X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=crypto%2Fx509v3%2Fv3_purp.c;h=4b986dfc5d6163158e6d5d8a42bb3e011d1e48e1;hb=057c8a2b9e24b91d4e98b38bf1c91f232f065637;hp=717e23d5c6e4cc39c9ddcdfbc2e2095a4ec9a19f;hpb=9d6b1ce6441c7cc6aed344f02d9f676ab5e04217;p=oweals%2Fopenssl.git diff --git a/crypto/x509v3/v3_purp.c b/crypto/x509v3/v3_purp.c index 717e23d5c6..4b986dfc5d 100644 --- a/crypto/x509v3/v3_purp.c +++ b/crypto/x509v3/v3_purp.c @@ -1,9 +1,9 @@ /* v3_purp.c */ -/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL - * project 1999. +/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL + * project 2001. */ /* ==================================================================== - * Copyright (c) 1999 The OpenSSL Project. All rights reserved. + * Copyright (c) 1999-2004 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -61,10 +61,8 @@ #include #include - static void x509v3_cache_extensions(X509 *x); -static int ca_check(const X509 *x); static int check_ssl_ca(const X509 *x); static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, int ca); static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca); @@ -73,7 +71,9 @@ static int purpose_smime(const X509 *x, int ca); static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x, int ca); static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x, int ca); static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x, int ca); +static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x, int ca); static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca); +static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca); static int xp_cmp(const X509_PURPOSE * const *a, const X509_PURPOSE * const *b); @@ -87,6 +87,8 @@ static X509_PURPOSE xstandard[] = { {X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0, check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL}, {X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign, "CRL signing", "crlsign", NULL}, {X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, "Any Purpose", "any", NULL}, + {X509_PURPOSE_OCSP_HELPER, X509_TRUST_COMPAT, 0, ocsp_helper, "OCSP helper", "ocsphelper", NULL}, + {X509_PURPOSE_TIMESTAMP_SIGN, X509_TRUST_TSA, 0, check_purpose_timestamp_sign, "Time Stamp signing", "timestampsign", NULL}, }; #define X509_PURPOSE_COUNT (sizeof(xstandard)/sizeof(X509_PURPOSE)) @@ -120,6 +122,16 @@ int X509_check_purpose(X509 *x, int id, int ca) return pt->check_purpose(pt, x, ca); } +int X509_PURPOSE_set(int *p, int purpose) +{ + if(X509_PURPOSE_get_by_id(purpose) == -1) { + X509V3err(X509V3_F_X509_PURPOSE_SET, X509V3_R_INVALID_PURPOSE); + return 0; + } + *p = purpose; + return 1; +} + int X509_PURPOSE_get_count(void) { if(!xptable) return X509_PURPOSE_COUNT; @@ -129,7 +141,7 @@ int X509_PURPOSE_get_count(void) X509_PURPOSE * X509_PURPOSE_get0(int idx) { if(idx < 0) return NULL; - if(idx < X509_PURPOSE_COUNT) return xstandard + idx; + if(idx < (int)X509_PURPOSE_COUNT) return xstandard + idx; return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT); } @@ -144,7 +156,6 @@ int X509_PURPOSE_get_by_sname(char *sname) return -1; } - int X509_PURPOSE_get_by_id(int purpose) { X509_PURPOSE tmp; @@ -230,7 +241,7 @@ static void xptable_free(X509_PURPOSE *p) void X509_PURPOSE_cleanup(void) { - int i; + unsigned int i; sk_X509_PURPOSE_pop_free(xptable, xptable_free); for(i = 0; i < X509_PURPOSE_COUNT; i++) xptable_free(xstandard + i); xptable = NULL; @@ -256,21 +267,107 @@ int X509_PURPOSE_get_trust(X509_PURPOSE *xp) return xp->trust; } +static int nid_cmp(const int *a, const int *b) + { + return *a - *b; + } + +DECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid); +IMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid); + +int X509_supported_extension(X509_EXTENSION *ex) + { + /* This table is a list of the NIDs of supported extensions: + * that is those which are used by the verify process. If + * an extension is critical and doesn't appear in this list + * then the verify process will normally reject the certificate. + * The list must be kept in numerical order because it will be + * searched using bsearch. + */ + + static const int supported_nids[] = { + NID_netscape_cert_type, /* 71 */ + NID_key_usage, /* 83 */ + NID_subject_alt_name, /* 85 */ + NID_basic_constraints, /* 87 */ + NID_certificate_policies, /* 89 */ + NID_ext_key_usage, /* 126 */ +#ifndef OPENSSL_NO_RFC3779 + NID_sbgp_ipAddrBlock, /* 290 */ + NID_sbgp_autonomousSysNum, /* 291 */ +#endif + NID_policy_constraints, /* 401 */ + NID_proxyCertInfo, /* 663 */ + NID_name_constraints, /* 666 */ + NID_policy_mappings, /* 747 */ + NID_inhibit_any_policy /* 748 */ + }; + + int ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex)); + + if (ex_nid == NID_undef) + return 0; + + if (OBJ_bsearch_nid(&ex_nid, supported_nids, + sizeof(supported_nids)/sizeof(int))) + return 1; + return 0; + } + +static void setup_dp(X509 *x, DIST_POINT *dp) + { + X509_NAME *iname = NULL; + int i; + if (dp->reasons) + { + if (dp->reasons->length > 0) + dp->dp_reasons = dp->reasons->data[0]; + if (dp->reasons->length > 1) + dp->dp_reasons |= (dp->reasons->data[1] << 8); + dp->dp_reasons &= CRLDP_ALL_REASONS; + } + else + dp->dp_reasons = CRLDP_ALL_REASONS; + if (!dp->distpoint || (dp->distpoint->type != 1)) + return; + for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) + { + GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i); + if (gen->type == GEN_DIRNAME) + { + iname = gen->d.directoryName; + break; + } + } + if (!iname) + iname = X509_get_issuer_name(x); + + DIST_POINT_set_dpname(dp->distpoint, iname); + + } + +static void setup_crldp(X509 *x) + { + int i; + x->crldp = X509_get_ext_d2i(x, NID_crl_distribution_points, NULL, NULL); + for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++) + setup_dp(x, sk_DIST_POINT_value(x->crldp, i)); + } + static void x509v3_cache_extensions(X509 *x) { BASIC_CONSTRAINTS *bs; + PROXY_CERT_INFO_EXTENSION *pci; ASN1_BIT_STRING *usage; ASN1_BIT_STRING *ns; EXTENDED_KEY_USAGE *extusage; + X509_EXTENSION *ex; int i; if(x->ex_flags & EXFLAG_SET) return; -#ifndef NO_SHA +#ifndef OPENSSL_NO_SHA X509_digest(x, EVP_sha1(), x->sha1_hash, NULL); #endif - /* Does subject name match issuer ? */ - if(!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x))) - x->ex_flags |= EXFLAG_SS; /* V1 should mean no extensions ... */ if(!X509_get_version(x)) x->ex_flags |= EXFLAG_V1; /* Handle basic constraints */ @@ -286,6 +383,20 @@ static void x509v3_cache_extensions(X509 *x) BASIC_CONSTRAINTS_free(bs); x->ex_flags |= EXFLAG_BCONS; } + /* Handle proxy certificates */ + if((pci=X509_get_ext_d2i(x, NID_proxyCertInfo, NULL, NULL))) { + if (x->ex_flags & EXFLAG_CA + || X509_get_ext_by_NID(x, NID_subject_alt_name, 0) >= 0 + || X509_get_ext_by_NID(x, NID_issuer_alt_name, 0) >= 0) { + x->ex_flags |= EXFLAG_INVALID; + } + if (pci->pcPathLengthConstraint) { + x->ex_pcpathlen = + ASN1_INTEGER_get(pci->pcPathLengthConstraint); + } else x->ex_pcpathlen = -1; + PROXY_CERT_INFO_EXTENSION_free(pci); + x->ex_flags |= EXFLAG_PROXY; + } /* Handle key usage */ if((usage=X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) { if(usage->length > 0) { @@ -320,6 +431,23 @@ static void x509v3_cache_extensions(X509 *x) case NID_ms_sgc: case NID_ns_sgc: x->ex_xkusage |= XKU_SGC; + break; + + case NID_OCSP_sign: + x->ex_xkusage |= XKU_OCSP_SIGN; + break; + + case NID_time_stamp: + x->ex_xkusage |= XKU_TIMESTAMP; + break; + + case NID_dvcs: + x->ex_xkusage |= XKU_DVCS; + break; + + case NID_anyExtendedKeyUsage: + x->ex_xkusage |= XKU_ANYEKU; + break; } } sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free); @@ -333,6 +461,39 @@ static void x509v3_cache_extensions(X509 *x) } x->skid =X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL); x->akid =X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL); + /* Does subject name match issuer ? */ + if(!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x))) + { + x->ex_flags |= EXFLAG_SI; + /* If SKID matches AKID also indicate self signed */ + if (X509_check_akid(x, x->akid) == X509_V_OK) + x->ex_flags |= EXFLAG_SS; + } + x->altname = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL); + x->nc = X509_get_ext_d2i(x, NID_name_constraints, &i, NULL); + if (!x->nc && (i != -1)) + x->ex_flags |= EXFLAG_INVALID; + setup_crldp(x); + +#ifndef OPENSSL_NO_RFC3779 + x->rfc3779_addr =X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL); + x->rfc3779_asid =X509_get_ext_d2i(x, NID_sbgp_autonomousSysNum, + NULL, NULL); +#endif + for (i = 0; i < X509_get_ext_count(x); i++) + { + ex = X509_get_ext(x, i); + if (!X509_EXTENSION_get_critical(ex)) + continue; + if (OBJ_obj2nid(X509_EXTENSION_get_object(ex)) + == NID_freshest_crl) + x->ex_flags |= EXFLAG_FRESHEST; + if (!X509_supported_extension(ex)) + { + x->ex_flags |= EXFLAG_CRITICAL; + break; + } + } x->ex_flags |= EXFLAG_SET; } @@ -342,6 +503,7 @@ static void x509v3_cache_extensions(X509 *x) * 1 is a CA * 2 basicConstraints absent so "maybe" a CA * 3 basicConstraints absent but self signed V1. + * 4 basicConstraints absent but keyUsage present and keyCertSign asserted. */ #define V1_ROOT (EXFLAG_V1|EXFLAG_SS) @@ -352,7 +514,7 @@ static void x509v3_cache_extensions(X509 *x) #define ns_reject(x, usage) \ (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage))) -static int ca_check(const X509 *x) +static int check_ca(const X509 *x) { /* keyUsage if present should allow cert signing */ if(ku_reject(x, KU_KEY_CERT_SIGN)) return 0; @@ -361,37 +523,57 @@ static int ca_check(const X509 *x) /* If basicConstraints says not a CA then say so */ else return 0; } else { + /* we support V1 roots for... uh, I don't really know why. */ if((x->ex_flags & V1_ROOT) == V1_ROOT) return 3; - else return 2; + /* If key usage present it must have certSign so tolerate it */ + else if (x->ex_flags & EXFLAG_KUSAGE) return 4; + /* Older certificates could have Netscape-specific CA types */ + else if (x->ex_flags & EXFLAG_NSCERT + && x->ex_nscert & NS_ANY_CA) return 5; + /* can this still be regarded a CA certificate? I doubt it */ + return 0; + } +} + +int X509_check_ca(X509 *x) +{ + if(!