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Diffstat (limited to 'third_party/heimdal/lib/hx509/cert.c')
| -rw-r--r-- | third_party/heimdal/lib/hx509/cert.c | 3892 |
1 files changed, 3892 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hx509/cert.c b/third_party/heimdal/lib/hx509/cert.c new file mode 100644 index 0000000..33805b8 --- /dev/null +++ b/third_party/heimdal/lib/hx509/cert.c @@ -0,0 +1,3892 @@ +/* + * Copyright (c) 2004 - 2007 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "hx_locl.h" +#include "crypto-headers.h" +#include <rtbl.h> + +/** + * @page page_cert The basic certificate + * + * The basic hx509 cerificate object in hx509 is hx509_cert. The + * hx509_cert object is representing one X509/PKIX certificate and + * associated attributes; like private key, friendly name, etc. + * + * A hx509_cert object is usully found via the keyset interfaces (@ref + * page_keyset), but its also possible to create a certificate + * directly from a parsed object with hx509_cert_init() and + * hx509_cert_init_data(). + * + * See the library functions here: @ref hx509_cert + */ + +struct hx509_verify_ctx_data { + hx509_certs trust_anchors; + int flags; +#define HX509_VERIFY_CTX_F_TIME_SET 1 +#define HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE 2 +#define HX509_VERIFY_CTX_F_REQUIRE_RFC3280 4 +#define HX509_VERIFY_CTX_F_CHECK_TRUST_ANCHORS 8 +#define HX509_VERIFY_CTX_F_NO_DEFAULT_ANCHORS 16 +#define HX509_VERIFY_CTX_F_NO_BEST_BEFORE_CHECK 32 + time_t time_now; + unsigned int max_depth; +#define HX509_VERIFY_MAX_DEPTH 30 + hx509_revoke_ctx revoke_ctx; +}; + +#define REQUIRE_RFC3280(ctx) ((ctx)->flags & HX509_VERIFY_CTX_F_REQUIRE_RFC3280) +#define CHECK_TA(ctx) ((ctx)->flags & HX509_VERIFY_CTX_F_CHECK_TRUST_ANCHORS) +#define ALLOW_DEF_TA(ctx) (((ctx)->flags & HX509_VERIFY_CTX_F_NO_DEFAULT_ANCHORS) == 0) + +struct _hx509_cert_attrs { + size_t len; + hx509_cert_attribute *val; +}; + +struct hx509_cert_data { + unsigned int ref; + char *friendlyname; + Certificate *data; + hx509_private_key private_key; + struct _hx509_cert_attrs attrs; + hx509_name basename; + _hx509_cert_release_func release; + void *ctx; +}; + +typedef struct hx509_name_constraints { + NameConstraints *val; + size_t len; +} hx509_name_constraints; + +#define GeneralSubtrees_SET(g,var) \ + (g)->len = (var)->len, (g)->val = (var)->val; + +static void +init_context_once(void *ignored) +{ + + ENGINE_add_conf_module(); + OpenSSL_add_all_algorithms(); +} + +/** + * Return a cookie identifying this instance of a library. + * + * Inputs: + * + * @context A krb5_context + * @module Our library name or a library we depend on + * + * Outputs: The instance cookie + * + * @ingroup krb5_support + */ + +HX509_LIB_FUNCTION uintptr_t HX509_LIB_CALL +hx509_get_instance(const char *libname) +{ + static const char *instance = "libhx509"; + + if (strcmp(libname, "hx509") == 0) + return (uintptr_t)instance; + + return 0; +} + +#ifndef PATH_SEP +# define PATH_SEP ":" +#endif +static const char *hx509_config_file = +"~/.hx509/config" PATH_SEP +SYSCONFDIR "/hx509.conf" PATH_SEP +#ifdef _WIN32 +"%{COMMON_APPDATA}/Heimdal/hx509.conf" PATH_SEP +"%{WINDOWS}/hx509.ini" +#else /* _WIN32 */ +"/etc/hx509.conf" +#endif /* _WIN32 */ +; + +/** + * Creates a hx509 context that most functions in the library + * uses. The context is only allowed to be used by one thread at each + * moment. Free the context with hx509_context_free(). + * + * @param context Returns a pointer to new hx509 context. + * + * @return Returns an hx509 error code. + * + * @ingroup hx509 + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_context_init(hx509_context *contextp) +{ + static heim_base_once_t init_context = HEIM_BASE_ONCE_INIT; + heim_error_code ret; + hx509_context context; + const char *anchors; + char **files = NULL; + + *contextp = NULL; + context = calloc(1, sizeof(*context)); + if (context == NULL) + return ENOMEM; + + heim_base_once_f(&init_context, NULL, init_context_once); + + if ((context->hcontext = heim_context_init()) == NULL) { + free(context); + return ENOMEM; + } + + if ((ret = heim_get_default_config_files(hx509_config_file, + "HX509_CONFIG", + &files))) { + heim_context_free(&context->hcontext); + free(context); + return ret; + } + + /* If there's no hx509 config, we continue, as we never needed it before */ + if (files) + (void) heim_set_config_files(context->hcontext, files, &context->cf); + heim_free_config_files(files); + + _hx509_ks_null_register(context); + _hx509_ks_mem_register(context); + _hx509_ks_file_register(context); + _hx509_ks_pkcs12_register(context); + _hx509_ks_pkcs11_register(context); + _hx509_ks_dir_register(context); + _hx509_ks_keychain_register(context); + + context->ocsp_time_diff = + heim_config_get_time_default(context->hcontext, context->cf, + HX509_DEFAULT_OCSP_TIME_DIFF, + "libdefaults", "ocsp_time_dif", NULL); + + initialize_hx_error_table_r(&context->et_list); + initialize_asn1_error_table_r(&context->et_list); + +#ifdef HX509_DEFAULT_ANCHORS + anchors = heim_config_get_string_default(context->hcontext, context->cf, + HX509_DEFAULT_ANCHORS, + "libdefaults", "anchors", NULL); +#else + anchors = heim_config_get_string(context->hcontext, context->cf, + "libdefaults", "anchors", NULL); +#endif + if (anchors) + (void)hx509_certs_init(context, anchors, 0, NULL, + &context->default_trust_anchors); + + *contextp = context; + return 0; +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_set_log_dest(hx509_context context, heim_log_facility *fac) +{ + return heim_set_log_dest(context->hcontext, fac); +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_set_debug_dest(hx509_context context, heim_log_facility *fac) +{ + return heim_set_debug_dest(context->hcontext, fac); +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_set_warn_dest(hx509_context context, heim_log_facility *fac) +{ + return heim_set_warn_dest(context->hcontext, fac); +} + +/** + * Selects if the hx509_revoke_verify() function is going to require + * the existans of a revokation method (OCSP, CRL) or not. Note that + * hx509_verify_path(), hx509_cms_verify_signed(), and other function + * call hx509_revoke_verify(). + * + * @param context hx509 context to change the flag for. + * @param flag zero, revokation method required, non zero missing + * revokation method ok + * + * @ingroup hx509_verify + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_context_set_missing_revoke(hx509_context context, int flag) +{ + if (flag) + context->flags |= HX509_CTX_VERIFY_MISSING_OK; + else + context->flags &= ~HX509_CTX_VERIFY_MISSING_OK; +} + +/** + * Free the context allocated by hx509_context_init(). + * + * @param context context to be freed. + * + * @ingroup hx509 + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_context_free(hx509_context *context) +{ + if (!*context) + return; + + hx509_clear_error_string(*context); + if ((*context)->ks_ops) { + free((*context)->ks_ops); + (*context)->ks_ops = NULL; + } + (*context)->ks_num_ops = 0; + free_error_table ((*context)->et_list); + if ((*context)->querystat) + free((*context)->querystat); + hx509_certs_free(&(*context)->default_trust_anchors); + heim_config_file_free((*context)->hcontext, (*context)->cf); + heim_context_free(&(*context)->hcontext); + memset(*context, 0, sizeof(**context)); + free(*context); + *context = NULL; +} + +/* + * + */ + +HX509_LIB_FUNCTION Certificate * HX509_LIB_CALL +_hx509_get_cert(hx509_cert cert) +{ + return cert->data; +} + +/* + * + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_cert_get_version(const Certificate *t) +{ + return t->tbsCertificate.version ? *t->tbsCertificate.version + 1 : 1; +} + +static hx509_cert +cert_init(hx509_context context, heim_error_t *error) +{ + hx509_cert cert; + + cert = malloc(sizeof(*cert)); + if (cert == NULL) { + if (error) + *error = heim_error_create_enomem(); + return NULL; + } + cert->ref = 1; + cert->friendlyname = NULL; + cert->attrs.len = 0; + cert->attrs.val = NULL; + cert->private_key = NULL; + cert->basename = NULL; + cert->release = NULL; + cert->ctx = NULL; + cert->data= NULL; + return cert; +} + +/** + * Allocate and init an hx509 certificate object from the decoded + * certificate `c´. + * + * @param context A hx509 context. + * @param c + * @param error + * + * @return Returns an hx509 certificate + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION hx509_cert HX509_LIB_CALL +hx509_cert_init(hx509_context context, const Certificate *c, heim_error_t *error) +{ + hx509_cert cert; + int ret; + + if ((cert = cert_init(context, error)) == NULL) + return NULL; + + cert->data = calloc(1, sizeof(*(cert->data))); + if (cert->data == NULL) { + free(cert); + if (error) + *error = heim_error_create_enomem(); + return NULL; + } + ret = copy_Certificate(c, cert->data); + if (ret) { + free(cert->data); + free(cert); + cert = NULL; + } + return cert; +} + +/** + * Copy a certificate object, but drop any private key assignment. + * + * @param context A hx509 context. + * @param src Certificate object + * @param error + * + * @return Returns an hx509 certificate + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION hx509_cert HX509_LIB_CALL +hx509_cert_copy_no_private_key(hx509_context context, + hx509_cert src, + heim_error_t *error) +{ + return hx509_cert_init(context, src->data, error); +} + +/** + * Allocate and init an hx509 certificate object containing only a private key + * (but no Certificate). + * + * @param context A hx509 context. + * @param key + * @param error + * + * @return Returns an hx509 certificate + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION hx509_cert HX509_LIB_CALL +hx509_cert_init_private_key(hx509_context context, + hx509_private_key key, + heim_error_t *error) +{ + hx509_cert cert; + + if ((cert = cert_init(context, error))) + (void) _hx509_cert_assign_key(cert, key); + return cert; +} + +/** + * Just like hx509_cert_init(), but instead of a decode certificate + * takes an pointer and length to a memory region that contains a + * DER/BER encoded certificate. + * + * If the memory region doesn't contain just the certificate and + * nothing more the function will fail with + * HX509_EXTRA_DATA_AFTER_STRUCTURE. + * + * @param context A hx509 context. + * @param ptr pointer to memory region containing encoded certificate. + * @param len length of memory region. + * @param error possibly returns an error + * + * @return An hx509 certificate + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION hx509_cert HX509_LIB_CALL +hx509_cert_init_data(hx509_context context, + const void *ptr, + size_t len, + heim_error_t *error) +{ + hx509_cert cert; + Certificate t; + size_t size; + int ret; + + ret = decode_Certificate(ptr, len, &t, &size); + if (ret) { + if (error) + *error = heim_error_create(ret, "Failed to decode certificate"); + errno = ret; + return NULL; + } + if (size != len) { + free_Certificate(&t); + if (error) + *error = heim_error_create(HX509_EXTRA_DATA_AFTER_STRUCTURE, + "Extra data after certificate"); + errno = HX509_EXTRA_DATA_AFTER_STRUCTURE; + return NULL; + } + + cert = hx509_cert_init(context, &t, error); + free_Certificate(&t); + return cert; +} + +HX509_LIB_FUNCTION void HX509_LIB_CALL +_hx509_cert_set_release(hx509_cert cert, + _hx509_cert_release_func release, + void *ctx) +{ + cert->release = release; + cert->ctx = ctx; +} + + +/* Doesn't make a copy of `private_key'. */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_cert_assign_key(hx509_cert cert, hx509_private_key private_key) +{ + if (cert->private_key) + hx509_private_key_free(&cert->private_key); + cert->private_key = _hx509_private_key_ref(private_key); + return 0; +} + +/** + * Free reference to the hx509 certificate object, if the refcounter + * reaches 0, the object if freed. Its allowed to pass in NULL. + * + * @param cert the cert to free. + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_cert_free(hx509_cert cert) +{ + size_t i; + + if (cert == NULL) + return; + + if (cert->ref <= 0) + _hx509_abort("cert refcount <= 0 on free"); + if (--cert->ref > 0) + return; + + if (cert->release) + (cert->release)(cert, cert->ctx); + + if (cert->private_key) + hx509_private_key_free(&cert->private_key); + + if (cert->data) + free_Certificate(cert->data); + free(cert->data); + + for (i = 0; i < cert->attrs.len; i++) { + der_free_octet_string(&cert->attrs.val[i]->data); + der_free_oid(&cert->attrs.val[i]->oid); + free(cert->attrs.val[i]); + } + free(cert->attrs.val); + free(cert->friendlyname); + if (cert->basename) + hx509_name_free(&cert->basename); + memset(cert, 0, sizeof(*cert)); + free(cert); +} + +/** + * Add a reference to a hx509 certificate object. + * + * @param cert a pointer to an hx509 certificate object. + * + * @return the same object as is passed in. + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION hx509_cert HX509_LIB_CALL +hx509_cert_ref(hx509_cert cert) +{ + if (cert == NULL) + return NULL; + if (cert->ref <= 0) + _hx509_abort("cert refcount <= 0"); + cert->ref++; + if (cert->ref == 0) + _hx509_abort("cert refcount == 0"); + return cert; +} + +/** + * Allocate an verification context that is used fo control the + * verification process. + * + * @param context A hx509 context. + * @param ctx returns a pointer to a hx509_verify_ctx object. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_verify + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_verify_init_ctx(hx509_context context, hx509_verify_ctx *ctx) +{ + hx509_verify_ctx c; + + c = calloc(1, sizeof(*c)); + if (c == NULL) + return ENOMEM; + + c->max_depth = HX509_VERIFY_MAX_DEPTH; + + *ctx = c; + + return 0; +} + +/** + * Free an hx509 verification context. + * + * @param ctx the context to be freed. + * + * @ingroup hx509_verify + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_verify_destroy_ctx(hx509_verify_ctx ctx) +{ + if (ctx) { + hx509_certs_free(&ctx->trust_anchors); + hx509_revoke_free(&ctx->revoke_ctx); + memset(ctx, 0, sizeof(*ctx)); + } + free(ctx); +} + +/** + * Set the trust anchors in the verification context, makes an + * reference to the keyset, so the consumer can free the keyset + * independent of the destruction of the verification context (ctx). + * If there already is a keyset attached, it's released. + * + * @param ctx a verification context + * @param set a keyset containing the trust anchors. + * + * @ingroup hx509_verify + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_verify_attach_anchors(hx509_verify_ctx ctx, hx509_certs set) +{ + if (ctx->trust_anchors) + hx509_certs_free(&ctx->trust_anchors); + ctx->trust_anchors = hx509_certs_ref(set); +} + +/** + * Attach an revocation context to the verfication context, , makes an + * reference to the revoke context, so the consumer can free the + * revoke context independent of the destruction of the verification + * context. If there is no revoke context, the verification process is + * NOT going to check any verification status. + * + * @param ctx a verification context. + * @param revoke_ctx a revoke context. + * + * @ingroup hx509_verify + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_verify_attach_revoke(hx509_verify_ctx ctx, hx509_revoke_ctx revoke_ctx) +{ + if (ctx->revoke_ctx) + hx509_revoke_free(&ctx->revoke_ctx); + ctx->revoke_ctx = _hx509_revoke_ref(revoke_ctx); +} + +/** + * Set the clock time the the verification process is going to + * use. Used to check certificate in the past and future time. If not + * set the current time will be used. + * + * @param ctx a verification context. + * @param t the time the verifiation is using. + * + * + * @ingroup hx509_verify + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_verify_set_time(hx509_verify_ctx ctx, time_t t) +{ + ctx->flags |= HX509_VERIFY_CTX_F_TIME_SET; + ctx->time_now = t; +} + +HX509_LIB_FUNCTION time_t HX509_LIB_CALL +_hx509_verify_get_time(hx509_verify_ctx ctx) +{ + return ctx->time_now; +} + +/** + * Set the maximum depth of the certificate chain that the path + * builder is going to try. + * + * @param ctx a verification context + * @param max_depth maxium depth of the certificate chain, include + * trust anchor. + * + * @ingroup hx509_verify + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_verify_set_max_depth(hx509_verify_ctx ctx, unsigned int max_depth) +{ + ctx->max_depth = max_depth; +} + +/** + * Allow or deny the use of proxy certificates + * + * @param ctx a verification context + * @param boolean if non zero, allow proxy certificates. + * + * @ingroup hx509_verify + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_verify_set_proxy_certificate(hx509_verify_ctx ctx, int boolean) +{ + if (boolean) + ctx->flags |= HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE; + else + ctx->flags &= ~HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE; +} + +/** + * Select strict RFC3280 verification of certificiates. This means + * checking key usage on CA certificates, this will make version 1 + * certificiates unuseable. + * + * @param ctx a verification context + * @param boolean if non zero, use strict verification. + * + * @ingroup hx509_verify + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_verify_set_strict_rfc3280_verification(hx509_verify_ctx ctx, int boolean) +{ + if (boolean) + ctx->flags |= HX509_VERIFY_CTX_F_REQUIRE_RFC3280; + else + ctx->flags &= ~HX509_VERIFY_CTX_F_REQUIRE_RFC3280; +} + +/** + * Allow using the operating system builtin trust anchors if no other + * trust anchors are configured. + * + * @param ctx a verification context + * @param boolean if non zero, useing the operating systems builtin + * trust anchors. + * + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_verify_ctx_f_allow_default_trustanchors(hx509_verify_ctx ctx, int boolean) +{ + if (boolean) + ctx->flags &= ~HX509_VERIFY_CTX_F_NO_DEFAULT_ANCHORS; + else + ctx->flags |= HX509_VERIFY_CTX_F_NO_DEFAULT_ANCHORS; +} + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_verify_ctx_f_allow_best_before_signature_algs(hx509_context ctx, + int boolean) +{ + if (boolean) + ctx->flags &= ~HX509_VERIFY_CTX_F_NO_BEST_BEFORE_CHECK; + else + ctx->flags |= HX509_VERIFY_CTX_F_NO_BEST_BEFORE_CHECK; +} + +static const Extension * +find_extension(const Certificate *cert, const heim_oid *oid, size_t *idx) +{ + const TBSCertificate *c = &cert->tbsCertificate; + + if (c->version == NULL || *c->version < 2 || c->extensions == NULL) + return NULL; + + for (;*idx < c->extensions->len; (*idx)++) { + if (der_heim_oid_cmp(&c->extensions->val[*idx].extnID, oid) == 0) + return &c->extensions->val[(*idx)++]; + } + return NULL; +} + +static int +find_extension_auth_key_id(const Certificate *subject, + AuthorityKeyIdentifier *ai) +{ + const Extension *e; + size_t size; + size_t i = 0; + + memset(ai, 0, sizeof(*ai)); + + e = find_extension(subject, &asn1_oid_id_x509_ce_authorityKeyIdentifier, &i); + if (e == NULL) + return HX509_EXTENSION_NOT_FOUND; + + return decode_AuthorityKeyIdentifier(e->extnValue.data, + e->extnValue.length, + ai, &size); +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_find_extension_subject_key_id(const Certificate *issuer, + SubjectKeyIdentifier *si) +{ + const Extension *e; + size_t size; + size_t i = 0; + + memset(si, 0, sizeof(*si)); + + e = find_extension(issuer, &asn1_oid_id_x509_ce_subjectKeyIdentifier, &i); + if (e == NULL) + return HX509_EXTENSION_NOT_FOUND; + + return decode_SubjectKeyIdentifier(e->extnValue.data, + e->extnValue.length, + si, &size); +} + +static int +find_extension_name_constraints(const Certificate *subject, + NameConstraints *nc) +{ + const Extension *e; + size_t size; + size_t i = 0; + + memset(nc, 0, sizeof(*nc)); + + e = find_extension(subject, &asn1_oid_id_x509_ce_nameConstraints, &i); + if (e == NULL) + return HX509_EXTENSION_NOT_FOUND; + + return decode_NameConstraints(e->extnValue.data, + e->extnValue.length, + nc, &size); +} + +static int +find_extension_subject_alt_name(const Certificate *cert, size_t *i, + GeneralNames *sa) +{ + const Extension *e; + size_t size; + + memset(sa, 0, sizeof(*sa)); + + e = find_extension(cert, &asn1_oid_id_x509_ce_subjectAltName, i); + if (e == NULL) + return HX509_EXTENSION_NOT_FOUND; + + return decode_GeneralNames(e->extnValue.data, + e->extnValue.length, + sa, &size); +} + +static int +find_extension_eku(const Certificate *cert, ExtKeyUsage *eku) +{ + const Extension *e; + size_t size; + size_t i = 0; + + memset(eku, 0, sizeof(*eku)); + + e = find_extension(cert, &asn1_oid_id_x509_ce_extKeyUsage, &i); + if (e == NULL) + return HX509_EXTENSION_NOT_FOUND; + + return decode_ExtKeyUsage(e->extnValue.data, + e->extnValue.length, + eku, &size); +} + +static int +add_to_list(hx509_octet_string_list *list, const heim_octet_string *entry) +{ + void *p; + int ret; + + p = realloc(list->val, (list->len + 1) * sizeof(list->val[0])); + if (p == NULL) + return ENOMEM; + list->val = p; + ret = der_copy_octet_string(entry, &list->val[list->len]); + if (ret) + return ret; + list->len++; + return 0; +} + +/** + * Free a list of octet strings returned by another hx509 library + * function. + * + * @param list list to be freed. + * + * @ingroup hx509_misc + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_free_octet_string_list(hx509_octet_string_list *list) +{ + size_t i; + + if (list->val) { + for (i = 0; i < list->len; i++) + der_free_octet_string(&list->val[i]); + free(list->val); + } + list->val = NULL; + list->len = 0; +} + +/** + * Return a list of subjectAltNames specified by oid in the + * certificate. On error the + * + * The returned list of octet string should be freed with + * hx509_free_octet_string_list(). + * + * @param context A hx509 context. + * @param cert a hx509 certificate object. + * @param oid an oid to for SubjectAltName. + * @param list list of matching SubjectAltName. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_find_subjectAltName_otherName(hx509_context context, + hx509_cert cert, + const heim_oid *oid, + hx509_octet_string_list *list) +{ + GeneralNames sa; + int ret; + size_t i, j; + + list->val = NULL; + list->len = 0; + + i = 0; + while (1) { + ret = find_extension_subject_alt_name(_hx509_get_cert(cert), &i, &sa); + i++; + if (ret == HX509_EXTENSION_NOT_FOUND) { + return 0; + } else if (ret != 0) { + hx509_set_error_string(context, 0, ret, "Error searching for SAN"); + hx509_free_octet_string_list(list); + return ret; + } + + for (j = 0; j < sa.len; j++) { + if (sa.val[j].element == choice_GeneralName_otherName && + der_heim_oid_cmp(&sa.val[j].u.otherName.type_id, oid) == 0) + { + ret = add_to_list(list, &sa.val[j].u.otherName.value); + if (ret) { + hx509_set_error_string(context, 0, ret, + "Error adding an exra SAN to " + "return list"); + hx509_free_octet_string_list(list); + free_GeneralNames(&sa); + return ret; + } + } + } + free_GeneralNames(&sa); + } +} + + +static int +check_key_usage(hx509_context context, const Certificate *cert, + unsigned flags, int req_present) +{ + const Extension *e; + KeyUsage ku; + size_t size; + int ret; + size_t i = 0; + uint64_t ku_flags; + + if (_hx509_cert_get_version(cert) < 3) + return 0; + + e = find_extension(cert, &asn1_oid_id_x509_ce_keyUsage, &i); + if (e == NULL) { + if (req_present) { + hx509_set_error_string(context, 0, HX509_KU_CERT_MISSING, + "Required extension key " + "usage missing from certificate"); + return HX509_KU_CERT_MISSING; + } + return 0; + } + + ret = decode_KeyUsage(e->extnValue.data, e->extnValue.length, &ku, &size); + if (ret) + return ret; + ku_flags = KeyUsage2int(ku); + if ((ku_flags & flags) != flags) { + uint64_t missing = (~ku_flags) & flags; + char buf[256], *name; + + int result = unparse_flags(missing, asn1_KeyUsage_units(), + buf, sizeof(buf)); + _hx509_unparse_Name(&cert->tbsCertificate.subject, &name); + hx509_set_error_string(context, 0, HX509_KU_CERT_MISSING, + "Key usage %s required but missing " + "from certificate %s", + (result > 0) ? buf : "<unknown>", + name ? name : "<unknown>"); + free(name); + return HX509_KU_CERT_MISSING; + } + return 0; +} + +/* + * Return 0 on matching key usage 'flags' for 'cert', otherwise return + * an error code. If 'req_present' the existence is required of the + * KeyUsage extension. + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_check_key_usage(hx509_context context, hx509_cert cert, + unsigned flags, int req_present) +{ + return check_key_usage(context, _hx509_get_cert(cert), flags, req_present); +} + +enum certtype { PROXY_CERT, EE_CERT, CA_CERT }; + +static int +check_basic_constraints(hx509_context context, const Certificate *cert, + enum certtype type, size_t depth) +{ + BasicConstraints bc; + const Extension *e; + size_t size; + int ret; + size_t i = 0; + + if (_hx509_cert_get_version(cert) < 3) + return 0; + + e = find_extension(cert, &asn1_oid_id_x509_ce_basicConstraints, &i); + if (e == NULL) { + switch(type) { + case PROXY_CERT: + case EE_CERT: + return 0; + case CA_CERT: { + char *name; + ret = _hx509_unparse_Name(&cert->tbsCertificate.subject, &name); + assert(ret == 0); + hx509_set_error_string(context, 0, HX509_EXTENSION_NOT_FOUND, + "basicConstraints missing from " + "CA certifiacte %s", name); + free(name); + return HX509_EXTENSION_NOT_FOUND; + } + } + } + + ret = decode_BasicConstraints(e->extnValue.data, + e->extnValue.length, &bc, + &size); + if (ret) + return ret; + switch(type) { + case PROXY_CERT: + if (bc.cA) + ret = HX509_PARENT_IS_CA; + break; + case EE_CERT: + ret = 0; + break; + case CA_CERT: + if (!bc.cA) + ret = HX509_PARENT_NOT_CA; + else if (bc.pathLenConstraint) + if (depth - 1 > *bc.pathLenConstraint) + ret = HX509_CA_PATH_TOO_DEEP; + break; + } + free_BasicConstraints(&bc); + return ret; +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_cert_is_parent_cmp(const Certificate *subject, + const Certificate *issuer, + int allow_self_signed) +{ + int diff; + AuthorityKeyIdentifier ai; + SubjectKeyIdentifier si; + int ret_ai, ret_si, ret; + + ret = _hx509_name_cmp(&issuer->tbsCertificate.subject, + &subject->tbsCertificate.issuer, + &diff); + if (ret) + return ret; + if (diff) + return diff; + + memset(&ai, 0, sizeof(ai)); + memset(&si, 0, sizeof(si)); + + /* + * Try to find AuthorityKeyIdentifier, if it's not present in the + * subject certificate nor the parent. + */ + + ret_ai = find_extension_auth_key_id(subject, &ai); + if (ret_ai && ret_ai != HX509_EXTENSION_NOT_FOUND) + return 1; + ret_si = _hx509_find_extension_subject_key_id(issuer, &si); + if (ret_si && ret_si != HX509_EXTENSION_NOT_FOUND) + return -1; + + if (ret_si && ret_ai) + goto out; + if (ret_ai) + goto out; + if (ret_si) { + if (allow_self_signed) { + diff = 0; + goto out; + } else if (ai.keyIdentifier) { + diff = -1; + goto out; + } + } + + if (ai.keyIdentifier == NULL) { + Name name; + + if (ai.authorityCertIssuer == NULL) + return -1; + if (ai.authorityCertSerialNumber == NULL) + return -1; + + diff = der_heim_integer_cmp(ai.authorityCertSerialNumber, + &issuer->tbsCertificate.serialNumber); + if (diff) + return diff; + if (ai.authorityCertIssuer->len != 1) + return -1; + if (ai.authorityCertIssuer->val[0].element != choice_GeneralName_directoryName) + return -1; + + name.element = (enum Name_enum) + ai.authorityCertIssuer->val[0].u.directoryName.element; + name.u.rdnSequence = + ai.authorityCertIssuer->val[0].u.directoryName.u.rdnSequence; + + ret = _hx509_name_cmp(&issuer->tbsCertificate.subject, + &name, + &diff); + if (ret) + return ret; + if (diff) + return diff; + diff = 0; + } else + diff = der_heim_octet_string_cmp(ai.keyIdentifier, &si); + if (diff) + goto out; + + out: + free_AuthorityKeyIdentifier(&ai); + free_SubjectKeyIdentifier(&si); + return diff; +} + +static int +certificate_is_anchor(hx509_context context, + hx509_certs trust_anchors, + const hx509_cert cert) +{ + hx509_query q; + hx509_cert c; + int ret; + + if (trust_anchors == NULL) + return 0; + + _hx509_query_clear(&q); + + q.match = HX509_QUERY_MATCH_CERTIFICATE; + q.certificate = _hx509_get_cert(cert); + + ret = hx509_certs_find(context, trust_anchors, &q, &c); + if (ret == 0) + hx509_cert_free(c); + return ret == 0; +} + +static int +certificate_is_self_signed(hx509_context context, + const Certificate *cert, + int *self_signed) +{ + int ret, diff; + ret = _hx509_name_cmp(&cert->tbsCertificate.subject, + &cert->tbsCertificate.issuer, &diff); + *self_signed = (diff == 0); + if (ret) { + hx509_set_error_string(context, 0, ret, + "Failed to check if self signed"); + } else + ret = _hx509_self_signed_valid(context, &cert->signatureAlgorithm); + + return ret; +} + +/* + * The subjectName is "null" when it's empty set of relative DBs. + */ + +static int +subject_null_p(const Certificate *c) +{ + return c->tbsCertificate.subject.u.rdnSequence.len == 0; +} + + +static int +find_parent(hx509_context context, + time_t time_now, + hx509_certs trust_anchors, + hx509_path *path, + hx509_certs pool, + hx509_cert current, + hx509_cert *parent) +{ + AuthorityKeyIdentifier ai; + hx509_query q; + int ret; + + *parent = NULL; + memset(&ai, 0, sizeof(ai)); + + _hx509_query_clear(&q); + + if (!subject_null_p(current->data)) { + q.match |= HX509_QUERY_FIND_ISSUER_CERT; + q.subject = _hx509_get_cert(current); + } else { + ret = find_extension_auth_key_id(current->data, &ai); + if (ret) { + hx509_set_error_string(context, 0, HX509_CERTIFICATE_MALFORMED, + "Subjectless certificate missing AuthKeyID"); + return HX509_CERTIFICATE_MALFORMED; + } + + if (ai.keyIdentifier == NULL) { + free_AuthorityKeyIdentifier(&ai); + hx509_set_error_string(context, 0, HX509_CERTIFICATE_MALFORMED, + "Subjectless certificate missing keyIdentifier " + "inside AuthKeyID"); + return HX509_CERTIFICATE_MALFORMED; + } + + q.subject_id = ai.keyIdentifier; + q.match = HX509_QUERY_MATCH_SUBJECT_KEY_ID; + } + + q.path = path; + q.match |= HX509_QUERY_NO_MATCH_PATH; + + if (pool) { + q.timenow = time_now; + q.match |= HX509_QUERY_MATCH_TIME; + + ret = hx509_certs_find(context, pool, &q, parent); + if (ret == 0) { + free_AuthorityKeyIdentifier(&ai); + return 0; + } + q.match &= ~HX509_QUERY_MATCH_TIME; + } + + if (trust_anchors) { + ret = hx509_certs_find(context, trust_anchors, &q, parent); + if (ret == 0) { + free_AuthorityKeyIdentifier(&ai); + return ret; + } + } + free_AuthorityKeyIdentifier(&ai); + + { + hx509_name name; + char *str; + + ret = hx509_cert_get_subject(current, &name); + if (ret) { + hx509_clear_error_string(context); + return HX509_ISSUER_NOT_FOUND; + } + ret = hx509_name_to_string(name, &str); + hx509_name_free(&name); + if (ret) { + hx509_clear_error_string(context); + return HX509_ISSUER_NOT_FOUND; + } + + hx509_set_error_string(context, 0, HX509_ISSUER_NOT_FOUND, + "Failed to find issuer for " + "certificate with subject: '%s'", str); + free(str); + } + return HX509_ISSUER_NOT_FOUND; +} + +/* + * + */ + +static int +is_proxy_cert(hx509_context context, + const Certificate *cert, + ProxyCertInfo *rinfo) +{ + ProxyCertInfo info; + const Extension *e; + size_t size; + int ret; + size_t i = 0; + + if (rinfo) + memset(rinfo, 0, sizeof(*rinfo)); + + e = find_extension(cert, &asn1_oid_id_pkix_pe_proxyCertInfo, &i); + if (e == NULL) { + hx509_clear_error_string(context); + return HX509_EXTENSION_NOT_FOUND; + } + + ret = decode_ProxyCertInfo(e->extnValue.data, + e->extnValue.length, + &info, + &size); + if (ret) { + hx509_clear_error_string(context); + return ret; + } + if (size != e->extnValue.length) { + free_ProxyCertInfo(&info); + hx509_clear_error_string(context); + return HX509_EXTRA_DATA_AFTER_STRUCTURE; + } + if (rinfo == NULL) + free_ProxyCertInfo(&info); + else + *rinfo = info; + + return 0; +} + +/* + * Path operations are like MEMORY based keyset, but with exposed + * internal so we can do easy searches. + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_path_append(hx509_context context, hx509_path *path, hx509_cert cert) +{ + hx509_cert *val; + val = realloc(path->val, (path->len + 1) * sizeof(path->val[0])); + if (val == NULL) { + hx509_set_error_string(context, 0, ENOMEM, "out of memory"); + return ENOMEM; + } + + path->val = val; + path->val[path->len] = hx509_cert_ref(cert); + path->len++; + + return 0; +} + +HX509_LIB_FUNCTION void HX509_LIB_CALL +_hx509_path_free(hx509_path *path) +{ + unsigned i; + + for (i = 0; i < path->len; i++) + hx509_cert_free(path->val[i]); + free(path->val); + path->val = NULL; + path->len = 0; +} + +/* + * Find path by looking up issuer for the top certificate and continue + * until an anchor certificate is found or max limit is found. A + * certificate never included twice in the path. + * + * If the trust anchors are not given, calculate optimistic path, just + * follow the chain upward until we no longer find a parent or we hit + * the max path limit. In this case, a failure will always be returned + * depending on what error condition is hit first. + * + * The path includes a path from the top certificate to the anchor + * certificate. + * + * The caller needs to free `path´ both on successful built path and + * failure. + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_calculate_path(hx509_context context, + int flags, + time_t time_now, + hx509_certs anchors, + unsigned int max_depth, + hx509_cert cert, + hx509_certs pool, + hx509_path *path) +{ + hx509_cert parent, current; + int ret; + + if (max_depth == 0) + max_depth = HX509_VERIFY_MAX_DEPTH; + + ret = _hx509_path_append(context, path, cert); + if (ret) + return ret; + + current = hx509_cert_ref(cert); + + while (!certificate_is_anchor(context, anchors, current)) { + + ret = find_parent(context, time_now, anchors, path, + pool, current, &parent); + hx509_cert_free(current); + if (ret) + return ret; + + ret = _hx509_path_append(context, path, parent); + if (ret) + return ret; + current = parent; + + if (path->len > max_depth) { + hx509_cert_free(current); + hx509_set_error_string(context, 0, HX509_PATH_TOO_LONG, + "Path too long while bulding " + "certificate chain"); + return HX509_PATH_TOO_LONG; + } + } + + if ((flags & HX509_CALCULATE_PATH_NO_ANCHOR) && + path->len > 0 && + certificate_is_anchor(context, anchors, path->val[path->len - 1])) + { + hx509_cert_free(path->val[path->len - 1]); + path->len--; + } + + hx509_cert_free(current); + return 0; +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_AlgorithmIdentifier_cmp(const AlgorithmIdentifier *p, + const AlgorithmIdentifier *q) +{ + int diff; + diff = der_heim_oid_cmp(&p->algorithm, &q->algorithm); + if (diff) + return diff; + if (p->parameters) { + if (q->parameters) + return heim_any_cmp(p->parameters, + q->parameters); + else + return 1; + } else { + if (q->parameters) + return -1; + else + return 0; + } +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_Certificate_cmp(const Certificate *p, const Certificate *q) +{ + int diff; + diff = der_heim_bit_string_cmp(&p->signatureValue, &q->signatureValue); + if (diff) + return diff; + diff = _hx509_AlgorithmIdentifier_cmp(&p->signatureAlgorithm, + &q->signatureAlgorithm); + if (diff) + return diff; + diff = der_heim_octet_string_cmp(&p->tbsCertificate._save, + &q->tbsCertificate._save); + return diff; +} + +/** + * Compare to hx509 certificate object, useful for sorting. + * + * @param p a hx509 certificate object. + * @param q a hx509 certificate object. + * + * @return 0 the objects are the same, returns > 0 is p is "larger" + * then q, < 0 if p is "smaller" then q. + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_cmp(hx509_cert p, hx509_cert q) +{ + return _hx509_Certificate_cmp(p->data, q->data); +} + +/** + * Return the name of the issuer of the hx509 certificate. + * + * @param p a hx509 certificate object. + * @param name a pointer to a hx509 name, should be freed by + * hx509_name_free(). + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_get_issuer(hx509_cert p, hx509_name *name) +{ + return _hx509_name_from_Name(&p->data->tbsCertificate.issuer, name); +} + +/** + * Return the name of the subject of the hx509 certificate. + * + * @param p a hx509 certificate object. + * @param name a pointer to a hx509 name, should be freed by + * hx509_name_free(). See also hx509_cert_get_base_subject(). + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_get_subject(hx509_cert p, hx509_name *name) +{ + return _hx509_name_from_Name(&p->data->tbsCertificate.subject, name); +} + +/** + * Return the name of the base subject of the hx509 certificate. If + * the certiicate is a verified proxy certificate, the this function + * return the base certificate (root of the proxy chain). If the proxy + * certificate is not verified with the base certificate + * HX509_PROXY_CERTIFICATE_NOT_CANONICALIZED is returned. + * + * @param context a hx509 context. + * @param c a hx509 certificate object. + * @param name a pointer to a hx509 name, should be freed by + * hx509_name_free(). See also hx509_cert_get_subject(). + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_get_base_subject(hx509_context context, hx509_cert c, + hx509_name *name) +{ + if (c->basename) + return hx509_name_copy(context, c->basename, name); + if (is_proxy_cert(context, c->data, NULL) == 0) { + int ret = HX509_PROXY_CERTIFICATE_NOT_CANONICALIZED; + hx509_set_error_string(context, 0, ret, + "Proxy certificate has not been " + "canonicalized yet: no base name"); + return ret; + } + return _hx509_name_from_Name(&c->data->tbsCertificate.subject, name); +} + +/** + * Get serial number of the certificate. + * + * @param p a hx509 certificate object. + * @param i serial number, should be freed ith der_free_heim_integer(). + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_get_serialnumber(hx509_cert p, heim_integer *i) +{ + return der_copy_heim_integer(&p->data->tbsCertificate.serialNumber, i); +} + +/** + * Get notBefore time of the certificate. + * + * @param p a hx509 certificate object. + * + * @return return not before time + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION time_t HX509_LIB_CALL +hx509_cert_get_notBefore(hx509_cert p) +{ + return _hx509_Time2time_t(&p->data->tbsCertificate.validity.notBefore); +} + +/** + * Get notAfter time of the certificate. + * + * @param p a hx509 certificate object. + * + * @return return not after time. + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION time_t HX509_LIB_CALL +hx509_cert_get_notAfter(hx509_cert p) +{ + return _hx509_Time2time_t(&p->data->tbsCertificate.validity.notAfter); +} + +/** + * Get a maximum Kerberos credential lifetime from a Heimdal certificate + * extension. + * + * @param context hx509 context. + * @param cert Certificate. + * @param bound If larger than zero, return no more than this. + * + * @return maximum ticket lifetime. + */ +HX509_LIB_FUNCTION time_t HX509_LIB_CALL +hx509_cert_get_pkinit_max_life(hx509_context context, + hx509_cert cert, + time_t bound) +{ + HeimPkinitPrincMaxLifeSecs r = 0; + size_t sz, i; + time_t b, e; + int ret; + + for (i = 0; i < cert->data->tbsCertificate.extensions->len; i++) { + Extension *ext = &cert->data->tbsCertificate.extensions->val[i]; + + if (ext->_ioschoice_extnValue.element != + choice_Extension_iosnumunknown && + ext->_ioschoice_extnValue.element != + choice_Extension_iosnum_id_heim_ce_pkinit_princ_max_life) + continue; + if (ext->_ioschoice_extnValue.element == choice_Extension_iosnumunknown && + der_heim_oid_cmp(&asn1_oid_id_heim_ce_pkinit_princ_max_life, &ext->extnID)) + continue; + if (ext->_ioschoice_extnValue.u.ext_HeimPkinitPrincMaxLife) { + r = *ext->_ioschoice_extnValue.u.ext_HeimPkinitPrincMaxLife; + } else { + ret = decode_HeimPkinitPrincMaxLifeSecs(ext->extnValue.data, + ext->extnValue.length, + &r, &sz); + /* No need to free_HeimPkinitPrincMaxLifeSecs(); it's an int */ + if (ret || r < 1) + return 0; + } + if (bound > 0 && r > bound) + return bound; + return r; + } + if (hx509_cert_check_eku(context, cert, + &asn1_oid_id_heim_eku_pkinit_certlife_is_max_life, 0)) + return 0; + b = hx509_cert_get_notBefore(cert); + e = hx509_cert_get_notAfter(cert); + if (e > b) + r = e - b; + if (bound > 0 && r > bound) + return bound; + return r; +} + +/** + * Get the SubjectPublicKeyInfo structure from the hx509 certificate. + * + * @param context a hx509 context. + * @param p a hx509 certificate object. + * @param spki SubjectPublicKeyInfo, should be freed with + * free_SubjectPublicKeyInfo(). + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_get_SPKI(hx509_context context, hx509_cert p, SubjectPublicKeyInfo *spki) +{ + int ret; + + ret = copy_SubjectPublicKeyInfo(&p->data->tbsCertificate.subjectPublicKeyInfo, spki); + if (ret) + hx509_set_error_string(context, 0, ret, "Failed to copy SPKI"); + return ret; +} + +/** + * Get the AlgorithmIdentifier from the hx509 certificate. + * + * @param context a hx509 context. + * @param p a hx509 certificate object. + * @param alg AlgorithmIdentifier, should be freed with + * free_AlgorithmIdentifier(). The algorithmidentifier is + * typicly rsaEncryption, or id-ecPublicKey, or some other + * public key mechanism. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_get_SPKI_AlgorithmIdentifier(hx509_context context, + hx509_cert p, + AlgorithmIdentifier *alg) +{ + int ret; + + ret = copy_AlgorithmIdentifier(&p->data->tbsCertificate.subjectPublicKeyInfo.algorithm, alg); + if (ret) + hx509_set_error_string(context, 0, ret, + "Failed to copy SPKI AlgorithmIdentifier"); + return ret; +} + +static int +get_x_unique_id(hx509_context context, const char *name, + const heim_bit_string *cert, heim_bit_string *subject) +{ + int ret; + + if (cert == NULL) { + ret = HX509_EXTENSION_NOT_FOUND; + hx509_set_error_string(context, 0, ret, "%s unique id doesn't exist", name); + return ret; + } + ret = der_copy_bit_string(cert, subject); + if (ret) { + hx509_set_error_string(context, 0, ret, "malloc out of memory", name); + return ret; + } + return 0; +} + +/** + * Get a copy of the Issuer Unique ID + * + * @param context a hx509_context + * @param p a hx509 certificate + * @param issuer the issuer id returned, free with der_free_bit_string() + * + * @return An hx509 error code, see hx509_get_error_string(). The + * error code HX509_EXTENSION_NOT_FOUND is returned if the certificate + * doesn't have a issuerUniqueID + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_get_issuer_unique_id(hx509_context context, hx509_cert p, heim_bit_string *issuer) +{ + return get_x_unique_id(context, "issuer", p->data->tbsCertificate.issuerUniqueID, issuer); +} + +/** + * Get a copy of the Subect Unique ID + * + * @param context a hx509_context + * @param p a hx509 certificate + * @param subject the subject id returned, free with der_free_bit_string() + * + * @return An hx509 error code, see hx509_get_error_string(). The + * error code HX509_EXTENSION_NOT_FOUND is returned if the certificate + * doesn't have a subjectUniqueID + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_get_subject_unique_id(hx509_context context, hx509_cert p, heim_bit_string *subject) +{ + return get_x_unique_id(context, "subject", p->data->tbsCertificate.subjectUniqueID, subject); +} + + +HX509_LIB_FUNCTION hx509_private_key HX509_LIB_CALL +_hx509_cert_private_key(hx509_cert p) +{ + return p->private_key; +} + +/** + * Indicate whether a hx509_cert has a private key. + * + * @param p a hx509 certificate + * + * @return 1 if p has a private key, 0 otherwise. + * + * @ingroup hx509_cert + */ +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_have_private_key(hx509_cert p) +{ + return p->private_key ? 1 : 0; +} + +/** + * Indicate whether a hx509_cert has a private key only (no certificate). + * + * @param p a hx509 certificate + * + * @return 1 if p has a private key only (no certificate), 0 otherwise. + * + * @ingroup hx509_cert + */ +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_have_private_key_only(hx509_cert p) +{ + return p->private_key && !p->data ? 