/work/mbedtls-3.6.6/library/x509_crl.c

Source
/*
 *  X.509 Certificate Revocation List (CRL) parsing
 *
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */
/*
 *  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 "x509_internal.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 = (size_t) (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 = (size_t) (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_zeroize_and_free(buf, n);

    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_zeroize_and_free(entry_prv,
                                     sizeof(mbedtls_x509_crl_entry));
        }

        if (crl_cur->raw.p != NULL) {
            mbedtls_zeroize_and_free(crl_cur->raw.p, crl_cur->raw.len);
        }

        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 */

Coverage Report

Created: 2026-10-17 06:10

Line	Count	Source
1		/*
2		* X.509 Certificate Revocation List (CRL) parsing
3		*
4		* Copyright The Mbed TLS Contributors
5		* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
6		*/
7		/*
8		* The ITU-T X.509 standard defines a certificate format for PKI.
9		*
10		* http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs)
11		* http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs)
12		* http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10)
13		*
14		* http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
15		* http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
16		*/
17
18		#include "common.h"
19
20		#if defined(MBEDTLS_X509_CRL_PARSE_C)
21
22		#include "mbedtls/x509_crl.h"
23		#include "x509_internal.h"
24		#include "mbedtls/error.h"
25		#include "mbedtls/oid.h"
26		#include "mbedtls/platform_util.h"
27
28		#include <string.h>
29
30		#if defined(MBEDTLS_PEM_PARSE_C)
31		#include "mbedtls/pem.h"
32		#endif
33
34		#include "mbedtls/platform.h"
35
36		#if defined(MBEDTLS_HAVE_TIME)
37		#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
38		#include <windows.h>
39		#else
40		#include <time.h>
41		#endif
42		#endif
43
44		#if defined(MBEDTLS_FS_IO) \|\| defined(EFIX64) \|\| defined(EFI32)
45		#include <stdio.h>
46		#endif
47
48		/*
49		* Version ::= INTEGER { v1(0), v2(1) }
50		*/
51		static int x509_crl_get_version(unsigned char **p,
52		const unsigned char *end,
53		int *ver)
54	0	{
55	0	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
56
57	0	if ((ret = mbedtls_asn1_get_int(p, end, ver)) != 0) {
58	0	if (ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
59	0	*ver = 0;
60	0	return 0;
61	0	}
62
63	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_VERSION, ret);
64	0	}
65
66	0	return 0;
67	0	}
68
69		/*
70		* X.509 CRL v2 extensions
71		*
72		* We currently don't parse any extension's content, but we do check that the
73		* list of extensions is well-formed and abort on critical extensions (that
74		* are unsupported as we don't support any extension so far)
75		*/
76		static int x509_get_crl_ext(unsigned char **p,
77		const unsigned char *end,
78		mbedtls_x509_buf *ext)
79	0	{
80	0	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
81
82	0	if (*p == end) {
83	0	return 0;
84	0	}
85
86		/*
87		* crlExtensions [0] EXPLICIT Extensions OPTIONAL
88		* -- if present, version MUST be v2
89		*/
90	0	if ((ret = mbedtls_x509_get_ext(p, end, ext, 0)) != 0) {
91	0	return ret;
92	0	}
93
94	0	end = ext->p + ext->len;
95
96	0	while (*p < end) {
97		/*
98		* Extension ::= SEQUENCE {
99		* extnID OBJECT IDENTIFIER,
100		* critical BOOLEAN DEFAULT FALSE,
101		* extnValue OCTET STRING }
102		*/
103	0	int is_critical = 0;
104	0	const unsigned char *end_ext_data;
105	0	size_t len;
106
107		/* Get enclosing sequence tag */
108	0	if ((ret = mbedtls_asn1_get_tag(p, end, &len,
109	0	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE)) != 0) {
110	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
111	0	}
112
113	0	end_ext_data = *p + len;
114
115		/* Get OID (currently ignored) */
116	0	if ((ret = mbedtls_asn1_get_tag(p, end_ext_data, &len,
117	0	MBEDTLS_ASN1_OID)) != 0) {
118	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
119	0	}
120	0	*p += len;
121
122		/* Get optional critical */
123	0	if ((ret = mbedtls_asn1_get_bool(p, end_ext_data,
124	0	&is_critical)) != 0 &&
125	0	(ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG)) {
126	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
127	0	}
128
129		/* Data should be octet string type */
130	0	if ((ret = mbedtls_asn1_get_tag(p, end_ext_data, &len,
131	0	MBEDTLS_ASN1_OCTET_STRING)) != 0) {
132	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
133	0	}
134
135		/* Ignore data so far and just check its length */
136	0	*p += len;
137	0	if (*p != end_ext_data) {
138	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
139	0	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
140	0	}
141
142		/* Abort on (unsupported) critical extensions */
143	0	if (is_critical) {
144	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
145	0	MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
146	0	}
147	0	}
148
149	0	if (*p != end) {
150	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
151	0	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
152	0	}
153
154	0	return 0;
155	0	}
156
157		/*
158		* X.509 CRL v2 entry extensions (no extensions parsed yet.)
