Add TLS/SSL backend: Windows Schannel (#3867)

.github/workflows/ci-win.yml

@@ -178,25 +178,10 @@ jobs:
         msbuild pjproject-vs14.sln /p:PlatformToolset=v143 /p:Configuration=Release /p:Platform=win32 /p:UseEnv=true
       shell: cmd
 
-  windows-with-video-libvpx-unit-test-1:
+  windows-with-video-libvpx-schannel-unit-test-1:
     runs-on: windows-latest
     steps:
     - uses: actions/checkout@master
-    - name: get openssl
-      run: Invoke-WebRequest -Uri "https://github.com/pjsip/third_party_libs/raw/main/openssl-1.1.1s-win.zip" -OutFile ".\openssl.zip"
-      shell: powershell
-    - name: expand openssl
-      run: |
-        Expand-Archive -LiteralPath .\openssl.zip -DestinationPath .; pwd
-        cd openssl_build
-        Add-Content ..\openssl_dir.txt $pwd.Path
-      shell: powershell
-    - name: check openssl folder
-      run: |
-        set /P OPENSSL_DIR=<openssl_dir.txt
-        dir "%OPENSSL_DIR%\include"
-        dir "%OPENSSL_DIR%\lib"
-      shell: cmd
     - name: get vpx
       run: Invoke-WebRequest -Uri "https://github.com/pjsip/third_party_libs/raw/main/vpx-1.12-win.zip" -Outfile "vpx.zip"
       shell: powershell
@@ -231,6 +216,8 @@ jobs:
       run: |
         cd pjlib/include/pj; cp config_site_test.h config_site.h
         Add-Content config_site.h "#define PJ_HAS_SSL_SOCK 1"
+        Add-Content config_site.h "#define PJ_SSL_SOCK_IMP PJ_SSL_SOCK_IMP_SCHANNEL"
+        Add-Content config_site.h "#undef PJMEDIA_SRTP_HAS_DTLS"
         Add-Content config_site.h "#define PJMEDIA_HAS_VIDEO 1"
         Add-Content config_site.h "#define PJMEDIA_VIDEO_DEV_HAS_DSHOW 1"
         Add-Content config_site.h "#define PJMEDIA_HAS_LIBYUV 1"
@@ -258,7 +245,7 @@ jobs:
         set /P SDL_DIR=<sdl_dir.txt
         cd tests/pjsua/tools
         set INCLUDE=%INCLUDE%;%OPENSSL_DIR%\include;%VPX_DIR%\include;%SDL_DIR%\include
-        set LIB=%LIB%;%OPENSSL_DIR%\lib;%VPX_DIR%\lib;%SDL_DIR%\lib\x86
+        set LIB=%LIB%;%VPX_DIR%\lib;%SDL_DIR%\lib\x86
         call "%PROGRAMFILES%\Microsoft Visual Studio\2022\Enterprise\Common7\Tools\VsDevCmd.bat"
         msbuild cmp_wav.vcxproj /p:PlatformToolset=v143 /p:Configuration=Release /p:Platform=win32 /p:UseEnv=true
       shell: cmd
@@ -268,9 +255,8 @@ jobs:
         python-version: '3.10'
     - name: unit tests
       run: |
-        $env:OPENSSL_DIR = Get-Content .\openssl_dir.txt
         $env:SDL_DIR = Get-Content .\sdl_dir.txt
-        $env:PATH+=";$env:OPENSSL_DIR\bin;$env:SDL_DIR\lib\x86;"
+        $env:PATH+=";$env:SDL_DIR\lib\x86;"
         cd tests/pjsua; python runall.py
         cd ../../pjlib/bin; ./pjlib-test-i386-Win32-vc14-Release.exe --ci-mode
         cd ../../pjlib-util/bin; ./pjlib-util-test-i386-Win32-vc14-Release.exe

pjlib/build/pjlib.vcxproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug-Dynamic|ARM">
@@ -998,6 +998,7 @@
     </ClCompile>
     <ClCompile Include="..\src\pj\ssl_sock_ossl.c" />
     <ClCompile Include="..\src\pj\ssl_sock_gtls.c" />
+    <ClCompile Include="..\src\pj\ssl_sock_schannel.c" />
     <ClCompile Include="..\src\pj\string.c" />
     <ClCompile Include="..\src\pj\symbols.c">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug-Dynamic|Win32'">true</ExcludedFromBuild>

pjlib/include/pj/config.h

@@ -1077,6 +1077,9 @@
 /** Using Apple's Network framework */
 #define PJ_SSL_SOCK_IMP_APPLE       4
 
+/** Using Windows's Schannel */
+#define PJ_SSL_SOCK_IMP_SCHANNEL    5
+
 /**
  * Select which SSL socket implementation to use. Currently pjlib supports
  * PJ_SSL_SOCK_IMP_OPENSSL, which uses OpenSSL, and PJ_SSL_SOCK_IMP_GNUTLS,

pjlib/include/pj/ssl_sock.h

@@ -117,6 +117,11 @@ typedef enum pj_ssl_cert_verify_flag_t
      */
     PJ_SSL_CERT_ECHAIN_TOO_LONG                         = (1 << 8),
 
