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Diffstat (limited to '')
| -rw-r--r-- | modules/ssl/ssl_util_ssl.c | 538 |
1 files changed, 538 insertions, 0 deletions
diff --git a/modules/ssl/ssl_util_ssl.c b/modules/ssl/ssl_util_ssl.c new file mode 100644 index 0000000..b7f0eca --- /dev/null +++ b/modules/ssl/ssl_util_ssl.c @@ -0,0 +1,538 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/* _ _ + * _ __ ___ ___ __| | ___ ___| | mod_ssl + * | '_ ` _ \ / _ \ / _` | / __/ __| | Apache Interface to OpenSSL + * | | | | | | (_) | (_| | \__ \__ \ | + * |_| |_| |_|\___/ \__,_|___|___/___/_| + * |_____| + * ssl_util_ssl.c + * Additional Utility Functions for OpenSSL + */ + +#include "ssl_private.h" + +/* _________________________________________________________________ +** +** Additional High-Level Functions for OpenSSL +** _________________________________________________________________ +*/ + +/* we initialize this index at startup time + * and never write to it at request time, + * so this static is thread safe. + * also note that OpenSSL increments at static variable when + * SSL_get_ex_new_index() is called, so we _must_ do this at startup. + */ +static int app_data2_idx = -1; + +void modssl_init_app_data2_idx(void) +{ + int i; + + if (app_data2_idx > -1) { + return; + } + + /* we _do_ need to call this twice */ + for (i = 0; i <= 1; i++) { + app_data2_idx = + SSL_get_ex_new_index(0, + "Second Application Data for SSL", + NULL, NULL, NULL); + } +} + +void *modssl_get_app_data2(SSL *ssl) +{ + return (void *)SSL_get_ex_data(ssl, app_data2_idx); +} + +void modssl_set_app_data2(SSL *ssl, void *arg) +{ + SSL_set_ex_data(ssl, app_data2_idx, (char *)arg); + return; +} + +/* _________________________________________________________________ +** +** High-Level Private Key Loading +** _________________________________________________________________ +*/ + +EVP_PKEY *modssl_read_privatekey(const char* filename, EVP_PKEY **key, pem_password_cb *cb, void *s) +{ + EVP_PKEY *rc; + BIO *bioS; + BIO *bioF; + + /* 1. try PEM (= DER+Base64+headers) */ + if ((bioS=BIO_new_file(filename, "r")) == NULL) + return NULL; + rc = PEM_read_bio_PrivateKey(bioS, key, cb, s); + BIO_free(bioS); + + if (rc == NULL) { + /* 2. try DER+Base64 */ + if ((bioS = BIO_new_file(filename, "r")) == NULL) + return NULL; + + 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 */ + if ((bioS = BIO_new_file(filename, "r")) == NULL) + return NULL; + 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; +} + +typedef struct { + const char *pass; + int pass_len; +} pass_ctx; + +static int provide_pass(char *buf, int size, int rwflag, void *baton) +{ + pass_ctx *ctx = baton; + if (ctx->pass_len > 0) { + if (ctx->pass_len < size) { + size = (int)ctx->pass_len; + } + memcpy(buf, ctx->pass, size); + } + return ctx->pass_len; +} + +EVP_PKEY *modssl_read_encrypted_pkey(const char *filename, EVP_PKEY **key, + const char *pass, apr_size_t pass_len) +{ + pass_ctx ctx; + + ctx.pass = pass; + ctx.pass_len = pass_len; + return modssl_read_privatekey(filename, key, provide_pass, &ctx); +} + +/* _________________________________________________________________ +** +** Smart shutdown +** _________________________________________________________________ +*/ + +int modssl_smart_shutdown(SSL *ssl) +{ + int i; + int rc; + int flush; + + /* + * 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; + flush = !