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-rw-r--r--modules/session/mod_session_crypto.c807
1 files changed, 807 insertions, 0 deletions
diff --git a/modules/session/mod_session_crypto.c b/modules/session/mod_session_crypto.c
new file mode 100644
index 0000000..fe39f2c
--- /dev/null
+++ b/modules/session/mod_session_crypto.c
@@ -0,0 +1,807 @@
+/* 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.
+ */
+
+#include "mod_session.h"
+#include "apu_version.h"
+#include "apr_base64.h" /* for apr_base64_decode et al */
+#include "apr_lib.h"
+#include "apr_md5.h"
+#include "apr_strings.h"
+#include "http_log.h"
+#include "http_core.h"
+
+#if APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION < 4
+
+#error session_crypto_module requires APU v1.4.0 or later
+
+#elif APU_HAVE_CRYPTO == 0
+
+#error Crypto support must be enabled in APR
+
+#else
+
+#include "apr_crypto.h" /* for apr_*_crypt et al */
+
+#define CRYPTO_KEY "session_crypto_context"
+
+module AP_MODULE_DECLARE_DATA session_crypto_module;
+
+/**
+ * Structure to carry the per-dir session config.
+ */
+typedef struct {
+ apr_array_header_t *passphrases;
+ int passphrases_set;
+ const char *cipher;
+ int cipher_set;
+} session_crypto_dir_conf;
+
+/**
+ * Structure to carry the server wide session config.
+ */
+typedef struct {
+ const char *library;
+ const char *params;
+ int library_set;
+} session_crypto_conf;
+
+/* Wrappers around apr_siphash24() and apr_crypto_equals(),
+ * available in APU-1.6/APR-2.0 only.
+ */
+#if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 6)
+
+#include "apr_siphash.h"
+
+#define AP_SIPHASH_DSIZE APR_SIPHASH_DSIZE
+#define AP_SIPHASH_KSIZE APR_SIPHASH_KSIZE
+#define ap_siphash24_auth apr_siphash24_auth
+
+#define ap_crypto_equals apr_crypto_equals
+
+#else
+
+#define AP_SIPHASH_DSIZE 8
+#define AP_SIPHASH_KSIZE 16
+
+#define ROTL64(x, n) (((x) << (n)) | ((x) >> (64 - (n))))
+
+#define U8TO64_LE(p) \
+ (((apr_uint64_t)((p)[0]) ) | \
+ ((apr_uint64_t)((p)[1]) << 8) | \
+ ((apr_uint64_t)((p)[2]) << 16) | \
+ ((apr_uint64_t)((p)[3]) << 24) | \
+ ((apr_uint64_t)((p)[4]) << 32) | \
+ ((apr_uint64_t)((p)[5]) << 40) | \
+ ((apr_uint64_t)((p)[6]) << 48) | \
+ ((apr_uint64_t)((p)[7]) << 56))
+
+#define U64TO8_LE(p, v) \
+do { \
+ (p)[0] = (unsigned char)((v) ); \
+ (p)[1] = (unsigned char)((v) >> 8); \
+ (p)[2] = (unsigned char)((v) >> 16); \
+ (p)[3] = (unsigned char)((v) >> 24); \
+ (p)[4] = (unsigned char)((v) >> 32); \
+ (p)[5] = (unsigned char)((v) >> 40); \
+ (p)[6] = (unsigned char)((v) >> 48); \
+ (p)[7] = (unsigned char)((v) >> 56); \