(x->ex_flags & EXFLAG_SET)) { + CRYPTO_w_lock(CRYPTO_LOCK_X509); + x509v3_cache_extensions(x); + CRYPTO_w_unlock(CRYPTO_LOCK_X509); } + + return check_ca(x); } /* Check SSL CA: common checks for SSL client and server */ static int check_ssl_ca(const X509 *x) { int ca_ret; - ca_ret = ca_check(x); + ca_ret = check_ca(x); if(!ca_ret) return 0; /* check nsCertType if present */ - if(x->ex_flags & EXFLAG_NSCERT) { - if(x->ex_nscert & NS_SSL_CA) return ca_ret; - return 0; - } - if(ca_ret != 2) return ca_ret; + if(ca_ret != 5 || x->ex_nscert & NS_SSL_CA) return ca_ret; else return 0; } - + static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, int ca) { if(xku_reject(x,XKU_SSL_CLIENT)) return 0; if(ca) return check_ssl_ca(x); - /* We need to do digital signatures with it */ - if(ku_reject(x,KU_DIGITAL_SIGNATURE)) return 0; + /* We need to do digital signatures or key agreement */ + if(ku_reject(x,KU_DIGITAL_SIGNATURE|KU_KEY_AGREEMENT)) return 0; /* nsCertType if present should allow SSL client use */ if(ns_reject(x, NS_SSL_CLIENT)) return 0; return 1; } +/* Key usage needed for TLS/SSL server: digital signature, encipherment or + * key agreement. The ssl code can check this more thoroughly for individual + * key types. + */ +#define KU_TLS \ + KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca) { @@ -399,8 +581,7 @@ static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, int c if(ca) return check_ssl_ca(x); if(ns_reject(x, NS_SSL_SERVER)) return 0; - /* Now as for keyUsage: we'll at least need to sign OR encipher */ - if(ku_reject(x, KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT)) return 0; + if(ku_reject(x, KU_TLS)) return 0; return 1; @@ -422,14 +603,10 @@ static int purpose_smime(const X509 *x, int ca) if(xku_reject(x,XKU_SMIME)) return 0; if(ca) { int ca_ret; - ca_ret = ca_check(x); + ca_ret = check_ca(x); if(!ca_ret) return 0; /* check nsCertType if present */ - if(x->ex_flags & EXFLAG_NSCERT) { - if(x->ex_nscert & NS_SMIME_CA) return ca_ret; - return 0; - } - if(ca_ret != 2) return ca_ret; + if(ca_ret != 5 || x->ex_nscert & NS_SMIME_CA) return ca_ret; else return 0; } if(x->ex_flags & EXFLAG_NSCERT) { @@ -446,7 +623,7 @@ static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x, int c int ret; ret = purpose_smime(x, ca); if(!ret || ca) return ret; - if(ku_reject(x, KU_DIGITAL_SIGNATURE)) return 0; + if(ku_reject(x, KU_DIGITAL_SIGNATURE|KU_NON_REPUDIATION)) return 0; return ret; } @@ -463,13 +640,61 @@ static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x, int ca) { if(ca) { int ca_ret; - if((ca_ret = ca_check(x)) != 2) return ca_ret; + if((ca_ret = check_ca(x)) != 2) return ca_ret; else return 0; } if(ku_reject(x, KU_CRL_SIGN)) return 0; return 1; } +/* OCSP helper: this is *not* a full OCSP check. It just checks that + * each CA is valid. Additional checks must be made on the chain. + */ + +static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca) +{ + /* Must be a valid CA. Should we really support the "I don't know" + value (2)? */ + if(ca) return check_ca(x); + /* leaf certificate is checked in OCSP_verify() */ + return 1; +} + +static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x, + int ca) +{ + int i_ext; + + /* If ca is true we must return if this is a valid CA certificate. */ + if (ca) return check_ca(x); + + /* + * Check the optional key usage field: + * if Key Usage is present, it must be one of digitalSignature + * and/or nonRepudiation (other values are not consistent and shall + * be rejected). + */ + if ((x->ex_flags & EXFLAG_KUSAGE) + && ((x->ex_kusage & ~(KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)) || + !