From 4c8d86eb18e2fc8fcd5819a33599422454fdeff8 Mon Sep 17 00:00:00 2001 From: Hendrik Leppkes Date: Sun, 4 Oct 2015 14:48:49 +0200 Subject: [PATCH] avformat: implement SChannel SSP TLS protocol This implementation does not support TLS listen sockets and loading CA/Certs from files. The Windows API does not support loading PEM certs, and would either require a manual loader or instead be limited to loading Windows PFX certificates TLS listen sockets would have to be implemented quite separately, as many of the APIs are different for server-mode (as opposed to client mode). --- configure | 14 +- libavformat/Makefile | 1 + libavformat/allformats.c | 1 + libavformat/tls.h | 2 +- libavformat/tls_schannel.c | 600 +++++++++++++++++++++++++++++++++++++ 5 files changed, 614 insertions(+), 4 deletions(-) create mode 100644 libavformat/tls_schannel.c diff --git a/configure b/configure index d5e76de085..9a736ce2a4 100755 --- a/configure +++ b/configure @@ -281,6 +281,8 @@ External library support: --enable-opengl enable OpenGL rendering [no] --enable-openssl enable openssl, needed for https support if gnutls is not used [no] + --disable-schannel disable SChannel SSP, needed for TLS support on + Windows if openssl and gnutls are not used [autodetect] --disable-sdl disable sdl [autodetect] --disable-securetransport disable Secure Transport, needed for TLS support on OSX if openssl and gnutls are not used [autodetect] @@ -1468,6 +1470,7 @@ EXTERNAL_LIBRARY_LIST=" opencl opengl openssl + schannel sdl securetransport x11grab @@ -2763,13 +2766,15 @@ sctp_protocol_deps="struct_sctp_event_subscribe" sctp_protocol_select="network" srtp_protocol_select="rtp_protocol" tcp_protocol_select="network" -tls_gnutls_protocol_deps="gnutls !tls_securetransport_protocol" +tls_gnutls_protocol_deps="gnutls !tls_schannel_protocol !tls_securetransport_protocol" tls_gnutls_protocol_select="tcp_protocol" -tls_openssl_protocol_deps="openssl !tls_securetransport_protocol !tls_gnutls_protocol" +tls_openssl_protocol_deps="openssl !tls_schannel_protocol !tls_securetransport_protocol !tls_gnutls_protocol" tls_openssl_protocol_select="tcp_protocol" +tls_schannel_protocol_deps="schannel" +tls_schannel_protocol_select="tcp_protocol" tls_securetransport_protocol_deps="securetransport" tls_securetransport_protocol_select="tcp_protocol" -tls_protocol_deps_any="tls_securetransport_protocol tls_gnutls_protocol tls_openssl_protocol" +tls_protocol_deps_any="tls_schannel_protocol tls_securetransport_protocol tls_gnutls_protocol tls_openssl_protocol" udp_protocol_select="network" udplite_protocol_select="network" unix_protocol_deps="sys_un_h" @@ -5511,6 +5516,9 @@ disabled securetransport || { check_func SecIdentityCreate "-Wl,-framework,CoreF check_lib2 "Security/SecureTransport.h Security/Security.h" "SSLCreateContext SecItemImport" "-Wl,-framework,CoreFoundation -Wl,-framework,Security" && enable securetransport; } +disabled schannel || { check_func_headers "windows.h Security.h" InitializeSecurityContext -DSECURITY_WIN32 -lSecur32 && + enable schannel && add_extralibs -lSecur32; } + makeinfo --version > /dev/null 2>&1 && enable makeinfo || disable makeinfo enabled makeinfo \ && [ 0$(makeinfo --version | grep "texinfo" | sed 's/.