1*0Sstevel@tonic-gate /* v3_purp.c */ 2*0Sstevel@tonic-gate /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL 3*0Sstevel@tonic-gate * project 2001. 4*0Sstevel@tonic-gate */ 5*0Sstevel@tonic-gate /* ==================================================================== 6*0Sstevel@tonic-gate * Copyright (c) 1999-2004 The OpenSSL Project. All rights reserved. 7*0Sstevel@tonic-gate * 8*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 9*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 10*0Sstevel@tonic-gate * are met: 11*0Sstevel@tonic-gate * 12*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright 13*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 14*0Sstevel@tonic-gate * 15*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 16*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in 17*0Sstevel@tonic-gate * the documentation and/or other materials provided with the 18*0Sstevel@tonic-gate * distribution. 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this 21*0Sstevel@tonic-gate * software must display the following acknowledgment: 22*0Sstevel@tonic-gate * "This product includes software developed by the OpenSSL Project 23*0Sstevel@tonic-gate * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24*0Sstevel@tonic-gate * 25*0Sstevel@tonic-gate * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26*0Sstevel@tonic-gate * endorse or promote products derived from this software without 27*0Sstevel@tonic-gate * prior written permission. For written permission, please contact 28*0Sstevel@tonic-gate * licensing@OpenSSL.org. 29*0Sstevel@tonic-gate * 30*0Sstevel@tonic-gate * 5. Products derived from this software may not be called "OpenSSL" 31*0Sstevel@tonic-gate * nor may "OpenSSL" appear in their names without prior written 32*0Sstevel@tonic-gate * permission of the OpenSSL Project. 33*0Sstevel@tonic-gate * 34*0Sstevel@tonic-gate * 6. Redistributions of any form whatsoever must retain the following 35*0Sstevel@tonic-gate * acknowledgment: 36*0Sstevel@tonic-gate * "This product includes software developed by the OpenSSL Project 37*0Sstevel@tonic-gate * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38*0Sstevel@tonic-gate * 39*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40*0Sstevel@tonic-gate * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42*0Sstevel@tonic-gate * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43*0Sstevel@tonic-gate * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44*0Sstevel@tonic-gate * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45*0Sstevel@tonic-gate * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46*0Sstevel@tonic-gate * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48*0Sstevel@tonic-gate * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49*0Sstevel@tonic-gate * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50*0Sstevel@tonic-gate * OF THE POSSIBILITY OF SUCH DAMAGE. 51*0Sstevel@tonic-gate * ==================================================================== 52*0Sstevel@tonic-gate * 53*0Sstevel@tonic-gate * This product includes cryptographic software written by Eric Young 54*0Sstevel@tonic-gate * (eay@cryptsoft.com). This product includes software written by Tim 55*0Sstevel@tonic-gate * Hudson (tjh@cryptsoft.com). 56*0Sstevel@tonic-gate * 57*0Sstevel@tonic-gate */ 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate #include <stdio.h> 60*0Sstevel@tonic-gate #include "cryptlib.h" 61*0Sstevel@tonic-gate #include <openssl/x509v3.h> 62*0Sstevel@tonic-gate #include <openssl/x509_vfy.h> 63*0Sstevel@tonic-gate 64*0Sstevel@tonic-gate static void x509v3_cache_extensions(X509 *x); 65*0Sstevel@tonic-gate 66*0Sstevel@tonic-gate static int ca_check(const X509 *x); 67*0Sstevel@tonic-gate static int check_ssl_ca(const X509 *x); 68*0Sstevel@tonic-gate static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, int ca); 69*0Sstevel@tonic-gate static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca); 70*0Sstevel@tonic-gate