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rtpp_dtls.c
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rtpp_dtls.c
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#include <err.h>
#include <net/if.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include "rtpp_defines.h"
#include "rtpp_srtp.h"
#include "rtpp_dtls.h"
#include "rtpp_util.h"
#include "rtpp_session.h"
#include "rtpp_command.h"
#define DEBUG_DTLS
//#define DEBUG_DTLS_SETUP
//#define NO_LOG
#ifdef NO_LOG
#define dtls_log(level, handle, format, ...)
#else
#define dtls_log(level, handle, format, ...) rtpp_log_write(level, handle, format, __VA_ARGS__)
#endif
extern rtpp_log_t glog;
const char * default_srtp_profile = "SRTP_AES128_CM_SHA1_80";
const char * dtls_srtp_export_label = "EXTRACTOR-dtls_srtp";
/* Global Variable stre the DTLS context */
dtls_context dtls_ctx;
struct srtp_cipher_map_entry srtp_cipher_map[] = {
{1, "SRTP_AES128_CM_SHA1_80"},
{2, "SRTP_AES128_CM_SHA1_32"},
{0, NULL}
};
/* id callback */
unsigned long id_f()
{
return getpid();
}
const char *dtls_state_str(int state)
{
switch (state)
{
case DTLS_STATE_NONE:
return "DTLS_STATE_NONE";
case DTLS_STATE_INIT_FAILED:
return "DTLS_STATE_INIT_FAILED";
case DTLS_STATE_INIT_DONE:
return "DTLS_STATE_INIT_DONE";
case DTLS_STATE_ACCEPTING:
return "DTLS_STATE_ACCEPTING";
case DTLS_STATE_CONNECTING:
return "DTLS_STATE_CONNECTING";
case DTLS_STATE_ESTABLISHED:
return "DTLS_STATE_ESTABLISHED";
case DTLS_STATE_CLOSED:
return "DTLS_STATE_CLOSED";
}
return "NONE";
}
const char *dtls_attr_str(int attr)
{
switch (attr)
{
case RTPP_DTLS_ATTR_NONE:
return "DTLS_ATTR_NONE";
case RTPP_DTLS_ATTR_SETUP_ACTIVE:
return "RTPP_DTLS_ATTR_SETUP_ACTIVE";
case RTPP_DTLS_ATTR_SETUP_PASSIVE:
return "RTPP_DTLS_ATTR_SETUP_PASSIVE";
case RTPP_DTLS_ATTR_SETUP_ACTPASS:
return "RTPP_DTLS_ATTR_SETUP_ACTPASS";
case RTPP_DTLS_ATTR_SETUP_HOLDCONN:
return "RTPP_DTLS_ATTR_SETUP_HOLDCONN";
}
return "NONE";
}
void dtls_report_error(SSL* ssl, int result)
{
if (result <= 0)
{
int error = SSL_get_error(ssl, result);
switch (error)
{
case SSL_ERROR_ZERO_RETURN:
rtpp_log_write(RTPP_LOG_INFO, glog,"SSL_ERROR_ZERO_RETURN" );
break;
case SSL_ERROR_NONE:
rtpp_log_write(RTPP_LOG_INFO, glog,"SSL_ERROR_NONE" );
break;
case SSL_ERROR_WANT_READ:
rtpp_log_write(RTPP_LOG_INFO, glog,"SSL_ERROR_WANT_READ" );
break;
default:
rtpp_log_write(RTPP_LOG_INFO, glog,"Error: %d", error );
break;
}
}
}
bool dtls_verify_digest(rtpp_stream* st, const X509 *cert)
{
unsigned char digest[EVP_MAX_MD_SIZE];
size_t digest_length;
if (compute_digest(cert, st->remote_fp_algorithm,
digest, sizeof(digest), &digest_length))
{
#ifdef DEBUG_DTLS
char *fp = NULL;
fp_to_hex(digest,digest_length,&fp);
rtpp_log_write(RTPP_LOG_INFO, glog,"fingerprint recvd [%s] \n", fp);
free(fp);
fp = NULL;
fp_to_hex((const unsigned char *)st->remote_fp_value,st->remote_fp_len,&fp);
rtpp_log_write(RTPP_LOG_INFO, glog,"fingerprint from the command [%s] \n", fp);
free(fp);
rtpp_log_write(RTPP_LOG_INFO, glog,"fingerprint digest_len:%d remote cmd len:%d \n",
digest_length, st->remote_fp_len );
#endif
if (strncmp((const char *)digest, (const char *)st->remote_fp_value,
min(digest_length,st->remote_fp_len)) != 0)
{
rtpp_log_write(RTPP_LOG_INFO, glog,"fingerprint verification failed st:%p fd:%d ssl:%\n",st, st->fd, st->ssl);
return false;
}
return true;
}