*texinfo[^0-9]*\([0-9]*\)\..*/\1/') -ge 5 ] \ diff --git a/libavformat/Makefile b/libavformat/Makefile index 1a03e0c189..bdfe35c559 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -544,6 +544,7 @@ OBJS-$(CONFIG_SUBFILE_PROTOCOL) += subfile.o OBJS-$(CONFIG_TCP_PROTOCOL) += tcp.o OBJS-$(CONFIG_TLS_GNUTLS_PROTOCOL) += tls_gnutls.o tls.o OBJS-$(CONFIG_TLS_OPENSSL_PROTOCOL) += tls_openssl.o tls.o +OBJS-$(CONFIG_TLS_SCHANNEL_PROTOCOL) += tls_schannel.o tls.o OBJS-$(CONFIG_TLS_SECURETRANSPORT_PROTOCOL) += tls_securetransport.o tls.o OBJS-$(CONFIG_UDP_PROTOCOL) += udp.o OBJS-$(CONFIG_UDPLITE_PROTOCOL) += udp.o diff --git a/libavformat/allformats.c b/libavformat/allformats.c index 8b8d9f226a..73b1e4addd 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -395,6 +395,7 @@ void av_register_all(void) REGISTER_PROTOCOL(SRTP, srtp); REGISTER_PROTOCOL(SUBFILE, subfile); REGISTER_PROTOCOL(TCP, tcp); + REGISTER_PROTOCOL(TLS_SCHANNEL, tls_schannel); REGISTER_PROTOCOL(TLS_SECURETRANSPORT, tls_securetransport); REGISTER_PROTOCOL(TLS_GNUTLS, tls_gnutls); REGISTER_PROTOCOL(TLS_OPENSSL, tls_openssl); diff --git a/libavformat/tls.h b/libavformat/tls.h index 2a36f34f18..0326ef7924 100644 --- a/libavformat/tls.h +++ b/libavformat/tls.h @@ -26,7 +26,7 @@ #include "url.h" #include "libavutil/opt.h" -#define CONFIG_TLS_PROTOCOL (CONFIG_TLS_GNUTLS_PROTOCOL | CONFIG_TLS_OPENSSL_PROTOCOL | CONFIG_TLS_SECURETRANSPORT_PROTOCOL) +#define CONFIG_TLS_PROTOCOL (CONFIG_TLS_GNUTLS_PROTOCOL | CONFIG_TLS_OPENSSL_PROTOCOL | CONFIG_TLS_SECURETRANSPORT_PROTOCOL | CONFIG_TLS_SCHANNEL_PROTOCOL) typedef struct TLSShared { char *ca_file; diff --git a/libavformat/tls_schannel.c b/libavformat/tls_schannel.c new file mode 100644 index 0000000000..c76f8a9aa6 --- /dev/null +++ b/libavformat/tls_schannel.c @@ -0,0 +1,600 @@ +/* + * Copyright (c) 2015 Hendrik Leppkes + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** Based on the CURL SChannel module */ + +#include "avformat.h" +#include "internal.h" +#include "network.h" +#include "os_support.h" +#include "url.h" +#include "tls.h" + +#define SECURITY_WIN32 +#include +#include + +#define SCHANNEL_INITIAL_BUFFER_SIZE 4096 +#define SCHANNEL_FREE_BUFFER_SIZE 1024 + +/* mingw does not define this symbol */ +#ifndef SECBUFFER_ALERT +#define SECBUFFER_ALERT 17 +#endif + +typedef struct TLSContext { + const AVClass *class; + TLSShared tls_shared; + + CredHandle cred_handle; + TimeStamp cred_timestamp; + + CtxtHandle ctxt_handle; + TimeStamp ctxt_timestamp; + + ULONG request_flags; + ULONG context_flags; + + uint8_t *enc_buf; + int enc_buf_size; + int enc_buf_offset; + + uint8_t *dec_buf; + int dec_buf_size; + int dec_buf_offset; + + SecPkgContext_StreamSizes