159191Skris/* v3_purp.c */ 2280297Sjkim/* 3280297Sjkim * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project 4280297Sjkim * 2001. 559191Skris */ 659191Skris/* ==================================================================== 7337982Sjkim * Copyright (c) 1999-2018 The OpenSSL Project. All rights reserved. 859191Skris * 959191Skris * Redistribution and use in source and binary forms, with or without 1059191Skris * modification, are permitted provided that the following conditions 1159191Skris * are met: 1259191Skris * 1359191Skris * 1. Redistributions of source code must retain the above copyright 14280297Sjkim * notice, this list of conditions and the following disclaimer. 1559191Skris * 1659191Skris * 2. Redistributions in binary form must reproduce the above copyright 1759191Skris * notice, this list of conditions and the following disclaimer in 1859191Skris * the documentation and/or other materials provided with the 1959191Skris * distribution. 2059191Skris * 2159191Skris * 3. All advertising materials mentioning features or use of this 2259191Skris * software must display the following acknowledgment: 2359191Skris * "This product includes software developed by the OpenSSL Project 2459191Skris * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 2559191Skris * 2659191Skris * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 2759191Skris * endorse or promote products derived from this software without 2859191Skris * prior written permission. For written permission, please contact 2959191Skris * licensing@OpenSSL.org. 3059191Skris * 3159191Skris * 5. Products derived from this software may not be called "OpenSSL" 3259191Skris * nor may "OpenSSL" appear in their names without prior written 3359191Skris * permission of the OpenSSL Project. 3459191Skris * 3559191Skris * 6. Redistributions of any form whatsoever must retain the following 3659191Skris * acknowledgment: 3759191Skris * "This product includes software developed by the OpenSSL Project 3859191Skris * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 3959191Skris * 4059191Skris * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 4159191Skris * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4259191Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 4359191Skris * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 4459191Skris * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 4559191Skris * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 4659191Skris * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 4759191Skris * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4859191Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 4959191Skris * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 5059191Skris * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 5159191Skris * OF THE POSSIBILITY OF SUCH DAMAGE. 5259191Skris * ==================================================================== 5359191Skris * 5459191Skris * This product includes cryptographic software written by Eric Young 5559191Skris * (eay@cryptsoft.com). This product includes software written by Tim 5659191Skris * Hudson (tjh@cryptsoft.com). 5759191Skris * 5859191Skris */ 5959191Skris 6059191Skris#include <stdio.h> 6159191Skris#include "cryptlib.h" 6259191Skris#include <openssl/x509v3.h> 6368651Skris#include <openssl/x509_vfy.h> 6459191Skris 6559191Skrisstatic void x509v3_cache_extensions(X509 *x); 6659191Skris 6768651Skrisstatic int check_ssl_ca(const X509 *x); 68280297Sjkimstatic int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, 69280297Sjkim int ca); 70280297Sjkimstatic int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, 71280297Sjkim int ca); 72280297Sjkimstatic int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x, 73280297Sjkim int ca); 7468651Skrisstatic int purpose_smime(const X509 *x, int ca); 75280297Sjkimstatic int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x, 76280297Sjkim int ca); 77280297Sjkimstatic int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x, 78280297Sjkim int ca); 79280297Sjkimstatic int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x, 80280297Sjkim int ca); 81280297Sjkimstatic int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x, 82280297Sjkim int ca); 8368651Skrisstatic int no_check(const X509_PURPOSE *xp, const X509 *x, int ca); 84109998Smarkmstatic int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca); 8559191Skris 86280297Sjkimstatic int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b); 8759191Skrisstatic void xptable_free(X509_PURPOSE *p); 8859191Skris 8959191Skrisstatic X509_PURPOSE xstandard[] = { 90280297Sjkim {X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0, 91280297Sjkim check_purpose_ssl_client, "SSL client", "sslclient", NULL}, 92280297Sjkim {X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, 93280297Sjkim check_purpose_ssl_server, "SSL server", "sslserver", NULL}, 94280297Sjkim {X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, 95280297Sjkim check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL}, 96280297Sjkim {X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign, 97280297Sjkim "S/MIME signing", "smimesign", NULL}, 98280297Sjkim {X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0, 99280297Sjkim check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL}, 100280297Sjkim {X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign, 101280297Sjkim "CRL signing", "crlsign", NULL}, 102280297Sjkim {X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, "Any Purpose", "any", 103280297Sjkim NULL}, 104280297Sjkim {X509_PURPOSE_OCSP_HELPER, X509_TRUST_COMPAT, 0, ocsp_helper, 105280297Sjkim "OCSP helper", "ocsphelper", NULL}, 106280297Sjkim {X509_PURPOSE_TIMESTAMP_SIGN, X509_TRUST_TSA, 0, 107280297Sjkim check_purpose_timestamp_sign, "Time Stamp signing", "timestampsign", 108280297Sjkim NULL}, 10959191Skris}; 11059191Skris 11159191Skris#define X509_PURPOSE_COUNT (sizeof(xstandard)/sizeof(X509_PURPOSE)) 11259191Skris 11359191SkrisIMPLEMENT_STACK_OF(X509_PURPOSE) 11459191Skris 11559191Skrisstatic STACK_OF(X509_PURPOSE) *xptable = NULL; 11659191Skris 117280297Sjkimstatic int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b) 11859191Skris{ 119280297Sjkim return (*a)->purpose - (*b)->purpose; 12059191Skris} 12159191Skris 122280297Sjkim/* 123280297Sjkim * As much as I'd like to make X509_check_purpose use a "const" X509* I 124280297Sjkim * really can't because it does recalculate hashes and do other non-const 125280297Sjkim * things. 126280297Sjkim */ 12759191Skrisint X509_check_purpose(X509 *x, int id, int ca) 12859191Skris{ 129280297Sjkim int idx; 130280297Sjkim const X509_PURPOSE *pt; 131337982Sjkim 132337982Sjkim x509v3_cache_extensions(x); 133337982Sjkim 134337982Sjkim /* Return if side-effect only call */ 135280297Sjkim if (id == -1) 136280297Sjkim return 1; 137280297Sjkim idx = X509_PURPOSE_get_by_id(id); 138280297Sjkim if (idx == -1) 139280297Sjkim return -1; 140280297Sjkim pt = X509_PURPOSE_get0(idx); 141280297Sjkim return pt->check_purpose(pt, x, ca); 14259191Skris} 14359191Skris 144109998Smarkmint X509_PURPOSE_set(int *p, int purpose) 145109998Smarkm{ 146280297Sjkim if (X509_PURPOSE_get_by_id(purpose) == -1) { 147280297Sjkim X509V3err(X509V3_F_X509_PURPOSE_SET, X509V3_R_INVALID_PURPOSE); 148280297Sjkim return 0; 149280297Sjkim } 150280297Sjkim *p = purpose; 151280297Sjkim return 1; 152109998Smarkm} 153109998Smarkm 15459191Skrisint X509_PURPOSE_get_count(void) 15559191Skris{ 156280297Sjkim if (!xptable) 157280297Sjkim return X509_PURPOSE_COUNT; 158280297Sjkim return sk_X509_PURPOSE_num(xptable) + X509_PURPOSE_COUNT; 15959191Skris} 16059191Skris 161280297SjkimX509_PURPOSE *X509_PURPOSE_get0(int idx) 16259191Skris{ 163280297Sjkim if (idx < 0) 164280297Sjkim return NULL; 165280297Sjkim if (idx < (int)X509_PURPOSE_COUNT) 166280297Sjkim return xstandard + idx; 167280297Sjkim return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT); 16859191Skris} 16959191Skris 17059191Skrisint X509_PURPOSE_get_by_sname(char *sname) 17159191Skris{ 172280297Sjkim int i; 173280297Sjkim X509_PURPOSE *xptmp; 174280297Sjkim for (i = 0; i < X509_PURPOSE_get_count(); i++) { 175280297Sjkim xptmp = X509_PURPOSE_get0(i); 176280297Sjkim if (!strcmp(xptmp->sname, sname)) 177280297Sjkim return i; 178280297Sjkim } 179280297Sjkim return -1; 18059191Skris} 18159191Skris 18259191Skrisint X509_PURPOSE_get_by_id(int purpose) 18359191Skris{ 184280297Sjkim X509_PURPOSE tmp; 185280297Sjkim int idx; 186280297Sjkim if ((purpose >= X509_PURPOSE_MIN) && (purpose <= X509_PURPOSE_MAX)) 187280297Sjkim return purpose - X509_PURPOSE_MIN; 188280297Sjkim tmp.purpose = purpose; 189280297Sjkim if (!xptable) 190280297Sjkim return -1; 191280297Sjkim idx = sk_X509_PURPOSE_find(xptable, &tmp); 192280297Sjkim if (idx == -1) 193280297Sjkim return -1; 194280297Sjkim return idx + X509_PURPOSE_COUNT; 19559191Skris} 19659191Skris 19759191Skrisint X509_PURPOSE_add(int id, int trust, int flags, 198280297Sjkim int (*ck) (const X509_PURPOSE *, const X509 *, int), 199280297Sjkim char *name, char *sname, void *arg) 20059191Skris{ 201280297Sjkim int idx; 202280297Sjkim X509_PURPOSE *ptmp; 203280297Sjkim /* 204280297Sjkim * This is set according to what we change: application can't set it 205280297Sjkim */ 206280297Sjkim flags &= ~X509_PURPOSE_DYNAMIC; 207280297Sjkim /* This will always be set for application modified trust entries */ 208280297Sjkim flags |= X509_PURPOSE_DYNAMIC_NAME; 209280297Sjkim /* Get existing entry if any */ 210280297Sjkim idx = X509_PURPOSE_get_by_id(id); 211280297Sjkim /* Need a new entry */ 212280297Sjkim if (idx == -1) { 213280297Sjkim if (!(ptmp = OPENSSL_malloc(sizeof(X509_PURPOSE)))) { 214280297Sjkim X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE); 215280297Sjkim return 0; 216280297Sjkim } 217280297Sjkim ptmp->flags = X509_PURPOSE_DYNAMIC; 218280297Sjkim } else 219280297Sjkim ptmp = X509_PURPOSE_get0(idx); 22059191Skris 221280297Sjkim /* OPENSSL_free existing name if dynamic */ 222280297Sjkim if (ptmp->flags & X509_PURPOSE_DYNAMIC_NAME) { 223280297Sjkim OPENSSL_free(ptmp->name); 224280297Sjkim OPENSSL_free(ptmp->sname); 225280297Sjkim } 226280297Sjkim /* dup supplied name */ 227280297Sjkim ptmp->name = BUF_strdup(name); 228280297Sjkim ptmp->sname = BUF_strdup(sname); 229280297Sjkim if (!ptmp->name || !ptmp->sname) { 230280297Sjkim X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE); 231280297Sjkim return 0; 232280297Sjkim } 233280297Sjkim /* Keep the dynamic flag of existing entry */ 234280297Sjkim ptmp->flags &= X509_PURPOSE_DYNAMIC; 235280297Sjkim /* Set all other flags */ 236280297Sjkim ptmp->flags |= flags; 23759191Skris 238280297Sjkim ptmp->purpose = id; 239280297Sjkim ptmp->trust = trust; 240280297Sjkim ptmp->check_purpose = ck; 241280297Sjkim ptmp->usr_data = arg; 24259191Skris 243280297Sjkim /* If its a new entry manage the dynamic table */ 244280297Sjkim if (idx == -1) { 245280297Sjkim if (!xptable && !(xptable = sk_X509_PURPOSE_new(xp_cmp))) { 246280297Sjkim X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE); 247280297Sjkim return 0; 248280297Sjkim } 249280297Sjkim if (!sk_X509_PURPOSE_push(xptable, ptmp)) { 250280297Sjkim X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE); 251280297Sjkim return 0; 252280297Sjkim } 253280297Sjkim } 254280297Sjkim return 1; 25559191Skris} 25659191Skris 25759191Skrisstatic void xptable_free(X509_PURPOSE *p) 258280297Sjkim{ 259280297Sjkim if (!p) 260280297Sjkim return; 261280297Sjkim if (p->flags & X509_PURPOSE_DYNAMIC) { 262280297Sjkim if (p->flags & X509_PURPOSE_DYNAMIC_NAME) { 263280297Sjkim OPENSSL_free(p->name); 264280297Sjkim OPENSSL_free(p->sname); 265280297Sjkim } 266280297Sjkim OPENSSL_free(p); 267280297Sjkim } 268280297Sjkim} 26959191Skris 27059191Skrisvoid X509_PURPOSE_cleanup(void) 27159191Skris{ 272280297Sjkim unsigned int i; 273280297Sjkim sk_X509_PURPOSE_pop_free(xptable, xptable_free); 274280297Sjkim for (i = 0; i < X509_PURPOSE_COUNT; i++) 275280297Sjkim xptable_free(xstandard + i); 276280297Sjkim xptable = NULL; 27759191Skris} 27859191Skris 27959191Skrisint X509_PURPOSE_get_id(X509_PURPOSE *xp) 28059191Skris{ 281280297Sjkim return xp->purpose; 28259191Skris} 28359191Skris 28459191Skrischar *X509_PURPOSE_get0_name(X509_PURPOSE *xp) 28559191Skris{ 286280297Sjkim return xp->name; 28759191Skris} 28859191Skris 28959191Skrischar *X509_PURPOSE_get0_sname(X509_PURPOSE *xp) 29059191Skris{ 291280297Sjkim return xp->sname; 29259191Skris} 29359191Skris 29459191Skrisint X509_PURPOSE_get_trust(X509_PURPOSE *xp) 29559191Skris{ 296280297Sjkim return xp->trust; 29759191Skris} 29859191Skris 299238405Sjkimstatic int nid_cmp(const int *a, const int *b) 300280297Sjkim{ 301280297Sjkim return *a - *b; 302280297Sjkim} 303109998Smarkm 304238405SjkimDECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid); 305238405SjkimIMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid); 306238405Sjkim 307109998Smarkmint X509_supported_extension(X509_EXTENSION *ex) 308280297Sjkim{ 309280297Sjkim /* 310280297Sjkim * This table is a list of the NIDs of supported extensions: that is 311280297Sjkim * those which are used by the verify process. If an extension is 312280297Sjkim * critical and doesn't appear in this list then the verify process will 313280297Sjkim * normally reject the certificate. The list must be kept in numerical 314280297Sjkim * order because it will be searched using bsearch. 