static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca); 71*0Sstevel@tonic-gate static int purpose_smime(const X509 *x, int ca); 72*0Sstevel@tonic-gate static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x, int ca); 73*0Sstevel@tonic-gate static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x, int ca); 74*0Sstevel@tonic-gate static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x, int ca); 75*0Sstevel@tonic-gate static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca); 76*0Sstevel@tonic-gate static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca); 77*0Sstevel@tonic-gate 78*0Sstevel@tonic-gate static int xp_cmp(const X509_PURPOSE * const *a, 79*0Sstevel@tonic-gate const X509_PURPOSE * const *b); 80*0Sstevel@tonic-gate static void xptable_free(X509_PURPOSE *p); 81*0Sstevel@tonic-gate 82*0Sstevel@tonic-gate static X509_PURPOSE xstandard[] = { 83*0Sstevel@tonic-gate {X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0, check_purpose_ssl_client, "SSL client", "sslclient", NULL}, 84*0Sstevel@tonic-gate {X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ssl_server, "SSL server", "sslserver", NULL}, 85*0Sstevel@tonic-gate {X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL}, 86*0Sstevel@tonic-gate {X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign, "S/MIME signing", "smimesign", NULL}, 87*0Sstevel@tonic-gate {X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0, check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL}, 88*0Sstevel@tonic-gate {X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign, "CRL signing", "crlsign", NULL}, 89*0Sstevel@tonic-gate {X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, "Any Purpose", "any", NULL}, 90*0Sstevel@tonic-gate {X509_PURPOSE_OCSP_HELPER, X509_TRUST_COMPAT, 0, ocsp_helper, "OCSP helper", "ocsphelper", NULL}, 91*0Sstevel@tonic-gate }; 92*0Sstevel@tonic-gate 93*0Sstevel@tonic-gate #define X509_PURPOSE_COUNT (sizeof(xstandard)/sizeof(X509_PURPOSE)) 94*0Sstevel@tonic-gate 95*0Sstevel@tonic-gate IMPLEMENT_STACK_OF(X509_PURPOSE) 96*0Sstevel@tonic-gate 97*0Sstevel@tonic-gate static STACK_OF(X509_PURPOSE) *xptable = NULL; 98*0Sstevel@tonic-gate 99*0Sstevel@tonic-gate static int xp_cmp(const X509_PURPOSE * const *a, 100*0Sstevel@tonic-gate const X509_PURPOSE * const *b) 101*0Sstevel@tonic-gate { 102*0Sstevel@tonic-gate return (*a)->purpose - (*b)->purpose; 103*0Sstevel@tonic-gate } 104*0Sstevel@tonic-gate 105*0Sstevel@tonic-gate /* As much as I'd like to make X509_check_purpose use a "const" X509* 106*0Sstevel@tonic-gate * I really can't because it does recalculate hashes and do other non-const 107*0Sstevel@tonic-gate * things. */ 108*0Sstevel@tonic-gate int X509_check_purpose(X509 *x, int id, int ca) 109*0Sstevel@tonic-gate { 110*0Sstevel@tonic-gate int idx; 111*0Sstevel@tonic-gate const X509_PURPOSE *pt; 112*0Sstevel@tonic-gate if(!(x->ex_flags & EXFLAG_SET)) { 113*0Sstevel@tonic-gate CRYPTO_w_lock(CRYPTO_LOCK_X509); 114*0Sstevel@tonic-gate x509v3_cache_extensions(x); 115*0Sstevel@tonic-gate CRYPTO_w_unlock(CRYPTO_LOCK_X509); 116*0Sstevel@tonic-gate } 117*0Sstevel@tonic-gate if(id == -1) return 1; 118*0Sstevel@tonic-gate idx = X509_PURPOSE_get_by_id(id); 119*0Sstevel@tonic-gate if(idx == -1) return -1; 120*0Sstevel@tonic-gate pt = X509_PURPOSE_get0(idx); 121*0Sstevel@tonic-gate return pt->check_purpose(pt, x, ca); 122*0Sstevel@tonic-gate } 123*0Sstevel@tonic-gate 124*0Sstevel@tonic-gate int X509_PURPOSE_set(int *p, int purpose) 125*0Sstevel@tonic-gate { 126*0Sstevel@tonic-gate if(X509_PURPOSE_get_by_id(purpose) == -1) { 127*0Sstevel@tonic-gate X509V3err(X509V3_F_X509_PURPOSE_SET, X509V3_R_INVALID_PURPOSE); 128*0Sstevel@tonic-gate return 0; 129*0Sstevel@tonic-gate } 130*0Sstevel@tonic-gate *p = purpose; 131*0Sstevel@tonic-gate return 1; 132*0Sstevel@tonic-gate } 133*0Sstevel@tonic-gate 134*0Sstevel@tonic-gate int X509_PURPOSE_get_count(void) 135*0Sstevel@tonic-gate { 136*0Sstevel@tonic-gate if(!xptable) return X509_PURPOSE_COUNT; 137*0Sstevel@tonic-gate return