(SSL_get_shutdown(ssl) & SSL_SENT_SHUTDOWN); + for (i = 0; i < 4 /* max 2x pending + 2x data = 4 */; i++) { + rc = SSL_shutdown(ssl); + if (rc >= 0 && flush && (SSL_get_shutdown(ssl) & SSL_SENT_SHUTDOWN)) { + /* Once the close notity is sent through the output filters, + * ensure it is flushed through the socket. + */ + if (BIO_flush(SSL_get_wbio(ssl)) <= 0) { + rc = -1; + break; + } + flush = 0; + } + if (rc != 0) + break; + } + return rc; +} + +/* _________________________________________________________________ +** +** Certificate Checks +** _________________________________________________________________ +*/ + +/* retrieve basic constraints ingredients */ +BOOL modssl_X509_getBC(X509 *cert, int *ca, int *pathlen) +{ + BASIC_CONSTRAINTS *bc; + BIGNUM *bn = NULL; + char *cp; + + bc = X509_get_ext_d2i(cert, NID_basic_constraints, NULL, NULL); + if (bc == NULL) + return FALSE; + *ca = bc->ca; + *pathlen = -1 /* unlimited */; + if (bc->pathlen != NULL) { + if ((bn = ASN1_INTEGER_to_BN(bc->pathlen, NULL)) == NULL) { + BASIC_CONSTRAINTS_free(bc); + return FALSE; + } + if ((cp = BN_bn2dec(bn)) == NULL) { + BN_free(bn); + BASIC_CONSTRAINTS_free(bc); + return FALSE; + } + *pathlen = atoi(cp); + OPENSSL_free(cp); + BN_free(bn); + } + BASIC_CONSTRAINTS_free(bc); + return TRUE; +} + +/* Convert ASN.1 string to a pool-allocated char * string, escaping + * control characters. If raw is zero, convert to UTF-8, otherwise + * unchanged from the character set. */ +static char *asn1_string_convert(apr_pool_t *p, ASN1_STRING *asn1str, int raw) +{ + char *result = NULL; + BIO *bio; + int len, flags = ASN1_STRFLGS_ESC_CTRL; + + if ((bio = BIO_new(BIO_s_mem())) == NULL) + return NULL; + + if (!raw) flags |= ASN1_STRFLGS_UTF8_CONVERT; + + ASN1_STRING_print_ex(bio, asn1str, flags); + len = BIO_pending(bio); + if (len > 0) { + result = apr_palloc(p, len+1); + len = BIO_read(bio, result, len); + result[len] = NUL; + } + BIO_free(bio); + return result; +} + +#define asn1_string_to_utf8(p, a) asn1_string_convert(p, a, 0) + +/* convert a NAME_ENTRY to UTF8 string */ +char *modssl_X509_NAME_ENTRY_to_string(apr_pool_t *p, X509_NAME_ENTRY *xsne, + int raw) +{ + char *result = asn1_string_convert(p, X509_NAME_ENTRY_get_data(xsne), raw); + ap_xlate_proto_from_ascii(result, len); + return result; +} + +/* + * convert an X509_NAME to an RFC 2253 formatted string, optionally truncated + * to maxlen characters (specify a maxlen of 0 for no length limit) + */ +char *modssl_X509_NAME_to_string(apr_pool_t *p, X509_NAME *dn, int maxlen) +{ + char *result = NULL; + BIO *bio; + int len; + + if ((bio = BIO_new(BIO_s_mem())) == NULL) + return NULL; + X509_NAME_print_ex(bio, dn, 0, XN_FLAG_RFC2253); + len = BIO_pending(bio); + if (len > 0) { + result = apr_palloc(p, (maxlen > 0) ? maxlen+1 : len+1); + if (maxlen > 0 && maxlen < len) { + len = BIO_read(bio, result, maxlen); + if (maxlen > 2) { + /* insert trailing ellipsis if there's enough space */ + apr_snprintf(result + maxlen - 3, 4, "..."); + } + } else { + len = BIO_read(bio, result, len); + } + result[len] = NUL; + } + BIO_free(bio); + + return result; +} + +static void parse_otherName_value(apr_pool_t *p, ASN1_TYPE *value, + const char *onf, apr_array_header_t **entries) +{ + const char *str; + int nid = onf ? OBJ_txt2nid(onf) : NID_undef; + + if (!value || (nid == NID_undef) || !