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If SRTP sessions exist, don't create new ones when applying answer.

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Instead, call the "Update" methods of SrtpSession, which will just call
srtp_update, instead of wiping out the session state completely.

This was causing decryption to stop working when subsequent
offers/answers are applied. We don't know enough about SRTP to
understand the root cause, and I wasn't able to write an integration
test that reproduces the issue... But at least this fixes the bug that
can be reproduced reliably using Hangouts.

BUG=webrtc:8251

Review-Url: https://codereview.webrtc.org/3019443002
Cr-Commit-Position: refs/heads/master@{#19874}
This commit is contained in:
deadbeef 2017-09-15 17:52:36 -07:00 committed by Commit Bot
parent 1c5e6d0a3f
commit 5ada7acf60
1 changed files with 21 additions and 4 deletions
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25
pc/srtptransport.cc
View File

@ -174,25 +174,42 @@ bool SrtpTransport::SetRtpParams(int send_cs,
int recv_cs,
const uint8_t* recv_key,
int recv_key_len) {
CreateSrtpSessions();
// If parameters are being set for the first time, we should create new SRTP
// sessions and call "SetSend/SetRecv". Otherwise we should call
// "UpdateSend"/"UpdateRecv" on the existing sessions, which will internally
// call "srtp_update".
bool new_sessions = false;
if (!send_session_) {
RTC_DCHECK(!recv_session_);
CreateSrtpSessions();
new_sessions = true;
}
send_session_->SetEncryptedHeaderExtensionIds(
send_encrypted_header_extension_ids_);
if (external_auth_enabled_) {
send_session_->EnableExternalAuth();
}
if (!send_session_->SetSend(send_cs, send_key, send_key_len)) {
bool ret = new_sessions
? send_session_->SetSend(send_cs, send_key, send_key_len)
: send_session_->UpdateSend(send_cs, send_key, send_key_len);
if (!ret) {
ResetParams();
return false;
}
recv_session_->SetEncryptedHeaderExtensionIds(
recv_encrypted_header_extension_ids_);
if (!recv_session_->SetRecv(recv_cs, recv_key, recv_key_len)) {
ret = new_sessions
? recv_session_->SetRecv(recv_cs, recv_key, recv_key_len)
: recv_session_->UpdateRecv(recv_cs, recv_key, recv_key_len);
if (!ret) {
ResetParams();
return false;
}
LOG(LS_INFO) << "SRTP activated with negotiated parameters:"
LOG(LS_INFO) << "SRTP " << (new_sessions ? "updated" : "activated")
<< " with negotiated parameters:"
<< " send cipher_suite " << send_cs << " recv cipher_suite "
<< recv_cs;
return true;