315280297Sjkim */ 316109998Smarkm 317280297Sjkim static const int supported_nids[] = { 318280297Sjkim NID_netscape_cert_type, /* 71 */ 319280297Sjkim NID_key_usage, /* 83 */ 320280297Sjkim NID_subject_alt_name, /* 85 */ 321280297Sjkim NID_basic_constraints, /* 87 */ 322280297Sjkim NID_certificate_policies, /* 89 */ 323325335Sjkim NID_crl_distribution_points, /* 103 */ 324280297Sjkim NID_ext_key_usage, /* 126 */ 325167612Ssimon#ifndef OPENSSL_NO_RFC3779 326280297Sjkim NID_sbgp_ipAddrBlock, /* 290 */ 327280297Sjkim NID_sbgp_autonomousSysNum, /* 291 */ 328167612Ssimon#endif 329280297Sjkim NID_policy_constraints, /* 401 */ 330280297Sjkim NID_proxyCertInfo, /* 663 */ 331280297Sjkim NID_name_constraints, /* 666 */ 332280297Sjkim NID_policy_mappings, /* 747 */ 333280297Sjkim NID_inhibit_any_policy /* 748 */ 334280297Sjkim }; 335109998Smarkm 336280297Sjkim int ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex)); 337109998Smarkm 338280297Sjkim if (ex_nid == NID_undef) 339280297Sjkim return 0; 340109998Smarkm 341280297Sjkim if (OBJ_bsearch_nid(&ex_nid, supported_nids, 342280297Sjkim sizeof(supported_nids) / sizeof(int))) 343280297Sjkim return 1; 344280297Sjkim return 0; 345280297Sjkim} 346109998Smarkm 347238405Sjkimstatic void setup_dp(X509 *x, DIST_POINT *dp) 348280297Sjkim{ 349280297Sjkim X509_NAME *iname = NULL; 350280297Sjkim int i; 351280297Sjkim if (dp->reasons) { 352280297Sjkim if (dp->reasons->length > 0) 353280297Sjkim dp->dp_reasons = dp->reasons->data[0]; 354280297Sjkim if (dp->reasons->length > 1) 355280297Sjkim dp->dp_reasons |= (dp->reasons->data[1] << 8); 356280297Sjkim dp->dp_reasons &= CRLDP_ALL_REASONS; 357280297Sjkim } else 358280297Sjkim dp->dp_reasons = CRLDP_ALL_REASONS; 359280297Sjkim if (!dp->distpoint || (dp->distpoint->type != 1)) 360280297Sjkim return; 361280297Sjkim for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) { 362280297Sjkim GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i); 363280297Sjkim if (gen->type == GEN_DIRNAME) { 364280297Sjkim iname = gen->d.directoryName; 365280297Sjkim break; 366280297Sjkim } 367280297Sjkim } 368280297Sjkim if (!iname) 369280297Sjkim iname = X509_get_issuer_name(x); 370238405Sjkim 371280297Sjkim DIST_POINT_set_dpname(dp->distpoint, iname); 372238405Sjkim 373280297Sjkim} 374238405Sjkim 375238405Sjkimstatic void setup_crldp(X509 *x) 376280297Sjkim{ 377280297Sjkim int i; 378280297Sjkim x->crldp = X509_get_ext_d2i(x, NID_crl_distribution_points, NULL, NULL); 379280297Sjkim for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++) 380280297Sjkim setup_dp(x, sk_DIST_POINT_value(x->crldp, i)); 381280297Sjkim} 382238405Sjkim 383291719Sjkim#define V1_ROOT (EXFLAG_V1|EXFLAG_SS) 384291719Sjkim#define ku_reject(x, usage) \ 385291719Sjkim (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage))) 386291719Sjkim#define xku_reject(x, usage) \ 387291719Sjkim (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage))) 388291719Sjkim#define ns_reject(x, usage) \ 389291719Sjkim (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage))) 390291719Sjkim 39159191Skrisstatic void x509v3_cache_extensions(X509 *x) 39259191Skris{ 393280297Sjkim BASIC_CONSTRAINTS *bs; 394280297Sjkim PROXY_CERT_INFO_EXTENSION *pci; 395280297Sjkim ASN1_BIT_STRING *usage; 396280297Sjkim ASN1_BIT_STRING *ns; 397280297Sjkim EXTENDED_KEY_USAGE *extusage; 398280297Sjkim X509_EXTENSION *ex; 399280297Sjkim int i; 400337982Sjkim 401337982Sjkim CRYPTO_w_lock(CRYPTO_LOCK_X509); 402337982Sjkim if (x->ex_flags & EXFLAG_SET) { 403337982Sjkim CRYPTO_w_unlock(CRYPTO_LOCK_X509); 404337982Sjkim return; 405337982Sjkim } 406337982Sjkim 407109998Smarkm#ifndef OPENSSL_NO_SHA 408280297Sjkim X509_digest(x, EVP_sha1(), x->sha1_hash, NULL); 40968651Skris#endif 410280297Sjkim /* V1 should mean no extensions ... */ 