diff options
Diffstat (limited to 'crypto/openssl/crypto/x509v3/v3_purp.c')
-rw-r--r-- | crypto/openssl/crypto/x509v3/v3_purp.c | 463 |
1 files changed, 463 insertions, 0 deletions
diff --git a/crypto/openssl/crypto/x509v3/v3_purp.c b/crypto/openssl/crypto/x509v3/v3_purp.c new file mode 100644 index 0000000..5594a1d --- /dev/null +++ b/crypto/openssl/crypto/x509v3/v3_purp.c @@ -0,0 +1,463 @@ +/* v3_purp.c */ +/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL + * project 1999. + */ +/* ==================================================================== + * Copyright (c) 1999 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 + * 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. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * licensing@OpenSSL.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED 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 OpenSSL PROJECT OR + * ITS 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. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). + * + */ + +#include <stdio.h> +#include "cryptlib.h" +#include <openssl/x509v3.h> + + +static void x509v3_cache_extensions(X509 *x); + +static int ca_check(X509 *x); +static int check_purpose_ssl_client(X509_PURPOSE *xp, X509 *x, int ca); +static int check_purpose_ssl_server(X509_PURPOSE *xp, X509 *x, int ca); +static int check_purpose_ns_ssl_server(X509_PURPOSE *xp, X509 *x, int ca); +static int purpose_smime(X509 *x, int ca); +static int check_purpose_smime_sign(X509_PURPOSE *xp, X509 *x, int ca); +static int check_purpose_smime_encrypt(X509_PURPOSE *xp, X509 *x, int ca); +static int check_purpose_crl_sign(X509_PURPOSE *xp, X509 *x, int ca); +static int no_check(X509_PURPOSE *xp, X509 *x, int ca); + +static int xp_cmp(X509_PURPOSE **a, X509_PURPOSE **b); +static void xptable_free(X509_PURPOSE *p); + +static X509_PURPOSE xstandard[] = { + {X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0, check_purpose_ssl_client, "SSL client", "sslclient", NULL}, + {X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ssl_server, "SSL server", "sslserver", NULL}, + {X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL}, + {X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign, "S/MIME signing", "smimesign", NULL}, + {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}, +}; + +#define X509_PURPOSE_COUNT (sizeof(xstandard)/sizeof(X509_PURPOSE)) + +IMPLEMENT_STACK_OF(X509_PURPOSE) + +static STACK_OF(X509_PURPOSE) *xptable = NULL; + +static int xp_cmp(X509_PURPOSE **a, X509_PURPOSE **b) +{ + return (*a)->purpose - (*b)->purpose; +} + +int X509_check_purpose(X509 *x, int id, int ca) +{ + int idx; + X509_PURPOSE *pt; + if(!(x->ex_flags & EXFLAG_SET)) { + CRYPTO_w_lock(CRYPTO_LOCK_X509); + x509v3_cache_extensions(x); + CRYPTO_w_unlock(CRYPTO_LOCK_X509); + } + if(id == -1) return 1; + idx = X509_PURPOSE_get_by_id(id); + if(idx == -1) return -1; + pt = X509_PURPOSE_get0(idx); + return pt->check_purpose(pt, x, ca); +} + +int X509_PURPOSE_get_count(void) +{ + if(!xptable) return X509_PURPOSE_COUNT; + return sk_X509_PURPOSE_num(xptable) + X509_PURPOSE_COUNT; +} + +X509_PURPOSE * X509_PURPOSE_get0(int idx) +{ + if(idx < 0) return NULL; + if(idx < X509_PURPOSE_COUNT) return xstandard + idx; + return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT); +} + +int X509_PURPOSE_get_by_sname(char *sname) +{ + int i; + X509_PURPOSE *xptmp; + for(i = 0; i < X509_PURPOSE_get_count(); i++) { + xptmp = X509_PURPOSE_get0(i); + if(!strcmp(xptmp->sname, sname)) return i; + } + return -1; +} + + +int X509_PURPOSE_get_by_id(int purpose) +{ + X509_PURPOSE tmp; + int idx; + if((purpose >= X509_PURPOSE_MIN) && (purpose <= X509_PURPOSE_MAX)) + return purpose - X509_PURPOSE_MIN; + tmp.purpose = purpose; + if(!xptable) return -1; + idx = sk_X509_PURPOSE_find(xptable, &tmp); + if(idx == -1) return -1; + return idx + X509_PURPOSE_COUNT; +} + +int X509_PURPOSE_add(int id, int trust, int flags, + int (*ck)(X509_PURPOSE *, X509 *, int), + char *name, char *sname, void *arg) +{ + int idx; + X509_PURPOSE *ptmp; + /* This is set according to what we change: application can't set it */ + flags &= ~X509_PURPOSE_DYNAMIC; + /* This will always be set for application modified trust entries */ + flags |= X509_PURPOSE_DYNAMIC_NAME; + /* Get existing entry if any */ + idx = X509_PURPOSE_get_by_id(id); + /* Need a new entry */ + if(idx == -1) { + if(!(ptmp = Malloc(sizeof(X509_PURPOSE)))) { + X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE); + return 0; + } + ptmp->flags = X509_PURPOSE_DYNAMIC; + } else ptmp = X509_PURPOSE_get0(idx); + + /* Free existing name if dynamic */ + if(ptmp->flags & X509_PURPOSE_DYNAMIC_NAME) { + Free(ptmp->name); + Free(ptmp->sname); + } + /* dup supplied name */ + ptmp->name = BUF_strdup(name); + ptmp->sname = BUF_strdup(sname); + if(!ptmp->name || !ptmp->sname) { + X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE); + return 0; + } + /* Keep the dynamic flag of existing entry */ + ptmp->flags &= X509_PURPOSE_DYNAMIC; + /* Set all other flags */ + ptmp->flags |= flags; + + ptmp->purpose = id; + ptmp->trust = trust; + ptmp->check_purpose = ck; + ptmp->usr_data = arg; + + /* If its a new entry manage the dynamic table */ + if(idx == -1) { + if(!xptable && !(xptable = sk_X509_PURPOSE_new(xp_cmp))) { + X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE); + return 0; + } + if (!sk_X509_PURPOSE_push(xptable, ptmp)) { + X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE); + return 0; + } + } + return 1; +} + +static void xptable_free(X509_PURPOSE *p) + { + if(!p) return; + if (p->flags & X509_PURPOSE_DYNAMIC) + { + if (p->flags & X509_PURPOSE_DYNAMIC_NAME) { + Free(p->name); + Free(p->sname); + } + Free(p); + } + } + +void X509_PURPOSE_cleanup(void) +{ + int i; + sk_X509_PURPOSE_pop_free(xptable, xptable_free); + for(i = 0; i < X509_PURPOSE_COUNT; i++) xptable_free(xstandard + i); + xptable = NULL; +} + +int X509_PURPOSE_get_id(X509_PURPOSE *xp) +{ + return xp->purpose; +} + +char *X509_PURPOSE_get0_name(X509_PURPOSE *xp) +{ + return xp->name; +} + +char *X509_PURPOSE_get0_sname(X509_PURPOSE *xp) +{ + return xp->sname; +} + +int X509_PURPOSE_get_trust(X509_PURPOSE *xp) +{ + return xp->trust; +} + +#ifndef NO_SHA +static void x509v3_cache_extensions(X509 *x) +{ + BASIC_CONSTRAINTS *bs; + ASN1_BIT_STRING *usage; + ASN1_BIT_STRING *ns; + STACK_OF(ASN1_OBJECT) *extusage; + int i; + if(x->ex_flags & EXFLAG_SET) return; + X509_digest(x, EVP_sha1(), x->sha1_hash, NULL); + /* 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 */ + if((bs=X509_get_ext_d2i(x, NID_basic_constraints, NULL, NULL))) { + if(bs->ca) x->ex_flags |= EXFLAG_CA; + if(bs->pathlen) { + if((bs->pathlen->type == V_ASN1_NEG_INTEGER) + || !bs->ca) { + x->ex_flags |= EXFLAG_INVALID; + x->ex_pathlen = 0; + } else x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen); + } else x->ex_pathlen = -1; + BASIC_CONSTRAINTS_free(bs); + x->ex_flags |= EXFLAG_BCONS; + } + /* Handle key usage */ + if((usage=X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) { + if(usage->length > 0) { + x->ex_kusage = usage->data[0]; + if(usage->length > 1) + x->ex_kusage |= usage->data[1] << 8; + } else x->ex_kusage = 0; + x->ex_flags |= EXFLAG_KUSAGE; + ASN1_BIT_STRING_free(usage); + } + x->ex_xkusage = 0; + if((extusage=X509_get_ext_d2i(x, NID_ext_key_usage, NULL, NULL))) { + x->ex_flags |= EXFLAG_XKUSAGE; + for(i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) { + switch(OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage,i))) { + case