check uploaded file integrity

Signed-off-by: Michael Krelin <hacker@klever.net>

1 files changed, 46 insertions, 29 deletions

diff --git a/src/eyefiservice.cc b/src/eyefiservice.cc
index 153a7c4..d233a07 100644
--- a/src/eyefiservice.cc
+++ b/src/eyefiservice.cc
@@ -122,6 +122,9 @@ int eyefiService::UploadPhoto(
     std::string td = eyekinfig.get_targetdir();
     tmpdir_t indir(td+"/.incoming.XXXXXX");
 
+    std::string jf;
+    binary_t digest, idigest;
+
     for(soap_multipart::iterator i=mime.begin(),ie=mime.end();i!=ie;++i) {
 #ifndef NDEBUG
         syslog(LOG_DEBUG,
@@ -129,12 +132,13 @@ int eyefiService::UploadPhoto(
                 (*i).id, (*i).type, (long)(*i).size );
 #endif
 
-#ifndef NDEBUG
         if((*i).id && !strcmp((*i).id,"INTEGRITYDIGEST")) {
-            std::string idigest((*i).ptr,(*i).size);
-            syslog(LOG_DEBUG, " INTEGRITYDIGEST=%s", idigest.c_str());
-        }
+            std::string idigestr((*i).ptr,(*i).size);
+#ifndef NDEBUG
+            syslog(LOG_DEBUG, " INTEGRITYDIGEST=%s", idigestr.c_str());
 #endif
+            idigest.from_hex(idigestr);
+        }
         if( (*i).id && !strcmp((*i).id,"FILENAME") ) {
             assert( (*i).type && !strcmp((*i).type,"application/x-tar") );
 #ifdef III_SAVE_TARS
@@ -143,43 +147,56 @@ int eyefiService::UploadPhoto(
                 std::ofstream(tarfile.c_str(),std::ios::out|std::ios::binary).write((*i).ptr,(*i).size);
             }
 #endif
+
+            if(!jf.empty()) throw std::runtime_error("already seen tarball");
+            if(!digest.empty()) throw std::runtime_error("already have integrity digest");
+            digest = integrity_digest((*i).ptr,(*i).size,eyekinfig.get_upload_key());
+#ifndef NDEBUG
+            syslog(LOG_DEBUG," computed integrity digest=%s", digest.hex().c_str());
+#endif
+
             tarchive_t a((*i).ptr,(*i).size);
             if(!a.read_next_header())
                 throw std::runtime_error("failed to tarchive_t::read_next_header())");
-            std::string jf = indir.get_file(a.entry_pathname());
-            std::string::size_type ls = jf.rfind('/');
-            std::string jbn = (ls==std::string::npos)?jf:jf.substr(ls+1);
+            jf = indir.get_file(a.entry_pathname());
             int fd=open(jf.c_str(),O_CREAT|O_WRONLY,0666);
             assert(fd>0);
             a.read_data_into_fd(fd);
             close(fd);
-            std::string tf = td+'/'+jbn;
-            bool success = false;
+        }
+    }
+
+    if(jf.empty()) throw std::runtime_error("haven't seen jpeg file");
+    if(digest!=idigest) throw std::runtime_error("integrity digest verification failed");
+
+    std::string::size_type ls = jf.rfind('/');
+    std::string jbn = (ls==std::string::npos)?jf:jf.substr(ls+1);
+    std::string tf = td+'/'+jbn;
+    bool success = false;
+    if(!link(jf.c_str(), tf.c_str())) {
+        unlink(jf.c_str()); success = true;
+    }else{
+        for(int i=1;i<32767;++i) {
+            tf = (const char*)gnu::autosprintf( "%s/(%05d)%s",
+                    td.c_str(), i, jbn.c_str() );
             if(!link(jf.c_str(), tf.c_str())) {
                 unlink(jf.c_str()); success = true;
-            }else{
-                for(int i=1;i<32767;++i) {
-                    tf = (const char*)gnu::autosprintf( "%s/(%05d)%s",
-                            td.c_str(), i, jbn.c_str() );
-                    if(!link(jf.c_str(), tf.c_str())) {
-                        unlink(jf.c_str()); success = true;
-                        break;
-                    }
-                }
-            }
-            std::string cmd = eyekinfig.get_on_upload_photo();
-            if(success && !cmd.empty()) {
-                if(detached_child()) {
-                    putenv( gnu::autosprintf("EYEFI_MACADDRESS=%s",macaddress.c_str()) );
-                    putenv( gnu::autosprintf("EYEFI_UPLOADED=%s",tf.c_str()) );
-                    char *argv[] = { (char*)"/bin/sh", (char*)"-c", (char*)cmd.c_str(), 0 };
-                    execv("/bin/sh",argv);
-                    syslog(LOG_ERR,"Failed to execute '%s'",cmd.c_str());
-                    _exit(-1);
-                }
+                break;
             }
         }
     }
+    std::string cmd = eyekinfig.get_on_upload_photo();
+    if(success && !cmd.empty()) {
+        if(detached_child()) {
+            putenv( gnu::autosprintf("EYEFI_MACADDRESS=%s",macaddress.c_str()) );
+            putenv( gnu::autosprintf("EYEFI_UPLOADED=%s",tf.c_str()) );
+            char *argv[] = { (char*)"/bin/sh", (char*)"-c", (char*)cmd.c_str(), 0 };
+            execv("/bin/sh",argv);
+            syslog(LOG_ERR,"Failed to execute '%s'",cmd.c_str());
+            _exit(-1);
+        }
+    }
+
     r.success = true;
     return SOAP_OK;
 }