sk_X509_PURPOSE_num(xptable) + X509_PURPOSE_COUNT; 138*0Sstevel@tonic-gate } 139*0Sstevel@tonic-gate 140*0Sstevel@tonic-gate X509_PURPOSE * X509_PURPOSE_get0(int idx) 141*0Sstevel@tonic-gate { 142*0Sstevel@tonic-gate if(idx < 0) return NULL; 143*0Sstevel@tonic-gate if(idx < X509_PURPOSE_COUNT) return xstandard + idx; 144*0Sstevel@tonic-gate return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT); 145*0Sstevel@tonic-gate } 146*0Sstevel@tonic-gate 147*0Sstevel@tonic-gate int X509_PURPOSE_get_by_sname(char *sname) 148*0Sstevel@tonic-gate { 149*0Sstevel@tonic-gate int i; 150*0Sstevel@tonic-gate X509_PURPOSE *xptmp; 151*0Sstevel@tonic-gate for(i = 0; i < X509_PURPOSE_get_count(); i++) { 152*0Sstevel@tonic-gate xptmp = X509_PURPOSE_get0(i); 153*0Sstevel@tonic-gate if(!strcmp(xptmp->sname, sname)) return i; 154*0Sstevel@tonic-gate } 155*0Sstevel@tonic-gate return -1; 156*0Sstevel@tonic-gate } 157*0Sstevel@tonic-gate 158*0Sstevel@tonic-gate int X509_PURPOSE_get_by_id(int purpose) 159*0Sstevel@tonic-gate { 160*0Sstevel@tonic-gate X509_PURPOSE tmp; 161*0Sstevel@tonic-gate int idx; 162*0Sstevel@tonic-gate if((purpose >= X509_PURPOSE_MIN) && (purpose <= X509_PURPOSE_MAX)) 163*0Sstevel@tonic-gate return purpose - X509_PURPOSE_MIN; 164*0Sstevel@tonic-gate tmp.purpose = purpose; 165*0Sstevel@tonic-gate if(!xptable) return -1; 166*0Sstevel@tonic-gate idx = sk_X509_PURPOSE_find(xptable, &tmp); 167*0Sstevel@tonic-gate if(idx == -1) return -1; 168*0Sstevel@tonic-gate return idx + X509_PURPOSE_COUNT; 169*0Sstevel@tonic-gate } 170*0Sstevel@tonic-gate 171*0Sstevel@tonic-gate int X509_PURPOSE_add(int id, int trust, int flags, 172*0Sstevel@tonic-gate int (*ck)(const X509_PURPOSE *, const X509 *, int), 173*0Sstevel@tonic-gate char *name, char *sname, void *arg) 174*0Sstevel@tonic-gate { 175*0Sstevel@tonic-gate int idx; 176*0Sstevel@tonic-gate X509_PURPOSE *ptmp; 177*0Sstevel@tonic-gate /* This is set according to what we change: application can't set it */ 178*0Sstevel@tonic-gate flags &= ~X509_PURPOSE_DYNAMIC; 179*0Sstevel@tonic-gate /* This will always be set for application modified trust entries */ 180*0Sstevel@tonic-gate flags |= X509_PURPOSE_DYNAMIC_NAME; 181*0Sstevel@tonic-gate /* Get existing entry if any */ 182*0Sstevel@tonic-gate idx = X509_PURPOSE_get_by_id(id); 183*0Sstevel@tonic-gate /* Need a new entry */ 184*0Sstevel@tonic-gate if(idx == -1) { 185*0Sstevel@tonic-gate if(!(ptmp = OPENSSL_malloc(sizeof(X509_PURPOSE)))) { 186*0Sstevel@tonic-gate X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE); 187*0Sstevel@tonic-gate return 0; 188*0Sstevel@tonic-gate } 189*0Sstevel@tonic-gate ptmp->flags = X509_PURPOSE_DYNAMIC; 190*0Sstevel@tonic-gate } else ptmp = X509_PURPOSE_get0(idx); 191*0Sstevel@tonic-gate 192*0Sstevel@tonic-gate /* OPENSSL_free existing name if dynamic */ 193*0Sstevel@tonic-gate if(ptmp->flags & X509_PURPOSE_DYNAMIC_NAME) { 194*0Sstevel@tonic-gate OPENSSL_free(ptmp->name); 195*0Sstevel@tonic-gate OPENSSL_free(ptmp->sname); 196*0Sstevel@tonic-gate } 197*0Sstevel@tonic-gate /* dup supplied name */ 198*0Sstevel@tonic-gate ptmp->name = BUF_strdup(name); 199*0Sstevel@tonic-gate ptmp->sname = BUF_strdup(sname); 200*0Sstevel@tonic-gate if(!ptmp->name || !ptmp->sname) { 201*0Sstevel@tonic-gate X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE); 202*0Sstevel@tonic-gate return 0; 203*0Sstevel@tonic-gate } 204*0Sstevel@tonic-gate /* Keep the dynamic flag of existing entry */ 205*0Sstevel@tonic-gate ptmp->flags &= X509_PURPOSE_DYNAMIC; 206*0Sstevel@tonic-gate /* Set all other flags */ 207*0Sstevel@tonic-gate ptmp->flags |= flags; 208*0Sstevel@tonic-gate 209*0Sstevel@tonic-gate ptmp->purpose = id; 210*0Sstevel@tonic-gate ptmp->trust = trust; 211*0Sstevel@tonic-gate ptmp->check_purpose = ck; 212*0Sstevel@tonic-gate ptmp->usr_data = arg; 213*0Sstevel@tonic-gate 214*0Sstevel@tonic-gate /* If its a new entry manage the dynamic table */ 215*0Sstevel@tonic-gate if(idx == -1) { 216*0Sstevel@tonic-gate if(!xptable && !