NID_server_auth: + x->ex_xkusage |= XKU_SSL_SERVER; + break; + + case NID_client_auth: + x->ex_xkusage |= XKU_SSL_CLIENT; + break; + + case NID_email_protect: + x->ex_xkusage |= XKU_SMIME; + break; + + case NID_code_sign: + x->ex_xkusage |= XKU_CODE_SIGN; + break; + + case NID_ms_sgc: + case NID_ns_sgc: + x->ex_xkusage |= XKU_SGC; + } + } + sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free); + } + + if((ns=X509_get_ext_d2i(x, NID_netscape_cert_type, NULL, NULL))) { + if(ns->length > 0) x->ex_nscert = ns->data[0]; + else x->ex_nscert = 0; + x->ex_flags |= EXFLAG_NSCERT; + ASN1_BIT_STRING_free(ns); + } + x->ex_flags |= EXFLAG_SET; +} +#endif + +/* CA checks common to all purposes + * return codes: + * 0 not a CA + * 1 is a CA + * 2 basicConstraints absent so "maybe" a CA + * 3 basicConstraints absent but self signed V1. + */ + +#define V1_ROOT (EXFLAG_V1|EXFLAG_SS) +#define ku_reject(x, usage) \ + (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage))) +#define xku_reject(x, usage) \ + (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage))) +#define ns_reject(x, usage) \ + (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage))) + +static int ca_check(X509 *x) +{ + /* keyUsage if present should allow cert signing */ + if(ku_reject(x, KU_KEY_CERT_SIGN)) return 0; + if(x->ex_flags & EXFLAG_BCONS) { + if(x->ex_flags & EXFLAG_CA) return 1; + /* If basicConstraints says not a CA then say so */ + else return 0; + } else { + if((x->ex_flags & V1_ROOT) == V1_ROOT) return 3; + else return 2; + } +} + + +static int check_purpose_ssl_client(X509_PURPOSE *xp, X509 *x, int ca) +{ + if(xku_reject(x,XKU_SSL_CLIENT)) return 0; + if(ca) { + int ca_ret; + ca_ret = ca_check(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; + else return 0; + } + /* We need to do digital signatures with it */ + if(ku_reject(x,KU_DIGITAL_SIGNATURE)) return 0; + /* nsCertType if present should allow SSL client use */ + if(ns_reject(x, NS_SSL_CLIENT)) return 0; + return 1; +} + +static int check_purpose_ssl_server(X509_PURPOSE *xp, X509 *x, int ca) +{ + if(xku_reject(x,XKU_SSL_SERVER|XKU_SGC)) return 0; + /* Otherwise same as SSL client for a CA */ + if(ca) return check_purpose_ssl_client(xp, x, 1); + + 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; + + return 1; + +} + +static int check_purpose_ns_ssl_server(X509_PURPOSE *xp, X509 *x, int ca) +{ + int ret; + ret = check_purpose_ssl_server(xp, x, ca); + if(!ret || ca) return ret; + /* We need to encipher or Netscape complains */ + if(ku_reject(x, KU_KEY_ENCIPHERMENT)) return 0; + return ret; +} + +/* common S/MIME checks */ +static int purpose_smime(X509 *x, int ca) +{ + if(xku_reject(x,XKU_SMIME)) return 0; + if(ca) { + int ca_ret; + ca_ret = ca_check(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; + else return 0; + } + if(x->ex_flags & EXFLAG_NSCERT) { + if(x->ex_nscert & NS_SMIME) return 1; + /* Workaround for some buggy certificates */ + if(x->ex_nscert & NS_SSL_CLIENT) return 2; + return 0; + } + return 1; +} + +static int check_purpose_smime_sign(X509_PURPOSE *xp, X509 *x, int ca) +{ + int ret; + ret = purpose_smime(x, ca); + if(!ret || ca) return ret; + if(ku_reject(x, KU_DIGITAL_SIGNATURE)) return 0; + return ret; +} + +static int check_purpose_smime_encrypt(X509_PURPOSE *xp, X509 *x, int ca) +{ + int ret; + ret = purpose_smime(x, ca); + if(!ret || ca) return ret; + if(ku_reject(x, KU_KEY_ENCIPHERMENT)) return 0; + return ret; +} + +static int check_purpose_crl_sign(X509_PURPOSE *xp, X509 *x, int ca) +{ + if(ca) { + int ca_ret; + if((ca_ret = ca_check(x)) != 2) return ca_ret; + else return 0; + } + if(ku_reject(x, KU_CRL_SIGN)) return 0; + return 1; +} + +static int no_check(X509_PURPOSE *xp, X509 *x, int ca) +{ + return 1; +} |