imap: Added support for sasl ntlm authentication

lib/imap.c

@@ -435,6 +435,8 @@ static void state(struct connectdata *conn,
     "AUTHENTICATE_PLAIN",
     "AUTHENTICATE_LOGIN",
     "AUTHENTICATE_LOGIN_PASSWD",
+    "AUTHENTICATE_NTLM",
+    "AUTHENTICATE_NTLM_TYPE2MSG",
     "AUTHENTICATE",
     "LOGIN",
     "SELECT",
@@ -513,6 +515,14 @@ static CURLcode imap_authenticate(struct connectdata *conn)
 
   /* Check supported authentication mechanisms by decreasing order of
      security */
+#ifdef USE_NTLM
+  if(imapc->authmechs & SASL_MECH_NTLM) {
+    mech = "NTLM";
+    authstate = IMAP_AUTHENTICATE_NTLM;
+    imapc->authused = SASL_MECH_NTLM;
+  }
+  else
+#endif
   if(imapc->authmechs & SASL_MECH_LOGIN) {
     mech = "LOGIN";
     authstate = IMAP_AUTHENTICATE_LOGIN;
@@ -764,6 +774,86 @@ static CURLcode imap_state_auth_login_password_resp(struct connectdata *conn,
   return result;
 }
 
+#ifdef USE_NTLM
+/* For AUTHENTICATE NTLM responses */
+static CURLcode imap_state_auth_ntlm_resp(struct connectdata *conn,
+                                          int imapcode,
+                                          imapstate instate)
+{
+  CURLcode result = CURLE_OK;
+  struct SessionHandle *data = conn->data;
+  size_t len = 0;
+  char *type1msg = NULL;
+
+  (void)instate; /* no use for this yet */
+
+  if(imapcode != '+') {
+    failf(data, "Access denied: %d", imapcode);
+    result = CURLE_LOGIN_DENIED;
+  }
+  else {
+    /* Create the type-1 message */
+    result = Curl_sasl_create_ntlm_type1_message(conn->user, conn->passwd,
+                                                 &conn->ntlm,
+                                                 &type1msg, &len);
+
+    /* Send the message */
+    if(!result) {
+      if(type1msg) {
+        result = Curl_pp_sendf(&conn->proto.imapc.pp, "%s", type1msg);
+
+        if(!result)
+          state(conn, IMAP_AUTHENTICATE_NTLM_TYPE2MSG);
+      }
+
+      Curl_safefree(type1msg);
+    }
+  }
+
+  return result;
+}
+
+/* For NTLM type-2 responses (sent in reponse to our type-1 message) */
+static CURLcode imap_state_auth_ntlm_type2msg_resp(struct connectdata *conn,
+                                                   int imapcode,
+                                                   imapstate instate)
+{
+  CURLcode result = CURLE_OK;
+  struct SessionHandle *data = conn->data;
+  size_t len = 0;
+  char *type3msg = NULL;
+
+  (void)instate; /* no use for this yet */
+
+  if(imapcode != '+') {
+    failf(data, "Access denied: %d", imapcode);
+    result = CURLE_LOGIN_DENIED;
+  }
+  else {
+    /* Create the type-3 message */
+    result = Curl_sasl_create_ntlm_type3_message(data,
+                                                 data->state.buffer + 2,
+                                                 conn->user, conn->passwd,
+                                                 &conn->ntlm,
+                                                 &type3msg, &len);
+
+    /* Send the message */
+    if(!result) {
+      if(type3msg) {
+        result = Curl_pp_sendf(&conn->proto.imapc.pp, "%s", type3msg);
+
+        if(!result)
+          state(conn, IMAP_AUTHENTICATE);
+      }
+
+      Curl_safefree(type3msg);
+    }
+  }
+
+  return result;
+}
+#endif
+
 /* For final responses to the AUTHENTICATE sequence */
 static CURLcode imap_state_auth_final_resp(struct connectdata *conn,
                                            int imapcode,
@@ -1002,6 +1092,17 @@ static CURLcode imap_statemach_act(struct connectdata *conn)
                                                    imapc->state);
       break;
 
+#ifdef USE_NTLM
+    case IMAP_AUTHENTICATE_NTLM:
+      result = imap_state_auth_ntlm_resp(conn, imapcode, imapc->state);
+      break;
+
+    case IMAP_AUTHENTICATE_NTLM_TYPE2MSG:
+      result = imap_state_auth_ntlm_type2msg_resp(conn, imapcode,
+                                                  imapc->state);
+      break;
+#endif
+
     case IMAP_AUTHENTICATE:
       result = imap_state_auth_final_resp(conn, imapcode, imapc->state);
       break;

lib/imap.h

@@ -38,6 +38,8 @@ typedef enum {
   IMAP_AUTHENTICATE_PLAIN,
   IMAP_AUTHENTICATE_LOGIN,
   IMAP_AUTHENTICATE_LOGIN_PASSWD,
+  IMAP_AUTHENTICATE_NTLM,
+  IMAP_AUTHENTICATE_NTLM_TYPE2MSG,
   IMAP_AUTHENTICATE,
   IMAP_LOGIN,
   IMAP_SELECT,