(xptable = sk_X509_PURPOSE_new(xp_cmp))) { 217*0Sstevel@tonic-gate X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE); 218*0Sstevel@tonic-gate return 0; 219*0Sstevel@tonic-gate } 220*0Sstevel@tonic-gate if (!sk_X509_PURPOSE_push(xptable, ptmp)) { 221*0Sstevel@tonic-gate X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE); 222*0Sstevel@tonic-gate return 0; 223*0Sstevel@tonic-gate } 224*0Sstevel@tonic-gate } 225*0Sstevel@tonic-gate return 1; 226*0Sstevel@tonic-gate } 227*0Sstevel@tonic-gate 228*0Sstevel@tonic-gate static void xptable_free(X509_PURPOSE *p) 229*0Sstevel@tonic-gate { 230*0Sstevel@tonic-gate if(!p) return; 231*0Sstevel@tonic-gate if (p->flags & X509_PURPOSE_DYNAMIC) 232*0Sstevel@tonic-gate { 233*0Sstevel@tonic-gate if (p->flags & X509_PURPOSE_DYNAMIC_NAME) { 234*0Sstevel@tonic-gate OPENSSL_free(p->name); 235*0Sstevel@tonic-gate OPENSSL_free(p->sname); 236*0Sstevel@tonic-gate } 237*0Sstevel@tonic-gate OPENSSL_free(p); 238*0Sstevel@tonic-gate } 239*0Sstevel@tonic-gate } 240*0Sstevel@tonic-gate 241*0Sstevel@tonic-gate void X509_PURPOSE_cleanup(void) 242*0Sstevel@tonic-gate { 243*0Sstevel@tonic-gate int i; 244*0Sstevel@tonic-gate sk_X509_PURPOSE_pop_free(xptable, xptable_free); 245*0Sstevel@tonic-gate for(i = 0; i < X509_PURPOSE_COUNT; i++) xptable_free(xstandard + i); 246*0Sstevel@tonic-gate xptable = NULL; 247*0Sstevel@tonic-gate } 248*0Sstevel@tonic-gate 249*0Sstevel@tonic-gate int X509_PURPOSE_get_id(X509_PURPOSE *xp) 250*0Sstevel@tonic-gate { 251*0Sstevel@tonic-gate return xp->purpose; 252*0Sstevel@tonic-gate } 253*0Sstevel@tonic-gate 254*0Sstevel@tonic-gate char *X509_PURPOSE_get0_name(X509_PURPOSE *xp) 255*0Sstevel@tonic-gate { 256*0Sstevel@tonic-gate return xp->name; 257*0Sstevel@tonic-gate } 258*0Sstevel@tonic-gate 259*0Sstevel@tonic-gate char *X509_PURPOSE_get0_sname(X509_PURPOSE *xp) 260*0Sstevel@tonic-gate { 261*0Sstevel@tonic-gate return xp->sname; 262*0Sstevel@tonic-gate } 263*0Sstevel@tonic-gate 264*0Sstevel@tonic-gate int X509_PURPOSE_get_trust(X509_PURPOSE *xp) 265*0Sstevel@tonic-gate { 266*0Sstevel@tonic-gate return xp->trust; 267*0Sstevel@tonic-gate } 268*0Sstevel@tonic-gate 269*0Sstevel@tonic-gate static int nid_cmp(int *a, int *b) 270*0Sstevel@tonic-gate { 271*0Sstevel@tonic-gate return *a - *b; 272*0Sstevel@tonic-gate } 273*0Sstevel@tonic-gate 274*0Sstevel@tonic-gate int X509_supported_extension(X509_EXTENSION *ex) 275*0Sstevel@tonic-gate { 276*0Sstevel@tonic-gate /* This table is a list of the NIDs of supported extensions: 277*0Sstevel@tonic-gate * that is those which are used by the verify process. If 278*0Sstevel@tonic-gate * an extension is critical and doesn't appear in this list 279*0Sstevel@tonic-gate * then the verify process will normally reject the certificate. 280*0Sstevel@tonic-gate * The list must be kept in numerical order because it will be 281*0Sstevel@tonic-gate * searched using bsearch. 282*0Sstevel@tonic-gate */ 283*0Sstevel@tonic-gate 284*0Sstevel@tonic-gate static int supported_nids[] = { 285*0Sstevel@tonic-gate NID_netscape_cert_type, /* 71 */ 286*0Sstevel@tonic-gate NID_key_usage, /* 83 */ 287*0Sstevel@tonic-gate NID_subject_alt_name, /* 85 */ 288*0Sstevel@tonic-gate NID_basic_constraints, /* 87 */ 289*0Sstevel@tonic-gate NID_ext_key_usage /* 126 */ 290*0Sstevel@tonic-gate }; 291*0Sstevel@tonic-gate 292*0Sstevel@tonic-gate int ex_nid; 293*0Sstevel@tonic-gate 294*0Sstevel@tonic-gate ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex)); 295*0Sstevel@tonic-gate 296*0Sstevel@tonic-gate if (ex_nid == NID_undef) 297*0Sstevel@tonic-gate return 0; 298*0Sstevel@tonic-gate 299*0Sstevel@tonic-gate if (OBJ_bsearch((char *)&ex_nid, (char *)supported_nids, 300*0Sstevel@tonic-gate sizeof(supported_nids)/sizeof(int), sizeof(int), 301*0Sstevel@tonic-gate (int (*)(const void *, const void *))nid_cmp)) 302*0Sstevel@tonic-gate return 1; 303*0Sstevel@tonic-gate return 0; 304*0Sstevel@tonic-gate } 305*0Sstevel@tonic-gate 306*0Sstevel@tonic-gate 307*0Sstevel@tonic-gate static void x509v3_cache_extensions(X509 *x) 308*0Sstevel@tonic-gate { 309*0Sstevel@tonic-gate BASIC_CONSTRAINTS *bs; 310*0Sstevel@tonic-gate ASN1_BIT_STRING *usage; 311*0Sstevel@tonic-gate ASN1_BIT_STRING *ns; 312*0Sstevel@tonic-gate EXTENDED_KEY_USAGE *extusage; 313*0Sstevel@tonic-gate X509_EXTENSION *ex; 314*0Sstevel@tonic-gate 315*0Sstevel@tonic-gate int i; 316*0Sstevel@tonic-gate if(x->ex_flags & EXFLAG_SET) return; 317*0Sstevel@tonic-gate #ifndef OPENSSL_NO_SHA 318*0Sstevel@tonic-gate X509_digest(x, EVP_sha1(), x->sha1_hash, NULL); 319*0Sstevel@tonic-gate #endif 320*0Sstevel@tonic-gate /* Does subject name match issuer ? */ 321*0Sstevel@tonic-gate if(!