rtpp_log_write(RTPP_LOG_INFO, glog,"fingerprint verification compute_digest failed st:%p fd:%d ssl:%\n",st, st->fd, st->ssl);
return false;
}
/* Call Backs */
int dtls_verify_cb(int ok, X509_STORE_CTX* store) {
SSL *ssl = (SSL*)X509_STORE_CTX_get_ex_data(store, SSL_get_ex_data_X509_STORE_CTX_idx());
rtpp_stream *st = (rtpp_stream*)SSL_get_app_data(ssl);
int depth = X509_STORE_CTX_get_error_depth(store);
X509* cert = X509_STORE_CTX_get_current_cert(store);
int override = 1;
char buf[512];
int err = X509_STORE_CTX_get_error(store);
bzero(buf, 512);
X509_NAME_oneline(X509_get_subject_name(cert),buf,sizeof(buf));
rtpp_log_write(RTPP_LOG_INFO, glog, "depth[%d] subject = %s\n", depth, buf);
bzero(buf, 512);
X509_NAME_oneline(X509_get_issuer_name(cert),buf,sizeof(buf));
rtpp_log_write(RTPP_LOG_INFO, glog, "depth[%d] issuer = %s\n", depth, buf);
rtpp_log_write(RTPP_LOG_INFO, glog, "verify error:ok=%d num=%d:%s\n", ok,err, X509_verify_cert_error_string(err));
rtpp_log_write(RTPP_LOG_INFO, glog, "depth:%d, error code is %d\n", depth,store->error);
switch (err)
{
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
rtpp_log_write(RTPP_LOG_INFO, glog, "issuer= %s\n",buf);
break;
case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
case X509_V_ERR_CERT_NOT_YET_VALID:
rtpp_log_write(RTPP_LOG_INFO, glog, "notBefore\n");
break;
case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
case X509_V_ERR_CERT_HAS_EXPIRED:
rtpp_log_write(RTPP_LOG_INFO, glog, "notAfter\n");
break;
case X509_V_ERR_CERT_SIGNATURE_FAILURE:
case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
rtpp_log_write(RTPP_LOG_INFO, glog, "unable to decrypt cert signature\n");
break;
case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
rtpp_log_write(RTPP_LOG_INFO, glog, "Critical Extension\n");
break;
case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
rtpp_log_write(RTPP_LOG_INFO, glog, "unable to decode issuer public key\n");
break;
case X509_V_ERR_OUT_OF_MEM:
rtpp_log_write(RTPP_LOG_ERR, glog, "Out of memory \n");
break;
case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
if (st->remote_fp_algorithm && st->remote_fp_value)
{
ok = 1;
rtpp_log_write(RTPP_LOG_INFO, glog,"{%d}fingerprint verification st:%p fd:%d ssl:%p\n",depth, st, st->fd, ssl);
if(!dtls_verify_digest(st,cert))
{
//override = 0;/* should be Zero*/
ok = 0;
}
}
rtpp_log_write(RTPP_LOG_INFO, glog, "Self signed certificate issue\n");
break;
case X509_V_ERR_CERT_REVOKED:
rtpp_log_write(RTPP_LOG_INFO, glog, "certitifcate revoked\n");
break;
case X509_V_ERR_INVALID_CA:
rtpp_log_write(RTPP_LOG_INFO, glog, "invalid CA\n");
break;
case X509_V_ERR_PATH_LENGTH_EXCEEDED:
rtpp_log_write(RTPP_LOG_INFO, glog, "path length exceeded\n");
break;
case X509_V_ERR_INVALID_PURPOSE:
rtpp_log_write(RTPP_LOG_INFO, glog, "invalid purpose\n");
break;
case X509_V_ERR_CERT_UNTRUSTED:
case X509_V_ERR_CERT_REJECTED:
rtpp_log_write(RTPP_LOG_INFO, glog, "certificate untrusted/rejected\n");
break;
default:
rtpp_log_write(RTPP_LOG_INFO, glog, "default: error code is %d (check x509_vfy.h)\n", store->error);
break;
}
if (!ok)
{
if (override)
{
rtpp_log_write(RTPP_LOG_INFO, glog, "something wrong with the cert[%d]!!! error code:%d (x509_vfy.h) Ignoring for Now\n",depth, store->error);
ok=1;
}
else
rtpp_log_write(RTPP_LOG_INFO, glog, "verify error:num=%d:%s depth:%d\n", err, X509_verify_cert_error_string(err),depth);
}
rtpp_log_write(RTPP_LOG_INFO, glog, "verify return:%d\n", ok);