159		*/
160		static int x509_get_crl_entry_ext(unsigned char **p,
161		const unsigned char *end,
162		mbedtls_x509_buf *ext)
163	0	{
164	0	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
165	0	size_t len = 0;
166
167		/* OPTIONAL */
168	0	if (end <= *p) {
169	0	return 0;
170	0	}
171
172	0	ext->tag = **p;
173	0	ext->p = *p;
174
175		/*
176		* Get CRL-entry extension sequence header
177		* crlEntryExtensions Extensions OPTIONAL -- if present, MUST be v2
178		*/
179	0	if ((ret = mbedtls_asn1_get_tag(p, end, &ext->len,
180	0	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE)) != 0) {
181	0	if (ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
182	0	ext->p = NULL;
183	0	return 0;
184	0	}
185	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
186	0	}
187
188	0	end = *p + ext->len;
189
190	0	if (end != *p + ext->len) {
191	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
192	0	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
193	0	}
194
195	0	while (*p < end) {
196	0	if ((ret = mbedtls_asn1_get_tag(p, end, &len,
197	0	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE)) != 0) {
198	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
199	0	}
200
201	0	*p += len;
202	0	}
203
204	0	if (*p != end) {
205	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
206	0	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
207	0	}
208
209	0	return 0;
210	0	}
211
212		/*
213		* X.509 CRL Entries
214		*/
215		static int x509_get_entries(unsigned char **p,
216		const unsigned char *end,
217		mbedtls_x509_crl_entry *entry)
218	0	{
219	0	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
220	0	size_t entry_len;
221	0	mbedtls_x509_crl_entry *cur_entry = entry;
222
223	0	if (*p == end) {
224	0	return 0;
225	0	}
226
227	0	if ((ret = mbedtls_asn1_get_tag(p, end, &entry_len,
228	0	MBEDTLS_ASN1_SEQUENCE \| MBEDTLS_ASN1_CONSTRUCTED)) != 0) {
229	0	if (ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
230	0	return 0;
231	0	}
232
233	0	return ret;
234	0	}
235
236	0	end = *p + entry_len;
237
238	0	while (*p < end) {
239	0	size_t len2;
240	0	const unsigned char *end2;
241
242	0	cur_entry->raw.tag = **p;
243	0	if ((ret = mbedtls_asn1_get_tag(p, end, &len2,
244	0	MBEDTLS_ASN1_SEQUENCE \| MBEDTLS_ASN1_CONSTRUCTED)) != 0) {
245	0	return ret;
246	0	}
247
248	0	cur_entry->raw.p = *p;
249	0	cur_entry->raw.len = len2;
250	0	end2 = *p + len2;
251
252	0	if ((ret = mbedtls_x509_get_serial(p, end2, &cur_entry->serial)) != 0) {
253	0	return ret;
254	0	}
255
256	0	if ((ret = mbedtls_x509_get_time(p, end2,
257	0	&cur_entry->revocation_date)) != 0) {
258	0	return ret;
259	0	}
260
261	0	if ((ret = x509_get_crl_entry_ext(p, end2,
262	0	&cur_entry->entry_ext)) != 0) {
263	0	return ret;
264	0	}
265
266	0	if (*p < end) {
267	0	cur_entry->next = mbedtls_calloc(1, sizeof(mbedtls_x509_crl_entry));
268
269	0	if (cur_entry->next == NULL) {
270	0	return MBEDTLS_ERR_X509_ALLOC_FAILED;
271	0	}
272
273	0	cur_entry = cur_entry->next;
274	0	}
275	0	}
276
277	0	return 0;
278	0	}
279
280		/*
281		* Parse one CRLs in DER format and append it to the chained list
282		*/
283		int mbedtls_x509_crl_parse_der(mbedtls_x509_crl *chain,
284		const unsigned char *buf, size_t buflen)
285	0	{
286	0	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
287	0	size_t len;
288	0	unsigned char p = NULL, end = NULL;
289	0	mbedtls_x509_buf sig_params1, sig_params2, sig_oid2;
290	0	mbedtls_x509_crl *crl = chain;
291
292		/*
293		* Check for valid input
294		*/
295	0	if (crl == NULL \|\| buf == NULL) {
296	0	return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
297	0	}
298
299	0	memset(&sig_params1, 0, sizeof(mbedtls_x509_buf));
300	0	memset(&sig_params2, 0, sizeof(mbedtls_x509_buf));
301	0	memset(&sig_oid2, 0, sizeof(mbedtls_x509_buf));
302
303		/*
304		* Add new CRL on the end of the chain if needed.