411280297Sjkim if (!X509_get_version(x)) 412280297Sjkim x->ex_flags |= EXFLAG_V1; 413280297Sjkim /* Handle basic constraints */ 414280297Sjkim if ((bs = X509_get_ext_d2i(x, NID_basic_constraints, NULL, NULL))) { 415280297Sjkim if (bs->ca) 416280297Sjkim x->ex_flags |= EXFLAG_CA; 417280297Sjkim if (bs->pathlen) { 418280297Sjkim if ((bs->pathlen->type == V_ASN1_NEG_INTEGER) 419280297Sjkim || !bs->ca) { 420280297Sjkim x->ex_flags |= EXFLAG_INVALID; 421280297Sjkim x->ex_pathlen = 0; 422280297Sjkim } else 423280297Sjkim x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen); 424280297Sjkim } else 425280297Sjkim x->ex_pathlen = -1; 426280297Sjkim BASIC_CONSTRAINTS_free(bs); 427280297Sjkim x->ex_flags |= EXFLAG_BCONS; 428280297Sjkim } 429280297Sjkim /* Handle proxy certificates */ 430280297Sjkim if ((pci = X509_get_ext_d2i(x, NID_proxyCertInfo, NULL, NULL))) { 431280297Sjkim if (x->ex_flags & EXFLAG_CA 432280297Sjkim || X509_get_ext_by_NID(x, NID_subject_alt_name, -1) >= 0 433280297Sjkim || X509_get_ext_by_NID(x, NID_issuer_alt_name, -1) >= 0) { 434280297Sjkim x->ex_flags |= EXFLAG_INVALID; 435280297Sjkim } 436280297Sjkim if (pci->pcPathLengthConstraint) { 437280297Sjkim x->ex_pcpathlen = ASN1_INTEGER_get(pci->pcPathLengthConstraint); 438280297Sjkim } else 439280297Sjkim x->ex_pcpathlen = -1; 440280297Sjkim PROXY_CERT_INFO_EXTENSION_free(pci); 441280297Sjkim x->ex_flags |= EXFLAG_PROXY; 442280297Sjkim } 443280297Sjkim /* Handle key usage */ 444280297Sjkim if ((usage = X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) { 445280297Sjkim if (usage->length > 0) { 446280297Sjkim x->ex_kusage = usage->data[0]; 447280297Sjkim if (usage->length > 1) 448280297Sjkim x->ex_kusage |= usage->data[1] << 8; 449280297Sjkim } else 450280297Sjkim x->ex_kusage = 0; 451280297Sjkim x->ex_flags |= EXFLAG_KUSAGE; 452280297Sjkim ASN1_BIT_STRING_free(usage); 453280297Sjkim } 454280297Sjkim x->ex_xkusage = 0; 455280297Sjkim if ((extusage = X509_get_ext_d2i(x, NID_ext_key_usage, NULL, NULL))) { 456280297Sjkim x->ex_flags |= EXFLAG_XKUSAGE; 457280297Sjkim for (i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) { 458280297Sjkim switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage, i))) { 459280297Sjkim case NID_server_auth: 460280297Sjkim x->ex_xkusage |= XKU_SSL_SERVER; 461280297Sjkim break; 46259191Skris 463280297Sjkim case NID_client_auth: 464280297Sjkim x->ex_xkusage |= XKU_SSL_CLIENT; 465280297Sjkim break; 46659191Skris 467280297Sjkim case NID_email_protect: 468280297Sjkim x->ex_xkusage |= XKU_SMIME; 469280297Sjkim break; 47059191Skris 471280297Sjkim case NID_code_sign: 472280297Sjkim x->ex_xkusage |= XKU_CODE_SIGN; 473280297Sjkim break; 47459191Skris 475280297Sjkim case NID_ms_sgc: 476280297Sjkim case NID_ns_sgc: 477280297Sjkim x->ex_xkusage |= XKU_SGC; 478280297Sjkim break; 479109998Smarkm 480280297Sjkim case NID_OCSP_sign: 481280297Sjkim x->ex_xkusage |= XKU_OCSP_SIGN; 482280297Sjkim break; 483109998Smarkm 484280297Sjkim case NID_time_stamp: 485280297Sjkim x->ex_xkusage |= XKU_TIMESTAMP; 486280297Sjkim break; 487111147Snectar 488280297Sjkim case NID_dvcs: 489280297Sjkim x->ex_xkusage |= XKU_DVCS; 490280297Sjkim break; 491290207Sjkim 492290207Sjkim case NID_anyExtendedKeyUsage: 493290207Sjkim x->ex_xkusage |= XKU_ANYEKU; 494290207Sjkim break; 495280297Sjkim } 496280297Sjkim } 497280297Sjkim sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free); 498280297Sjkim } 49959191Skris 500280297Sjkim if ((ns = X509_get_ext_d2i(x, NID_netscape_cert_type, NULL, NULL))) { 501280297Sjkim if (ns->length > 0) 502280297Sjkim x->ex_nscert = ns->data[0]; 503280297Sjkim else 504280297Sjkim x->ex_nscert = 0; 505280297Sjkim x->ex_flags |= EXFLAG_NSCERT; 506280297Sjkim ASN1_BIT_STRING_free(ns); 507280297Sjkim } 508280297Sjkim x->skid = X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL); 509280297Sjkim x->akid = X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL); 510290207Sjkim /* Does subject name match issuer ? */ 511290207Sjkim if (!