return ok;
}
int dtls_generate_cookie_cb(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len)
{
unsigned char *buffer, result[EVP_MAX_MD_SIZE];
unsigned int length = 0, resultlength;
struct sockaddr *peer;
rtpp_stream *st = (rtpp_stream*)SSL_get_app_data(ssl);
rtpp_log_write(RTPP_LOG_INFO, glog," st:%p ssl:%p fd:%d\n",st,ssl,st->fd);
peer = *(st->addr);
/* Initialize a random secret */
if (!st->cookie_initialized)
{
if (!RAND_bytes(st->cookie_secret, COOKIE_SECRET_LENGTH))
{
rtpp_log_write(RTPP_LOG_INFO, glog,"error setting random cookie secret\n");
return 0;
}
st->cookie_initialized = 1;
}
rtpp_log_write(RTPP_LOG_INFO, glog,"peer addr:%s :%d\n",
addr2char(sstosa(peer)), addr2port(sstosa(peer)));
/* Create buffer with peer's address and port */
length = 0;
switch (peer->sa_family)
{
case AF_INET:
length += sizeof(struct in_addr);
break;
case AF_INET6:
length += sizeof(struct in6_addr);
break;
default:
OPENSSL_assert(0);
break;
}
length += sizeof(in_port_t);
buffer = (unsigned char*) OPENSSL_malloc(length);
if (buffer == NULL)
{
rtpp_log_write(RTPP_LOG_INFO, glog,"out of memory\n");
return 0;
}
switch (peer->sa_family)
{
case AF_INET:
memcpy(buffer,
&satosin(peer)->sin_port,
sizeof(in_port_t));
memcpy(buffer + sizeof(in_port_t),
&satosin(peer)->sin_addr,
sizeof(struct in_addr));
break;
case AF_INET6:
memcpy(buffer,
&satosin6(peer)->sin6_port,
sizeof(in_port_t));
memcpy(buffer + sizeof(in_port_t),
&satosin6(peer)->sin6_addr,
sizeof(struct in6_addr));
break;
default:
OPENSSL_assert(0);
break;
}
/* Calculate HMAC of buffer using the secret */
HMAC(EVP_sha1(), (const void*) st->cookie_secret, COOKIE_SECRET_LENGTH,
(const unsigned char*) buffer, length, result, &resultlength);
OPENSSL_free(buffer);
memcpy(cookie, result, resultlength);
*cookie_len = resultlength;
return 1;
}
int dtls_verify_cookie_cb(SSL *ssl, unsigned char *cookie, unsigned int cookie_len)
{
unsigned char *buffer, result[EVP_MAX_MD_SIZE];
unsigned int length = 0, resultlength;
struct sockaddr *peer;
rtpp_stream *st = (rtpp_stream*)SSL_get_app_data(ssl);
/* If secret isn't initialized yet, the cookie can't be valid */
if (!st->cookie_initialized)
return 0;
rtpp_log_write(RTPP_LOG_INFO, glog," st:%p ssl:%p fd:%d\n",st,ssl,st->fd);
if (*(st->addr) == NULL)
return 0;
peer = *(st->addr);
rtpp_log_write(RTPP_LOG_INFO, glog," peer addr:%s :%d\n",
addr2char(sstosa(peer)), addr2port(sstosa(peer)));
//memcpy(&peer,*(st->addr),sizeof(peer));
/* Create buffer with peer's address and port */
length = 0;
switch (peer->sa_family)
{
case AF_INET:
length += sizeof(struct in_addr);
break;
case AF_INET6:
length += sizeof(struct in6_addr);
break;
default:
OPENSSL_assert(0);
break;
}
length += sizeof(in_port_t);
buffer = (unsigned char*) OPENSSL_malloc(length);
if (buffer == NULL)
{
rtpp_log_write(RTPP_LOG_INFO, glog,"out of memory\n");
return 0;
}
switch (peer->sa_family)
{
case AF_INET:
memcpy(buffer,
&satosin(peer)->sin_port,
sizeof(in_port_t));
memcpy(buffer + sizeof(in_port_t),
&satosin(peer)->sin_addr,
sizeof(struct in_addr));
break;
case AF_INET6:
memcpy(buffer,
&satosin6(peer)->sin6_port,
sizeof(in_port_t));
memcpy(buffer + sizeof(in_port_t),
&satosin6(peer)->sin6_addr,
sizeof(struct in6_addr));
break;
default:
OPENSSL_assert(0);
break;
}
/* Calculate HMAC of buffer using the secret */
HMAC(EVP_sha1(), (const void*) st->cookie_secret, COOKIE_SECRET_LENGTH,
