/* _ _ ** _ __ ___ ___ __| | ___ ___| | mod_ssl ** | '_ ` _ \ / _ \ / _` | / __/ __| | Apache Interface to OpenSSL ** | | | | | | (_) | (_| | \__ \__ \ | www.modssl.org ** |_| |_| |_|\___/ \__,_|___|___/___/_| ftp.modssl.org ** |_____| ** ssl_util_ssl.c ** Additional Utility Functions for OpenSSL */ /* ==================================================================== * Copyright (c) 1998-2003 Ralf S. Engelschall. 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 * Ralf S. Engelschall for use in the * mod_ssl project (http://www.modssl.org/)." * * 4. The names "mod_ssl" must not be used to endorse or promote * products derived from this software without prior written * permission. For written permission, please contact * rse@engelschall.com. * * 5. Products derived from this software may not be called "mod_ssl" * nor may "mod_ssl" appear in their names without prior * written permission of Ralf S. Engelschall. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by * Ralf S. Engelschall for use in the * mod_ssl project (http://www.modssl.org/)." * * THIS SOFTWARE IS PROVIDED BY RALF S. ENGELSCHALL ``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 RALF S. ENGELSCHALL OR * HIS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== */ #include "mod_ssl.h" /* _________________________________________________________________ ** ** Additional High-Level Functions for OpenSSL ** _________________________________________________________________ */ int SSL_get_app_data2_idx(void) { static int app_data2_idx = -1; if (app_data2_idx < 0) { app_data2_idx = SSL_get_ex_new_index(0, "Second Application Data for SSL", NULL, NULL, NULL); app_data2_idx = SSL_get_ex_new_index(0, "Second Application Data for SSL", NULL, NULL, NULL); } return(app_data2_idx); } void *SSL_get_app_data2(SSL *ssl) { return (void *)SSL_get_ex_data(ssl, SSL_get_app_data2_idx()); } void SSL_set_app_data2(SSL *ssl, void *arg) { SSL_set_ex_data(ssl, SSL_get_app_data2_idx(), (char *)arg); return; } /* _________________________________________________________________ ** ** High-Level Certificate / Private Key Loading ** _________________________________________________________________ */ X509 *SSL_read_X509(FILE *fp, X509 **x509, int (*cb)()) { X509 *rc; BIO *bioS; BIO *bioF; /* 1. try PEM (= DER+Base64+headers) */ rc = PEM_read_X509(fp, x509, cb, NULL); if (rc == NULL) { /* 2. try DER+Base64 */ fseek(fp, 0L, SEEK_SET); if ((bioS = BIO_new(BIO_s_fd())) == NULL) return NULL; BIO_set_fd(bioS, fileno(fp), BIO_NOCLOSE); if ((bioF = BIO_new(BIO_f_base64())) == NULL) { BIO_free(bioS); return NULL; } bioS = BIO_push(bioF, bioS); rc = d2i_X509_bio(bioS, NULL); BIO_free_all(bioS); if (rc == NULL) { /* 3. try plain DER */ fseek(fp, 0L, SEEK_SET); if ((bioS = BIO_new(BIO_s_fd())) == NULL) return NULL; BIO_set_fd(bioS, fileno(fp), BIO_NOCLOSE); rc = d2i_X509_bio(bioS, NULL); BIO_free(bioS); } } if (rc != NULL && x509 != NULL) { if (*x509 != NULL) X509_free(*x509); *x509 = rc; } return rc; } EVP_PKEY *SSL_read_PrivateKey(FILE *fp, EVP_PKEY **key, int (*cb)()) { EVP_PKEY *rc; BIO *bioS; BIO *bioF; /* 1. try PEM (= DER+Base64+headers) */ rc = PEM_read_PrivateKey(fp, key, cb, NULL); if (rc == NULL) { /* 2. try DER+Base64 */ fseek(fp, 0L, SEEK_SET); if ((bioS = BIO_new(BIO_s_fd())) == NULL) return NULL; BIO_set_fd(bioS, fileno(fp), BIO_NOCLOSE); if ((bioF = BIO_new(BIO_f_base64())) == NULL) { BIO_free(bioS); return NULL; } bioS = BIO_push(bioF, bioS); rc = d2i_PrivateKey_bio(bioS, NULL); BIO_free_all(bioS); if (rc == NULL) { /* 3. try plain DER */ fseek(fp, 0L, SEEK_SET); if ((bioS = BIO_new(BIO_s_fd())) == NULL) return NULL; BIO_set_fd(bioS, fileno(fp), BIO_NOCLOSE); rc = d2i_PrivateKey_bio(bioS, NULL); BIO_free(bioS); } } if (rc != NULL && key != NULL) { if (*key != NULL) EVP_PKEY_free(*key); *key = rc; } return