls_x509_crl_free(crl);
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
return 0;
}
/*
* Parse one or more CRLs and add them to the chained list
*/
int mbedtls_x509_crl_parse(mbedtls_x509_crl *chain, const unsigned char *buf, size_t buflen)
{
#if defined(MBEDTLS_PEM_PARSE_C)
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t use_len = 0;
mbedtls_pem_context pem;
int is_pem = 0;
if (chain == NULL || buf == NULL) {
return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
}
do {
mbedtls_pem_init(&pem);
// Avoid calling mbedtls_pem_read_buffer() on non-null-terminated
// string
if (buflen == 0 || buf[buflen - 1] != '\0') {
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
} else {
ret = mbedtls_pem_read_buffer(&pem,
"-----BEGIN X509 CRL-----",
"-----END X509 CRL-----",
buf, NULL, 0, &use_len);
}
if (ret == 0) {
/*
* Was PEM encoded
*/
is_pem = 1;
buflen -= use_len;
buf += use_len;
if ((ret = mbedtls_x509_crl_parse_der(chain,
pem.buf, pem.buflen)) != 0) {
mbedtls_pem_free(&pem);
return ret;
}
} else if (is_pem) {
mbedtls_pem_free(&pem);
return ret;
}
mbedtls_pem_free(&pem);
}
/* In the PEM case, buflen is 1 at the end, for the terminated NULL byte.
* And a valid CRL cannot be less than 1 byte anyway. */
while (is_pem && buflen > 1);
if (is_pem) {
return 0;
} else
#endif /* MBEDTLS_PEM_PARSE_C */
return mbedtls_x509_crl_parse_der(chain, buf, buflen);
}
#if defined(MBEDTLS_FS_IO)
/*
* Load one or more CRLs and add them to the chained list
*/
int mbedtls_x509_crl_parse_file(mbedtls_x509_crl *chain, const char *path)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t n;
unsigned char *buf;
if ((ret = mbedtls_pk_load_file(path, &buf, &n)) != 0) {
return ret;
}
ret = mbedtls_x509_crl_parse(chain, buf, n);
mbedtls_platform_zeroize(buf, n);
mbedtls_free(buf);
return ret;
}
#endif /* MBEDTLS_FS_IO */
#if !defined(MBEDTLS_X509_REMOVE_INFO)
/*
* Return an informational string about the certificate.
*/
#define BEFORE_COLON 14
#define BC "14"
/*
* Return an informational string about the CRL.
*/
int mbedtls_x509_crl_info(char *buf, size_t size, const char *prefix,
const mbedtls_x509_crl *crl)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t n;
char *p;
const mbedtls_x509_crl_entry *entry;
p = buf;
n = size;
ret = mbedtls_snprintf(p, n, "%sCRL version : %d",
prefix, crl->version);
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_snprintf(p, n, "\n%sissuer name : ", prefix);
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_x509_dn_gets(p, n, &crl->issuer);
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_snprintf(p, n, "\n%sthis update : " \
"%04d-%02d-%02d %02d:%02d:%02d", prefix,
crl->this_update.year, crl->this_update.mon,
crl->this_update.day, crl->this_update.hour,
crl->this_update.min, crl->this_update.sec);
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_snprintf(p, n, "\n%snext update : " \
"%04d-%02d-%02d %02d:%02d:%02d", prefix,
crl->next_update.year, crl->next_update.mon,
crl->next_update.day, crl->next_update.hour,
crl->next_update.min, crl->next_update.sec);
MBEDTLS_X509_SAFE_SNPRINTF;
entry = &crl->entry;
ret = mbedtls_snprintf(p, n, "\n%sRevoked certificates:",
prefix);
MBEDTLS_X509_SAFE_SNPRINTF;
while (entry != NULL && entry->raw.len != 0) {
ret = mbedtls_snprintf(p, n, "\n%sserial number: ",
prefix);
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_x509_serial_gets(p, n, &entry->serial);
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_snprintf(p, n, " revocation date: " \
"%04d-%02d-%02d %02d:%02d:%02d",
entry->revocation_date.year, entry->revocation_date.mon,
entry->revocation_date.day, entry->revocation_date.hour,
entry->revocation_date.min, entry->revocation_date.sec);
MBEDTLS_X509_SAFE_SNPRINTF;
entry = entry->next;
}
ret = mbedtls_snprintf(p, n, "\n%ssigned using : ", prefix);
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_x509_sig_alg_gets(p, n, &crl->sig_oid, crl->sig_pk, crl->sig_md,
crl->sig_opts);
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_snprintf(p, n, "\n");
MBEDTLS_X509_SAFE_SNPRINTF;
return (int) (size - n);
}
#endif /* MBEDTLS_X509_REMOVE_INFO */
/*
* Initialize a CRL chain
*/
void mbedtls_x509_crl_init(mbedtls_x509_crl *crl)
{
memset(crl, 0, sizeof(mbedtls_x509_crl));
}
/*
* Unallocate all CRL data
*/
void mbedtls_x509_crl_free(mbedtls_x509_crl *crl)
{
mbedtls_x509_crl *crl_cur = crl;
mbedtls_x509_crl *crl_prv;
mbedtls_x509_crl_entry *entry_cur;
mbedtls_x509_crl_entry *entry_prv;
while (crl_cur != NULL) {
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
mbedtls_free(crl_cur->sig_opts);
#endif
mbedtls_asn1_free_named_data_list_shallow(crl_cur->issuer.next);
entry_cur = crl_cur->entry.next;
while (entry_cur != NULL) {
entry_prv = entry_cur;
entry_cur = entry_cur->next;
mbedtls_platform_zeroize(entry_prv,
sizeof(mbedtls_x509_crl_entry));
mbedtls_free(entry_prv);
}
if (crl_cur->raw.p != NULL) {
mbedtls_platform_zeroize(crl_cur->raw.p, crl_cur->raw.len);
mbedtls_free(crl_cur->raw.p);
}
crl_prv = crl_cur;
crl_cur = crl_cur->next;
mbedtls_platform_zeroize(crl_prv, sizeof(mbedtls_x509_crl));
if (crl_prv != crl) {
mbedtls_free(crl_prv);
}
}
}
#endif /* MBEDTLS_X509_CRL_PARSE_C */
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