*entries) + return; + + /* + * Currently supported otherName forms (values for "onf"): + * "msUPN" (1.3.6.1.4.1.311.20.2.3): Microsoft User Principal Name + * "id-on-dnsSRV" (1.3.6.1.5.5.7.8.7): SRVName, as specified in RFC 4985 + */ + if ((nid == NID_ms_upn) && (value->type == V_ASN1_UTF8STRING) && + (str = asn1_string_to_utf8(p, value->value.utf8string))) { + APR_ARRAY_PUSH(*entries, const char *) = str; + } else if (strEQ(onf, "id-on-dnsSRV") && + (value->type == V_ASN1_IA5STRING) && + (str = asn1_string_to_utf8(p, value->value.ia5string))) { + APR_ARRAY_PUSH(*entries, const char *) = str; + } +} + +/* + * Return an array of subjectAltName entries of type "type". If idx is -1, + * return all entries of the given type, otherwise return an array consisting + * of the n-th occurrence of that type only. Currently supported types: + * GEN_EMAIL (rfc822Name) + * GEN_DNS (dNSName) + * GEN_OTHERNAME (requires the otherName form ["onf"] argument to be supplied, + * see parse_otherName_value for the currently supported forms) + */ +BOOL modssl_X509_getSAN(apr_pool_t *p, X509 *x509, int type, const char *onf, + int idx, apr_array_header_t **entries) +{ + STACK_OF(GENERAL_NAME) *names; + int nid = onf ? OBJ_txt2nid(onf) : NID_undef; + + if (!x509 || (type < GEN_OTHERNAME) || + ((type == GEN_OTHERNAME) && (nid == NID_undef)) || + (type > GEN_RID) || (idx < -1) || + !(*entries = apr_array_make(p, 0, sizeof(char *)))) { + *entries = NULL; + return FALSE; + } + + if ((names = X509_get_ext_d2i(x509, NID_subject_alt_name, NULL, NULL))) { + int i, n = 0; + GENERAL_NAME *name; + const char *utf8str; + + for (i = 0; i < sk_GENERAL_NAME_num(names); i++) { + name = sk_GENERAL_NAME_value(names, i); + + if (name->type != type) + continue; + + switch (type) { + case GEN_EMAIL: + case GEN_DNS: + if (((idx == -1) || (n == idx)) && + (utf8str = asn1_string_to_utf8(p, name->d.ia5))) { + APR_ARRAY_PUSH(*entries, const char *) = utf8str; + } + n++; + break; + case GEN_OTHERNAME: + if (OBJ_obj2nid(name->d.otherName->type_id) == nid) { + if (((idx == -1) || (n == idx))) { + parse_otherName_value(p, name->d.otherName->value, + onf, entries); + } + n++; + } + break; + default: + /* + * Not implemented right now: + * GEN_X400 (x400Address) + * GEN_DIRNAME (directoryName) + * GEN_EDIPARTY (ediPartyName) + * GEN_URI (uniformResourceIdentifier) + * GEN_IPADD (iPAddress) + * GEN_RID (registeredID) + */ + break; + } + + if ((idx != -1) && (n > idx)) + break; + } + + sk_GENERAL_NAME_pop_free(names, GENERAL_NAME_free); + } + + return apr_is_empty_array(*entries) ? FALSE : TRUE; +} + +/* return an array of (RFC 6125 coined) DNS-IDs and CN-IDs in a certificate */ +static BOOL getIDs(apr_pool_t *p, X509 *x509, apr_array_header_t **ids) +{ + X509_NAME *subj; + int i = -1; + + /* First, the DNS-IDs (dNSName entries in the subjectAltName extension) */ + if (!x509 || + (modssl_X509_getSAN(p, x509, GEN_DNS, NULL, -1, ids) == FALSE && !