(const unsigned char*) buffer, length, result, &resultlength);
OPENSSL_free(buffer);
if (cookie_len == resultlength && memcmp(result, cookie, resultlength) == 0)
{
rtpp_log_write(RTPP_LOG_INFO, glog,"Verified Cookie\n");
return 1;
}
rtpp_log_write(RTPP_LOG_INFO, glog,"Verify Cookie Failed\n");
return 0;
}
/* End Call Backs */
bool dtls_get_srtp_cipher(rtpp_stream *st, int16_t *suite) {
SRTP_PROTECTION_PROFILE *srtp_profile = SSL_get_selected_srtp_profile(st->ssl);
if (!srtp_profile)
return false;
rtpp_log_write(RTPP_LOG_INFO, glog, "get suite %s\n",srtp_profile->name);
for (srtp_cipher_map_entry *entry = srtp_cipher_map; entry->srtp_profile_name; ++entry)
{
if (!strcmp(entry->srtp_profile_name, srtp_profile->name))
{
*suite = entry->suite;
rtpp_log_write(RTPP_LOG_INFO, glog, "get suite: %d\n",*suite);
return true;
}
}
return false;
}
int dtls_setup_srtp_session_keys(rtpp_stream *st)
{
//TODO: probably an exception candidate
unsigned char material[SRTP_MASTER_KEY_LEN << 1];
size_t offset, s_offset, c_offset;
int ret = 0;
int16_t suite = 0;
rtpp_session *sp = NULL;
if (!dtls_get_srtp_cipher(st,&st->suite))
rtpp_log_write(RTPP_LOG_INFO, glog," Failed to get the suite\n", sp,st->idx,suite);
suite = st->suite;
#if 0
srtp_profile_t profile = st->suite;
int key_len = srtp_profile_get_master_key_length(profile);
int salt_len = srtp_profile_get_master_salt_length(profile);
#endif
if (!SSL_export_keying_material(
st->ssl,
material,
sizeof(material),
"EXTRACTOR-dtls_srtp", 19, NULL, 0, 0))
{
rtpp_log_write(RTPP_LOG_INFO, glog," SRTP KEY Export Failed st:%p\n", st);
return 0;
}
offset = s_offset = c_offset = 0;
bzero(st->snd_key,SRTP_MAX_KEY_LEN);
bzero(st->rcv_key,SRTP_MAX_KEY_LEN);
offset = 0;
memcpy(&st->snd_key[c_offset], &material[offset], SRTP_MASTER_KEY_KEY_LEN);
offset += SRTP_MASTER_KEY_KEY_LEN;
c_offset += SRTP_MASTER_KEY_KEY_LEN;
memcpy(&st->rcv_key[s_offset], &material[offset], SRTP_MASTER_KEY_KEY_LEN);
offset += SRTP_MASTER_KEY_KEY_LEN;
s_offset += SRTP_MASTER_KEY_KEY_LEN;
memcpy(&st->snd_key[c_offset], &material[offset], SRTP_MASTER_KEY_SALT_LEN);
offset += SRTP_MASTER_KEY_SALT_LEN;
c_offset += SRTP_MASTER_KEY_SALT_LEN;
memcpy(&st->rcv_key[s_offset], &material[offset], SRTP_MASTER_KEY_SALT_LEN);
offset += SRTP_MASTER_KEY_SALT_LEN;
s_offset += SRTP_MASTER_KEY_SALT_LEN;
rtpp_log_write(RTPP_LOG_INFO, glog," offset:%d c_offset:%d client key:%s\n",
offset,c_offset,srtpw_octet_string_hex_string(st->snd_key,SRTP_MASTER_KEY_LEN));
rtpp_log_write(RTPP_LOG_INFO, glog," offset:%d s_offset:%d server key:%s\n",
offset,s_offset,srtpw_octet_string_hex_string(st->rcv_key,SRTP_MASTER_KEY_LEN));
sp = (rtpp_session *)st->sp;
if (!sp)
return 0;
strcpy((char *)st->snd_key,srtpw_octet_string_hex_string(st->snd_key,SRTP_MASTER_KEY_LEN));
strcpy((char *)st->rcv_key,srtpw_octet_string_hex_string(st->rcv_key,SRTP_MASTER_KEY_LEN));
rtpp_log_write(RTPP_LOG_INFO, glog," Creating srtp context sp:%p idx:%d suite:%d\n", sp,st->idx,suite);
rtpp_log_write(RTPP_LOG_INFO, glog," Creating srtp context snd_key:%s rcv_key:%s\n",st->snd_key, st->rcv_key);
if (rtpp_srtp_validate_key(st->rcv_key) || rtpp_srtp_validate_key(st->snd_key))
{
rtpp_log_write(RTPP_LOG_INFO, glog,"SRTP hex Key Validation Failed\n");
}
ret = rtpp_srtp_create_context(sp, st->idx, st->snd_key, suite, st->snd_ssrc, st->fix_srtp_seq, 1);