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x))) 322*0Sstevel@tonic-gate x->ex_flags |= EXFLAG_SS; 323*0Sstevel@tonic-gate /* V1 should mean no extensions ... */ 324*0Sstevel@tonic-gate if(!X509_get_version(x)) x->ex_flags |= EXFLAG_V1; 325*0Sstevel@tonic-gate /* Handle basic constraints */ 326*0Sstevel@tonic-gate if((bs=X509_get_ext_d2i(x, NID_basic_constraints, NULL, NULL))) { 327*0Sstevel@tonic-gate if(bs->ca) x->ex_flags |= EXFLAG_CA; 328*0Sstevel@tonic-gate if(bs->pathlen) { 329*0Sstevel@tonic-gate if((bs->pathlen->type == V_ASN1_NEG_INTEGER) 330*0Sstevel@tonic-gate || !bs->ca) { 331*0Sstevel@tonic-gate x->ex_flags |= EXFLAG_INVALID; 332*0Sstevel@tonic-gate x->ex_pathlen = 0; 333*0Sstevel@tonic-gate } else x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen); 334*0Sstevel@tonic-gate } else x->ex_pathlen = -1; 335*0Sstevel@tonic-gate BASIC_CONSTRAINTS_free(bs); 336*0Sstevel@tonic-gate x->ex_flags |= EXFLAG_BCONS; 337*0Sstevel@tonic-gate } 338*0Sstevel@tonic-gate /* Handle key usage */ 339*0Sstevel@tonic-gate if((usage=X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) { 340*0Sstevel@tonic-gate if(usage->length > 0) { 341*0Sstevel@tonic-gate x->ex_kusage = usage->data[0]; 342*0Sstevel@tonic-gate if(usage->length > 1) 343*0Sstevel@tonic-gate x->ex_kusage |= usage->data[1] << 8; 344*0Sstevel@tonic-gate } else x->ex_kusage = 0; 345*0Sstevel@tonic-gate x->ex_flags |= EXFLAG_KUSAGE; 346*0Sstevel@tonic-gate ASN1_BIT_STRING_free(usage); 347*0Sstevel@tonic-gate } 348*0Sstevel@tonic-gate x->ex_xkusage = 0; 349*0Sstevel@tonic-gate if((extusage=X509_get_ext_d2i(x, NID_ext_key_usage, NULL, NULL))) { 350*0Sstevel@tonic-gate x->ex_flags |= EXFLAG_XKUSAGE; 351*0Sstevel@tonic-gate for(i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) { 352*0Sstevel@tonic-gate switch(OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage,i))) { 353*0Sstevel@tonic-gate case NID_server_auth: 354*0Sstevel@tonic-gate x->ex_xkusage |= XKU_SSL_SERVER; 355*0Sstevel@tonic-gate break; 356*0Sstevel@tonic-gate 357*0Sstevel@tonic-gate case NID_client_auth: 358*0Sstevel@tonic-gate x->ex_xkusage |= XKU_SSL_CLIENT; 359*0Sstevel@tonic-gate break; 360*0Sstevel@tonic-gate 361*0Sstevel@tonic-gate case NID_email_protect: 362*0Sstevel@tonic-gate x->ex_xkusage |= XKU_SMIME; 363*0Sstevel@tonic-gate break; 364*0Sstevel@tonic-gate 365*0Sstevel@tonic-gate case NID_code_sign: 366*0Sstevel@tonic-gate x->ex_xkusage |= XKU_CODE_SIGN; 367*0Sstevel@tonic-gate break; 368*0Sstevel@tonic-gate 369*0Sstevel@tonic-gate case NID_ms_sgc: 370*0Sstevel@tonic-gate case NID_ns_sgc: 371*0Sstevel@tonic-gate x->ex_xkusage |= XKU_SGC; 372*0Sstevel@tonic-gate break; 373*0Sstevel@tonic-gate 374*0Sstevel@tonic-gate case NID_OCSP_sign: 375*0Sstevel@tonic-gate x->ex_xkusage |= XKU_OCSP_SIGN; 376*0Sstevel@tonic-gate break; 377*0Sstevel@tonic-gate 378*0Sstevel@tonic-gate case NID_time_stamp: 379*0Sstevel@tonic-gate x->ex_xkusage |= XKU_TIMESTAMP; 380*0Sstevel@tonic-gate break; 381*0Sstevel@tonic-gate 382*0Sstevel@tonic-gate case NID_dvcs: 383*0Sstevel@tonic-gate x->ex_xkusage |= XKU_DVCS; 384*0Sstevel@tonic-gate break; 385*0Sstevel@tonic-gate } 386*0Sstevel@tonic-gate } 387*0Sstevel@tonic-gate sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free); 388*0Sstevel@tonic-gate } 389*0Sstevel@tonic-gate 390*0Sstevel@tonic-gate if((ns=X509_get_ext_d2i(x, NID_netscape_cert_type, NULL, NULL))) { 391*0Sstevel@tonic-gate if(ns->length > 