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x))) { 512290207Sjkim x->ex_flags |= EXFLAG_SI; 513290207Sjkim /* If SKID matches AKID also indicate self signed */ 514291719Sjkim if (X509_check_akid(x, x->akid) == X509_V_OK && 515291719Sjkim !ku_reject(x, KU_KEY_CERT_SIGN)) 516290207Sjkim x->ex_flags |= EXFLAG_SS; 517290207Sjkim } 518280297Sjkim x->altname = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL); 519280297Sjkim x->nc = X509_get_ext_d2i(x, NID_name_constraints, &i, NULL); 520280297Sjkim if (!x->nc && (i != -1)) 521280297Sjkim x->ex_flags |= EXFLAG_INVALID; 522280297Sjkim setup_crldp(x); 523238405Sjkim 524167612Ssimon#ifndef OPENSSL_NO_RFC3779 525280297Sjkim x->rfc3779_addr = X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL); 526280297Sjkim x->rfc3779_asid = X509_get_ext_d2i(x, NID_sbgp_autonomousSysNum, 527280297Sjkim NULL, NULL); 528167612Ssimon#endif 529280297Sjkim for (i = 0; i < X509_get_ext_count(x); i++) { 530280297Sjkim ex = X509_get_ext(x, i); 531280297Sjkim if (OBJ_obj2nid(X509_EXTENSION_get_object(ex)) 532280297Sjkim == NID_freshest_crl) 533280297Sjkim x->ex_flags |= EXFLAG_FRESHEST; 534280297Sjkim if (!X509_EXTENSION_get_critical(ex)) 535280297Sjkim continue; 536280297Sjkim if (!X509_supported_extension(ex)) { 537280297Sjkim x->ex_flags |= EXFLAG_CRITICAL; 538280297Sjkim break; 539280297Sjkim } 540280297Sjkim } 541280297Sjkim x->ex_flags |= EXFLAG_SET; 542337982Sjkim CRYPTO_w_unlock(CRYPTO_LOCK_X509); 54359191Skris} 54459191Skris 545280297Sjkim/*- 546280297Sjkim * CA checks common to all purposes 54759191Skris * return codes: 54859191Skris * 0 not a CA 54959191Skris * 1 is a CA 55059191Skris * 2 basicConstraints absent so "maybe" a CA 55159191Skris * 3 basicConstraints absent but self signed V1. 552127128Snectar * 4 basicConstraints absent but keyUsage present and keyCertSign asserted. 55359191Skris */ 55459191Skris 555160814Ssimonstatic int check_ca(const X509 *x) 55659191Skris{ 557280297Sjkim /* keyUsage if present should allow cert signing */ 558280297Sjkim if (ku_reject(x, KU_KEY_CERT_SIGN)) 559280297Sjkim return 0; 560280297Sjkim if (x->ex_flags & EXFLAG_BCONS) { 561280297Sjkim if (x->ex_flags & EXFLAG_CA) 562280297Sjkim return 1; 563280297Sjkim /* If basicConstraints says not a CA then say so */ 564280297Sjkim else 565280297Sjkim return 0; 566280297Sjkim } else { 567280297Sjkim /* we support V1 roots for... uh, I don't really know why. */ 568280297Sjkim if ((x->ex_flags & V1_ROOT) == V1_ROOT) 569280297Sjkim return 3; 570280297Sjkim /* 571280297Sjkim * If key usage present it must have certSign so tolerate it 572280297Sjkim */ 573280297Sjkim else if (x->ex_flags & EXFLAG_KUSAGE) 574280297Sjkim return 4; 575280297Sjkim /* Older certificates could have Netscape-specific CA types */ 576280297Sjkim else if (x->ex_flags & EXFLAG_NSCERT && x->ex_nscert & NS_ANY_CA) 577280297Sjkim return 5; 578280297Sjkim /* can this still be regarded a CA certificate? I doubt it */ 579280297Sjkim return 0; 580280297Sjkim } 58159191Skris} 58259191Skris 583160814Ssimonint X509_check_ca(X509 *x) 584160814Ssimon{ 585337982Sjkim x509v3_cache_extensions(x); 586160814Ssimon 587280297Sjkim return check_ca(x); 588160814Ssimon} 589160814Ssimon 59068651Skris/* Check SSL CA: common checks for SSL client and server */ 59168651Skrisstatic int check_ssl_ca(const X509 *x) 59268651Skris{ 593280297Sjkim int ca_ret; 594280297Sjkim ca_ret = check_ca(x); 595280297Sjkim if (!ca_ret) 596280297Sjkim return 0; 597280297Sjkim /* check nsCertType if present */ 598280297Sjkim if (ca_ret != 5 || x->ex_nscert & NS_SSL_CA) 599280297Sjkim return ca_ret; 600280297Sjkim else 601280297Sjkim return 0; 60268651Skris} 60359191Skris 604280297Sjkimstatic int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, 605280297Sjkim int ca) 60659191Skris{ 607280297Sjkim if (xku_reject(x, XKU_SSL_CLIENT)) 608280297Sjkim return 0; 609280297Sjkim if (ca) 610280297Sjkim return check_ssl_ca(x); 611290207Sjkim /* We need to do digital signatures or key agreement */ 612290207Sjkim if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_KEY_AGREEMENT)) 613280297Sjkim return 0; 614280297Sjkim /* nsCertType if present should allow SSL client use */ 615280297Sjkim if (ns_reject(x, NS_SSL_CLIENT)) 616280297Sjkim return 0; 617280297Sjkim return 1; 61859191Skris} 61959191Skris 620290207Sjkim/* 621290207Sjkim * Key usage needed for TLS/SSL server: digital signature, encipherment or 622290207Sjkim * key agreement. The ssl code can check this more thoroughly for individual 623290207Sjkim * key types. 