+} while (0)
+
+#define SIPROUND() \
+do { \
+ v0 += v1; v1=ROTL64(v1,13); v1 ^= v0; v0=ROTL64(v0,32); \
+ v2 += v3; v3=ROTL64(v3,16); v3 ^= v2; \
+ v0 += v3; v3=ROTL64(v3,21); v3 ^= v0; \
+ v2 += v1; v1=ROTL64(v1,17); v1 ^= v2; v2=ROTL64(v2,32); \
+} while(0)
+
+static apr_uint64_t ap_siphash24(const void *src, apr_size_t len,
+ const unsigned char key[AP_SIPHASH_KSIZE])
+{
+ const unsigned char *ptr, *end;
+ apr_uint64_t v0, v1, v2, v3, m;
+ apr_uint64_t k0, k1;
+ unsigned int rem;
+
+ k0 = U8TO64_LE(key + 0);
+ k1 = U8TO64_LE(key + 8);
+ v3 = k1 ^ (apr_uint64_t)0x7465646279746573ULL;
+ v2 = k0 ^ (apr_uint64_t)0x6c7967656e657261ULL;
+ v1 = k1 ^ (apr_uint64_t)0x646f72616e646f6dULL;
+ v0 = k0 ^ (apr_uint64_t)0x736f6d6570736575ULL;
+
+ rem = (unsigned int)(len & 0x7);
+ for (ptr = src, end = ptr + len - rem; ptr < end; ptr += 8) {
+ m = U8TO64_LE(ptr);
+ v3 ^= m;
+ SIPROUND();
+ SIPROUND();
+ v0 ^= m;
+ }
+ m = (apr_uint64_t)(len & 0xff) << 56;
+ switch (rem) {
+ case 7: m |= (apr_uint64_t)ptr[6] << 48;
+ case 6: m |= (apr_uint64_t)ptr[5] << 40;
+ case 5: m |= (apr_uint64_t)ptr[4] << 32;
+ case 4: m |= (apr_uint64_t)ptr[3] << 24;
+ case 3: m |= (apr_uint64_t)ptr[2] << 16;
+ case 2: m |= (apr_uint64_t)ptr[1] << 8;
+ case 1: m |= (apr_uint64_t)ptr[0];
+ case 0: break;
+ }
+ v3 ^= m;
+ SIPROUND();
+ SIPROUND();
+ v0 ^= m;
+
+ v2 ^= 0xff;
+ SIPROUND();
+ SIPROUND();
+ SIPROUND();
+ SIPROUND();
+
+ return v0 ^ v1 ^ v2 ^ v3;
+}
+
+static void ap_siphash24_auth(unsigned char out[AP_SIPHASH_DSIZE],
+ const void *src, apr_size_t len,
+ const unsigned char key[AP_SIPHASH_KSIZE])
+{
+ apr_uint64_t h;
+ h = ap_siphash24(src, len, key);
+ U64TO8_LE(out, h);
+}
+
+static int ap_crypto_equals(const void *buf1, const void *buf2,
+ apr_size_t size)
+{
+ const unsigned char *p1 = buf1;
+ const unsigned char *p2 = buf2;
+ unsigned char diff = 0;
+ apr_size_t i;
+
+ for (i = 0; i < size; ++i) {
+ diff |= p1[i] ^ p2[i];
+ }
+
+ return 1 & ((diff - 1) >> 8);
+}
+
+#endif
+
+static void compute_auth(const void *src, apr_size_t len,
+ const char *passphrase, apr_size_t passlen,
+ unsigned char auth[AP_SIPHASH_DSIZE])
+{
+ unsigned char key[APR_MD5_DIGESTSIZE];
+
+ /* XXX: if we had a way to get the raw bytes from an apr_crypto_key_t
+ * we could use them directly (not available in APR-1.5.x).
+ * MD5 is 128bit too, so use it to get a suitable siphash key
+ * from the passphrase.
+ */
+ apr_md5(key, passphrase, passlen);
+
+ ap_siphash24_auth(auth, src, len, key);
+}
+
+/**
+ * Initialise the encryption as per the current config.
+ *
+ * Returns APR_SUCCESS if successful.