sizes; + + int connected; + int connection_closed; + int sspi_close_notify; +} TLSContext; + +static void init_sec_buffer(SecBuffer *buffer, unsigned long type, + void *data, unsigned long size) +{ + buffer->cbBuffer = size; + buffer->BufferType = type; + buffer->pvBuffer = data; +} + +static void init_sec_buffer_desc(SecBufferDesc *desc, SecBuffer *buffers, + unsigned long buffer_count) +{ + desc->ulVersion = SECBUFFER_VERSION; + desc->pBuffers = buffers; + desc->cBuffers = buffer_count; +} + +static int tls_shutdown_client(URLContext *h) +{ + TLSContext *c = h->priv_data; + TLSShared *s = &c->tls_shared; + int ret; + + if (c->connected) { + SecBufferDesc BuffDesc; + SecBuffer Buffer; + SECURITY_STATUS sspi_ret; + SecBuffer outbuf; + SecBufferDesc outbuf_desc; + + DWORD dwshut = SCHANNEL_SHUTDOWN; + init_sec_buffer(&Buffer, SECBUFFER_TOKEN, &dwshut, sizeof(dwshut)); + init_sec_buffer_desc(&BuffDesc, &Buffer, 1); + + sspi_ret = ApplyControlToken(&c->ctxt_handle, &BuffDesc); + if (sspi_ret != SEC_E_OK) + av_log(h, AV_LOG_ERROR, "ApplyControlToken failed\n"); + + init_sec_buffer(&outbuf, SECBUFFER_EMPTY, NULL, 0); + init_sec_buffer_desc(&outbuf_desc, &outbuf, 1); + + sspi_ret = InitializeSecurityContext(&c->cred_handle, &c->ctxt_handle, s->host, + c->request_flags, 0, 0, NULL, 0, &c->ctxt_handle, + &outbuf_desc, &c->context_flags, &c->ctxt_timestamp); + if (sspi_ret == SEC_E_OK || sspi_ret == SEC_I_CONTEXT_EXPIRED) { + ret = ffurl_write(s->tcp, outbuf.pvBuffer, outbuf.cbBuffer); + FreeContextBuffer(outbuf.pvBuffer); + if (ret < 0 || ret != outbuf.cbBuffer) + av_log(h, AV_LOG_ERROR, "Failed to send close message\n"); + } + + c->connected = 0; + } + return 0; +} + +static int tls_close(URLContext *h) +{ + TLSContext *c = h->priv_data; + + tls_shutdown_client(h); + + DeleteSecurityContext(&c->ctxt_handle); + FreeCredentialsHandle(&c->cred_handle); + + av_freep(&c->enc_buf); + c->enc_buf_size = c->enc_buf_offset = 0; + + av_freep(&c->dec_buf); + c->dec_buf_size = c->dec_buf_offset = 0; + + if (c->tls_shared.tcp) + ffurl_close(c->tls_shared.tcp); + return 0; +} + +static int tls_client_handshake_loop(URLContext *h, int initial) +{ + TLSContext *c = h->priv_data; + TLSShared *s = &c->tls_shared; + SECURITY_STATUS sspi_ret; + SecBuffer outbuf[3]; + SecBufferDesc outbuf_desc; + SecBuffer inbuf[2]; + SecBufferDesc inbuf_desc; + int i, ret = 0, read_data = initial; + + if (c->enc_buf == NULL) { + c->enc_buf_offset = 0; + ret = av_reallocp(&c->enc_buf, SCHANNEL_INITIAL_BUFFER_SIZE); + if (ret < 0) + goto fail; + c->enc_buf_size = SCHANNEL_INITIAL_BUFFER_SIZE; + } + + if (c->dec_buf == NULL) { + c->dec_buf_offset = 0; + ret = av_reallocp(&c->dec_buf, SCHANNEL_INITIAL_BUFFER_SIZE); + if (ret < 0) + goto fail; + c->dec_buf_size = SCHANNEL_INITIAL_BUFFER_SIZE; + } + + while (1) { + if (c->enc_buf_size - c->enc_buf_offset < SCHANNEL_FREE_BUFFER_SIZE) { + c->enc_buf_size = c->enc_buf_offset + SCHANNEL_FREE_BUFFER_SIZE; + ret = av_reallocp(&c->enc_buf, c->enc_buf_size); + if (ret < 0) { + c->enc_buf_size = c->enc_buf_offset = 0; + goto fail; + } + } + + if (read_data) { + ret = ffurl_read(c->tls_shared.tcp, c->enc_buf + c->enc_buf_offset, + c->enc_buf_size - c->enc_buf_offset); + if (ret < 0) { + av_log(h, AV_LOG_ERROR, "Failed to read handshake response\n"); + goto fail; + } + c->enc_buf_offset += ret; + } + + /* input buffers */ + init_sec_buffer(&inbuf[0], SECBUFFER_TOKEN, av_malloc(c->enc_buf_offset), c->enc_buf_offset); + init_sec_buffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0); + init_sec_buffer_desc(&inbuf_desc, inbuf, 2); + + if (inbuf[0].pvBuffer == NULL) { + av_log(h, AV_LOG_ERROR, "Failed to allocate input buffer\n"); + ret = AVERROR(ENOMEM); + goto fail; + } + + memcpy(inbuf[0].pvBuffer, c->enc_buf, c->enc_buf_offset); + + /* output buffers */ + init_sec_buffer(&outbuf[0], SECBUFFER_TOKEN, NULL, 0); + init_sec_buffer(&outbuf[1], SECBUFFER_ALERT, NULL, 0); + init_sec_buffer(&outbuf[2], SECBUFFER_EMPTY, NULL, 0); + init_sec_buffer_desc(&outbuf_desc, outbuf, 3); + + sspi_ret = InitializeSecurityContext(&c->cred_handle, &c->ctxt_handle, s->host, c->request_flags, + 0, 0, &inbuf_desc, 0, NULL, &outbuf_desc, &c->context_flags, + &c->ctxt_timestamp); + av_freep(&inbuf[0].pvBuffer); + + if (sspi_ret == SEC_E_INCOMPLETE_MESSAGE) { + av_log(h, AV_LOG_DEBUG, "Received incomplete handshake, need more data\n"); + read_data = 1; + continue; + } + + /* remote requests a client certificate - attempt to continue without one anyway */ + if (sspi_ret == SEC_I_INCOMPLETE_CREDENTIALS && + !(c->request_flags & ISC_REQ_USE_SUPPLIED_CREDS)) { + av_log(h, AV_LOG_VERBOSE, "Client certificate has been requested, ignoring\n"); + c->request_flags |= ISC_REQ_USE_SUPPLIED_CREDS; + read_data = 0; + continue; + } + + /* continue handshake */ + if (sspi_ret == SEC_I_CONTINUE_NEEDED || sspi_ret == SEC_E_OK) { + for (i = 0; i < 3; i++) { + if (outbuf[i].BufferType == SECBUFFER_TOKEN && outbuf[i].cbBuffer > 0) { + ret = ffurl_write(c->tls_shared.tcp, outbuf[i].pvBuffer, outbuf[i].cbBuffer); + if (ret < 0 || ret != outbuf[i].cbBuffer) { + av_log(h, AV_LOG_VERBOSE, "Failed to send handshake data\n"); + ret = AVERROR(EIO); + goto fail; + } + } + + if (outbuf[i].pvBuffer != NULL) { + FreeContextBuffer(outbuf[i].pvBuffer); + outbuf[i].pvBuffer = NULL; + } + } + } else { + if (sspi_ret == SEC_E_WRONG_PRINCIPAL) + av_log(h, AV_LOG_ERROR, "SNI or certificate check failed\n"); + else + av_log(h, AV_LOG_ERROR, "Creating security context failed (0x%lx)\n", sspi_ret); + ret = AVERROR_UNKNOWN; + goto fail; + } + + if (inbuf[1].BufferType == SECBUFFER_EXTRA && inbuf[1].cbBuffer > 0) { + if (c->enc_buf_offset > inbuf[1].cbBuffer) { + memmove(c->enc_buf, (c->enc_buf + c->enc_buf_offset) - inbuf[1].cbBuffer, + inbuf[1].cbBuffer); + c->enc_buf_offset = inbuf[1].cbBuffer; + if (sspi_ret == SEC_I_CONTINUE_NEEDED) { + read_data = 0; + continue; + } + } + } else { + c->enc_buf_offset = 0; + } + + if (sspi_ret == SEC_I_CONTINUE_NEEDED) { + read_data = 1; + continue; + } + + break; + } + + return 0; + +fail: + /* free any remaining output data */ + for (i = 0; i < 3; i++) { + if (outbuf[i].pvBuffer != NULL) { + FreeContextBuffer(outbuf[i].pvBuffer); + outbuf[i].pvBuffer = NULL; + } + } + + return ret; +} + +static int tls_client_handshake(URLContext *h) +{ + TLSContext *c = h->priv_data; + TLSShared *s = &c->tls_shared; + SecBuffer outbuf; + SecBufferDesc outbuf_desc; + SECURITY_STATUS sspi_ret; + int ret; + + init_sec_buffer(&outbuf, SECBUFFER_EMPTY, NULL, 0); + init_sec_buffer_desc(&outbuf_desc, &outbuf, 1); + + c->request_flags = ISC_REQ_SEQUENCE_DETECT | ISC_REQ_REPLAY_DETECT | + ISC_REQ_CONFIDENTIALITY | ISC_REQ_ALLOCATE_MEMORY | + ISC_REQ_STREAM; + + sspi_ret = InitializeSecurityContext(&c->cred_handle, NULL, s->host, c->request_flags, 0, 0, + NULL, 0, &c->ctxt_handle, &outbuf_desc, &c->context_flags, + &c->ctxt_timestamp); + if (sspi_ret != SEC_I_CONTINUE_NEEDED) { + av_log(h, AV_LOG_ERROR, "Unable to create initial security context (0x%lx)\n", sspi_ret); + ret = AVERROR_UNKNOWN; + goto fail; + } + + ret = ffurl_write(s->tcp, outbuf.pvBuffer, outbuf.cbBuffer); + FreeContextBuffer(outbuf.pvBuffer); + if (ret < 0 || ret != outbuf.cbBuffer) { + av_log(h, AV_LOG_ERROR, "Failed to send initial handshake data\n"); + ret = AVERROR(EIO); + goto fail; + } + + return tls_client_handshake_loop(h, 1); + +fail: + DeleteSecurityContext(&c->ctxt_handle); + return ret; +} + +static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options) +{ + TLSContext *c = h->priv_data; + TLSShared *s = &c->tls_shared; + SECURITY_STATUS sspi_ret; + SCHANNEL_CRED schannel_cred = { 0 }; + int ret; + + if ((ret = ff_tls_open_underlying(s, h, uri, options)) < 0) + goto fail; + + if (s->listen) { + av_log(h, AV_LOG_ERROR, "TLS Listen Sockets with SChannel is not implemented.\n"); + ret = AVERROR(EINVAL); + goto fail; + } + + /* SChannel Options */ + schannel_cred.dwVersion = SCHANNEL_CRED_VERSION; + + if (s->verify) + schannel_cred.dwFlags = SCH_CRED_AUTO_CRED_VALIDATION | + SCH_CRED_REVOCATION_CHECK_CHAIN; + else + schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION | + SCH_CRED_IGNORE_NO_REVOCATION_CHECK | + SCH_CRED_IGNORE_REVOCATION_OFFLINE; + + /* Get credential handle */ + sspi_ret = AcquireCredentialsHandle(NULL, (TCHAR *)UNISP_NAME, SECPKG_CRED_OUTBOUND, + NULL, &schannel_cred, NULL, NULL, &c->cred_handle, + &c->cred_timestamp); + if (sspi_ret != SEC_E_OK) { + av_log(h, AV_LOG_ERROR, "Unable to acquire security credentials (0x%lx)\n", sspi_ret); + ret = AVERROR_UNKNOWN; + goto fail; + } + + ret = tls_client_handshake(h); + if (ret < 0) + goto fail; + + c->connected = 1; + + return 0; + +fail: + tls_close(h); + return ret; +} + +static int tls_read(URLContext *h, uint8_t *buf, int len) +{ + TLSContext *c = h->priv_data; + TLSShared *s = &c->tls_shared; + SECURITY_STATUS sspi_ret = SEC_E_OK; + SecBuffer