0) x->ex_nscert = ns->data[0]; 392*0Sstevel@tonic-gate else x->ex_nscert = 0; 393*0Sstevel@tonic-gate x->ex_flags |= EXFLAG_NSCERT; 394*0Sstevel@tonic-gate ASN1_BIT_STRING_free(ns); 395*0Sstevel@tonic-gate } 396*0Sstevel@tonic-gate x->skid =X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL); 397*0Sstevel@tonic-gate x->akid =X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL); 398*0Sstevel@tonic-gate for (i = 0; i < X509_get_ext_count(x); i++) 399*0Sstevel@tonic-gate { 400*0Sstevel@tonic-gate ex = X509_get_ext(x, i); 401*0Sstevel@tonic-gate if (!X509_EXTENSION_get_critical(ex)) 402*0Sstevel@tonic-gate continue; 403*0Sstevel@tonic-gate if (!X509_supported_extension(ex)) 404*0Sstevel@tonic-gate { 405*0Sstevel@tonic-gate x->ex_flags |= EXFLAG_CRITICAL; 406*0Sstevel@tonic-gate break; 407*0Sstevel@tonic-gate } 408*0Sstevel@tonic-gate } 409*0Sstevel@tonic-gate x->ex_flags |= EXFLAG_SET; 410*0Sstevel@tonic-gate } 411*0Sstevel@tonic-gate 412*0Sstevel@tonic-gate /* CA checks common to all purposes 413*0Sstevel@tonic-gate * return codes: 414*0Sstevel@tonic-gate * 0 not a CA 415*0Sstevel@tonic-gate * 1 is a CA 416*0Sstevel@tonic-gate * 2 basicConstraints absent so "maybe" a CA 417*0Sstevel@tonic-gate * 3 basicConstraints absent but self signed V1. 418*0Sstevel@tonic-gate * 4 basicConstraints absent but keyUsage present and keyCertSign asserted. 419*0Sstevel@tonic-gate */ 420*0Sstevel@tonic-gate 421*0Sstevel@tonic-gate #define V1_ROOT (EXFLAG_V1|EXFLAG_SS) 422*0Sstevel@tonic-gate #define ku_reject(x, usage) \ 423*0Sstevel@tonic-gate (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage))) 424*0Sstevel@tonic-gate #define xku_reject(x, usage) \ 425*0Sstevel@tonic-gate (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage))) 426*0Sstevel@tonic-gate #define ns_reject(x, usage) \ 427*0Sstevel@tonic-gate (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage))) 428*0Sstevel@tonic-gate 429*0Sstevel@tonic-gate static int ca_check(const X509 *x) 430*0Sstevel@tonic-gate { 431*0Sstevel@tonic-gate /* keyUsage if present should allow cert signing */ 432*0Sstevel@tonic-gate if(ku_reject(x, KU_KEY_CERT_SIGN)) return 0; 433*0Sstevel@tonic-gate if(x->ex_flags & EXFLAG_BCONS) { 434*0Sstevel@tonic-gate if(x->ex_flags & EXFLAG_CA) return 1; 435*0Sstevel@tonic-gate /* If basicConstraints says not a CA then say so */ 436*0Sstevel@tonic-gate else return 0; 437*0Sstevel@tonic-gate } else { 438*0Sstevel@tonic-gate if((x->ex_flags & V1_ROOT) == V1_ROOT) return 3; 439*0Sstevel@tonic-gate /* If key usage present it must have certSign so tolerate it */ 440*0Sstevel@tonic-gate else if (x->ex_flags & EXFLAG_KUSAGE) return 4; 441*0Sstevel@tonic-gate else return 2; 442*0Sstevel@tonic-gate } 443*0Sstevel@tonic-gate } 444*0Sstevel@tonic-gate 445*0Sstevel@tonic-gate /* Check SSL CA: common checks for SSL client and server */ 446*0Sstevel@tonic-gate static int check_ssl_ca(const X509 *x) 447*0Sstevel@tonic-gate { 448*0Sstevel@tonic-gate int ca_ret; 449*0Sstevel@tonic-gate ca_ret = ca_check(x); 450*0Sstevel@tonic-gate if(!ca_ret) return 0; 451*0Sstevel@tonic-gate /* check nsCertType if present */ 452*0Sstevel@tonic-gate if(x->ex_flags & EXFLAG_NSCERT) { 453*0Sstevel@tonic-gate if(x->ex_nscert & NS_SSL_CA) return ca_ret; 454*0Sstevel@tonic-gate return 0; 455*0Sstevel@tonic-gate } 456*0Sstevel@tonic-gate if(ca_ret != 2) return ca_ret; 457*0Sstevel@tonic-gate else return 0; 458*0Sstevel@tonic-gate } 459*0Sstevel@tonic-gate 460*0Sstevel@tonic-gate 461*0Sstevel@tonic-gate static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, int ca) 462*0Sstevel@tonic-gate { 463*0Sstevel@tonic-gate if(xku_reject(x,XKU_SSL_CLIENT)) return 0; 464*0Sstevel@tonic-gate if(ca) return check_ssl_ca(x); 465*0Sstevel@tonic-gate /* We need to do digital signatures with it */ 466*0Sstevel@tonic-gate if(ku_reject(x,KU_DIGITAL_SIGNATURE)) return 0; 467*0Sstevel@tonic-gate /* nsCertType if present should allow SSL client use */ 468*0Sstevel@tonic-gate if(ns_reject(x, NS_SSL_CLIENT)) return 0; 