(x->ex_kusage & (KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)))) + return 0; + + /* Only time stamp key usage is permitted and it's required. */ + if (!(x->ex_flags & EXFLAG_XKUSAGE) || x->ex_xkusage != XKU_TIMESTAMP) + return 0; + + /* Extended Key Usage MUST be critical */ + i_ext = X509_get_ext_by_NID((X509 *) x, NID_ext_key_usage, 0); + if (i_ext >= 0) + { + X509_EXTENSION *ext = X509_get_ext((X509 *) x, i_ext); + if (!X509_EXTENSION_get_critical(ext)) + return 0; + } + + return 1; +} + static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca) { return 1; @@ -494,40 +719,63 @@ int X509_check_issued(X509 *issuer, X509 *subject) return X509_V_ERR_SUBJECT_ISSUER_MISMATCH; x509v3_cache_extensions(issuer); x509v3_cache_extensions(subject); - if(subject->akid) { - /* Check key ids (if present) */ - if(subject->akid->keyid && issuer->skid && - ASN1_OCTET_STRING_cmp(subject->akid->keyid, issuer->skid) ) + + if(subject->akid) + { + int ret = X509_check_akid(issuer, subject->akid); + if (ret != X509_V_OK) + return ret; + } + + if(subject->ex_flags & EXFLAG_PROXY) + { + if(ku_reject(issuer, KU_DIGITAL_SIGNATURE)) + return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE; + } + else if(ku_reject(issuer, KU_KEY_CERT_SIGN)) + return X509_V_ERR_KEYUSAGE_NO_CERTSIGN; + return X509_V_OK; +} + +int X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid) + { + + if(!akid) + return X509_V_OK; + + /* Check key ids (if present) */ + if(akid->keyid && issuer->skid && + ASN1_OCTET_STRING_cmp(akid->keyid, issuer->skid) ) return X509_V_ERR_AKID_SKID_MISMATCH; - /* Check serial number */ - if(subject->akid->serial && - ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), - subject->akid->serial)) + /* Check serial number */ + if(akid->serial && + ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), akid->serial)) return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH; - /* Check issuer name */ - if(subject->akid->issuer) { - /* Ugh, for some peculiar reason AKID includes - * SEQUENCE OF GeneralName. So look for a DirName. - * There may be more than one but we only take any - * notice of the first. - */ - GENERAL_NAMES *gens; - GENERAL_NAME *gen; - X509_NAME *nm = NULL; - int i; - gens = subject->akid->issuer; - for(i = 0; i < sk_GENERAL_NAME_num(gens); i++) { - gen = sk_GENERAL_NAME_value(gens, i); - if(gen->type == GEN_DIRNAME) { - nm = gen->d.dirn; - break; + /* Check issuer name */ + if(akid->issuer) + { + /* Ugh, for some peculiar reason AKID includes + * SEQUENCE OF GeneralName. So look for a DirName. + * There may be more than one but we only take any + * notice of the first. + */ + GENERAL_NAMES *gens; + GENERAL_NAME *gen; + X509_NAME *nm = NULL; + int i; + gens = akid->issuer; + for(i = 0; i < sk_GENERAL_NAME_num(gens); i++) + { + gen = sk_GENERAL_NAME_value(gens, i); + if(gen->type == GEN_DIRNAME) + { + nm = gen->d.dirn; + break; } } - if(nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer))) - return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH; + if(nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer))) + return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH; } - } - if(ku_reject(issuer, KU_KEY_CERT_SIGN)) return X509_V_ERR_KEYUSAGE_NO_CERTSIGN; return X509_V_OK; -} + }