rc; } /* _________________________________________________________________ ** ** Smart shutdown ** _________________________________________________________________ */ int SSL_smart_shutdown(SSL *ssl) { int i; int rc; /* * Repeat the calls, because SSL_shutdown internally dispatches through a * little state machine. Usually only one or two interation should be * needed, so we restrict the total number of restrictions in order to * avoid process hangs in case the client played bad with the socket * connection and OpenSSL cannot recognize it. */ rc = 0; for (i = 0; i < 4 /* max 2x pending + 2x data = 4 */; i++) { if ((rc = SSL_shutdown(ssl))) break; } return rc; } /* _________________________________________________________________ ** ** Certificate Revocation List (CRL) Storage ** _________________________________________________________________ */ X509_STORE *SSL_X509_STORE_create(char *cpFile, char *cpPath) { X509_STORE *pStore; X509_LOOKUP *pLookup; if (cpFile == NULL && cpPath == NULL) return NULL; if ((pStore = X509_STORE_new()) == NULL) return NULL; if (cpFile != NULL) { if ((pLookup = X509_STORE_add_lookup(pStore, X509_LOOKUP_file())) == NULL) { X509_STORE_free(pStore); return NULL; } X509_LOOKUP_load_file(pLookup, cpFile, X509_FILETYPE_PEM); } if (cpPath != NULL) { if ((pLookup = X509_STORE_add_lookup(pStore, X509_LOOKUP_hash_dir())) == NULL) { X509_STORE_free(pStore); return NULL; } X509_LOOKUP_add_dir(pLookup, cpPath, X509_FILETYPE_PEM); } return pStore; } int SSL_X509_STORE_lookup(X509_STORE *pStore, int nType, X509_NAME *pName, X509_OBJECT *pObj) { X509_STORE_CTX pStoreCtx; int rc; X509_STORE_CTX_init(&pStoreCtx, pStore, NULL, NULL); rc = X509_STORE_get_by_subject(&pStoreCtx, nType, pName, pObj); X509_STORE_CTX_cleanup(&pStoreCtx); return rc; } /* _________________________________________________________________ ** ** Cipher Suite Spec String Creation ** _________________________________________________________________ */ char *SSL_make_ciphersuite(pool *p, SSL *ssl) { STACK_OF(SSL_CIPHER) *sk; SSL_CIPHER *c; int i; int l; char *cpCipherSuite; char *cp; if (ssl == NULL) return ""; if ((sk = SSL_get_ciphers(ssl)) == NULL) return ""; l = 0; for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) { c = sk_SSL_CIPHER_value(sk, i); l += strlen(c->name)+2+1; } if (l == 0) return ""; cpCipherSuite = (char *)ap_palloc(p, l+1); cp = cpCipherSuite; for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) { c = sk_SSL_CIPHER_value(sk, i); l = strlen(c->name); memcpy(cp, c->name, l); cp += l; *cp++ = '/'; *cp++ = (c->valid == 1 ? '1' : '0'); *cp++ = ':'; } *(cp-1) = NUL; return cpCipherSuite; } /* _________________________________________________________________ ** ** Certificate Checks ** _________________________________________________________________ */ /* check whether cert contains extended key usage with a SGC tag */ BOOL SSL_X509_isSGC(X509 *cert) { X509_EXTENSION *ext; int ext_nid; STACK_OF(ASN1_OBJECT) *sk; BOOL is_sgc; int idx; int i; is_sgc = FALSE; idx = X509_get_ext_by_NID(cert, NID_ext_key_usage, -1); if (idx >= 0) { ext = X509_get_ext(cert, idx); if ((sk = (STACK_OF(ASN1_OBJECT)*) X509V3_EXT_d2i(ext)) != NULL) { for (i = 0; i < sk_ASN1_OBJECT_num(sk); i++) { ext_nid = OBJ_obj2nid(sk_ASN1_OBJECT_value(sk, i)); if (ext_nid == NID_ms_sgc || ext_nid == NID_ns_sgc) { is_sgc = TRUE; break; } } } } return is_sgc; } /* retrieve basic constraints ingredients */ BOOL SSL_X509_getBC(X509 *cert, int *ca, int *pathlen) { X509_EXTENSION *ext; BASIC_CONSTRAINTS *bc; int idx; BIGNUM *bn = NULL; char *cp; if ((idx = X509_get_ext_by_NID(cert, NID_basic_constraints, -1)) < 0) return FALSE; ext = X509_get_ext(cert, idx); if (ext == NULL) return FALSE; if ((bc = (BASIC_CONSTRAINTS *)X509V3_EXT_d2i(ext)) == NULL) return FALSE; *ca = bc->ca; *pathlen = -1 /* unlimited */; if (bc->pathlen != NULL) { if ((bn = ASN1_INTEGER_to_BN(bc->pathlen, NULL)) == NULL) return FALSE; if ((cp = BN_bn2dec(bn)) == NULL) return FALSE; *pathlen = atoi(cp); OPENSSL_free(cp); BN_free(bn); } BASIC_CONSTRAINTS_free(bc); return TRUE; } /* retrieve subject CommonName of certificate */ BOOL SSL_X509_getCN(pool *p, X509 *xs, char **cppCN) { X509_NAME *xsn; X509_NAME_ENTRY *xsne; int i, nid; xsn = X509_get_subject_name(xs); for (i = 0; i < sk_X509_NAME_ENTRY_num(xsn->entries); i++) { xsne = sk_X509_NAME_ENTRY_value(xsn->entries, i); nid = OBJ_obj2nid(xsne->object); if (nid == NID_commonName) { *cppCN = ap_palloc(p, xsne->value->length+1); ap_cpystrn(*cppCN, (char *)xsne->value->data, xsne->value->length+1); (*cppCN)[xsne->value->length] = NUL; return TRUE; } } return FALSE; } /* _________________________________________________________________ ** ** Low-Level CA Certificate Loading ** _________________________________________________________________ */ #ifdef SSL_EXPERIMENTAL_PROXY BOOL SSL_load_CrtAndKeyInfo_file(pool *p, STACK_OF(X509_INFO) *sk, char *filename) { BIO *in; if ((in = BIO_new(BIO_s_file())) == NULL) return FALSE; if (BIO_read_filename(in, filename) <= 0) { BIO_free(in); return FALSE; } ERR_clear_error(); PEM_X509_INFO_read_bio(in, sk, NULL, NULL); BIO_free(in); return TRUE; } BOOL SSL_load_CrtAndKeyInfo_path(pool *p, STACK_OF(X509_INFO) *sk, char *pathname) { struct stat st; DIR *dir; pool *sp; struct dirent *nextent; char *fullname; BOOL ok; sp = ap_make_sub_pool(p); if ((dir = ap_popendir(sp, pathname)) == NULL) { ap_destroy_pool(sp); return FALSE; } ok = FALSE; while ((nextent = readdir(dir)) != NULL) { fullname = ap_pstrcat(sp, pathname, "/", nextent->d_name, NULL); if (stat(fullname, &st) != 0) continue; if (!S_ISREG(st.st_mode)) continue; if (SSL_load_CrtAndKeyInfo_file(sp, sk, fullname)) ok = TRUE; } ap_pclosedir(p, dir); ap_destroy_pool(sp); return ok; } #endif /* SSL_EXPERIMENTAL_PROXY */ /* _________________________________________________________________ ** ** Extra Server Certificate Chain Support ** _________________________________________________________________ */ /* * Read a file that optionally contains the server certificate in PEM * format, possibly followed by a sequence of CA certificates that * should be sent to the peer in the SSL Certificate message. */ int SSL_CTX_use_certificate_chain( SSL_CTX *ctx, char *file, int skipfirst, int (*cb)()) { BIO *bio; X509 *x509; unsigned long err; int n; if ((bio = BIO_new(BIO_s_file_internal())) == NULL) return -1; if (BIO_read_filename(bio, file) <= 0) { BIO_free(bio); return -1; } /* optionally skip a leading server certificate */ if (skipfirst) { if ((x509 = PEM_read_bio_X509(bio, NULL, cb, NULL)) == NULL) { BIO_free(bio); return -1; } X509_free(x509); } /* free a perhaps already configured extra chain */ if (ctx->extra_certs != NULL) { sk_X509_pop_free(ctx->extra_certs, X509_free); ctx->extra_certs = NULL; } /* create new extra chain by loading the certs */ n = 0; while ((x509 = PEM_read_bio_X509(bio, NULL, cb, NULL)) != NULL) { if (!SSL_CTX_add_extra_chain_cert(ctx, x509)) { X509_free(x509); BIO_free(bio); return -1; } n++; } /* Make sure that only the error is just an EOF */ if ((err = ERR_peek_error()) > 0) { if (!( ERR_GET_LIB(err) == ERR_LIB_PEM && ERR_GET_REASON(err) == PEM_R_NO_START_LINE)) { BIO_free(bio); return -1; } while (ERR_get_error() > 0) ; } BIO_free(bio); return n; } /* _________________________________________________________________ ** ** Session Stuff ** _________________________________________________________________ */ char *SSL_SESSION_id2sz(unsigned char *id, int idlen) { static char str[(SSL_MAX_SSL_SESSION_ID_LENGTH+1)*2]; char *cp; int n; cp = str; for (n = 0; n < idlen && n < SSL_MAX_SSL_SESSION_ID_LENGTH; n++) { ap_snprintf(cp, sizeof(str)-(cp-str), "%02X", id[n]); cp += strlen(cp); } *cp = NUL; return str; }