+ */
+static apr_status_t crypt_init(request_rec *r,
+ const apr_crypto_t *f, apr_crypto_block_key_type_e **cipher,
+ session_crypto_dir_conf * dconf)
+{
+ apr_status_t res;
+ apr_hash_t *ciphers;
+
+ res = apr_crypto_get_block_key_types(&ciphers, f);
+ if (APR_SUCCESS != res) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01823)
+ "no ciphers returned by APR. "
+ "session encryption not possible");
+ return res;
+ }
+
+ *cipher = apr_hash_get(ciphers, dconf->cipher, APR_HASH_KEY_STRING);
+ if (!(*cipher)) {
+ apr_hash_index_t *hi;
+ const void *key;
+ apr_ssize_t klen;
+ int sum = 0;
+ int offset = 0;
+ char *options = NULL;
+
+ for (hi = apr_hash_first(r->pool, ciphers); hi; hi = apr_hash_next(hi)) {
+ apr_hash_this(hi, NULL, &klen, NULL);
+ sum += klen + 2;
+ }
+ for (hi = apr_hash_first(r->pool, ciphers); hi; hi = apr_hash_next(hi)) {
+ apr_hash_this(hi, &key, &klen, NULL);
+ if (!options) {
+ options = apr_palloc(r->pool, sum + 1);
+ }
+ else {
+ options[offset++] = ',';
+ options[offset++] = ' ';
+ }
+ strncpy(options + offset, key, klen);
+ offset += klen;
+ }
+ options[offset] = 0;
+
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01824)
+ "cipher '%s' not recognised by crypto driver. "
+ "session encryption not possible, options: %s", dconf->cipher, options);
+
+ return APR_EGENERAL;
+ }
+
+ return APR_SUCCESS;
+}
+
+/**
+ * Encrypt the string given as per the current config.
+ *
+ * Returns APR_SUCCESS if successful.
+ */
+static apr_status_t encrypt_string(request_rec * r, const apr_crypto_t *f,
+ session_crypto_dir_conf *dconf, const char *in, char **out)
+{
+ apr_status_t res;
+ apr_crypto_key_t *key = NULL;
+ apr_size_t ivSize = 0;
+ apr_crypto_block_t *block = NULL;
+ unsigned char *encrypt = NULL;
+ unsigned char *combined = NULL;
+ apr_size_t encryptlen, tlen, combinedlen;
+ char *base64;
+ apr_size_t blockSize = 0;
+ const unsigned char *iv = NULL;
+ apr_uuid_t salt;
+ apr_crypto_block_key_type_e *cipher;
+ const char *passphrase;
+ apr_size_t passlen;
+
+ /* use a uuid as a salt value, and prepend it to our result */
+ apr_uuid_get(&salt);
+ res = crypt_init(r, f, &cipher, dconf);
+ if (res != APR_SUCCESS) {
+ return res;
+ }
+
+ /* encrypt using the first passphrase in the list */
+ passphrase = APR_ARRAY_IDX(dconf->passphrases, 0, const char *);
+ passlen = strlen(passphrase);
+ res = apr_crypto_passphrase(&key, &ivSize, passphrase, passlen,
+ (unsigned char *) (&salt), sizeof(apr_uuid_t),
+ *cipher, APR_MODE_CBC, 1, 4096, f, r->pool);
+ if (APR_STATUS_IS_ENOKEY(res)) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01825)
+ "failure generating key from passphrase");
+ }
+ if (APR_STATUS_IS_EPADDING(res)) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01826)
+ "padding is not supported for cipher");
+ }
+ if (APR_STATUS_IS_EKEYTYPE(res)) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01827)
+ "the key type is not known");
+ }
+ if (APR_SUCCESS != res) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01828)
+ "encryption could not be configured.");
+ return res;
+ }
+
+ res = apr_crypto_block_encrypt_init(&block, &iv, key, &blockSize, r->pool);
+ if (APR_SUCCESS != res) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01829)
+ "apr_crypto_block_encrypt_init failed");
+ return res;
+ }
+
+ /* encrypt the given string */
+ res = apr_crypto_block_encrypt(&encrypt, &encryptlen,
+ (const unsigned char *)in, strlen(in),
+ block);
+ if (APR_SUCCESS != res) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01830)
+ "apr_crypto_block_encrypt failed");
+ return res;
+ }
+ res = apr_crypto_block_encrypt_finish(encrypt + encryptlen, &tlen, block);
+ if (APR_SUCCESS != res) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01831)
+ "apr_crypto_block_encrypt_finish failed");
+ return res;
+ }
+ encryptlen += tlen;
+
+ /* prepend the salt and the iv to the result (keep room for the MAC) */
+ combinedlen = AP_SIPHASH_DSIZE + sizeof(apr_uuid_t) + ivSize + encryptlen;
+ combined = apr_palloc(r->pool, combinedlen);
+ memcpy(combined + AP_SIPHASH_DSIZE, &salt, sizeof(apr_uuid_t));
+ memcpy(combined + AP_SIPHASH_DSIZE + sizeof(apr_uuid_t), iv, ivSize);
+ memcpy(combined + AP_SIPHASH_DSIZE + sizeof(apr_uuid_t) + ivSize,
+ encrypt, encryptlen);
+ /* authenticate the whole salt+IV+ciphertext with a leading MAC */
+ compute_auth(combined + AP_SIPHASH_DSIZE, combinedlen - AP_SIPHASH_DSIZE,
+ passphrase, passlen, combined);
+
+ /* base64 encode the result (APR handles the trailing '\0') */
+ base64 = apr_palloc(r->pool, apr_base64_encode_len(combinedlen));
+ apr_base64_encode(base64, (const char *) combined, combinedlen);
+ *out = base64;
+
+ return res;
+
+}
+
+/**
+ * Decrypt the string given as per the current config.