ret &= rtpp_srtp_create_context(sp, st->idx, st->rcv_key, suite, st->rcv_ssrc, st->fix_srtp_seq, 0);
if (!ret)
return 0;
sp->dtls_pending = false;
sp->secure = 1;
return 1;
}
int dtls_setup_srtp_keys(rtpp_stream *st)
{
dtls_setup_srtp_session_keys(st);
return 0;
}
void dtls_init_stream(rtpp_stream *st, int fd, struct sockaddr **addr)
{
memset(st, 0, sizeof(rtpp_stream));
st->fd = fd;
st->addr = addr;
st->state = DTLS_STATE_NONE;
st->event = 0;
}
void rtpp_dtls_free_stream(rtpp_stream* st)
{
if (st->remote_fp_value != NULL)
{
free(st->remote_fp_value);
}
if (st->local_fp_value != NULL)
{
free(st->local_fp_value);
}
if (st->ssl != NULL)
{
SSL_free(st->ssl);
}
st->state = DTLS_STATE_CLOSED;
st->ssl = NULL;
st->ctx = NULL;
/* Local Identity is stored in config so don't delete it*/
st->local_identity = NULL;
st->local_fp_value = NULL;
st->remote_fp_value = NULL;
}
bool dtls_set_fingerprint(rtpp_stream *st, int digest_algo,
unsigned char *digest, size_t digest_len, bool local)
{
char *fp = NULL;
char fp_len =0;
//rtpp_log_write(RTPP_LOG_INFO, glog,"0 %s_fingerprint:%s fp_len:%d len:%d\n",local?"L":"R",digest, fp_len,(digest_len+1)/3);
if (!digest_algo || digest == NULL || !digest_len )
return false;
//sp->stream[kidx]->local_fp_value = strdup((const char *)local_fp);
fp_len= hex_to_fp(digest, digest_len, &fp);
//sp->stream[kidx]->state = DTLS_STATE_OFFERED;
rtpp_log_write(RTPP_LOG_INFO, glog,"00 %s_fingerprint:%s fp_len:%d len:%d\n",local?"L":"R",digest, fp_len,(digest_len+1)/3);
if (fp == NULL)
return false;
if (local)
{
RTPP_DTLS_FREE(st->local_fp_value);
st->local_fp_value = fp;
st->local_fp_len = fp_len;
st->local_fp_algorithm = digest_algo;
}
else
{
//TODO: compare the previous value of
// remote finger print to start DTLS nego again.
RTPP_DTLS_FREE(st->remote_fp_value);
st->remote_fp_value = fp;
st->remote_fp_len = fp_len;
st->remote_fp_algorithm = digest_algo;
}
//st->state = DTLS_STATE_ACCEPTED;
return 0;
}
#define dtls_set_remote_fingerprint(st,algo,digest,digest_len) dtls_set_fingerprint(st,algo,digest,digest_len, 0)
#define dtls_set_local_fingerprint(st,algo,digest,digest_len) dtls_set_fingerprint(st,algo,digest,digest_len, 1)
SSL_CTX *get_dtls_context(dtls_context *dtls_ctx, rtpp_stream *st) {
SSL_CTX *ctx = NULL;
if (st->snd_attr == RTPP_DTLS_ATTR_SETUP_ACTIVE)
{// TODO:: method version check DTLSV1.0 or DTLSV1.2
ctx = dtls_ctx->client_ctx;
// TODO ? set to expect our own certificate from peer
}
else
{
ctx = dtls_ctx->server_ctx;
}
if (ctx == NULL)
return NULL;
return ctx;
}
int dtls_init_ssl_parameters(rtpp_stream *st)
{
BIO *bio_rd, *bio_wr;
SSL_CTX *ctx =NULL;
SSL *ssl = NULL;
int verify;
bio_rd = bio_wr = NULL;
if (!st || !st->ctx)
return -1;
ctx = st->ctx;
ssl = SSL_new(ctx);
if (!ssl)
return -1;
rtpp_log_write(RTPP_LOG_INFO, glog,"0 st:%p fd:%d ssl:%p init_ssl_parameters \n",st, st->fd, ssl);
/* set up the memory-buffer BIOs */
bio_rd = BIO_new(BIO_s_mem());
if (!bio_rd)
return -1;
bio_wr = BIO_new(BIO_s_mem());
if (!bio_wr)
return -1;
BIO_set_nbio(bio_rd,1);
BIO_set_nbio(bio_wr,1);
BIO_set_mem_eof_return(bio_rd, -1);
BIO_set_mem_eof_return(bio_wr, -1);
/* bind them together */
SSL_set_bio(ssl, bio_rd, bio_wr);
/* if on the client: SSL_set_connect_state(con); */
SSL_set_options(ssl, SSL_OP_COOKIE_EXCHANGE);
//SSL_set_mode(st->ssl, SSL_MODE_ENABLE_PARTIAL_WRITE|SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
//SSL_set_options(ssl, SSL_OP_NO_QUERY_MTU);