inbuf[4]; + SecBufferDesc inbuf_desc; + int size, ret; + int min_enc_buf_size = len + SCHANNEL_FREE_BUFFER_SIZE; + + if (len <= c->dec_buf_offset) + goto cleanup; + + if (c->sspi_close_notify) + goto cleanup; + + if (!c->connection_closed) { + size = c->enc_buf_size - c->enc_buf_offset; + if (size < SCHANNEL_FREE_BUFFER_SIZE || c->enc_buf_size < min_enc_buf_size) { + c->enc_buf_size = c->enc_buf_offset + SCHANNEL_FREE_BUFFER_SIZE; + if (c->enc_buf_size < min_enc_buf_size) + c->enc_buf_size = min_enc_buf_size; + ret = av_reallocp(&c->enc_buf, c->enc_buf_size); + if (ret < 0) { + c->enc_buf_size = c->enc_buf_offset = 0; + return ret; + } + } + + ret = ffurl_read(s->tcp, c->enc_buf + c->enc_buf_offset, + c->enc_buf_size - c->enc_buf_offset); + if (ret < 0) { + av_log(h, AV_LOG_ERROR, "Unable to read from socket\n"); + return ret; + } else if (ret == 0) + c->connection_closed = 1; + + c->enc_buf_offset += ret; + } + + while (c->enc_buf_offset > 0 && sspi_ret == SEC_E_OK && c->dec_buf_offset < len) { + /* input buffer */ + init_sec_buffer(&inbuf[0], SECBUFFER_DATA, c->enc_buf, c->enc_buf_offset); + + /* additional buffers for possible output */ + init_sec_buffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0); + init_sec_buffer(&inbuf[2], SECBUFFER_EMPTY, NULL, 0); + init_sec_buffer(&inbuf[3], SECBUFFER_EMPTY, NULL, 0); + init_sec_buffer_desc(&inbuf_desc, inbuf, 4); + + sspi_ret = DecryptMessage(&c->ctxt_handle, &inbuf_desc, 0, NULL); + if (sspi_ret == SEC_E_OK || sspi_ret == SEC_I_RENEGOTIATE || + sspi_ret == SEC_I_CONTEXT_EXPIRED) { + /* handle decrypted data */ + if (inbuf[1].BufferType == SECBUFFER_DATA) { + /* grow buffer if needed */ + size = inbuf[1].cbBuffer > SCHANNEL_FREE_BUFFER_SIZE ? + inbuf[1].cbBuffer : SCHANNEL_FREE_BUFFER_SIZE; + if (c->dec_buf_size - c->dec_buf_offset < size || c->dec_buf_size < len) { + c->dec_buf_size = c->dec_buf_offset + size; + if (c->dec_buf_size < len) + c->dec_buf_size = len; + ret = av_reallocp(&c->dec_buf, c->dec_buf_size); + if (ret < 0) { + c->dec_buf_size = c->dec_buf_offset = 0; + return ret; + } + } + + /* copy decrypted data to buffer */ + size = inbuf[1].cbBuffer; + if (size) { + memcpy(c->dec_buf + c->dec_buf_offset, inbuf[1].pvBuffer, size); + c->dec_buf_offset += size; + } + } + if (inbuf[3].BufferType == SECBUFFER_EXTRA && inbuf[3].cbBuffer > 0) { + if (c->enc_buf_offset > inbuf[3].cbBuffer) { + memmove(c->enc_buf, (c->enc_buf + c->enc_buf_offset) - inbuf[3].cbBuffer, + inbuf[3].cbBuffer); + c->enc_buf_offset = inbuf[3].cbBuffer; + } + } else + c->enc_buf_offset = 0; + + if (sspi_ret == SEC_I_RENEGOTIATE) { + if (c->enc_buf_offset) { + av_log(h, AV_LOG_ERROR, "Cannot renegotiate, encrypted data buffer not empty\n"); + ret = AVERROR_UNKNOWN; + goto cleanup; + } + + av_log(h, AV_LOG_VERBOSE, "Re-negotiating security context\n"); + ret = tls_client_handshake_loop(h, 0); + if (ret < 0) { + goto cleanup; + } + sspi_ret = SEC_E_OK; + continue; + } else if (sspi_ret == SEC_I_CONTEXT_EXPIRED) { + c->sspi_close_notify = 1; + if (!c->connection_closed) { + c->connection_closed = 1; + av_log(h, AV_LOG_VERBOSE, "Server closed the connection\n"); + } + ret = 0; + goto cleanup; + } + } else if (sspi_ret == SEC_E_INCOMPLETE_MESSAGE) { + ret = AVERROR(EAGAIN); + goto cleanup; + } else { + av_log(h, AV_LOG_ERROR, "Unable to decrypt message\n"); + ret = AVERROR(EIO); + goto cleanup; + } + } + + ret = 0; + +cleanup: + size = FFMIN(len, c->dec_buf_offset); + if (size) { + memcpy(buf, c->dec_buf, size); + memmove(c->dec_buf, c->dec_buf + size, c->dec_buf_offset - size); + c->dec_buf_offset -= size; + + return size; + } + + if (ret == 0 && !c->connection_closed) + ret = AVERROR(EAGAIN); + + return ret < 0 ? ret : 0; +} + +static int tls_write(URLContext *h, const uint8_t *buf, int len) +{ + TLSContext *c = h->priv_data; + TLSShared *s = &c->tls_shared; + SECURITY_STATUS sspi_ret; + int ret = 0, data_size; + uint8_t *data = NULL; + SecBuffer outbuf[4]; + SecBufferDesc outbuf_desc; + + if (c->sizes.cbMaximumMessage == 0) { + sspi_ret = QueryContextAttributes(&c->ctxt_handle, SECPKG_ATTR_STREAM_SIZES, &c->sizes); + if (sspi_ret != SEC_E_OK) + return AVERROR_UNKNOWN; + } + + /* limit how much data we can consume */ + len = FFMIN(len, c->sizes.cbMaximumMessage); + + data_size = c->sizes.cbHeader + len + c->sizes.cbTrailer; + data = av_malloc(data_size); + if (data == NULL) + return AVERROR(ENOMEM); + + init_sec_buffer(&outbuf[0], SECBUFFER_STREAM_HEADER, + data, c->sizes.cbHeader); + init_sec_buffer(&outbuf[1], SECBUFFER_DATA, + data + c->sizes.cbHeader, len); + init_sec_buffer(&outbuf[2], SECBUFFER_STREAM_TRAILER, + data + c->sizes.cbHeader + len, + c->sizes.cbTrailer); + init_sec_buffer(&outbuf[3], SECBUFFER_EMPTY, NULL, 0); + init_sec_buffer_desc(&outbuf_desc, outbuf, 4); + + memcpy(outbuf[1].pvBuffer, buf, len); + + sspi_ret = EncryptMessage(&c->ctxt_handle, 0, &outbuf_desc, 0); + if (sspi_ret == SEC_E_OK) { + len = outbuf[0].cbBuffer + outbuf[1].cbBuffer + outbuf[2].cbBuffer; + ret = ffurl_write(s->tcp, data, len); + if (ret < 0 || ret != len) { + ret = AVERROR(EIO); + av_log(h, AV_LOG_ERROR, "Writing encrypted data to socket failed\n"); + goto done; + } + } else { + av_log(h, AV_LOG_ERROR, "Encrypting data failed\n"); + if (sspi_ret == SEC_E_INSUFFICIENT_MEMORY) + ret = AVERROR(ENOMEM); + else + ret = AVERROR(EIO); + goto done; + } + +done: + av_freep(&data); + return ret < 0 ? ret : outbuf[1].cbBuffer; +} + +static const AVOption options[] = { + TLS_COMMON_OPTIONS(TLSContext, tls_shared), + { NULL } +}; + +static const AVClass tls_class = { + .class_name = "tls", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +URLProtocol ff_tls_schannel_protocol = { + .name = "tls", + .url_open2 = tls_open, + .url_read = tls_read, + .url_write = tls_write, + .url_close = tls_close, + .priv_data_size = sizeof(TLSContext), + .flags = URL_PROTOCOL_FLAG_NETWORK, + .priv_data_class = &tls_class, +};