*ids)) { + *ids = NULL; + return FALSE; + } + + /* Second, the CN-IDs (commonName attributes in the subject DN) */ + subj = X509_get_subject_name(x509); + while ((i = X509_NAME_get_index_by_NID(subj, NID_commonName, i)) != -1) { + APR_ARRAY_PUSH(*ids, const char *) = + modssl_X509_NAME_ENTRY_to_string(p, X509_NAME_get_entry(subj, i), 0); + } + + return apr_is_empty_array(*ids) ? FALSE : TRUE; +} + +/* + * Check if a certificate matches for a particular name, by iterating over its + * DNS-IDs and CN-IDs (RFC 6125), optionally with basic wildcard matching. + * If server_rec is non-NULL, some (debug/trace) logging is enabled. + */ +BOOL modssl_X509_match_name(apr_pool_t *p, X509 *x509, const char *name, + BOOL allow_wildcard, server_rec *s) +{ + BOOL matched = FALSE; + apr_array_header_t *ids; + + /* + * At some day in the future, this might be replaced with X509_check_host() + * (available in OpenSSL 1.0.2 and later), but two points should be noted: + * 1) wildcard matching in X509_check_host() might yield different + * results (by default, it supports a broader set of patterns, e.g. + * wildcards in non-initial positions); + * 2) we lose the option of logging each DNS- and CN-ID (until a match + * is found). + */ + + if (getIDs(p, x509, &ids)) { + const char *cp; + int i; + char **id = (char **)ids->elts; + BOOL is_wildcard; + + for (i = 0; i < ids->nelts; i++) { + if (!id[i]) + continue; + + /* + * Determine if it is a wildcard ID - we're restrictive + * in the sense that we require the wildcard character to be + * THE left-most label (i.e., the ID must start with "*.") + */ + is_wildcard = (*id[i] == '*' && *(id[i]+1) == '.') ? TRUE : FALSE; + + /* + * If the ID includes a wildcard character (and the caller is + * allowing wildcards), check if it matches for the left-most + * DNS label - i.e., the wildcard character is not allowed + * to match a dot. Otherwise, try a simple string compare. + */ + if ((allow_wildcard == TRUE && is_wildcard == TRUE && + (cp = ap_strchr_c(name, '.')) && !strcasecmp(id[i]+1, cp)) || + !strcasecmp(id[i], name)) { + matched = TRUE; + } + + if (s) { + ap_log_error(APLOG_MARK, APLOG_TRACE3, 0, s, + "[%s] modssl_X509_match_name: expecting name '%s', " + "%smatched by ID '%s'", + (mySrvConfig(s))->vhost_id, name, + matched == TRUE ? "" : "NOT ", id[i]); + } + + if (matched == TRUE) { + break; + } + } + + } + + if (s) { + ssl_log_xerror(SSLLOG_MARK, APLOG_DEBUG, 0, p, s, x509, + APLOGNO(02412) "[%s] Cert %s for name '%s'", + (mySrvConfig(s))->vhost_id, + matched == TRUE ? "matches" : "does not match", + name); + } + + return matched; +} + +/* _________________________________________________________________ +** +** Custom (EC)DH parameter support +** _________________________________________________________________ +*/ + +DH *ssl_dh_GetParamFromFile(const char *file) +{ + DH *dh = NULL; + BIO *bio; + + if ((bio = BIO_new_file(file, "r")) == NULL) + return NULL; + dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); + BIO_free(bio); + return (dh); +} + +#ifdef HAVE_ECC +EC_GROUP *ssl_ec_GetParamFromFile(const char *file) +{ + EC_GROUP *group = NULL; + BIO *bio; + + if ((bio = BIO_new_file(file, "r")) == NULL) + return NULL; + group = PEM_read_bio_ECPKParameters(bio, NULL, NULL, NULL); + BIO_free(bio); + return (group); +} +#endif + +/* _________________________________________________________________ +** +** Session Stuff +** _________________________________________________________________ +*/ + +char *modssl_SSL_SESSION_id2sz(IDCONST unsigned char *id, int idlen, + char *str, int strsize) +{ + if (idlen > SSL_MAX_SSL_SESSION_ID_LENGTH) + idlen = SSL_MAX_SSL_SESSION_ID_LENGTH; + + /* We must ensure not to process more than what would fit in the + * destination buffer, including terminating NULL */ + if (idlen > (strsize-1) / 2) + idlen = (strsize-1) / 2; + + ap_bin2hex(id, idlen, str); + + return str; +} |