305		*/
306	0	while (crl->version != 0 && crl->next != NULL) {
307	0	crl = crl->next;
308	0	}
309
310	0	if (crl->version != 0 && crl->next == NULL) {
311	0	crl->next = mbedtls_calloc(1, sizeof(mbedtls_x509_crl));
312
313	0	if (crl->next == NULL) {
314	0	mbedtls_x509_crl_free(crl);
315	0	return MBEDTLS_ERR_X509_ALLOC_FAILED;
316	0	}
317
318	0	mbedtls_x509_crl_init(crl->next);
319	0	crl = crl->next;
320	0	}
321
322		/*
323		* Copy raw DER-encoded CRL
324		*/
325	0	if (buflen == 0) {
326	0	return MBEDTLS_ERR_X509_INVALID_FORMAT;
327	0	}
328
329	0	p = mbedtls_calloc(1, buflen);
330	0	if (p == NULL) {
331	0	return MBEDTLS_ERR_X509_ALLOC_FAILED;
332	0	}
333
334	0	memcpy(p, buf, buflen);
335
336	0	crl->raw.p = p;
337	0	crl->raw.len = buflen;
338
339	0	end = p + buflen;
340
341		/*
342		* CertificateList ::= SEQUENCE {
343		* tbsCertList TBSCertList,
344		* signatureAlgorithm AlgorithmIdentifier,
345		* signatureValue BIT STRING }
346		*/
347	0	if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
348	0	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE)) != 0) {
349	0	mbedtls_x509_crl_free(crl);
350	0	return MBEDTLS_ERR_X509_INVALID_FORMAT;
351	0	}
352
353	0	if (len != (size_t) (end - p)) {
354	0	mbedtls_x509_crl_free(crl);
355	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT,
356	0	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
357	0	}
358
359		/*
360		* TBSCertList ::= SEQUENCE {
361		*/
362	0	crl->tbs.p = p;
363
364	0	if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
365	0	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE)) != 0) {
366	0	mbedtls_x509_crl_free(crl);
367	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT, ret);
368	0	}
369
370	0	end = p + len;
371	0	crl->tbs.len = (size_t) (end - crl->tbs.p);
372
373		/*
374		* Version ::= INTEGER OPTIONAL { v1(0), v2(1) }
375		* -- if present, MUST be v2
376		*
377		* signature AlgorithmIdentifier
378		*/
379	0	if ((ret = x509_crl_get_version(&p, end, &crl->version)) != 0 \|\|
380	0	(ret = mbedtls_x509_get_alg(&p, end, &crl->sig_oid, &sig_params1)) != 0) {
381	0	mbedtls_x509_crl_free(crl);
382	0	return ret;
383	0	}
384
385	0	if (crl->version < 0 \|\| crl->version > 1) {
386	0	mbedtls_x509_crl_free(crl);
387	0	return MBEDTLS_ERR_X509_UNKNOWN_VERSION;
388	0	}
389
390	0	crl->version++;
391
392	0	if ((ret = mbedtls_x509_get_sig_alg(&crl->sig_oid, &sig_params1,
393	0	&crl->sig_md, &crl->sig_pk,
394	0	&crl->sig_opts)) != 0) {
395	0	mbedtls_x509_crl_free(crl);
396	0	return MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG;
397	0	}
398
399		/*
400		* issuer Name
401		*/
402	0	crl->issuer_raw.p = p;
403