+ *
+ * Returns APR_SUCCESS if successful.
+ */
+static apr_status_t decrypt_string(request_rec * r, const apr_crypto_t *f,
+ session_crypto_dir_conf *dconf, const char *in, char **out)
+{
+ apr_status_t res;
+ apr_crypto_key_t *key = NULL;
+ apr_size_t ivSize = 0;
+ apr_crypto_block_t *block = NULL;
+ unsigned char *decrypted = NULL;
+ apr_size_t decryptedlen, tlen;
+ apr_size_t decodedlen;
+ char *decoded;
+ apr_size_t blockSize = 0;
+ apr_crypto_block_key_type_e *cipher;
+ unsigned char auth[AP_SIPHASH_DSIZE];
+ int i = 0;
+
+ /* strip base64 from the string */
+ decoded = apr_palloc(r->pool, apr_base64_decode_len(in));
+ decodedlen = apr_base64_decode(decoded, in);
+ decoded[decodedlen] = '\0';
+
+ /* sanity check - decoded too short? */
+ if (decodedlen < (AP_SIPHASH_DSIZE + sizeof(apr_uuid_t))) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, r, APLOGNO(10005)
+ "too short to decrypt, aborting");
+ return APR_ECRYPT;
+ }
+
+ res = crypt_init(r, f, &cipher, dconf);
+ if (res != APR_SUCCESS) {
+ return res;
+ }
+
+ res = APR_ECRYPT; /* in case we exhaust all passphrases */
+
+ /* try each passphrase in turn */
+ for (; i < dconf->passphrases->nelts; i++) {
+ const char *passphrase = APR_ARRAY_IDX(dconf->passphrases, i, char *);
+ apr_size_t passlen = strlen(passphrase);
+ apr_size_t len = decodedlen - AP_SIPHASH_DSIZE;
+ unsigned char *slider = (unsigned char *)decoded + AP_SIPHASH_DSIZE;
+
+ /* Verify authentication of the whole salt+IV+ciphertext by computing
+ * the MAC and comparing it (timing safe) with the one in the payload.
+ */
+ compute_auth(slider, len, passphrase, passlen, auth);
+ if (!ap_crypto_equals(auth, decoded, AP_SIPHASH_DSIZE)) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(10006)
+ "auth does not match, skipping");
+ continue;
+ }
+
+ /* encrypt using the first passphrase in the list */
+ res = apr_crypto_passphrase(&key, &ivSize, passphrase, passlen,
+ slider, sizeof(apr_uuid_t),
+ *cipher, APR_MODE_CBC, 1, 4096,
+ f, r->pool);
+ if (APR_STATUS_IS_ENOKEY(res)) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01832)
+ "failure generating key from passphrase");
+ continue;
+ }
+ else if (APR_STATUS_IS_EPADDING(res)) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01833)
+ "padding is not supported for cipher");
+ continue;
+ }
+ else if (APR_STATUS_IS_EKEYTYPE(res)) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01834)
+ "the key type is not known");
+ continue;
+ }
+ else if (APR_SUCCESS != res) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01835)
+ "encryption could not be configured.");
+ continue;
+ }
+
+ /* sanity check - decoded too short? */
+ if (len < (sizeof(apr_uuid_t) + ivSize)) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, r, APLOGNO(01836)
+ "too short to decrypt, skipping");
+ res = APR_ECRYPT;
