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Switch to cipher-block-chaining, add a magic byte sequence to check for sucessful decryption and fix some null termination issues 

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@13868 d0543943-73ff-0310-b7d9-9358b9ac24b2
This commit is contained in:
Andrew Thompson 2009-06-19 17:47:09 +00:00
parent b068f8e7b8
commit 1688e31e6a
2 changed files with 33 additions and 10 deletions
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3
src/mod/event_handlers/mod_event_multicast/Makefile
View File

@ -1,5 +1,6 @@
LOCAL_CFLAGS= $(OPENSSL_CFLAGS)
LOCAL_CFLAGS= $(OPENSSL_CFLAGS) -DHAVE_OPENSSL
LOCAL_LDLAGS= $(OPENSSL_LIBS)
CONFIG_HEADER = $(top_builddir)/src/include/switch_private.h
include ../../../../build/modmake.rules

40
src/mod/event_handlers/mod_event_multicast/mod_event_multicast.c
View File

@ -36,6 +36,8 @@
#define MULTICAST_BUFFSIZE 65536
/* magic byte sequence */
static unsigned char MAGIC[] = {226, 132, 177, 197, 152, 198, 142, 211, 172, 197, 158, 208, 169, 208, 135, 197, 166, 207, 154, 196, 166};
static char *MARKER = "1";
SWITCH_MODULE_LOAD_FUNCTION(mod_event_multicast_load);
@ -205,11 +207,12 @@ static void event_handler(switch_event_t *event)
switch_uuid_get(&uuid);
switch_uuid_format(uuid_str, &uuid);
len = strlen(packet) + sizeof(globals.host_hash) + SWITCH_UUID_FORMATTED_LENGTH + EVP_MAX_IV_LENGTH;
len = strlen(packet) + sizeof(globals.host_hash) + SWITCH_UUID_FORMATTED_LENGTH + EVP_MAX_IV_LENGTH + strlen((char*)MAGIC);
#else
len = strlen(packet) + sizeof(globals.host_hash);
len = strlen(packet) + sizeof(globals.host_hash) + strlen((char*) MAGIC);
#endif
buf = malloc(len + 1);
bzero(buf, len + 1);
switch_assert(buf);
memcpy(buf, &globals.host_hash, sizeof(globals.host_hash));
@ -218,17 +221,22 @@ static void event_handler(switch_event_t *event)
switch_copy_string(buf + sizeof(globals.host_hash), uuid_str, SWITCH_UUID_FORMATTED_LENGTH);
EVP_CIPHER_CTX_init(&ctx);
EVP_EncryptInit(&ctx, EVP_bf_cfb(), NULL, NULL);
EVP_EncryptInit(&ctx, EVP_bf_cbc(), NULL, NULL);
EVP_CIPHER_CTX_set_key_length(&ctx, strlen(globals.psk));
EVP_EncryptInit(&ctx, NULL, (unsigned char*) globals.psk, (unsigned char*) uuid_str);
EVP_EncryptUpdate(&ctx, (unsigned char*) buf + sizeof(globals.host_hash) + SWITCH_UUID_FORMATTED_LENGTH,
&outlen, (unsigned char*) packet, (int) strlen(packet));
EVP_EncryptUpdate(&ctx, (unsigned char*) buf + sizeof(globals.host_hash) + SWITCH_UUID_FORMATTED_LENGTH + outlen,
&tmplen, (unsigned char*) MAGIC, (int) strlen((char *) MAGIC));
outlen += tmplen;
EVP_EncryptFinal(&ctx, (unsigned char*) buf + sizeof(globals.host_hash) + SWITCH_UUID_FORMATTED_LENGTH + outlen, &tmplen);
outlen += tmplen;
len = (size_t) outlen + sizeof(globals.host_hash) + SWITCH_UUID_FORMATTED_LENGTH;
*(buf + sizeof(globals.host_hash) + SWITCH_UUID_FORMATTED_LENGTH + outlen) = '\0';
} else {
#endif
switch_copy_string(buf + sizeof(globals.host_hash), packet, len - sizeof(globals.host_hash));
switch_copy_string(buf + sizeof(globals.host_hash) + strlen(packet), (char *) MAGIC, strlen((char*) MAGIC)+1);
#ifdef HAVE_OPENSSL
}
#endif
@ -246,7 +254,6 @@ static void event_handler(switch_event_t *event)
SWITCH_MODULE_LOAD_FUNCTION(mod_event_multicast_load)
{
memset(&globals, 0, sizeof(globals));
module_pool = pool;
@ -340,7 +347,7 @@ SWITCH_MODULE_SHUTDOWN_FUNCTION(mod_event_multicast_shutdown)
SWITCH_MODULE_RUNTIME_FUNCTION(mod_event_multicast_runtime)
{
switch_event_t *local_event;
char *buf;
char *buf, *m;
switch_sockaddr_t *addr;
buf = (char *) malloc(MULTICAST_BUFFSIZE);
@ -384,26 +391,41 @@ SWITCH_MODULE_RUNTIME_FUNCTION(mod_event_multicast_runtime)
tmp = malloc(len);
memset(tmp, 0, len);
bzero(tmp, len);
switch_copy_string(uuid_str, packet, SWITCH_UUID_FORMATTED_LENGTH);
packet += SWITCH_UUID_FORMATTED_LENGTH;
EVP_CIPHER_CTX_init(&ctx);
EVP_DecryptInit(&ctx, EVP_bf_cfb(), NULL, NULL);
EVP_DecryptInit(&ctx, EVP_bf_cbc(), NULL, NULL);
EVP_CIPHER_CTX_set_key_length(&ctx, strlen(globals.psk));
EVP_DecryptInit(&ctx, NULL, (unsigned char*) globals.psk, (unsigned char*) uuid_str);
EVP_DecryptUpdate(&ctx, (unsigned char*) tmp,
&outl, (unsigned char*) packet, (int) len);
EVP_DecryptFinal(&ctx, (unsigned char*) tmp + outl, &tmplen);
*(tmp + outl + tmplen) = '\0';
/*switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "decrypted event as %s\n----------\n of actual length %d (%d) %d\n", tmp, outl + tmplen, (int) len, (int) strlen(tmp));*/
/*continue;*/
packet = tmp;
}
#endif
//switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "\nEVENT %d\n--------------------------------\n%s\n", (int) len, packet);
if ((m = strchr(packet, (int) MAGIC[0])) != 0) {
/*switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Found start of magic string\n");*/
if (!strncmp((char*) MAGIC, m, strlen((char*) MAGIC))) {
/*switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Found entire magic string\n");*/
*m = '\0';
} else {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Failed to find entire magic string\n");
continue;
}
} else {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_WARNING, "Failed to find start of magic string\n");
continue;
}
/*switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "\nEVENT %d\n--------------------------------\n%s\n", (int) len, packet);*/
if (switch_event_create_subclass(&local_event, SWITCH_EVENT_CUSTOM, MULTICAST_EVENT) == SWITCH_STATUS_SUCCESS) {
char *var, *val, *term = NULL, tmpname[128];
switch_event_add_header_string(local_event, SWITCH_STACK_BOTTOM, "Multicast", "yes");