//SSL_set_mtu(ssl, 1472);
//
//dtls_cfg.dtls_rekey;
verify = dtls_ctx.verify?(SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT):SSL_VERIFY_NONE;
SSL_set_verify(ssl, verify, NULL);
// SSL_set_verify(ssl, SSL_VERIFY_PEER, NULL);
//SSL_set_verify(ssl, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);
st->suite = dtls_ctx.srtp_suite;
rtpp_log_write(RTPP_LOG_INFO, glog,"verify:%d suite:%d rekey:%d\n",verify, st->suite,dtls_ctx.dtls_rekey);
if (st->snd_attr == RTPP_DTLS_ATTR_SETUP_ACTIVE)
{
SSL_set_connect_state(ssl);
}
else
{
SSL_set_accept_state(ssl);
}
st->ssl = ssl;
/* store stream stucture in the SSL context */
SSL_set_app_data(ssl, st);
return 0;
}
int dtls_init(rtpp_stream *st)
{
int rc= 0;
if (st->state == DTLS_STATE_CLOSED)
goto init_done;
if (st->state != DTLS_STATE_NONE )
return 1;
if (dtls_ctx.init_failed)
{
st->init_failed = true;
st->state = DTLS_STATE_INIT_FAILED;
rtpp_log_write(RTPP_LOG_INFO, glog,"dtls context Init failed,so returning st:%p\n",st);
return 0;
}
rtpp_log_write(RTPP_LOG_INFO, glog,"Init dtls context for st:%p\n",st);
st->ctx = get_dtls_context(&dtls_ctx,st);
if (!st->ctx)
{
rtpp_log_write(RTPP_LOG_INFO, glog,"get_dtls_context failed\n");
st->init_failed = true;
st->state = DTLS_STATE_INIT_FAILED;
return 0;
}
rc = dtls_init_ssl_parameters(st);
if (rc)
{
rtpp_log_write(RTPP_LOG_INFO, glog,"dtls_init_ssl_parameters failed\n");
st->init_failed = true;
st->state = DTLS_STATE_INIT_FAILED;
return 0;
}
init_done:
st->state = DTLS_STATE_INIT_DONE;
st->init_failed = false;
st->client_hello_retran_cnt = 0;
rtpp_log_write(RTPP_LOG_INFO, glog,"Init dtls stream for st:%p\n",st);
return 1;
}
int dtls_start_client_handshake(rtpp_stream *st)
{
int r = 0;
int err = 0;
SSL * ssl = NULL;
if (!st || !st->ssl)
return 0;
ssl = st->ssl;
rtpp_log_write(RTPP_LOG_INFO, glog," Start Client Handshake\n");
r=SSL_do_handshake(ssl);
st->state = DTLS_STATE_CONNECTING;
st->client_hello_retran_cnt++;
// Now handle handshake errors */
switch (err=SSL_get_error(ssl,r))
{
case SSL_ERROR_NONE:
rtpp_log_write(RTPP_LOG_INFO, glog,"Start Handshake Done\n");
break;
case SSL_ERROR_WANT_READ:
// There are two cases here:
// (1) We didn't get enough data. In this case we leave the
// timers alone and wait for more packets.
// (2) We did get a full flight and then handled it, but then
// wrote some more message and now we need to flush them
// to the network and now reset the timers
//
// If data was written then this means we got a complete
// something or a retransmit so we need to reset the timer
rtpp_log_write(RTPP_LOG_INFO, glog," Handshake WANT READ\n");
break;
case SSL_ERROR_WANT_WRITE:
rtpp_log_write(RTPP_LOG_INFO, glog," Handshake WANT WRITE %d\n",err);
break;
default:
rtpp_log_write(RTPP_LOG_INFO, glog," Handshake ERROR %d\n", err);
// Note: need to fall through to propagate alerts, if any
return 0;
break;
}
return 1;
}
int dtls_process_pending_bytes(rtpp_stream *st)
{
char buf[BUFSIZE]="\0";
BIO *bio_wr = NULL;
char *pbuf = buf;
struct sockaddr_in *to;
if (!st->ssl)
return -1;
bio_wr = SSL_get_wbio(st->ssl);
if (!bio_wr)
return -1;
while (1)
{
size_t pending = BIO_ctrl_pending(bio_wr);
if (pending > 0)
{
bzero(buf,BUFSIZE);
rtpp_log_write(RTPP_LOG_INFO, glog,"BIO_ctrl_pending(bio_wr) == %d (max buf:%d)\n" , pending,BUFSIZE );
// BIO_read() attempts to read len bytes from BIO b and places the data in buf.