404	0	if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
405	0	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE)) != 0) {
406	0	mbedtls_x509_crl_free(crl);
407	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT, ret);
408	0	}
409
410	0	if ((ret = mbedtls_x509_get_name(&p, p + len, &crl->issuer)) != 0) {
411	0	mbedtls_x509_crl_free(crl);
412	0	return ret;
413	0	}
414
415	0	crl->issuer_raw.len = (size_t) (p - crl->issuer_raw.p);
416
417		/*
418		* thisUpdate Time
419		* nextUpdate Time OPTIONAL
420		*/
421	0	if ((ret = mbedtls_x509_get_time(&p, end, &crl->this_update)) != 0) {
422	0	mbedtls_x509_crl_free(crl);
423	0	return ret;
424	0	}
425
426	0	if ((ret = mbedtls_x509_get_time(&p, end, &crl->next_update)) != 0) {
427	0	if (ret != (MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_DATE,
428	0	MBEDTLS_ERR_ASN1_UNEXPECTED_TAG)) &&
429	0	ret != (MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_DATE,
430	0	MBEDTLS_ERR_ASN1_OUT_OF_DATA))) {
431	0	mbedtls_x509_crl_free(crl);
432	0	return ret;
433	0	}
434	0	}
435
436		/*
437		* revokedCertificates SEQUENCE OF SEQUENCE {
438		* userCertificate CertificateSerialNumber,
439		* revocationDate Time,
440		* crlEntryExtensions Extensions OPTIONAL
441		* -- if present, MUST be v2
442		* } OPTIONAL
443		*/
444	0	if ((ret = x509_get_entries(&p, end, &crl->entry)) != 0) {
445	0	mbedtls_x509_crl_free(crl);
446	0	return ret;
447	0	}
448
449		/*
450		* crlExtensions EXPLICIT Extensions OPTIONAL
451		* -- if present, MUST be v2
452		*/
453	0	if (crl->version == 2) {
454	0	ret = x509_get_crl_ext(&p, end, &crl->crl_ext);
455
456	0	if (ret != 0) {
457	0	mbedtls_x509_crl_free(crl);
458	0	return ret;
459	0	}
460	0	}
461
462	0	if (p != end) {
463	0	mbedtls_x509_crl_free(crl);
464	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT,
465	0	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
466	0	}
467
468	0	end = crl->raw.p + crl->raw.len;
469
470		/*
471		* signatureAlgorithm AlgorithmIdentifier,
472		* signatureValue BIT STRING
473		*/
474	0	if ((ret = mbedtls_x509_get_alg(&p, end, &sig_oid2, &sig_params2)) != 0) {
475	0	mbedtls_x509_crl_free(crl);
476	0	return ret;
477	0	}
478
479	0	if (crl->sig_oid.len != sig_oid2.len \|\|
480	0	memcmp(crl->sig_oid.p, sig_oid2.p, crl->sig_oid.len) != 0 \|\|
481	0	sig_params1.len != sig_params2.len \|\|
482	0	(sig_params1.len != 0 &&
483	0	memcmp(sig_params1.p, sig_params2.p, sig_params1.len) != 0)) {
484	0	mbedtls_x509_crl_free(crl);
485	0	return MBEDTLS_ERR_X509_SIG_MISMATCH;
486	0	}
487
488	0	if ((ret = mbedtls_x509_get_sig(&p, end, &crl->sig)) != 0) {
489	0	mbedtls_x509_crl_free(crl);
490	0	return ret;
491	0	}
492