624290207Sjkim */ 625290207Sjkim#define KU_TLS \ 626290207Sjkim KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT 627290207Sjkim 628280297Sjkimstatic int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, 629280297Sjkim int ca) 63059191Skris{ 631280297Sjkim if (xku_reject(x, XKU_SSL_SERVER | XKU_SGC)) 632280297Sjkim return 0; 633280297Sjkim if (ca) 634280297Sjkim return check_ssl_ca(x); 63559191Skris 636280297Sjkim if (ns_reject(x, NS_SSL_SERVER)) 637280297Sjkim return 0; 638290207Sjkim if (ku_reject(x, KU_TLS)) 639280297Sjkim return 0; 64059191Skris 641280297Sjkim return 1; 642280297Sjkim 64359191Skris} 64459191Skris 645280297Sjkimstatic int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x, 646280297Sjkim int ca) 64759191Skris{ 648280297Sjkim int ret; 649280297Sjkim ret = check_purpose_ssl_server(xp, x, ca); 650280297Sjkim if (!ret || ca) 651280297Sjkim return ret; 652280297Sjkim /* We need to encipher or Netscape complains */ 653280297Sjkim if (ku_reject(x, KU_KEY_ENCIPHERMENT)) 654280297Sjkim return 0; 655280297Sjkim return ret; 65659191Skris} 65759191Skris 65859191Skris/* common S/MIME checks */ 65968651Skrisstatic int purpose_smime(const X509 *x, int ca) 66059191Skris{ 661280297Sjkim if (xku_reject(x, XKU_SMIME)) 662280297Sjkim return 0; 663280297Sjkim if (ca) { 664280297Sjkim int ca_ret; 665280297Sjkim ca_ret = check_ca(x); 666280297Sjkim if (!ca_ret) 667280297Sjkim return 0; 668280297Sjkim /* check nsCertType if present */ 669280297Sjkim if (ca_ret != 5 || x->ex_nscert & NS_SMIME_CA) 670280297Sjkim return ca_ret; 671280297Sjkim else 672280297Sjkim return 0; 673280297Sjkim } 674280297Sjkim if (x->ex_flags & EXFLAG_NSCERT) { 675280297Sjkim if (x->ex_nscert & NS_SMIME) 676280297Sjkim return 1; 677280297Sjkim /* Workaround for some buggy certificates */ 678280297Sjkim if (x->ex_nscert & NS_SSL_CLIENT) 679280297Sjkim return 2; 680280297Sjkim return 0; 681280297Sjkim } 682280297Sjkim return 1; 68359191Skris} 68459191Skris 685280297Sjkimstatic int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x, 686280297Sjkim int ca) 68759191Skris{ 688280297Sjkim int ret; 689280297Sjkim ret = purpose_smime(x, ca); 690280297Sjkim if (!ret || ca) 691280297Sjkim return ret; 692280297Sjkim if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_NON_REPUDIATION)) 693280297Sjkim return 0; 694280297Sjkim return ret; 69559191Skris} 69659191Skris 697280297Sjkimstatic int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x, 698280297Sjkim int ca) 69959191Skris{ 700280297Sjkim int ret; 701280297Sjkim ret = purpose_smime(x, ca); 702280297Sjkim if (!ret || ca) 703280297Sjkim return ret; 704280297Sjkim if (ku_reject(x, KU_KEY_ENCIPHERMENT)) 705280297Sjkim return 0; 706280297Sjkim return ret; 70759191Skris} 70859191Skris 709280297Sjkimstatic int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x, 710280297Sjkim int ca) 71159191Skris{ 712280297Sjkim if (ca) { 713280297Sjkim int ca_ret; 714280297Sjkim if ((ca_ret = check_ca(x)) != 2) 715280297Sjkim return ca_ret; 716280297Sjkim else 717280297Sjkim return 0; 718280297Sjkim } 719280297Sjkim if (ku_reject(x, KU_CRL_SIGN)) 720280297Sjkim return 0; 721280297Sjkim return 1; 72259191Skris} 72359191Skris 724280297Sjkim/* 725280297Sjkim * OCSP helper: this is *not* a full OCSP check. It just checks that each CA 726280297Sjkim * is valid. Additional checks must be made on the chain. 727109998Smarkm */ 728109998Smarkm 729109998Smarkmstatic int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca) 730109998Smarkm{ 731280297Sjkim /* 732280297Sjkim * Must be a valid CA. Should we really support the "I don't know" value 733280297Sjkim * (2)? 734280297Sjkim */ 735280297Sjkim if (ca) 736280297Sjkim return check_ca(x); 737280297Sjkim /* leaf certificate is checked in OCSP_verify() */ 738280297Sjkim return 1; 739109998Smarkm} 740109998Smarkm 741238405Sjkimstatic int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x, 742280297Sjkim int ca) 743238405Sjkim{ 744280297Sjkim int i_ext; 745238405Sjkim 746280297Sjkim /* If ca is true we must return if this is a valid CA certificate. */ 747280297Sjkim if (ca) 748280297Sjkim return check_ca(x); 749238405Sjkim 750280297Sjkim /* 751280297Sjkim * Check the optional key usage field: 752280297Sjkim * if Key Usage is present, it must be one of digitalSignature 753280297Sjkim * and/or nonRepudiation (other values are not consistent and shall 754280297Sjkim * be rejected). 