+    /**
+     * The certificate signature is created using a weak hashing algorithm.
+     */
+    PJ_SSL_CERT_EWEAK_SIGNATURE                         = (1 << 9),
+
     /**
      * The server identity does not match to any identities specified in 
      * the certificate, e.g: subjectAltName extension, subject common name.
@@ -145,6 +150,59 @@ typedef enum pj_ssl_cert_name_type
     PJ_SSL_CERT_NAME_IP
 } pj_ssl_cert_name_type;
 
+/**
+ * Field type for looking up SSL certificate in the certificate stores.
+ */
+typedef enum pj_ssl_cert_lookup_type
+{
+    /**
+     * No certificate to be looked up.
+     */
+    PJ_SSL_CERT_LOOKUP_NONE,
+
+    /**
+     * Lookup by subject, this will lookup any first certificate whose
+     * subject containing the specified keyword. Note that subject may not
+     * be unique in the store, so the lookup may end up selecting a wrong
+     * certificate.
+     */
+    PJ_SSL_CERT_LOOKUP_SUBJECT,
+
+    /**
+     * Lookup by fingerprint/thumbprint (SHA1 hash), this will lookup
+     * any first certificate whose fingerprint matching the specified
+     * keyword. The keyword is an array of hash octets.
+     */
+    PJ_SSL_CERT_LOOKUP_FINGERPRINT,
+
+    /**
+     * Lookup by friendly name, this will lookup any first certificate
+     * whose friendly name containing the specified keyword. Note that
+     * friendly name may not be unique in the store, so the lookup may end up
+     * selecting a wrong certificate.
+     */
+    PJ_SSL_CERT_LOOKUP_FRIENDLY_NAME
+
+} pj_ssl_cert_lookup_type;
+
+/**
+ * Describe structure of certificate lookup criteria.
+ */
+typedef struct pj_ssl_cert_lookup_criteria
+{
+    /**
+     * Certificate field type to look.
+     */
+    pj_ssl_cert_lookup_type type;
+
+    /*
+     * Keyword to match on the field specified in \a type.
+     */
+    pj_str_t                keyword;
+
+} pj_ssl_cert_lookup_criteria;
+
+
 /**
  * Describe structure of certificate info.
  */
@@ -273,6 +331,30 @@ PJ_DECL(pj_status_t) pj_ssl_cert_load_from_buffer(pj_pool_t *pool,
                                         const pj_str_t *privkey_pass,
                                         pj_ssl_cert_t **p_cert);
 
+/**
+ * Create credential from OS certificate store, this function will lookup
+ * certificate using the specified criterias.
+ *
+ * Currently this is used by Windows Schannel backend only, it will lookup
+ * in the Current User store first, if no certificate with the specified
+ * criteria is not found, it will lookup in the Local Machine store.
+ *
+ * Note that for manual verification (e.g: when pj_ssl_sock_param.verify_peer
+ * is disabled), the backend will provide pre-verification result against
+ * trusted CA certificates in Current User store only (will not check CA
+ * certificates in the Local Machine store).
+ *
+ * @param pool              The pool.
+ * @param criteria          The lookup criteria.
+ * @param p_cert            Pointer to credential instance to be created.
+ *
+ * @return                  PJ_SUCCESS when successful.
+ */
+PJ_DECL(pj_status_t) pj_ssl_cert_load_from_store(
+                                pj_pool_t *pool,
+                                const pj_ssl_cert_lookup_criteria *criteria,
+                                pj_ssl_cert_t **p_cert);
+
 /**
  * Dump SSL certificate info.
  *

pjlib/src/pj/activesock.c

@@ -513,7 +513,8 @@ static void ioqueue_on_read_complete(pj_ioqueue_key_t *key,
                 ret = (*asock->cb.on_data_read)(asock, r->pkt, r->size,
                                                 PJ_SUCCESS, &remainder);
                 PJ_ASSERT_ON_FAIL(
-                    !asock->stream_oriented || remainder <= r->size, {
+                    !ret || !asock->stream_oriented || remainder <= r->size,
+                    {
                         PJ_LOG(2, ("",
                                    "App bug! Invalid remainder length from "
                                    "activesock on_data_read()."));
@@ -589,7 +590,8 @@ static void ioqueue_on_read_complete(pj_ioqueue_key_t *key,
                 ret = (*asock->cb.on_data_read)(asock, r->pkt, r->size,
                                                 status, &remainder);
                 PJ_ASSERT_ON_FAIL(
-                    !asock->stream_oriented || remainder <= r->size, {
+                    !ret || !asock->stream_oriented || remainder <= r->size,
+                    {
                         PJ_LOG(2, ("",
                                    "App bug! Invalid remainder length from "
                                    "activesock on_data_read()."));

pjlib/src/pj/ssl_sock_common.c

@@ -173,6 +173,10 @@ PJ_DEF(pj_status_t) pj_ssl_cert_get_verify_status_strings(
         case PJ_SSL_CERT_ECHAIN_TOO_LONG:
             p = "The certificate chain length is too long";
             break;
+        case PJ_SSL_CERT_EWEAK_SIGNATURE:
+            p = "The certificate signature is created using a weak hashing "
+                "algorithm";
+            break;
         case PJ_SSL_CERT_EIDENTITY_NOT_MATCH:
             p = "The server identity does not match to any identities "
                 "specified in the certificate";