493	0	if (p != end) {
494	0	mbedtls_x509_crl_free(crl);
495	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT,
496	0	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
497	0	}
498
499	0	return 0;
500	0	}
501
502		/*
503		* Parse one or more CRLs and add them to the chained list
504		*/
505		int mbedtls_x509_crl_parse(mbedtls_x509_crl chain, const unsigned char buf, size_t buflen)
506	0	{
507	0	#if defined(MBEDTLS_PEM_PARSE_C)
508	0	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
509	0	size_t use_len = 0;
510	0	mbedtls_pem_context pem;
511	0	int is_pem = 0;
512
513	0	if (chain == NULL \|\| buf == NULL) {
514	0	return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
515	0	}
516
517	0	do {
518	0	mbedtls_pem_init(&pem);
519
520		// Avoid calling mbedtls_pem_read_buffer() on non-null-terminated
521		// string
522	0	if (buflen == 0 \|\| buf[buflen - 1] != '\0') {
523	0	ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
524	0	} else {
525	0	ret = mbedtls_pem_read_buffer(&pem,
526	0	"-----BEGIN X509 CRL-----",
527	0	"-----END X509 CRL-----",
528	0	buf, NULL, 0, &use_len);
529	0	}
530
531	0	if (ret == 0) {
532		/*
533		* Was PEM encoded
534		*/
535	0	is_pem = 1;
536
537	0	buflen -= use_len;
538	0	buf += use_len;
539
540	0	if ((ret = mbedtls_x509_crl_parse_der(chain,
541	0	pem.buf, pem.buflen)) != 0) {
542	0	mbedtls_pem_free(&pem);
543	0	return ret;
544	0	}
545	0	} else if (is_pem) {
546	0	mbedtls_pem_free(&pem);
547	0	return ret;
548	0	}
549
550	0	mbedtls_pem_free(&pem);
551	0	}
552		/* In the PEM case, buflen is 1 at the end, for the terminated NULL byte.
553		* And a valid CRL cannot be less than 1 byte anyway. */
554	0	while (is_pem && buflen > 1);
555
556	0	if (is_pem) {
557	0	return 0;
558	0	} else
559	0	#endif /* MBEDTLS_PEM_PARSE_C */
560	0	return mbedtls_x509_crl_parse_der(chain, buf, buflen);
561	0	}
562
563		#if defined(MBEDTLS_FS_IO)
564		/*
565		* Load one or more CRLs and add them to the chained list
566		*/
567		int mbedtls_x509_crl_parse_file(mbedtls_x509_crl chain, const char path)
568	0	{
569	0	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
570	0	size_t n;
571	0	unsigned char *buf;
572
573	0	if ((ret = mbedtls_pk_load_file(path, &buf, &n)) != 0) {
574	0	return ret;
575	0	}
576
577	0	ret = mbedtls_x509_crl_parse(chain, buf, n);
578
579	0	mbedtls_zeroize_and_free(buf, n);
580
581	0	return ret;
582	0	}
583		#endif /* MBEDTLS_FS_IO */
584
585		#if !defined(MBEDTLS_X509_REMOVE_INFO)
586		/*
587		* Return an informational string about the certificate.
588		*/
589		#define BEFORE_COLON 14
590		#define BC "14"
591		/*
592		* Return an informational string about the CRL.
