Remove trailing "." from SAN and CN

src/LibgnutlsTLSSession.cc

@@ -313,6 +313,17 @@ int GnuTLSSession::tlsConnect(const std::string& hostname, TLSVersion& version,
       ret = gnutls_x509_crt_get_subject_alt_name(cert, i, altName, &altNameLen,
                                                  nullptr);
       if (ret == GNUTLS_SAN_DNSNAME) {
+        if (altNameLen == 0) {
+          continue;
+        }
+
+        if (altName[altNameLen - 1] == '.') {
+          --altNameLen;
+          if (altNameLen == 0) {
+            continue;
+          }
+        }
+
         dnsNames.push_back(std::string(altName, altNameLen));
       }
       else if (ret == GNUTLS_SAN_IPADDRESS) {
@@ -323,7 +334,14 @@ int GnuTLSSession::tlsConnect(const std::string& hostname, TLSVersion& version,
     ret = gnutls_x509_crt_get_dn_by_oid(cert, GNUTLS_OID_X520_COMMON_NAME, 0, 0,
                                         altName, &altNameLen);
     if (ret == 0) {
-      commonName.assign(altName, altNameLen);
+      if (altNameLen > 0) {
+        if (altName[altNameLen - 1] == '.') {
+          --altNameLen;
+          if (altNameLen > 0) {
+            commonName.assign(altName, altNameLen);
+          }
+        }
+      }
     }
     if (!net::verifyHostname(hostname, dnsNames, ipAddrs, commonName)) {
       handshakeErr = "hostname does not match";

src/LibsslTLSSession.cc

@@ -259,6 +259,15 @@ int OpenSSLTLSSession::tlsConnect(const std::string& hostname,
             continue;
           }
           size_t len = ASN1_STRING_length(altName->d.ia5);
+          if (len == 0) {
+            continue;
+          }
+          if (name[len - 1] == '.') {
+            --len;
+            if (len == 0) {
+              continue;
+            }
+          }
           dnsNames.push_back(std::string(name, len));
         }
         else if (altName->type == GEN_IPADD) {
@@ -290,6 +299,17 @@ int OpenSSLTLSSession::tlsConnect(const std::string& hostname,
       if (outlen < 0) {
         continue;
       }
+      if (outlen == 0) {
+        OPENSSL_free(out);
+        continue;
+      }
+      if (out[outlen - 1] == '.') {
+        --outlen;
+        if (outlen == 0) {
+          OPENSSL_free(out);
+          continue;
+        }
+      }
       commonName.assign(&out[0], &out[outlen]);
       OPENSSL_free(out);
       break;