+ continue;
+ }
+
+ /* bypass the salt at the start of the decoded block */
+ slider += sizeof(apr_uuid_t);
+ len -= sizeof(apr_uuid_t);
+
+ res = apr_crypto_block_decrypt_init(&block, &blockSize, slider, key,
+ r->pool);
+ if (APR_SUCCESS != res) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01837)
+ "apr_crypto_block_decrypt_init failed");
+ continue;
+ }
+
+ /* bypass the iv at the start of the decoded block */
+ slider += ivSize;
+ len -= ivSize;
+
+ /* decrypt the given string */
+ res = apr_crypto_block_decrypt(&decrypted, &decryptedlen,
+ slider, len, block);
+ if (res) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01838)
+ "apr_crypto_block_decrypt failed");
+ continue;
+ }
+ *out = (char *) decrypted;
+
+ res = apr_crypto_block_decrypt_finish(decrypted + decryptedlen, &tlen, block);
+ if (APR_SUCCESS != res) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01839)
+ "apr_crypto_block_decrypt_finish failed");
+ continue;
+ }
+ decryptedlen += tlen;
+ decrypted[decryptedlen] = 0;
+
+ break;
+ }
+
+ if (APR_SUCCESS != res) {
+ ap_log_rerror(APLOG_MARK, APLOG_INFO, res, r, APLOGNO(01840)
+ "decryption failed");
+ }
+
+ return res;
+
+}
+
+/**
+ * Crypto encoding for the session.
+ *
+ * @param r The request pointer.
+ * @param z A pointer to where the session will be written.
+ */
+static apr_status_t session_crypto_encode(request_rec * r, session_rec * z)
+{
+
+ char *encoded = NULL;
+ apr_status_t res;
+ const apr_crypto_t *f = NULL;
+ session_crypto_dir_conf *dconf = ap_get_module_config(r->per_dir_config,
+ &session_crypto_module);
+
+ if (dconf->passphrases_set && z->encoded && *z->encoded) {
+ apr_pool_userdata_get((void **)&f, CRYPTO_KEY, r->server->process->pconf);
+ res = encrypt_string(r, f, dconf, z->encoded, &encoded);
+ if (res != OK) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01841)
+ "encrypt session failed");
+ return res;
+ }
+ z->encoded = encoded;
+ }
+
+ return OK;
+
+}
+
+/**
+ * Crypto decoding for the session.
+ *
+ * @param r The request pointer.
+ * @param z A pointer to where the session will be written.
+ */
+static apr_status_t session_crypto_decode(request_rec * r,
+ session_rec * z)
+{
+
+ char *encoded = NULL;
+ apr_status_t res;
+ const apr_crypto_t *f = NULL;
+ session_crypto_dir_conf *dconf = ap_get_module_config(r->per_dir_config,
+ &session_crypto_module);
+
+ if ((dconf->passphrases_set) && z->encoded && *z->encoded) {
+ apr_pool_userdata_get((void **)&f, CRYPTO_KEY,
+ r->server->process->pconf);
+ res = decrypt_string(r, f, dconf, z->encoded, &encoded);
+ if (res != APR_SUCCESS) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01842)
+ "decrypt session failed, wrong passphrase?");
+ return res;
+ }
+ z->encoded = encoded;
+ }
+
+ return OK;
+
+}
+
+/**
+ * Initialise the SSL in the post_config hook.