469*0Sstevel@tonic-gate return 1; 470*0Sstevel@tonic-gate } 471*0Sstevel@tonic-gate 472*0Sstevel@tonic-gate static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca) 473*0Sstevel@tonic-gate { 474*0Sstevel@tonic-gate if(xku_reject(x,XKU_SSL_SERVER|XKU_SGC)) return 0; 475*0Sstevel@tonic-gate if(ca) return check_ssl_ca(x); 476*0Sstevel@tonic-gate 477*0Sstevel@tonic-gate if(ns_reject(x, NS_SSL_SERVER)) return 0; 478*0Sstevel@tonic-gate /* Now as for keyUsage: we'll at least need to sign OR encipher */ 479*0Sstevel@tonic-gate if(ku_reject(x, KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT)) return 0; 480*0Sstevel@tonic-gate 481*0Sstevel@tonic-gate return 1; 482*0Sstevel@tonic-gate 483*0Sstevel@tonic-gate } 484*0Sstevel@tonic-gate 485*0Sstevel@tonic-gate static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca) 486*0Sstevel@tonic-gate { 487*0Sstevel@tonic-gate int ret; 488*0Sstevel@tonic-gate ret = check_purpose_ssl_server(xp, x, ca); 489*0Sstevel@tonic-gate if(!ret || ca) return ret; 490*0Sstevel@tonic-gate /* We need to encipher or Netscape complains */ 491*0Sstevel@tonic-gate if(ku_reject(x, KU_KEY_ENCIPHERMENT)) return 0; 492*0Sstevel@tonic-gate return ret; 493*0Sstevel@tonic-gate } 494*0Sstevel@tonic-gate 495*0Sstevel@tonic-gate /* common S/MIME checks */ 496*0Sstevel@tonic-gate static int purpose_smime(const X509 *x, int ca) 497*0Sstevel@tonic-gate { 498*0Sstevel@tonic-gate if(xku_reject(x,XKU_SMIME)) return 0; 499*0Sstevel@tonic-gate if(ca) { 500*0Sstevel@tonic-gate int ca_ret; 501*0Sstevel@tonic-gate ca_ret = ca_check(x); 502*0Sstevel@tonic-gate if(!ca_ret) return 0; 503*0Sstevel@tonic-gate /* check nsCertType if present */ 504*0Sstevel@tonic-gate if(x->ex_flags & EXFLAG_NSCERT) { 505*0Sstevel@tonic-gate if(x->ex_nscert & NS_SMIME_CA) return ca_ret; 506*0Sstevel@tonic-gate return 0; 507*0Sstevel@tonic-gate } 508*0Sstevel@tonic-gate if(ca_ret != 2) return ca_ret; 509*0Sstevel@tonic-gate else return 0; 510*0Sstevel@tonic-gate } 511*0Sstevel@tonic-gate if(x->ex_flags & EXFLAG_NSCERT) { 512*0Sstevel@tonic-gate if(x->ex_nscert & NS_SMIME) return 1; 513*0Sstevel@tonic-gate /* Workaround for some buggy certificates */ 514*0Sstevel@tonic-gate if(x->ex_nscert & NS_SSL_CLIENT) return 2; 515*0Sstevel@tonic-gate return 0; 516*0Sstevel@tonic-gate } 517*0Sstevel@tonic-gate return 1; 518*0Sstevel@tonic-gate } 519*0Sstevel@tonic-gate 520*0Sstevel@tonic-gate static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x, int ca) 521*0Sstevel@tonic-gate { 522*0Sstevel@tonic-gate int ret; 523*0Sstevel@tonic-gate ret = purpose_smime(x, ca); 524*0Sstevel@tonic-gate if(!ret || ca) return ret; 525*0Sstevel@tonic-gate if(ku_reject(x, KU_DIGITAL_SIGNATURE|KU_NON_REPUDIATION)) return 0; 526*0Sstevel@tonic-gate return ret; 527*0Sstevel@tonic-gate } 528*0Sstevel@tonic-gate 529*0Sstevel@tonic-gate static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x, int ca) 530*0Sstevel@tonic-gate { 531*0Sstevel@tonic-gate int ret; 532*0Sstevel@tonic-gate ret = purpose_smime(x, ca); 533*0Sstevel@tonic-gate if(!ret || ca) return ret; 534*0Sstevel@tonic-gate if(ku_reject(x, KU_KEY_ENCIPHERMENT)) return 0; 535*0Sstevel@tonic-gate return ret; 536*0Sstevel@tonic-gate } 537*0Sstevel@tonic-gate 538*0Sstevel@tonic-gate static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x, int ca) 539*0Sstevel@tonic-gate { 540*0Sstevel@tonic-gate if(ca) { 541*0Sstevel@tonic-gate int ca_ret; 542*0Sstevel@tonic-gate if((ca_ret = ca_check(x)) != 2) return ca_ret; 543*0Sstevel@tonic-gate else return 0; 544*0Sstevel@tonic-gate } 545*0Sstevel@tonic-gate if(ku_reject(x, KU_CRL_SIGN)) return 0; 546*0Sstevel@tonic-gate return 1; 547*0Sstevel@tonic-gate } 548*0Sstevel@tonic-gate 549*0Sstevel@tonic-gate /* OCSP helper: this is *not* a full OCSP check. It just checks that 550*0Sstevel@tonic-gate * each CA is valid. Additional checks must be made on the chain. 