755280297Sjkim */ 756280297Sjkim if ((x->ex_flags & EXFLAG_KUSAGE) 757280297Sjkim && ((x->ex_kusage & ~(KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)) || 758280297Sjkim !(x->ex_kusage & (KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)))) 759280297Sjkim return 0; 760238405Sjkim 761280297Sjkim /* Only time stamp key usage is permitted and it's required. */ 762280297Sjkim if (!(x->ex_flags & EXFLAG_XKUSAGE) || x->ex_xkusage != XKU_TIMESTAMP) 763280297Sjkim return 0; 764238405Sjkim 765280297Sjkim /* Extended Key Usage MUST be critical */ 766280297Sjkim i_ext = X509_get_ext_by_NID((X509 *)x, NID_ext_key_usage, -1); 767280297Sjkim if (i_ext >= 0) { 768280297Sjkim X509_EXTENSION *ext = X509_get_ext((X509 *)x, i_ext); 769280297Sjkim if (!X509_EXTENSION_get_critical(ext)) 770280297Sjkim return 0; 771280297Sjkim } 772238405Sjkim 773280297Sjkim return 1; 774238405Sjkim} 775238405Sjkim 77668651Skrisstatic int no_check(const X509_PURPOSE *xp, const X509 *x, int ca) 77759191Skris{ 778280297Sjkim return 1; 77959191Skris} 78068651Skris 781280297Sjkim/*- 782280297Sjkim * Various checks to see if one certificate issued the second. 78368651Skris * This can be used to prune a set of possible issuer certificates 78468651Skris * which have been looked up using some simple method such as by 78568651Skris * subject name. 78668651Skris * These are: 78768651Skris * 1. Check issuer_name(subject) == subject_name(issuer) 78868651Skris * 2. If akid(subject) exists check it matches issuer 78968651Skris * 3. If key_usage(issuer) exists check it supports certificate signing 79068651Skris * returns 0 for OK, positive for reason for mismatch, reasons match 79168651Skris * codes for X509_verify_cert() 79268651Skris */ 79368651Skris 79468651Skrisint X509_check_issued(X509 *issuer, X509 *subject) 79568651Skris{ 796280297Sjkim if (X509_NAME_cmp(X509_get_subject_name(issuer), 797280297Sjkim X509_get_issuer_name(subject))) 798280297Sjkim return X509_V_ERR_SUBJECT_ISSUER_MISMATCH; 799337982Sjkim 800280297Sjkim x509v3_cache_extensions(issuer); 801280297Sjkim x509v3_cache_extensions(subject); 802238405Sjkim 803280297Sjkim if (subject->akid) { 804280297Sjkim int ret = X509_check_akid(issuer, subject->akid); 805280297Sjkim if (ret != X509_V_OK) 806280297Sjkim return ret; 807280297Sjkim } 808238405Sjkim 809280297Sjkim if (subject->ex_flags & EXFLAG_PROXY) { 810280297Sjkim if (ku_reject(issuer, KU_DIGITAL_SIGNATURE)) 811280297Sjkim return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE; 812280297Sjkim } else if (ku_reject(issuer, KU_KEY_CERT_SIGN)) 813280297Sjkim return X509_V_ERR_KEYUSAGE_NO_CERTSIGN; 814280297Sjkim return X509_V_OK; 81568651Skris} 81668651Skris 817238405Sjkimint X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid) 818280297Sjkim{ 819238405Sjkim 820280297Sjkim if (!akid) 821280297Sjkim return X509_V_OK; 822238405Sjkim 823280297Sjkim /* Check key ids (if present) */ 824280297Sjkim if (akid->keyid && issuer->skid && 825280297Sjkim ASN1_OCTET_STRING_cmp(akid->keyid, issuer->skid)) 826280297Sjkim return X509_V_ERR_AKID_SKID_MISMATCH; 827280297Sjkim /* Check serial number */ 828280297Sjkim if (akid->serial && 829280297Sjkim ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), akid->serial)) 830280297Sjkim return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH; 831280297Sjkim /* Check issuer name */ 832280297Sjkim if (akid->issuer) { 833280297Sjkim /* 834280297Sjkim * Ugh, for some peculiar reason AKID includes SEQUENCE OF 835280297Sjkim * GeneralName. So look for a DirName. There may be more than one but 836280297Sjkim * we only take any notice of the first. 837280297Sjkim */ 838280297Sjkim GENERAL_NAMES *gens; 839280297Sjkim GENERAL_NAME *gen; 840280297Sjkim X509_NAME *nm = NULL; 841280297Sjkim int i; 842280297Sjkim gens = akid->issuer; 843280297Sjkim for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) { 844280297Sjkim gen = sk_GENERAL_NAME_value(gens, i); 845280297Sjkim if (gen->type == GEN_DIRNAME) { 846280297Sjkim nm = gen->d.dirn; 847280297Sjkim break; 848280297Sjkim } 849280297Sjkim } 850280297Sjkim if (nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer))) 851280297Sjkim return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH; 852280297Sjkim } 853280297Sjkim return X509_V_OK; 854280297Sjkim} 855