check uploaded file integrity

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

1 files changed, 26 insertions, 9 deletions

diff --git a/src/eyefiservice.cc b/src/eyefiservice.cc
index 153a7c4..d233a07 100644
--- a/src/eyefiservice.cc
+++ b/src/eyefiservice.cc
@@ -124,2 +124,5 @@ int eyefiService::UploadPhoto(
 
+    std::string jf;
+    binary_t digest, idigest;
+
     for(soap_multipart::iterator i=mime.begin(),ie=mime.end();i!=ie;++i) {
@@ -131,8 +134,9 @@ int eyefiService::UploadPhoto(
 
-#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") ) {
@@ -145,2 +149,10 @@ int eyefiService::UploadPhoto(
 #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);
@@ -148,5 +160,3 @@ int eyefiService::UploadPhoto(
 		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);
@@ -155,2 +165,10 @@ int eyefiService::UploadPhoto(
 	    close(fd);
+	}
+    }
+
+    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;
@@ -180,4 +198,3 @@ int eyefiService::UploadPhoto(
 	    }
-	}
-    }
+
     r.success = true;