int bytes_to_send = BIO_read(bio_wr, (void*)pbuf, sizeof(buf) > pending ? pending : sizeof(buf));
if (bytes_to_send > 0)
{
rtpp_log_write(RTPP_LOG_INFO, glog,"BIO_read(bio_wr) == %d\n", bytes_to_send );
int sent = 0;
while (1)
{
to = (struct sockaddr_in *)*(st->addr);
rtpp_log_write(RTPP_LOG_INFO, glog,"dtls udp send %d encoded bytes to fd:%d %s:%d\n", bytes_to_send,st->fd, (char *)inet_ntoa(to->sin_addr), ntohs(to->sin_port));
int rc = sendto(st->fd, pbuf+sent, bytes_to_send, 0, *(st->addr), SA_LEN(*(st->addr)));
if (rc == -1)
{
rtpp_log_write(RTPP_LOG_INFO, glog,"sendto == %d failed\n", rc );
break;
}
else
{
rtpp_log_write(RTPP_LOG_INFO, glog,"sendto == %d success\n", rc );
sent += rc;
bytes_to_send -= rc;
if (bytes_to_send == 0)
break;
}
}
}
else if (!BIO_should_retry(bio_wr))
{// BIO_should_retry() is true if the call that produced this condition should then be retried at a later time.
dtls_report_error(st->ssl, bytes_to_send);
}
}
else
{
rtpp_log_write(RTPP_LOG_INFO, glog,"BIO_ctrl_pending(bio_wr) == 0\n" );
break;
}
}
return 0;
}
bool dtls_shutdown(rtpp_stream *st, int pending)
{
if (!st->ssl) return 0;
SSL_shutdown(st->ssl);
if (pending)
dtls_process_pending_bytes(st);
SSL_clear(st->ssl);
st->state = DTLS_STATE_CLOSED;
return true;
}
int dtls_start_client(rtpp_stream *st)
{
int ret =0;
if (!st || st->init_failed)
return 0;
rtpp_log_write(RTPP_LOG_INFO, glog,"st:%p dtls state:%s snd_attr:%s rcv_attr:%s\n",st,
dtls_state_str(st->state), dtls_attr_str(st->snd_attr),dtls_attr_str(st->rcv_attr));
/* Client Hello Count to send client hello two times */
//if (st->state > DTLS_STATE_CONNECTING || (st->client_hello_count >= 2 && st->state != DTLS_STATE_INIT_DONE) || st->snd_attr != RTPP_DTLS_ATTR_SETUP_ACTIVE)
//if (st->client_hello_retran_cnt >= CLIENT_HELLO_MAX_RETRANS || st->state >= DTLS_STATE_ESTABLISHED || st->snd_attr != RTPP_DTLS_ATTR_SETUP_ACTIVE)
if (st->state != DTLS_STATE_INIT_DONE || st->snd_attr != RTPP_DTLS_ATTR_SETUP_ACTIVE)
{
//rtpp_log_write(RTPP_LOG_INFO, glog,"dtls_start_client started/failed\n");
return 0;
}
ret = dtls_start_client_handshake(st);
if (!ret)
{
rtpp_log_write(RTPP_LOG_INFO, glog,"dtls_start_client_handshake failed\n");
return 0;
}
//st->client_hello_count++;
return dtls_process_pending_bytes(st);
}
int dtls_do_retransmission(rtpp_stream *st)
{
if (!st || !st->ssl || (st->state != DTLS_STATE_ACCEPTING && st->state != DTLS_STATE_CONNECTING) )
return 0;
if ((SSL_version(st->ssl) == DTLS1_VERSION) && DTLSv1_handle_timeout(st->ssl) > 0)
{
rtpp_log_write(RTPP_LOG_INFO, glog,"DTLS Timeout Occured (%p)\n", st);
return dtls_process_pending_bytes(st);
}
return 0;
}
int dtls_process_dtls_msg(rtpp_stream *st, char *buf, int size)
{
BIO *bio_rd = NULL;
int r, w = 0;
if (!st || !st->ssl || !buf || !size || st->init_failed)
{
rtpp_log_write(RTPP_LOG_INFO, glog,"Failed stream:%p ssl:%p buf:%p size:%d init:%d\n",
DPRINT(st),DPRINT(st->ssl),DPRINT(buf),size,st?st->init_failed:0);
return -1;
}
rtpp_log_write(RTPP_LOG_INFO, glog,"Recvd %d bytes dtls state:%s snd_attr:%s\n",
size,dtls_state_str(st->state), dtls_attr_str(st->snd_attr));
if (st->snd_attr == RTPP_DTLS_ATTR_SETUP_PASSIVE && st->state == DTLS_STATE_INIT_DONE)
st->state = DTLS_STATE_ACCEPTING;
bio_rd = SSL_get_rbio(st->ssl);
if (!bio_rd)