1 : 0; +} + + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_cert_private_key_exportable(hx509_cert p) +{ + if (p->private_key == NULL) + return 0; + return _hx509_private_key_exportable(p->private_key); +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_cert_private_decrypt(hx509_context context, + const heim_octet_string *ciphertext, + const heim_oid *encryption_oid, + hx509_cert p, + heim_octet_string *cleartext) +{ + cleartext->data = NULL; + cleartext->length = 0; + + if (p->private_key == NULL) { + hx509_set_error_string(context, 0, HX509_PRIVATE_KEY_MISSING, + "Private key missing"); + return HX509_PRIVATE_KEY_MISSING; + } + + return hx509_private_key_private_decrypt(context, + ciphertext, + encryption_oid, + p->private_key, + cleartext); +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_public_encrypt(hx509_context context, + const heim_octet_string *cleartext, + const hx509_cert p, + heim_oid *encryption_oid, + heim_octet_string *ciphertext) +{ + return _hx509_public_encrypt(context, + cleartext, p->data, + encryption_oid, ciphertext); +} + +/* + * + */ + +HX509_LIB_FUNCTION time_t HX509_LIB_CALL +_hx509_Time2time_t(const Time *t) +{ + switch(t->element) { + case choice_Time_utcTime: + return t->u.utcTime; + case choice_Time_generalTime: + return t->u.generalTime; + } + return 0; +} + +/* + * + */ + +static int +init_name_constraints(hx509_name_constraints *nc) +{ + memset(nc, 0, sizeof(*nc)); + return 0; +} + +static int +add_name_constraints(hx509_context context, const Certificate *c, int not_ca, + hx509_name_constraints *nc) +{ + NameConstraints tnc; + int ret; + + ret = find_extension_name_constraints(c, &tnc); + if (ret == HX509_EXTENSION_NOT_FOUND) + return 0; + else if (ret) { + hx509_set_error_string(context, 0, ret, "Failed getting NameConstraints"); + return ret; + } else if (not_ca) { + ret = HX509_VERIFY_CONSTRAINTS; + hx509_set_error_string(context, 0, ret, "Not a CA and " + "have NameConstraints"); + } else { + NameConstraints *val; + val = realloc(nc->val, sizeof(nc->val[0]) * (nc->len + 1)); + if (val == NULL) { + hx509_clear_error_string(context); + ret = ENOMEM; + goto out; + } + nc->val = val; + ret = copy_NameConstraints(&tnc, &nc->val[nc->len]); + if (ret) { + hx509_clear_error_string(context); + goto out; + } + nc->len += 1; + } +out: + free_NameConstraints(&tnc); + return ret; +} + +static int +match_RDN(const RelativeDistinguishedName *c, + const RelativeDistinguishedName *n) +{ + size_t i; + + if (c->len != n->len) + return HX509_NAME_CONSTRAINT_ERROR; + + for (i = 0; i < n->len; i++) { + int diff, ret; + + if (der_heim_oid_cmp(&c->val[i].type, &n->val[i].type) != 0) + return HX509_NAME_CONSTRAINT_ERROR; + ret = _hx509_name_ds_cmp(&c->val[i].value, &n->val[i].value, &diff); + if (ret) + return ret; + if (diff != 0) + return HX509_NAME_CONSTRAINT_ERROR; + } + return 0; +} + +static int +match_X501Name(const Name *c, const Name *n) +{ + size_t i; + int ret; + + if (c->element != choice_Name_rdnSequence + || n->element != choice_Name_rdnSequence) + return 0; + if (c->u.rdnSequence.len > n->u.rdnSequence.len) + return HX509_NAME_CONSTRAINT_ERROR; + for (i = 0; i < c->u.rdnSequence.len; i++) { + ret = match_RDN(&c->u.rdnSequence.val[i], &n->u.rdnSequence.val[i]); + if (ret) + return ret; + } + return 0; +} + + +static int +match_general_name(const GeneralName *c, const GeneralName *n, int *match) +{ + /* + * Name constraints only apply to the same name type, see RFC3280, + * 4.2.1.11. + */ + assert(c->element == n->element); + + switch(c->element) { + case choice_GeneralName_otherName: + if (der_heim_oid_cmp(&c->u.otherName.type_id, + &n->u.otherName.type_id) != 0) + return HX509_NAME_CONSTRAINT_ERROR; + if (heim_any_cmp(&c->u.otherName.value, + &n->u.otherName.value) != 0) + return HX509_NAME_CONSTRAINT_ERROR; + *match = 1; + return 0; + case choice_GeneralName_rfc822Name: { + const char *s; + size_t len1, len2; + s = memchr(c->u.rfc822Name.data, '@', c->u.rfc822Name.length); + if (s) { + if (der_printable_string_cmp(&c->u.rfc822Name, &n->u.rfc822Name) != 0) + return HX509_NAME_CONSTRAINT_ERROR; + } else { + s = memchr(n->u.rfc822Name.data, '@', n->u.rfc822Name.length); + if (s == NULL) + return HX509_NAME_CONSTRAINT_ERROR; + len1 = c->u.rfc822Name.length; + len2 = n->u.rfc822Name.length - + (s - ((char *)n->u.rfc822Name.data)); + if (len1 > len2) + return HX509_NAME_CONSTRAINT_ERROR; + if (memcmp(s + 1 + len2 - len1, c->u.rfc822Name.data, len1) != 0) + return HX509_NAME_CONSTRAINT_ERROR; + if (len1 < len2 && s[len2 - len1 + 1] != '.') + return HX509_NAME_CONSTRAINT_ERROR; + } + *match = 1; + return 0; + } + case choice_GeneralName_dNSName: { + size_t lenc, lenn; + char *ptr; + + lenc = c->u.dNSName.length; + lenn = n->u.dNSName.length; + if (lenc > lenn) + return HX509_NAME_CONSTRAINT_ERROR; + ptr = n->u.dNSName.data; + if (memcmp(&ptr[lenn - lenc], c->u.dNSName.data, lenc) != 0) + return HX509_NAME_CONSTRAINT_ERROR; + if (lenn != lenc && ptr[lenn - lenc - 1] != '.') + return HX509_NAME_CONSTRAINT_ERROR; + *match = 1; + return 0; + } + case choice_GeneralName_directoryName: { + Name c_name, n_name; + int ret; + + c_name._save.data = NULL; + c_name._save.length = 0; + c_name.element = (enum Name_enum)c->u.directoryName.element; + c_name.u.rdnSequence = c->u.directoryName.u.rdnSequence; + + n_name._save.data = NULL; + n_name._save.length = 0; + n_name.element = (enum Name_enum)n->u.directoryName.element; + n_name.u.rdnSequence = n->u.directoryName.u.rdnSequence; + + ret = match_X501Name(&c_name, &n_name); + if (ret == 0) + *match = 1; + return ret; + } + case choice_GeneralName_uniformResourceIdentifier: + case choice_GeneralName_iPAddress: + case choice_GeneralName_registeredID: + default: + return HX509_NAME_CONSTRAINT_ERROR; + } +} + +static int +match_alt_name(const GeneralName *n, const Certificate *c, + int *same, int *match) +{ + GeneralNames sa; + int ret = 0; + size_t i, j; + + i = 0; + do { + ret = find_extension_subject_alt_name(c, &i, &sa); + if (ret == HX509_EXTENSION_NOT_FOUND) { + ret = 0; + break; + } else if (ret != 0) + break; + + for (j = 0; j < sa.len; j++) { + if (n->element == sa.val[j].element) { + *same = 1; + match_general_name(n, &sa.val[j], match); + } + } + free_GeneralNames(&sa); + } while (1); + return ret; +} + + +static int +match_tree(const GeneralSubtrees *t, const Certificate *c, int *match) +{ + int name, alt_name, same; + unsigned int i; + int ret = 0; + + name = alt_name = same = *match = 0; + for (i = 0; i < t->len; i++) { + if (t->val[i].minimum && t->val[i].maximum) + return HX509_RANGE; + + /* + * If the constraint apply to directoryNames, test is with + * subjectName of the certificate if the certificate have a + * non-null (empty) subjectName. + */ + + if (t->val[i].base.element == choice_GeneralName_directoryName + && !subject_null_p(c)) + { + GeneralName certname; + + memset(&certname, 0, sizeof(certname)); + certname.element = choice_GeneralName_directoryName; + certname.u.directoryName.element = (enum Name_enum) + c->tbsCertificate.subject.element; + certname.u.directoryName.u.rdnSequence = + c->tbsCertificate.subject.u.rdnSequence; + + match_general_name(&t->val[i].base, &certname, &name); + } + + /* Handle subjectAltNames, this is icky since they + * restrictions only apply if the subjectAltName is of the + * same type. So if there have been a match of type, require + * altname to be set. + */ + match_alt_name(&t->val[i].base, c, &same, &alt_name); + } + if (name && (!same || alt_name)) + *match = 1; + return ret; +} + +static int +check_name_constraints(hx509_context context, + const hx509_name_constraints *nc, + const Certificate *c) +{ + int match, ret; + size_t i; + + for (i = 0 ; i < nc->len; i++) { + GeneralSubtrees gs; + + if (nc->val[i].permittedSubtrees) { + GeneralSubtrees_SET(&gs, nc->val[i].permittedSubtrees); + ret = match_tree(&gs, c, &match); + if (ret) { + hx509_clear_error_string(context); + return ret; + } + /* allow null subjectNames, they wont matches anything */ + if (match == 0 && !subject_null_p(c)) { + hx509_set_error_string(context, 0, HX509_VERIFY_CONSTRAINTS, + "Error verifying constraints: " + "certificate didn't match any " + "permitted subtree"); + return HX509_VERIFY_CONSTRAINTS; + } + } + if (nc->val[i].excludedSubtrees) { + GeneralSubtrees_SET(&gs, nc->val[i].excludedSubtrees); + ret = match_tree(&gs, c, &match); + if (ret) { + hx509_clear_error_string(context); + return ret; + } + if (match) { + hx509_set_error_string(context, 0, HX509_VERIFY_CONSTRAINTS, + "Error verifying constraints: " + "certificate included in excluded " + "subtree"); + return HX509_VERIFY_CONSTRAINTS; + } + } + } + return 0; +} + +static void +free_name_constraints(hx509_name_constraints *nc) +{ + size_t i; + + for (i = 0 ; i < nc->len; i++) + free_NameConstraints(&nc->val[i]); + free(nc->val); +} + +/** + * Build and verify the path for the certificate to the trust anchor + * specified in the verify context. The path is constructed from the + * certificate, the pool and the trust anchors. + * + * @param context A hx509 context. + * @param ctx A hx509 verification context. + * @param cert the certificate to build the path from. + * @param pool A keyset of certificates to build the chain from. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_verify + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_verify_path(hx509_context context, + hx509_verify_ctx ctx, + hx509_cert cert, + hx509_certs pool) +{ + hx509_name_constraints nc; + hx509_path path; + int ret, proxy_cert_depth, selfsigned_depth, diff; + size_t i, k; + enum certtype type; + Name proxy_issuer; + hx509_certs anchors = NULL; + + memset(&proxy_issuer, 0, sizeof(proxy_issuer)); + + if ((ctx->flags & HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE) == 0 && + is_proxy_cert(context, cert->data, NULL) == 0) + { + ret = HX509_PROXY_CERT_INVALID; + hx509_set_error_string(context, 0, ret, + "Proxy certificate is not allowed as an EE " + "certificate if proxy certificate is disabled"); + return ret; + } + + ret = init_name_constraints(&nc); + if (ret) + return ret; + + path.val = NULL; + path.len = 0; + + if ((ctx->flags & HX509_VERIFY_CTX_F_TIME_SET) == 0) + ctx->time_now = time(NULL); + + /* + * + */ + if (ctx->trust_anchors) + anchors = hx509_certs_ref(ctx->trust_anchors); + else if (context->default_trust_anchors && ALLOW_DEF_TA(ctx)) + anchors = hx509_certs_ref(context->default_trust_anchors); + else { + ret = hx509_certs_init(context, "MEMORY:no-TA", 0, NULL, &anchors); + if (ret) + goto out; + } + + /* + * Calculate the path from the certificate user presented to the + * to an anchor. + */ + ret = _hx509_calculate_path(context, 0, ctx->time_now, + anchors, ctx->max_depth, + cert, pool, &path); + if (ret) + goto out; + + /* + * Check CA and proxy certificate chain from the top of the + * certificate chain. Also check certificate is valid with respect + * to the current time. + * + */ + + proxy_cert_depth = 0; + selfsigned_depth = 0; + + if (ctx->flags & HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE) + type = PROXY_CERT; + else + type = EE_CERT; + + for (i = 0; i < path.len; i++) { + Certificate *c; + time_t t; + + c = _hx509_get_cert(path.val[i]); + + /* + * Lets do some basic check on issuer like + * keyUsage.keyCertSign and basicConstraints.cA bit depending + * on what type of certificate this is. + */ + + switch (type) { + case CA_CERT: + + /* XXX make constants for keyusage */ + ret = check_key_usage(context, c, 1 << 5, + REQUIRE_RFC3280(ctx) ? TRUE : FALSE); + if (ret) { + hx509_set_error_string(context, HX509_ERROR_APPEND, ret, + "Key usage missing from CA certificate"); + goto out; + } + + /* self signed cert doesn't add to path length */ + if (i + 1 != path.len) { + int selfsigned; + + ret = certificate_is_self_signed(context, c, &selfsigned); + if (ret) + goto out; + if (selfsigned) + selfsigned_depth++; + } + + break; + case PROXY_CERT: { + ProxyCertInfo info; + + if (is_proxy_cert(context, c, &info) == 0) { + size_t j; + + if (info.pCPathLenConstraint != NULL && + *info.pCPathLenConstraint < i) + { + free_ProxyCertInfo(&info); + ret = HX509_PATH_TOO_LONG; + hx509_set_error_string(context, 0, ret, + "Proxy certificate chain " + "longer than allowed"); + goto out; + } + /* XXX MUST check info.proxyPolicy */ + free_ProxyCertInfo(&info); + + j = 0; + if (find_extension(c, &asn1_oid_id_x509_ce_subjectAltName, &j)) { + ret = HX509_PROXY_CERT_INVALID; + hx509_set_error_string(context, 0, ret, + "Proxy certificate has explicitly " + "forbidden subjectAltName"); + goto out; + } + + j = 0; + if (find_extension(c, &asn1_oid_id_x509_ce_issuerAltName, &j)) { + ret = HX509_PROXY_CERT_INVALID; + hx509_set_error_string(context, 0, ret, + "Proxy certificate has explicitly " + "forbidden issuerAltName"); + goto out; + } + + /* + * The subject name of the proxy certificate should be + * CN=XXX,<proxy issuer>, prune of CN and check if its + * the same over the whole chain of proxy certs and + * then check with the EE cert when we get to it. + */ + + if (proxy_cert_depth) { + ret = _hx509_name_cmp(&proxy_issuer, &c->tbsCertificate.subject, &diff); + if (ret) { + hx509_set_error_string(context, 0, ret, "Out of memory"); + goto out; + } + if (diff) { + ret = HX509_PROXY_CERT_NAME_WRONG; + hx509_set_error_string(context, 0, ret, + "Base proxy name not right"); + goto out; + } + } + + free_Name(&proxy_issuer); + + ret = copy_Name(&c->tbsCertificate.subject, &proxy_issuer); + if (ret) { + hx509_clear_error_string(context); + goto out; + } + + j = proxy_issuer.u.rdnSequence.len; + if (proxy_issuer.u.rdnSequence.len < 2 + || proxy_issuer.u.rdnSequence.val[j - 1].len > 1 + || der_heim_oid_cmp(&proxy_issuer.u.rdnSequence.val[j - 1].val[0].type, + &asn1_oid_id_at_commonName)) + { + ret = HX509_PROXY_CERT_NAME_WRONG; + hx509_set_error_string(context, 0, ret, + "Proxy name too short or " + "does not have Common name " + "at the top"); + goto out; + } + + free_RelativeDistinguishedName(&proxy_issuer.u.rdnSequence.val[j - 1]); + proxy_issuer.u.rdnSequence.len -= 1; + + ret = _hx509_name_cmp(&proxy_issuer, &c->tbsCertificate.issuer, &diff); + if (ret) { + hx509_set_error_string(context, 0, ret, "Out of memory"); + goto out; + } + if (diff != 0) { + ret = HX509_PROXY_CERT_NAME_WRONG; + hx509_set_error_string(context, 0, ret, + "Proxy issuer name not as expected"); + goto out; + } + + break; + } else { + /* + * Now we are done with the proxy certificates, this + * cert was an EE cert and we we will fall though to + * EE checking below. + */ + type = EE_CERT; + } + } + fallthrough; + case EE_CERT: + /* + * If there where any proxy certificates in the chain + * (proxy_cert_depth > 0), check that the proxy issuer + * matched proxy certificates "base" subject. + */ + if (proxy_cert_depth) { + + ret = _hx509_name_cmp(&proxy_issuer, + &c->tbsCertificate.subject, &diff); + if (ret) { + hx509_set_error_string(context, 0, ret, "out of memory"); + goto out; + } + if (diff) { + ret = HX509_PROXY_CERT_NAME_WRONG; + hx509_clear_error_string(context); + goto out; + } + if (cert->basename) + hx509_name_free(&cert->basename); + + ret = _hx509_name_from_Name(&proxy_issuer, &cert->basename); + if (ret) { + hx509_clear_error_string(context); + goto out; + } + } + + break; + } + + ret = check_basic_constraints(context, c, type, + i - proxy_cert_depth - selfsigned_depth); + if (ret) + goto out; + + /* + * Don't check the trust anchors expiration time since they + * are transported out of band, from RFC3820. + */ + if (i + 1 != path.len || CHECK_TA(ctx)) { + + t = _hx509_Time2time_t(&c->tbsCertificate.validity.notBefore); + if (t > ctx->time_now) { + ret = HX509_CERT_USED_BEFORE_TIME; + hx509_clear_error_string(context); + goto out; + } + t = _hx509_Time2time_t(&c->tbsCertificate.validity.notAfter); + if (t < ctx->time_now) { + ret = HX509_CERT_USED_AFTER_TIME; + hx509_clear_error_string(context); + goto out; + } + } + + if (type == EE_CERT) + type = CA_CERT; + else if (type == PROXY_CERT) + proxy_cert_depth++; + } + + /* + * Verify constraints, do this backward so path constraints are + * checked in the right order. + */ + + for (ret = 0, k = path.len; k > 0; k--) { + Certificate *c; + int selfsigned; + i = k - 1; + + c = _hx509_get_cert(path.val[i]); + + ret = certificate_is_self_signed(context, c, &selfsigned); + if (ret) + goto out; + + /* verify name constraints, not for selfsigned and anchor */ + if (!selfsigned || i + 1 != path.len) { + ret = check_name_constraints(context, &nc, c); + if (ret) { + goto out; + } + } + ret = add_name_constraints(context, c, i == 0, &nc); + if (ret) + goto out; + + /* XXX verify all other silly constraints */ + + } + + /* + * Verify that no certificates has been revoked. + */ + + if (ctx->revoke_ctx) { + hx509_certs certs; + + ret = hx509_certs_init(context, "MEMORY:revoke-certs", 0, + NULL, &certs); + if (ret) + goto out; + + for (i = 0; i < path.len; i++) { + ret = hx509_certs_add(context, certs, path.val[i]); + if (ret) { + hx509_certs_free(&certs); + goto out; + } + } + ret = hx509_certs_merge(context, certs, pool); + if (ret) { + hx509_certs_free(&certs); + goto out; + } + + for (i = 0; i < path.len - 1; i++) { + size_t parent = (i < path.len - 1) ? i + 1 : i; + + ret = hx509_revoke_verify(context, + ctx->revoke_ctx, + certs, + ctx->time_now, + path.val[i], + path.val[parent]); + if (ret) { + hx509_certs_free(&certs); + goto out; + } + } + hx509_certs_free(&certs); + } + + /* + * Verify signatures, do this backward so public key working + * parameter is passed up from the anchor up though the chain. + */ + + for (k = path.len; k > 0; k--) { + hx509_cert signer; + Certificate *c; + i = k - 1; + + c = _hx509_get_cert(path.val[i]); + + /* is last in chain (trust anchor) */ + if (i + 1 == path.len) { + int selfsigned; + + signer = path.val[i]; + + ret = certificate_is_self_signed(context, signer->data, &selfsigned); + if (ret) + goto out; + + /* if trust anchor is not self signed, don't check sig */ + if (!selfsigned) + continue; + } else { + /* take next certificate in chain */ + signer = path.val[i + 1]; + } + + /* verify signatureValue */ + ret = _hx509_verify_signature_bitstring(context, + signer, + &c->signatureAlgorithm, + &c->tbsCertificate._save, + &c->signatureValue); + if (ret) { + hx509_set_error_string(context, HX509_ERROR_APPEND, ret, + "Failed to verify signature of certificate"); + goto out; + } + /* + * Verify that the sigature algorithm is not weak. Ignore + * trust anchors since they are provisioned by the user. + */ + + if (i + 1 != path.len && (ctx->flags & HX509_VERIFY_CTX_F_NO_BEST_BEFORE_CHECK) == 0) { + ret = _hx509_signature_is_weak(context, &c->signatureAlgorithm); + if (ret) + goto out; + } + } + +out: + hx509_certs_free(&anchors); + free_Name(&proxy_issuer); + free_name_constraints(&nc); + _hx509_path_free(&path); + + return ret; +} + +/** + * Verify a signature made using the private key of an certificate. + * + * @param context A hx509 context. + * @param signer the certificate that made the signature. + * @param alg algorthm that was used to sign the data. + * @param data the data that was signed. + * @param sig the sigature to verify. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_crypto + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_verify_signature(hx509_context context, + const hx509_cert signer, + const AlgorithmIdentifier *alg, + const heim_octet_string *data, + const heim_octet_string *sig) +{ + return _hx509_verify_signature(context, signer, alg, data, sig); +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_verify_signature_bitstring(hx509_context context, + const hx509_cert signer, + const AlgorithmIdentifier *alg, + const heim_octet_string *data, + const heim_bit_string *sig) +{ + heim_octet_string os; + + if (sig->length & 7) { + hx509_set_error_string(context, 0, HX509_CRYPTO_SIG_INVALID_FORMAT, + "signature not multiple of 8 bits"); + return HX509_CRYPTO_SIG_INVALID_FORMAT; + } + + os.data = sig->data; + os.length = sig->length / 8; + + return _hx509_verify_signature(context, signer, alg, data, &os); +} + + + +/** + * Verify that the certificate is allowed to be used for the hostname + * and address. + * + * @param context A hx509 context. + * @param cert the certificate to match with + * @param flags Flags to modify the behavior: + * - HX509_VHN_F_ALLOW_NO_MATCH no match is ok + * @param type type of hostname: + * - HX509_HN_HOSTNAME for plain hostname. + * - HX509_HN_DNSSRV for DNS SRV names. + * @param hostname the hostname to check + * @param sa address of the host + * @param sa_size length of address + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_verify_hostname(hx509_context context, + const hx509_cert cert, + int flags, + hx509_hostname_type type, + const char *hostname, + const struct sockaddr *sa, + /* XXX krb5_socklen_t */ int sa_size) +{ + GeneralNames san; + const Name *name; + int ret; + size_t i, j, k; + + if (sa && sa_size <= 0) + return EINVAL; + + memset(&san, 0, sizeof(san)); + + i = 0; + do { + ret = find_extension_subject_alt_name(cert->data, &i, &san); + if (ret == HX509_EXTENSION_NOT_FOUND) + break; + else if (ret != 0) + return HX509_PARSING_NAME_FAILED; + + for (j = 0; j < san.len; j++) { + switch (san.val[j].element) { + case choice_GeneralName_dNSName: { + heim_printable_string hn; + hn.data = rk_UNCONST(hostname); + hn.length = strlen(hostname); + + if (der_printable_string_cmp(&san.val[j].u.dNSName, &hn) == 0) { + free_GeneralNames(&san); + return 0; + } + break; + } + default: + break; + } + } + free_GeneralNames(&san); + } while (1); + + name = &cert->data->tbsCertificate.subject; + + /* Find first CN= in the name, and try to match the hostname on that */ + for (ret = 0, k = name->u.rdnSequence.len; ret == 0 && k > 0; k--) { + i = k - 1; + for (j = 0; ret == 0 && j < name->u.rdnSequence.val[i].len; j++) { + AttributeTypeAndValue *n = &name->u.rdnSequence.val[i].val[j]; + + if (der_heim_oid_cmp(&n->type, &asn1_oid_id_at_commonName) == 0) { + DirectoryString *ds = &n->value; + switch (ds->element) { + case choice_DirectoryString_printableString: { + heim_printable_string hn; + hn.data = rk_UNCONST(hostname); + hn.length = strlen(hostname); + + if (der_printable_string_cmp(&ds->u.printableString, &hn) == 0) + return 0; + break; + } + case choice_DirectoryString_ia5String: { + heim_ia5_string hn; + hn.data = rk_UNCONST(hostname); + hn.length = strlen(hostname); + + if (der_ia5_string_cmp(&ds->u.ia5String, &hn) == 0) + return 0; + break; + } + case choice_DirectoryString_utf8String: + if (strcasecmp(ds->u.utf8String, hostname) == 0) + return 0; + default: + break; + } + ret = HX509_NAME_CONSTRAINT_ERROR; + } + } + } + + if ((flags & HX509_VHN_F_ALLOW_NO_MATCH) == 0) + ret = HX509_NAME_CONSTRAINT_ERROR; + + return ret; +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_set_cert_attribute(hx509_context context, + hx509_cert cert, + const heim_oid *oid, + const heim_octet_string *attr) +{ + hx509_cert_attribute a; + void *d; + int ret; + + /* + * TODO: Rewrite this (and hx509_cert_attribute, and _hx509_cert_attrs) to + * use the add_AttributeValues() util generated by asn1_compile. + */ + + if (hx509_cert_get_attribute(cert, oid) != NULL) + return 0; + + d = realloc(cert->attrs.val, + sizeof(cert->attrs.val[0]) * (cert->attrs.len + 1)); + if (d == NULL) { + hx509_clear_error_string(context); + return ENOMEM; + } + cert->attrs.val = d; + + a = malloc(sizeof(*a)); + if (a == NULL) + return ENOMEM; + + ret = der_copy_octet_string(attr, &a->data); + if (ret == 0) + ret = der_copy_oid(oid, &a->oid); + if (ret == 0) { + cert->attrs.val[cert->attrs.len] = a; + cert->attrs.len++; + } else { + der_free_octet_string(&a->data); + free(a); + } + + return ret; +} + +/** + * Get an external attribute for the certificate, examples are + * friendly name and id. + * + * @param cert hx509 certificate object to search + * @param oid an oid to search for. + * + * @return an hx509_cert_attribute, only valid as long as the + * certificate is referenced. + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION hx509_cert_attribute HX509_LIB_CALL +hx509_cert_get_attribute(hx509_cert cert, const heim_oid *oid) +{ + size_t i; + for (i = 0; i < cert->attrs.len; i++) + if (der_heim_oid_cmp(oid, &cert->attrs.val[i]->oid) == 0) + return cert->attrs.val[i]; + return NULL; +} + +/** + * Set the friendly name on the certificate. + * + * @param cert The certificate to set the friendly name on + * @param name Friendly name. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_set_friendly_name(hx509_cert cert, const char *name) +{ + if (cert->friendlyname) + free(cert->friendlyname); + cert->friendlyname = strdup(name); + if (cert->friendlyname == NULL) + return ENOMEM; + return 0; +} + +/** + * Get friendly name of the certificate. + * + * @param cert cert to get the friendly name from. + * + * @return an friendly name or NULL if there is. The friendly name is + * only valid as long as the certificate is referenced. + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION const char * HX509_LIB_CALL +hx509_cert_get_friendly_name(hx509_cert cert) +{ + hx509_cert_attribute a; + PKCS9_friendlyName n; + size_t sz; + int ret; + size_t i; + + if (cert->friendlyname) + return cert->friendlyname; + + a = hx509_cert_get_attribute(cert, &asn1_oid_id_pkcs_9_at_friendlyName); + if (a == NULL) { + hx509_name name; + + ret = hx509_cert_get_subject(cert, &name); + if (ret) + return NULL; + ret = hx509_name_to_string(name, &cert->friendlyname); + hx509_name_free(&name); + if (ret) + return NULL; + return cert->friendlyname; + } + + ret = decode_PKCS9_friendlyName(a->data.data, a->data.length, &n, &sz); + if (ret) + return NULL; + + if (n.len != 1) { + free_PKCS9_friendlyName(&n); + return NULL; + } + + cert->friendlyname = malloc(n.val[0].length + 1); + if (cert->friendlyname == NULL) { + free_PKCS9_friendlyName(&n); + return NULL; + } + + for (i = 0; i < n.val[0].length; i++) { + if (n.val[0].data[i] <= 0xff) + cert->friendlyname[i] = n.val[0].data[i] & 0xff; + else + cert->friendlyname[i] = 'X'; + } + cert->friendlyname[i] = '\0'; + free_PKCS9_friendlyName(&n); + + return cert->friendlyname; +} + +HX509_LIB_FUNCTION void HX509_LIB_CALL +_hx509_query_clear(hx509_query *q) +{ + memset(q, 0, sizeof(*q)); +} + +/** + * Allocate an query controller. Free using hx509_query_free(). + * + * @param context A hx509 context. + * @param q return pointer to a hx509_query. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_query_alloc(hx509_context context, hx509_query **q) +{ + *q = calloc(1, sizeof(**q)); + if (*q == NULL) + return ENOMEM; + return 0; +} + + +/** + * Set match options for the hx509 query controller. + * + * @param q query controller. + * @param option options to control the query controller. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_query_match_option(hx509_query *q, hx509_query_option option) +{ + switch(option) { + case HX509_QUERY_OPTION_PRIVATE_KEY: + q->match |= HX509_QUERY_PRIVATE_KEY; + break; + case HX509_QUERY_OPTION_KU_ENCIPHERMENT: + q->match |= HX509_QUERY_KU_ENCIPHERMENT; + break; + case HX509_QUERY_OPTION_KU_DIGITALSIGNATURE: + q->match |= HX509_QUERY_KU_DIGITALSIGNATURE; + break; + case HX509_QUERY_OPTION_KU_KEYCERTSIGN: + q->match |= HX509_QUERY_KU_KEYCERTSIGN; + break; + case HX509_QUERY_OPTION_END: + default: + break; + } +} + +/** + * Set the issuer and serial number of match in the query + * controller. The function make copies of the isser and serial number. + * + * @param q a hx509 query controller + * @param issuer issuer to search for + * @param serialNumber the serialNumber of the issuer. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_query_match_issuer_serial(hx509_query *q, + const Name *issuer, + const heim_integer *serialNumber) +{ + int ret; + if (q->serial) { + der_free_heim_integer(q->serial); + free(q->serial); + } + q->serial = malloc(sizeof(*q->serial)); + if (q->serial == NULL) + return ENOMEM; + ret = der_copy_heim_integer(serialNumber, q->serial); + if (ret) { + free(q->serial); + q->serial = NULL; + return ret; + } + if (q->issuer_name) { + free_Name(q->issuer_name); + free(q->issuer_name); + } + q->issuer_name = malloc(sizeof(*q->issuer_name)); + if (q->issuer_name == NULL) + return ENOMEM; + ret = copy_Name(issuer, q->issuer_name); + if (ret) { + free(q->issuer_name); + q->issuer_name = NULL; + return ret; + } + q->match |= HX509_QUERY_MATCH_SERIALNUMBER|HX509_QUERY_MATCH_ISSUER_NAME; + return 0; +} + +/** + * Set the query controller to match on a friendly name + * + * @param q a hx509 query controller. + * @param name a friendly name to match on + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_query_match_friendly_name(hx509_query *q, const char *name) +{ + if (q->friendlyname) + free(q->friendlyname); + q->friendlyname = strdup(name); + if (q->friendlyname == NULL) + return ENOMEM; + q->match |= HX509_QUERY_MATCH_FRIENDLY_NAME; + return 0; +} + +/** + * Set the query controller to require an one specific EKU (extended + * key usage). Any previous EKU matching is overwitten. If NULL is + * passed in as the eku, the EKU requirement is reset. + * + * @param q a hx509 query controller. + * @param eku an EKU to match on. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_query_match_eku(hx509_query *q, const heim_oid *eku) +{ + int ret; + + if (eku == NULL) { + if (q->eku) { + der_free_oid(q->eku); + free(q->eku); + q->eku = NULL; + } + q->match &= ~HX509_QUERY_MATCH_EKU; + } else { + if (q->eku) { + der_free_oid(q->eku); + } else { + q->eku = calloc(1, sizeof(*q->eku)); + if (q->eku == NULL) + return ENOMEM; + } + ret = der_copy_oid(eku, q->eku); + if (ret) { + free(q->eku); + q->eku = NULL; + return ret; + } + q->match |= HX509_QUERY_MATCH_EKU; + } + return 0; +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_query_match_expr(hx509_context context, hx509_query *q, const char *expr) +{ + if (q->expr) { + _hx509_expr_free(q->expr); + q->expr = NULL; + } + + if (expr == NULL) { + q->match &= ~HX509_QUERY_MATCH_EXPR; + return 0; + } + + q->expr = _hx509_expr_parse(expr); + if (q->expr == NULL) { + const char *reason = _hx509_expr_parse_error(); + + hx509_set_error_string(context, 0, EINVAL, + "Invalid certificate query match expression: " + "%s (%s)", expr, + reason ? reason : "syntax error"); + return EINVAL; + } + + q->match |= HX509_QUERY_MATCH_EXPR; + return 0; +} + +/** + * Set the query controller to match using a specific match function. + * + * @param q a hx509 query controller. + * @param func function to use for matching, if the argument is NULL, + * the match function is removed. + * @param ctx context passed to the function. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_query_match_cmp_func(hx509_query *q, + int (*func)(hx509_context, hx509_cert, void *), + void *ctx) +{ + if (func) + q->match |= HX509_QUERY_MATCH_FUNCTION; + else + q->match &= ~HX509_QUERY_MATCH_FUNCTION; + q->cmp_func = func; + q->cmp_func_ctx = ctx; + return 0; +} + +/** + * Free the query controller. + * + * @param context A hx509 context. + * @param q a pointer to the query controller. + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_query_free(hx509_context context, hx509_query *q) +{ + if (q == NULL) + return; + + if (q->serial) { + der_free_heim_integer(q->serial); + free(q->serial); + } + if (q->issuer_name) { + free_Name(q->issuer_name); + free(q->issuer_name); + } + if (q->eku) { + der_free_oid(q->eku); + free(q->eku); + } + if (q->friendlyname) + free(q->friendlyname); + if (q->expr) + _hx509_expr_free(q->expr); + + memset(q, 0, sizeof(*q)); + free(q); +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_query_match_cert(hx509_context context, const hx509_query *q, hx509_cert cert) +{ + Certificate *c = _hx509_get_cert(cert); + int ret, diff; + + _hx509_query_statistic(context, 1, q); + + if ((q->match & HX509_QUERY_FIND_ISSUER_CERT) && + _hx509_cert_is_parent_cmp(q->subject, c, 0) != 0) + return 0; + + if ((q->match & HX509_QUERY_MATCH_CERTIFICATE) && + _hx509_Certificate_cmp(q->certificate, c) != 0) + return 0; + + if ((q->match & HX509_QUERY_MATCH_SERIALNUMBER) + && der_heim_integer_cmp(&c->tbsCertificate.serialNumber, q->serial) != 0) + return 0; + + if (q->match & HX509_QUERY_MATCH_ISSUER_NAME) { + ret = _hx509_name_cmp(&c->tbsCertificate.issuer, q->issuer_name, &diff); + if (ret || diff) + return 0; + } + + if (q->match & HX509_QUERY_MATCH_SUBJECT_NAME) { + ret = _hx509_name_cmp(&c->tbsCertificate.subject, q->subject_name, &diff); + if (ret || diff) + return 0; + } + + if (q->match & HX509_QUERY_MATCH_SUBJECT_KEY_ID) { + SubjectKeyIdentifier si; + + ret = _hx509_find_extension_subject_key_id(c, &si); + if (ret == 0) { + if (der_heim_octet_string_cmp(&si, q->subject_id) != 0) + ret = 1; + free_SubjectKeyIdentifier(&si); + } + if (ret) + return 0; + } + if ((q->match & HX509_QUERY_MATCH_ISSUER_ID)) + return 0; + if ((q->match & HX509_QUERY_PRIVATE_KEY) && + _hx509_cert_private_key(cert) == NULL) + return 0; + + { + unsigned ku = 0; + if (q->match & HX509_QUERY_KU_DIGITALSIGNATURE) + ku |= (1 << 0); + if (q->match & HX509_QUERY_KU_NONREPUDIATION) + ku |= (1 << 1); + if (q->match & HX509_QUERY_KU_ENCIPHERMENT) + ku |= (1 << 2); + if (q->match & HX509_QUERY_KU_DATAENCIPHERMENT) + ku |= (1 << 3); + if (q->match & HX509_QUERY_KU_KEYAGREEMENT) + ku |= (1 << 4); + if (q->match & HX509_QUERY_KU_KEYCERTSIGN) + ku |= (1 << 5); + if (q->match & HX509_QUERY_KU_CRLSIGN) + ku |= (1 << 6); + if (ku && check_key_usage(context, c, ku, TRUE)) + return 0; + } + if ((q->match & HX509_QUERY_ANCHOR)) + return 0; + + if (q->match & HX509_QUERY_MATCH_LOCAL_KEY_ID) { + hx509_cert_attribute a; + + a = hx509_cert_get_attribute(cert, &asn1_oid_id_pkcs_9_at_localKeyId); + if (a == NULL) + return 0; + if (der_heim_octet_string_cmp(&a->data, q->local_key_id) != 0) + return 0; + } + + if (q->match & HX509_QUERY_NO_MATCH_PATH) { + size_t i; + + for (i = 0; i < q->path->len; i++) + if (hx509_cert_cmp(q->path->val[i], cert) == 0) + return 0; + } + if (q->match & HX509_QUERY_MATCH_FRIENDLY_NAME) { + const char *name = hx509_cert_get_friendly_name(cert); + if (name == NULL) + return 0; + if (strcasecmp(q->friendlyname, name) != 0) + return 0; + } + if (q->match & HX509_QUERY_MATCH_FUNCTION) { + ret = (*q->cmp_func)(context, cert, q->cmp_func_ctx); + if (ret != 0) + return 0; + } + + if (q->match & HX509_QUERY_MATCH_KEY_HASH_SHA1) { + heim_octet_string os; + + os.data = c->tbsCertificate.subjectPublicKeyInfo.subjectPublicKey.data; + os.length = + c->tbsCertificate.subjectPublicKeyInfo.subjectPublicKey.length / 8; + + ret = _hx509_verify_signature(context, + NULL, + hx509_signature_sha1(), + &os, + q->keyhash_sha1); + if (ret != 0) + return 0; + } + + if (q->match & HX509_QUERY_MATCH_TIME) { + time_t t; + t = _hx509_Time2time_t(&c->tbsCertificate.validity.notBefore); + if (t > q->timenow) + return 0; + t = _hx509_Time2time_t(&c->tbsCertificate.validity.notAfter); + if (t < q->timenow) + return 0; + } + + /* If an EKU is required, check the cert for it. */ + if ((q->match & HX509_QUERY_MATCH_EKU) && + hx509_cert_check_eku(context, cert, q->eku, 0)) + return 0; + + if ((q->match & HX509_QUERY_MATCH_EXPR)) { + hx509_env env = NULL; + + ret = _hx509_cert_to_env(context, cert, &env); + if (ret) + return 0; + + ret = _hx509_expr_eval(context, env, q->expr); + hx509_env_free(&env); + if (ret == 0) + return 0; + } + + if (q->match & ~HX509_QUERY_MASK) + return 0; + + return 1; +} + +/** + * Set a statistic file for the query statistics. + * + * @param context A hx509 context. + * @param fn statistics file name + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_query_statistic_file(hx509_context context, const char *fn) +{ + if (context->querystat) + free(context->querystat); + context->querystat = strdup(fn); +} + +HX509_LIB_FUNCTION void HX509_LIB_CALL +_hx509_query_statistic(hx509_context context, int type, const hx509_query *q) +{ + FILE *f; + if (context->querystat == NULL) + return; + f = fopen(context->querystat, "a"); + if (f == NULL) + return; + rk_cloexec_file(f); + fprintf(f, "%d %d\n", type, q->match); + fclose(f); +} + +static const char *statname[] = { + "find issuer cert", + "match serialnumber", + "match issuer name", + "match subject name", + "match subject key id", + "match issuer id", + "private key", + "ku encipherment", + "ku digitalsignature", + "ku keycertsign", + "ku crlsign", + "ku nonrepudiation", + "ku keyagreement", + "ku dataencipherment", + "anchor", + "match certificate", + "match local key id", + "no match path", + "match friendly name", + "match function", + "match key hash sha1", + "match time" +}; + +struct stat_el { + unsigned long stats; + unsigned int index; +}; + + +static int +stat_sort(const void *a, const void *b) +{ + const struct stat_el *ae = a; + const struct stat_el *be = b; + return be->stats - ae->stats; +} + +/** + * Unparse the statistics file and print the result on a FILE descriptor. + * + * @param context A hx509 context. + * @param printtype tyep to print + * @param out the FILE to write the data on. + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_query_unparse_stats(hx509_context context, int printtype, FILE *out) +{ + rtbl_t t; + FILE *f; + int type, mask, num; + size_t i; + unsigned long multiqueries = 0, totalqueries = 0; + struct stat_el stats[32]; + + if (context->querystat == NULL) + return; + f = fopen(context->querystat, "r"); + if (f == NULL) { + fprintf(out, "No statistics file %s: %s.\n", + context->querystat, strerror(errno)); + return; + } + rk_cloexec_file(f); + + for (i = 0; i < sizeof(stats)/sizeof(stats[0]); i++) { + stats[i].index = i; + stats[i].stats = 0; + } + + while (fscanf(f, "%d %d\n", &type, &mask) == 2) { + if (type != printtype) + continue; + num = i = 0; + while (mask && i < sizeof(stats)/sizeof(stats[0])) { + if (mask & 1) { + stats[i].stats++; + num++; + } + mask = mask >>1 ; + i++; + } + if (num > 1) + multiqueries++; + totalqueries++; + } + fclose(f); + + qsort(stats, sizeof(stats)/sizeof(stats[0]), sizeof(stats[0]), stat_sort); + + t = rtbl_create(); + if (t == NULL) + errx(1, "out of memory"); + + rtbl_set_separator (t, " "); + + rtbl_add_column_by_id (t, 0, "Name", 0); + rtbl_add_column_by_id (t, 1, "Counter", 0); + + + for (i = 0; i < sizeof(stats)/sizeof(stats[0]); i++) { + char str[10]; + + if (stats[i].index < sizeof(statname)/sizeof(statname[0])) + rtbl_add_column_entry_by_id (t, 0, statname[stats[i].index]); + else { + snprintf(str, sizeof(str), "%d", stats[i].index); + rtbl_add_column_entry_by_id (t, 0, str); + } + snprintf(str, sizeof(str), "%lu", stats[i].stats); + rtbl_add_column_entry_by_id (t, 1, str); + } + + rtbl_format(t, out); + rtbl_destroy(t); + + fprintf(out, "\nQueries: multi %lu total %lu\n", + multiqueries, totalqueries); +} + +/** + * Check the extended key usage on the hx509 certificate. + * + * @param context A hx509 context. + * @param cert A hx509 context. + * @param eku the EKU to check for + * @param allow_any_eku if the any EKU is set, allow that to be a + * substitute. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_check_eku(hx509_context context, hx509_cert cert, + const heim_oid *eku, int allow_any_eku) +{ + ExtKeyUsage e; + int ret; + size_t i; + + ret = find_extension_eku(_hx509_get_cert(cert), &e); + if (ret) { + hx509_clear_error_string(context); + return ret; + } + + for (i = 0; i < e.len; i++) { + if (der_heim_oid_cmp(eku, &e.val[i]) == 0) { + free_ExtKeyUsage(&e); + return 0; + } + if (allow_any_eku) { + if (der_heim_oid_cmp(&asn1_oid_id_x509_ce_anyExtendedKeyUsage, + &e.val[i]) == 0) { + free_ExtKeyUsage(&e); + return 0; + } + } + } + free_ExtKeyUsage(&e); + hx509_clear_error_string(context); + return HX509_CERTIFICATE_MISSING_EKU; +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_cert_get_keyusage(hx509_context context, + hx509_cert c, + KeyUsage *ku) +{ + Certificate *cert; + const Extension *e; + size_t size; + int ret; + size_t i = 0; + + memset(ku, 0, sizeof(*ku)); + + cert = _hx509_get_cert(c); + + if (_hx509_cert_get_version(cert) < 3) + return 0; + + e = find_extension(cert, &asn1_oid_id_x509_ce_keyUsage, &i); + if (e == NULL) + return HX509_KU_CERT_MISSING; + + ret = decode_KeyUsage(e->extnValue.data, e->extnValue.length, ku, &size); + if (ret) + return ret; + return 0; +} + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_cert_get_eku(hx509_context context, + hx509_cert cert, + ExtKeyUsage *e) +{ + int ret; + + memset(e, 0, sizeof(*e)); + + ret = find_extension_eku(_hx509_get_cert(cert), e); + if (ret && ret != HX509_EXTENSION_NOT_FOUND) { + hx509_clear_error_string(context); + return ret; + } + return 0; +} + +/** + * Encodes the hx509 certificate as a DER encode binary. + * + * @param context A hx509 context. + * @param c the certificate to encode. + * @param os the encode certificate, set to NULL, 0 on case of + * error. Free the os->data with hx509_xfree(). + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_cert_binary(hx509_context context, hx509_cert c, heim_octet_string *os) +{ + size_t size; + int ret; + + os->data = NULL; + os->length = 0; + + ASN1_MALLOC_ENCODE(Certificate, os->data, os->length, + _hx509_get_cert(c), &size, ret); + if (ret) { + os->data = NULL; + os->length = 0; + return ret; + } + if (os->length != size) + _hx509_abort("internal ASN.1 encoder error"); + return ret; +} + +/* + * Last to avoid lost __attribute__s due to #undef. + */ + +#undef __attribute__ +#define __attribute__(X) + +HX509_LIB_NORETURN_FUNCTION void HX509_LIB_CALL +_hx509_abort(const char *fmt, ...) + __attribute__ ((__noreturn__, __format__ (__printf__, 1, 2))) +{ + va_list ap; + va_start(ap, fmt); + vprintf(fmt, ap); + va_end(ap); + printf("\n"); + fflush(stdout); + abort(); +} + +/** + * Free a data element allocated in the library. + * + * @param ptr data to be freed. + * + * @ingroup hx509_misc + */ + +HX509_LIB_FUNCTION void HX509_LIB_CALL +hx509_xfree(void *ptr) +{ + free(ptr); +} + +/** + * + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +_hx509_cert_to_env(hx509_context context, hx509_cert cert, hx509_env *env) +{ + ExtKeyUsage eku; + hx509_name name; + char *buf; + int ret; + hx509_env envcert = NULL; + + *env = NULL; + + /* version */ + ret = asprintf(&buf, "%d", _hx509_cert_get_version(_hx509_get_cert(cert))); + if (ret == -1) + goto out; + ret = hx509_env_add(context, &envcert, "version", buf); + free(buf); + if (ret) + goto out; + + /* subject */ + ret = hx509_cert_get_subject(cert, &name); + if (ret) + goto out; + + ret = hx509_name_to_string(name, &buf); + hx509_name_free(&name); + if (ret) + goto out; + + ret = hx509_env_add(context, &envcert, "subject", buf); + hx509_xfree(buf); + if (ret) + goto out; + + /* issuer */ + ret = hx509_cert_get_issuer(cert, &name); + if (ret) + goto out; + + ret = hx509_name_to_string(name, &buf); + hx509_name_free(&name); + if (ret) + goto out; + + ret = hx509_env_add(context, &envcert, "issuer", buf); + hx509_xfree(buf); + if (ret) + goto out; + + /* eku */ + + ret = _hx509_cert_get_eku(context, cert, &eku); + if (ret == HX509_EXTENSION_NOT_FOUND) + ; + else if (ret != 0) + goto out; + else { + size_t i; + hx509_env enveku = NULL; + + for (i = 0; i < eku.len; i++) { + + ret = der_print_heim_oid(&eku.val[i], '.', &buf); + if (ret) { + free_ExtKeyUsage(&eku); + hx509_env_free(&enveku); + goto out; + } + ret = hx509_env_add(context, &enveku, buf, "oid-name-here"); + free(buf); + if (ret) { + free_ExtKeyUsage(&eku); + hx509_env_free(&enveku); + goto out; + } + } + free_ExtKeyUsage(&eku); + + ret = hx509_env_add_binding(context, &envcert, "eku", enveku); + if (ret) { + hx509_env_free(&enveku); + goto out; + } + } + + { + Certificate *c = _hx509_get_cert(cert); + heim_octet_string os, sig; + hx509_env envhash = NULL; + + os.data = c->tbsCertificate.subjectPublicKeyInfo.subjectPublicKey.data; + os.length = + c->tbsCertificate.subjectPublicKeyInfo.subjectPublicKey.length / 8; + + ret = _hx509_create_signature(context, + NULL, + hx509_signature_sha1(), + &os, + NULL, + &sig); + if (ret != 0) + goto out; + + ret = hex_encode(sig.data, sig.length, &buf); + der_free_octet_string(&sig); + if (ret < 0) { + ret = ENOMEM; + hx509_set_error_string(context, 0, ret, + "Out of memory"); + goto out; + } + + ret = hx509_env_add(context, &envhash, "sha1", buf); + free(buf); + if (ret) + goto out; + + ret = hx509_env_add_binding(context, &envcert, "hash", envhash); + if (ret) { + hx509_env_free(&envhash); + goto out; + } + } + + ret = hx509_env_add_binding(context, env, "certificate", envcert); + if (ret) + goto out; + + return 0; + +out: + hx509_env_free(&envcert); + return ret; +} + +/** + * Print a simple representation of a certificate + * + * @param context A hx509 context, can be NULL + * @param cert certificate to print + * @param out the stdio output stream, if NULL, stdout is used + * + * @return An hx509 error code + * + * @ingroup hx509_cert + */ + +HX509_LIB_FUNCTION int HX509_LIB_CALL +hx509_print_cert(hx509_context context, hx509_cert cert, FILE *out) +{ + hx509_name name; + char *str; + int ret; + + if (out == NULL) + out = stderr; + + ret = hx509_cert_get_issuer(cert, &name); + if (ret) + return ret; + hx509_name_to_string(name, &str); + hx509_name_free(&name); + fprintf(out, " issuer: \"%s\"\n", str); + free(str); + + ret = hx509_cert_get_subject(cert, &name); + if (ret) + return ret; + hx509_name_to_string(name, &str); + hx509_name_free(&name); + fprintf(out, " subject: \"%s\"\n", str); + free(str); + + { + heim_integer serialNumber; + + ret = hx509_cert_get_serialnumber(cert, &serialNumber); + if (ret) + return ret; + ret = der_print_hex_heim_integer(&serialNumber, &str); + if (ret) + return ret; + der_free_heim_integer(&serialNumber); + fprintf(out, " serial: %s\n", str); + free(str); + } + + fprintf(out, " keyusage: "); + ret = hx509_cert_keyusage_print(context, cert, &str); + if (ret == 0) { + fprintf(out, "%s\n", str); + free(str); + } else + fprintf(out, "no"); + + return 0; +} |