593		*/
594		int mbedtls_x509_crl_info(char buf, size_t size, const char prefix,
595		const mbedtls_x509_crl *crl)
596	0	{
597	0	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
598	0	size_t n;
599	0	char *p;
600	0	const mbedtls_x509_crl_entry *entry;
601
602	0	p = buf;
603	0	n = size;
604
605	0	ret = mbedtls_snprintf(p, n, "%sCRL version : %d",
606	0	prefix, crl->version);
607	0	MBEDTLS_X509_SAFE_SNPRINTF;
608
609	0	ret = mbedtls_snprintf(p, n, "\n%sissuer name : ", prefix);
610	0	MBEDTLS_X509_SAFE_SNPRINTF;
611	0	ret = mbedtls_x509_dn_gets(p, n, &crl->issuer);
612	0	MBEDTLS_X509_SAFE_SNPRINTF;
613
614	0	ret = mbedtls_snprintf(p, n, "\n%sthis update : " \
615	0	"%04d-%02d-%02d %02d:%02d:%02d", prefix,
616	0	crl->this_update.year, crl->this_update.mon,
617	0	crl->this_update.day, crl->this_update.hour,
618	0	crl->this_update.min, crl->this_update.sec);
619	0	MBEDTLS_X509_SAFE_SNPRINTF;
620
621	0	ret = mbedtls_snprintf(p, n, "\n%snext update : " \
622	0	"%04d-%02d-%02d %02d:%02d:%02d", prefix,
623	0	crl->next_update.year, crl->next_update.mon,
624	0	crl->next_update.day, crl->next_update.hour,
625	0	crl->next_update.min, crl->next_update.sec);
626	0	MBEDTLS_X509_SAFE_SNPRINTF;
627
628	0	entry = &crl->entry;
629
630	0	ret = mbedtls_snprintf(p, n, "\n%sRevoked certificates:",
631	0	prefix);
632	0	MBEDTLS_X509_SAFE_SNPRINTF;
633
634	0	while (entry != NULL && entry->raw.len != 0) {
635	0	ret = mbedtls_snprintf(p, n, "\n%sserial number: ",
636	0	prefix);
637	0	MBEDTLS_X509_SAFE_SNPRINTF;
638
639	0	ret = mbedtls_x509_serial_gets(p, n, &entry->serial);
640	0	MBEDTLS_X509_SAFE_SNPRINTF;
641
642	0	ret = mbedtls_snprintf(p, n, " revocation date: " \
643	0	"%04d-%02d-%02d %02d:%02d:%02d",
644	0	entry->revocation_date.year, entry->revocation_date.mon,
645	0	entry->revocation_date.day, entry->revocation_date.hour,
646	0	entry->revocation_date.min, entry->revocation_date.sec);
647	0	MBEDTLS_X509_SAFE_SNPRINTF;
648
649	0	entry = entry->next;
650	0	}
651
652	0	ret = mbedtls_snprintf(p, n, "\n%ssigned using : ", prefix);
653	0	MBEDTLS_X509_SAFE_SNPRINTF;
654
655	0	ret = mbedtls_x509_sig_alg_gets(p, n, &crl->sig_oid, crl->sig_pk, crl->sig_md,
656	0	crl->sig_opts);
657	0	MBEDTLS_X509_SAFE_SNPRINTF;
658
659	0	ret = mbedtls_snprintf(p, n, "\n");
660	0	MBEDTLS_X509_SAFE_SNPRINTF;
661
662	0	return (int) (size - n);
663	0	}
664		#endif /* MBEDTLS_X509_REMOVE_INFO */
665
666		/*
667		* Initialize a CRL chain
668		*/
669		void mbedtls_x509_crl_init(mbedtls_x509_crl *crl)
670	0	{
671	0	memset(crl, 0, sizeof(mbedtls_x509_crl));
672	0	}
673
674		/*
675		* Unallocate all CRL data
676		*/
677		void mbedtls_x509_crl_free(mbedtls_x509_crl *crl)
678	0	{
679	0	mbedtls_x509_crl *crl_cur = crl;
680	0	mbedtls_x509_crl *crl_prv;
681	0	mbedtls_x509_crl_entry *entry_cur;
682	0	mbedtls_x509_crl_entry *entry_prv;
683
684	0	while (crl_cur != NULL) {
685	0	#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
686	0	mbedtls_free(crl_cur->sig_opts);
687	0	#endif
688
689	0	mbedtls_asn1_free_named_data_list_shallow(crl_cur->issuer.next);
690
691	0	entry_cur = crl_cur->entry.next;
692	0	while (entry_cur != NULL) {
693	0	entry_prv = entry_cur;
694	0	entry_cur = entry_cur->next;
695	0	mbedtls_zeroize_and_free(entry_prv,
696	0	sizeof(mbedtls_x509_crl_entry));
697	0	}
698
699	0	if (crl_cur->raw.p != NULL) {
700	0	mbedtls_zeroize_and_free(crl_cur->raw.p, crl_cur->raw.len);
701	0	}
702
703	0	crl_prv = crl_cur;
704	0	crl_cur = crl_cur->next;
705
706	0	mbedtls_platform_zeroize(crl_prv, sizeof(mbedtls_x509_crl));
707	0	if (crl_prv != crl) {
708	0	mbedtls_free(crl_prv);
709	0	}
710	0	}
711	0	}
712
713		#endif /* MBEDTLS_X509_CRL_PARSE_C */