+ */
+static int session_crypto_init(apr_pool_t *p, apr_pool_t *plog,
+ apr_pool_t *ptemp, server_rec *s)
+{
+ const apr_crypto_driver_t *driver = NULL;
+ apr_crypto_t *f = NULL;
+
+ session_crypto_conf *conf = ap_get_module_config(s->module_config,
+ &session_crypto_module);
+
+ /* session_crypto_init() will be called twice. Don't bother
+ * going through all of the initialization on the first call
+ * because it will just be thrown away.*/
+ if (ap_state_query(AP_SQ_MAIN_STATE) == AP_SQ_MS_CREATE_PRE_CONFIG) {
+ return OK;
+ }
+
+ if (conf->library) {
+
+ const apu_err_t *err = NULL;
+ apr_status_t rv;
+
+ rv = apr_crypto_init(p);
+ if (APR_SUCCESS != rv) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(01843)
+ "APR crypto could not be initialised");
+ return rv;
+ }
+
+ rv = apr_crypto_get_driver(&driver, conf->library, conf->params, &err, p);
+ if (APR_EREINIT == rv) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, rv, s, APLOGNO(01844)
+ "warning: crypto for '%s' was already initialised, "
+ "using existing configuration", conf->library);
+ rv = APR_SUCCESS;
+ }
+ if (APR_SUCCESS != rv && err) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(01845)
+ "The crypto library '%s' could not be loaded: %s (%s: %d)", conf->library, err->msg, err->reason, err->rc);
+ return rv;
+ }
+ if (APR_ENOTIMPL == rv) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(01846)
+ "The crypto library '%s' could not be found",
+ conf->library);
+ return rv;
+ }
+ if (APR_SUCCESS != rv || !driver) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(01847)
+ "The crypto library '%s' could not be loaded",
+ conf->library);
+ return rv;
+ }
+
+ rv = apr_crypto_make(&f, driver, conf->params, p);
+ if (APR_SUCCESS != rv) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(01848)
+ "The crypto library '%s' could not be initialised",
+ conf->library);
+ return rv;
+ }
+
+ ap_log_error(APLOG_MARK, APLOG_INFO, rv, s, APLOGNO(01849)
+ "The crypto library '%s' was loaded successfully",
+ conf->library);
+
+ apr_pool_userdata_set((const void *)f, CRYPTO_KEY,
+ apr_pool_cleanup_null, s->process->pconf);
+
+ }
+
+ return OK;
+}
+
+static void *create_session_crypto_config(apr_pool_t * p, server_rec *s)
+{
+ session_crypto_conf *new =
+ (session_crypto_conf *) apr_pcalloc(p, sizeof(session_crypto_conf));
+
+ /* if no library has been configured, set the recommended library
+ * as a sensible default.
+ */
+#ifdef APU_CRYPTO_RECOMMENDED_DRIVER
+ new->library = APU_CRYPTO_RECOMMENDED_DRIVER;
+#endif
+
+ return (void *) new;
+}
+
+static void *create_session_crypto_dir_config(apr_pool_t * p, char *dummy)
+{
+ session_crypto_dir_conf *new =
+ (session_crypto_dir_conf *) apr_pcalloc(p, sizeof(session_crypto_dir_conf));
+
+ new->passphrases = apr_array_make(p, 10, sizeof(char *));
+
+ /* default cipher AES256-SHA */
+ new->cipher = "aes256";
+
+ return (void *) new;
+}
+
+static void *merge_session_crypto_dir_config(apr_pool_t * p, void *basev, void *addv)
+{
+ session_crypto_dir_conf *new = (session_crypto_dir_conf *) apr_pcalloc(p, sizeof(session_crypto_dir_conf));
+ session_crypto_dir_conf *add = (session_crypto_dir_conf *) addv;
+ session_crypto_dir_conf *base = (session_crypto_dir_conf *) basev;
+
+ new->passphrases = (add->passphrases_set == 0) ? base->passphrases : add->passphrases;
+ new->passphrases_set = add->passphrases_set || base->passphrases_set;
+ new->cipher = (add->cipher_set == 0) ? base->cipher : add->cipher;
+ new->cipher_set = add->cipher_set || base->cipher_set;
+
+ return new;
+}
+
+static const char *set_crypto_driver(cmd_parms * cmd, void *config, const char *arg)
+{
+ session_crypto_conf *conf =
+ (session_crypto_conf *)ap_get_module_config(cmd->server->module_config,