551*0Sstevel@tonic-gate */ 552*0Sstevel@tonic-gate 553*0Sstevel@tonic-gate static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca) 554*0Sstevel@tonic-gate { 555*0Sstevel@tonic-gate /* Must be a valid CA */ 556*0Sstevel@tonic-gate if(ca) { 557*0Sstevel@tonic-gate int ca_ret; 558*0Sstevel@tonic-gate ca_ret = ca_check(x); 559*0Sstevel@tonic-gate if(ca_ret != 2) return ca_ret; 560*0Sstevel@tonic-gate if(x->ex_flags & EXFLAG_NSCERT) { 561*0Sstevel@tonic-gate if(x->ex_nscert & NS_ANY_CA) return ca_ret; 562*0Sstevel@tonic-gate return 0; 563*0Sstevel@tonic-gate } 564*0Sstevel@tonic-gate return 0; 565*0Sstevel@tonic-gate } 566*0Sstevel@tonic-gate /* leaf certificate is checked in OCSP_verify() */ 567*0Sstevel@tonic-gate return 1; 568*0Sstevel@tonic-gate } 569*0Sstevel@tonic-gate 570*0Sstevel@tonic-gate static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca) 571*0Sstevel@tonic-gate { 572*0Sstevel@tonic-gate return 1; 573*0Sstevel@tonic-gate } 574*0Sstevel@tonic-gate 575*0Sstevel@tonic-gate /* Various checks to see if one certificate issued the second. 576*0Sstevel@tonic-gate * This can be used to prune a set of possible issuer certificates 577*0Sstevel@tonic-gate * which have been looked up using some simple method such as by 578*0Sstevel@tonic-gate * subject name. 579*0Sstevel@tonic-gate * These are: 580*0Sstevel@tonic-gate * 1. Check issuer_name(subject) == subject_name(issuer) 581*0Sstevel@tonic-gate * 2. If akid(subject) exists check it matches issuer 582*0Sstevel@tonic-gate * 3. If key_usage(issuer) exists check it supports certificate signing 583*0Sstevel@tonic-gate * returns 0 for OK, positive for reason for mismatch, reasons match 584*0Sstevel@tonic-gate * codes for X509_verify_cert() 585*0Sstevel@tonic-gate */ 586*0Sstevel@tonic-gate 587*0Sstevel@tonic-gate int X509_check_issued(X509 *issuer, X509 *subject) 588*0Sstevel@tonic-gate { 589*0Sstevel@tonic-gate if(X509_NAME_cmp(X509_get_subject_name(issuer), 590*0Sstevel@tonic-gate X509_get_issuer_name(subject))) 591*0Sstevel@tonic-gate return X509_V_ERR_SUBJECT_ISSUER_MISMATCH; 592*0Sstevel@tonic-gate x509v3_cache_extensions(issuer); 593*0Sstevel@tonic-gate x509v3_cache_extensions(subject); 594*0Sstevel@tonic-gate if(subject->akid) { 595*0Sstevel@tonic-gate /* Check key ids (if present) */ 596*0Sstevel@tonic-gate if(subject->akid->keyid && issuer->skid && 597*0Sstevel@tonic-gate ASN1_OCTET_STRING_cmp(subject->akid->keyid, issuer->skid) ) 598*0Sstevel@tonic-gate return X509_V_ERR_AKID_SKID_MISMATCH; 599*0Sstevel@tonic-gate /* Check serial number */ 600*0Sstevel@tonic-gate if(subject->akid->serial && 601*0Sstevel@tonic-gate ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), 602*0Sstevel@tonic-gate subject->akid->serial)) 603*0Sstevel@tonic-gate return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH; 604*0Sstevel@tonic-gate /* Check issuer name */ 605*0Sstevel@tonic-gate if(subject->akid->issuer) { 606*0Sstevel@tonic-gate /* Ugh, for some peculiar reason AKID includes 607*0Sstevel@tonic-gate * SEQUENCE OF GeneralName. So look for a DirName. 608*0Sstevel@tonic-gate * There may be more than one but we only take any 609*0Sstevel@tonic-gate * notice of the first. 610*0Sstevel@tonic-gate */ 611*0Sstevel@tonic-gate GENERAL_NAMES *gens; 612*0Sstevel@tonic-gate GENERAL_NAME *gen; 613*0Sstevel@tonic-gate X509_NAME *nm = NULL; 614*0Sstevel@tonic-gate int i; 615*0Sstevel@tonic-gate gens = subject->akid->issuer; 616*0Sstevel@tonic-gate for(i = 0; i < sk_GENERAL_NAME_num(gens); i++) { 617*0Sstevel@tonic-gate gen = sk_GENERAL_NAME_value(gens, i); 618*0Sstevel@tonic-gate if(gen->type == GEN_DIRNAME) { 619*0Sstevel@tonic-gate nm = gen->d.dirn; 620*0Sstevel@tonic-gate break; 621*0Sstevel@tonic-gate } 622*0Sstevel@tonic-gate } 623*0Sstevel@tonic-gate if(nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer))) 624*0Sstevel@tonic-gate return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH; 625*0Sstevel@tonic-gate } 626*0Sstevel@tonic-gate } 627*0Sstevel@tonic-gate if(ku_reject(issuer, KU_KEY_CERT_SIGN)) return X509_V_ERR_KEYUSAGE_NO_CERTSIGN; 628*0Sstevel@tonic-gate return X509_V_OK; 629*0Sstevel@tonic-gate } 630*0Sstevel@tonic-gate 631