return -1;
if (size > 0)
{
w = BIO_write(bio_rd, buf, size);
rtpp_log_write(RTPP_LOG_INFO, glog,"BIO_write %d bytes\n", w);
while (1)
{
r = SSL_read(st->ssl, buf, BUFSIZE);
if (r > 0)
{
rtpp_log_write(RTPP_LOG_INFO, glog,"SSL_read received %d bytes %s\n",r, buf );
}
else
{
if (SSL_want_read(st->ssl))
{
rtpp_log_write(RTPP_LOG_INFO, glog, "SSL_want_read \n");
}
else
{
dtls_report_error(st->ssl, r);
if (SSL_get_error(st->ssl, r) == SSL_ERROR_ZERO_RETURN)
{
rtpp_log_write(RTPP_LOG_INFO, glog,"dtls session closed \n");
dtls_shutdown(st, 0);
goto send_pending;
}
rtpp_log_write(RTPP_LOG_INFO, glog,"dtls udp received %d Error bytes SSL_read\n",r );
break;
}
rtpp_log_write(RTPP_LOG_INFO, glog,"Handshake finished? state:%d\n",st->state);
if (st->state != DTLS_STATE_ESTABLISHED && SSL_is_init_finished(st->ssl))
{
rtpp_session *sp = (rtpp_session *)st->sp;
rtpp_log_write(RTPP_LOG_INFO, glog,"Handshake has been finished sp:%p st:%p\n",sp, st);
if (sp && sp->drop_rtp_packets == RTPP_DTLS_DROP_RTP)
sp->drop_rtp_packets = 0;
dtls_setup_srtp_keys(st);
st->state = DTLS_STATE_ESTABLISHED;
}
break;
}
}
}
else if (size==0)
{
rtpp_log_write(RTPP_LOG_INFO, glog," connection closed" );
return -1;
}
send_pending:
dtls_process_pending_bytes(st);
return 0;
}
bool dtls_close(rtpp_stream *st) {
rtpp_dtls_free_stream(st);
return true;
}
SSL_CTX *dtls_create_ssl_context(dtls_context *dtls_ctx, dtls_versions dtls_version, int client)
{
SSL_CTX *ctx = NULL;
if (client)
ctx = SSL_CTX_new(dtls_ctx->dtls_method[dtls_version].client);
else
ctx = SSL_CTX_new(dtls_ctx->dtls_method[dtls_version].server);
if (ctx == NULL)
return NULL;
if (client)
SSL_CTX_add_client_CA(ctx, dtls_ctx->identity->certificate);
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, dtls_verify_cb);
SSL_CTX_set_verify_depth(ctx, 4);
SSL_CTX_set_cipher_list(ctx, "ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH");
if (SSL_CTX_set_tlsext_use_srtp(ctx, default_srtp_profile))
{
SSL_CTX_free(ctx);
return NULL;
}
if (dtls_ctx->identity != NULL && !configure_ctx_identity(ctx, dtls_ctx->identity))
{
return NULL;
}
SSL_CTX_set_cookie_generate_cb(ctx, dtls_generate_cookie_cb);
SSL_CTX_set_cookie_verify_cb(ctx, dtls_verify_cookie_cb);
SSL_CTX_set_read_ahead(ctx, 1);
return ctx;
}
void dtls_init_ssl_methods(dtls_context *dtls_ctx)
{
dtls_ctx->dtls_method[M_DTLS_V1_0].server = DTLSv1_server_method();
dtls_ctx->dtls_method[M_DTLS_V1_0].client = DTLSv1_client_method();
#if 0
dtls_ctx->dtls_method[M_DTLS_V1_2].server = DTLSv1_2_server_method();
dtls_ctx->dtls_method[M_DTLS_V1_2].client = DTLSv1_2_client_method();
#endif
}
int init_dtls_context(dtls_context *dtls_ctx, dtls_versions dtls_version)
{
bzero(dtls_ctx,sizeof(dtls_context));
// setup DTLS identity
// TODO: use a random string as common name
dtls_ctx->identity = generate_ssl_identity("rtpproxy");
dtls_init_ssl_methods(dtls_ctx);
if ((dtls_ctx->client_ctx = dtls_create_ssl_context(dtls_ctx, dtls_version, 1)) == NULL)
{
rtpp_log_write(RTPP_LOG_ERR, glog,"dtls client context create failed \n");
return -1;
}
if ((dtls_ctx->server_ctx = dtls_create_ssl_context(dtls_ctx, dtls_version, 0)) == NULL)
{
rtpp_log_write(RTPP_LOG_ERR, glog,"dtls server context create failed \n");
SSL_CTX_free(dtls_ctx->client_ctx);
return -1;
}