+ &session_crypto_module);
+
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+
+ if (err != NULL) {
+ return err;
+ }
+
+ conf->library = ap_getword_conf(cmd->pool, &arg);
+ conf->params = arg;
+ conf->library_set = 1;
+
+ return NULL;
+}
+
+static const char *set_crypto_passphrase(cmd_parms * cmd, void *config, const char *arg)
+{
+ int arglen = strlen(arg);
+ char **argv;
+ char *result;
+ const char **passphrase;
+ session_crypto_dir_conf *dconf = (session_crypto_dir_conf *) config;
+
+ passphrase = apr_array_push(dconf->passphrases);
+
+ if ((arglen > 5) && strncmp(arg, "exec:", 5) == 0) {
+ if (apr_tokenize_to_argv(arg+5, &argv, cmd->temp_pool) != APR_SUCCESS) {
+ return apr_pstrcat(cmd->pool,
+ "Unable to parse exec arguments from ",
+ arg+5, NULL);
+ }
+ argv[0] = ap_server_root_relative(cmd->temp_pool, argv[0]);
+
+ if (!argv[0]) {
+ return apr_pstrcat(cmd->pool,
+ "Invalid SessionCryptoPassphrase exec location:",
+ arg+5, NULL);
+ }
+ result = ap_get_exec_line(cmd->pool,
+ (const char*)argv[0], (const char * const *)argv);
+
+ if(!result) {
+ return apr_pstrcat(cmd->pool,
+ "Unable to get bind password from exec of ",
+ arg+5, NULL);
+ }
+ *passphrase = result;
+ }
+ else {
+ *passphrase = arg;
+ }
+
+ dconf->passphrases_set = 1;
+
+ return NULL;
+}
+
+static const char *set_crypto_passphrase_file(cmd_parms *cmd, void *config,
+ const char *filename)
+{
+ char buffer[MAX_STRING_LEN];
+ char *arg;
+ const char *args;
+ ap_configfile_t *file;
+ apr_status_t rv;
+
+ filename = ap_server_root_relative(cmd->temp_pool, filename);
+ rv = ap_pcfg_openfile(&file, cmd->temp_pool, filename);
+ if (rv != APR_SUCCESS) {
+ return apr_psprintf(cmd->pool, "%s: Could not open file %s: %pm",
+ cmd->cmd->name, filename, &rv);
+ }
+
+ while (!(ap_cfg_getline(buffer, sizeof(buffer), file))) {
+ args = buffer;
+ while (*(arg = ap_getword_conf(cmd->pool, &args)) != '\0') {
+ if (*arg == '#') {
+ break;
+ }
+ set_crypto_passphrase(cmd, config, arg);
+ }
+ }
+
+ ap_cfg_closefile(file);
+
+ return NULL;
+}
+
+static const char *set_crypto_cipher(cmd_parms * cmd, void *config, const char *cipher)
+{
+ session_crypto_dir_conf *dconf = (session_crypto_dir_conf *) config;
+
+ dconf->cipher = cipher;
+ dconf->cipher_set = 1;
+
+ return NULL;
+}
+
+static const command_rec session_crypto_cmds[] =
+{
+ AP_INIT_ITERATE("SessionCryptoPassphrase", set_crypto_passphrase, NULL, RSRC_CONF|OR_AUTHCFG,
+ "The passphrase(s) used to encrypt the session. First will be used for encryption, all phrases will be accepted for decryption"),
+ AP_INIT_TAKE1("SessionCryptoPassphraseFile", set_crypto_passphrase_file, NULL, RSRC_CONF|ACCESS_CONF,
+ "File containing passphrase(s) used to encrypt the session, one per line. First will be used for encryption, all phrases will be accepted for decryption"),
+ AP_INIT_TAKE1("SessionCryptoCipher", set_crypto_cipher, NULL, RSRC_CONF|OR_AUTHCFG,
+ "The underlying crypto cipher to use"),
+ AP_INIT_RAW_ARGS("SessionCryptoDriver", set_crypto_driver, NULL, RSRC_CONF,
+ "The underlying crypto library driver to use"),
+ { NULL }
+};
+
+static void register_hooks(apr_pool_t * p)
+{
+ ap_hook_session_encode(session_crypto_encode, NULL, NULL, APR_HOOK_LAST);
+ ap_hook_session_decode(session_crypto_decode, NULL, NULL, APR_HOOK_FIRST);
+ ap_hook_post_config(session_crypto_init, NULL, NULL, APR_HOOK_LAST);
+}
+
+AP_DECLARE_MODULE(session_crypto) =
+{
+ STANDARD20_MODULE_STUFF,
+ create_session_crypto_dir_config, /* dir config creater */
+ merge_session_crypto_dir_config, /* dir merger --- default is to override */
+ create_session_crypto_config, /* server config */
+ NULL, /* merge server config */
+ session_crypto_cmds, /* command apr_table_t */
+ register_hooks /* register hooks */
+};
+
+#endif