[libsoup] NTLMv2 responses support
- From: Claudio Saavedra <csaavedra src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [libsoup] NTLMv2 responses support
- Date: Mon, 8 Oct 2018 10:49:43 +0000 (UTC)
commit 0e7b2c1466434a992b6a387497432e1c97b6125c
Author: Michal Hrubý <hrubym gmail com>
Date: Wed Sep 12 17:56:46 2018 +0200
NTLMv2 responses support
libsoup/soup-auth-ntlm.c | 191 +++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 175 insertions(+), 16 deletions(-)
---
diff --git a/libsoup/soup-auth-ntlm.c b/libsoup/soup-auth-ntlm.c
index f4009aa8..e4051000 100644
--- a/libsoup/soup-auth-ntlm.c
+++ b/libsoup/soup-auth-ntlm.c
@@ -12,6 +12,8 @@
#include <errno.h>
#include <stdlib.h>
#include <string.h>
+#include <stdio.h>
+
#include <glib.h>
#include "soup-auth-ntlm.h"
@@ -26,14 +28,20 @@ static char *soup_ntlm_request (void);
static gboolean soup_ntlm_parse_challenge (const char *challenge,
char **nonce,
char **default_domain,
- gboolean *ntlmv2_session);
-static char *soup_ntlm_response (const char *nonce,
+ gboolean *ntlmv2_session,
+ gboolean *negotiate_target,
+ char **target_info,
+ size_t *target_info_sz);
+static char *soup_ntlm_response (const char *nonce,
const char *user,
guchar nt_hash[21],
guchar lm_hash[21],
const char *host,
const char *domain,
- gboolean ntlmv2_session);
+ gboolean ntlmv2_session,
+ gboolean negotiate_target,
+ const char *target_info,
+ size_t target_info_sz);
typedef enum {
SOUP_NTLM_NEW,
@@ -49,6 +57,9 @@ typedef struct {
char *nonce;
char *response_header;
gboolean ntlmv2_session;
+ gboolean negotiate_target;
+ char *target_info;
+ size_t target_info_sz;
} SoupNTLMConnectionState;
typedef enum {
@@ -339,7 +350,8 @@ soup_auth_ntlm_update_connection (SoupConnectionAuth *auth, SoupMessage *msg,
if (!soup_ntlm_parse_challenge (auth_header + 5, &conn->nonce,
priv->domain ? NULL : &priv->domain,
- &conn->ntlmv2_session)) {
+ &conn->ntlmv2_session, &conn->negotiate_target,
+ &conn->target_info, &conn->target_info_sz)) {
conn->state = SOUP_NTLM_FAILED;
return FALSE;
}
@@ -521,7 +533,10 @@ soup_auth_ntlm_get_connection_authorization (SoupConnectionAuth *auth,
priv->lm_hash,
NULL,
priv->domain,
- conn->ntlmv2_session);
+ conn->ntlmv2_session,
+ conn->negotiate_target,
+ conn->target_info,
+ conn->target_info_sz);
}
g_clear_pointer (&conn->nonce, g_free);
conn->state = SOUP_NTLM_SENT_RESPONSE;
@@ -647,14 +662,20 @@ typedef struct {
#define NTLM_CHALLENGE_NONCE_OFFSET 24
#define NTLM_CHALLENGE_NONCE_LENGTH 8
#define NTLM_CHALLENGE_DOMAIN_STRING_OFFSET 12
+#define NTLM_CHALLENGE_TARGET_INFORMATION_OFFSET 40
#define NTLM_CHALLENGE_FLAGS_OFFSET 20
#define NTLM_FLAGS_NEGOTIATE_NTLMV2 0x00080000
+#define NTLM_FLAGS_NEGOTIATE_TARGET_INFORMATION 0x00800000
+#define NTLM_FLAGS_REQUEST_TARGET 0x00000004
#define NTLM_RESPONSE_HEADER "NTLMSSP\x00\x03\x00\x00\x00"
#define NTLM_RESPONSE_FLAGS 0x8201
+#define NTLM_RESPONSE_TARGET_INFORMATION_OFFSET 44
#define NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY 0x00080000
+#define HMAC_MD5_LENGTH 16
+
typedef struct {
guchar header[12];
@@ -686,10 +707,14 @@ static gboolean
soup_ntlm_parse_challenge (const char *challenge,
char **nonce,
char **default_domain,
- gboolean *ntlmv2_session)
+ gboolean *ntlmv2_session,
+ gboolean *negotiate_target,
+ char **target_info,
+ size_t *target_info_sz)
{
gsize clen;
NTLMString domain;
+ NTLMString target;
guchar *chall;
guint32 flags;
@@ -703,6 +728,8 @@ soup_ntlm_parse_challenge (const char *challenge,
memcpy (&flags, chall + NTLM_CHALLENGE_FLAGS_OFFSET, sizeof(flags));
flags = GUINT_FROM_LE (flags);
*ntlmv2_session = (flags & NTLM_FLAGS_NEGOTIATE_NTLMV2) ? TRUE : FALSE;
+ //To know if NTLMv2 responses should be calculated
+ *negotiate_target = (flags & NTLM_FLAGS_NEGOTIATE_TARGET_INFORMATION ) ? TRUE : FALSE;
if (default_domain) {
memcpy (&domain, chall + NTLM_CHALLENGE_DOMAIN_STRING_OFFSET, sizeof (domain));
@@ -723,6 +750,19 @@ soup_ntlm_parse_challenge (const char *challenge,
*nonce = g_memdup (chall + NTLM_CHALLENGE_NONCE_OFFSET,
NTLM_CHALLENGE_NONCE_LENGTH);
}
+ //For NTLMv2 response
+ if (*negotiate_target && target_info) {
+ memcpy (&target, chall + NTLM_CHALLENGE_TARGET_INFORMATION_OFFSET, sizeof (target));
+ target.length = GUINT16_FROM_LE (target.length);
+ target.offset = GUINT16_FROM_LE (target.offset);
+
+ if (clen < target.length + target.offset) {
+ g_free (chall);
+ return FALSE;
+ }
+ *target_info = g_memdup (chall + target.offset, target.length);
+ *target_info_sz = target.length;
+ }
g_free (chall);
return TRUE;
@@ -761,6 +801,101 @@ calc_ntlm2_session_response (const char *nonce,
calc_response (nt_hash, ntlmv2_hash, nt_resp);
}
+/* Compute HMAC-MD5 with Glib function*/
+static void
+calc_hmac_md5 (unsigned char *hmac, const guchar *key, gsize key_sz, const guchar *data, gsize data_sz)
+{
+ char *hmac_hex, *hex_pos;
+ size_t count;
+
+ hmac_hex = g_compute_hmac_for_data(G_CHECKSUM_MD5, key, key_sz, data, data_sz);
+ hex_pos = hmac_hex;
+ for (count = 0; count < HMAC_MD5_LENGTH; count++)
+ {
+ sscanf(hex_pos, "%2hhx", &hmac[count]);
+ hex_pos += 2;
+ }
+ g_free(hmac_hex);
+}
+
+static void
+calc_ntlmv2_response (const char *user, const char *domain,
+ const guchar *nt_hash, const gsize nt_hash_sz,
+ const guchar *nonce,
+ const char *target_info, size_t target_info_sz,
+ guchar *lm_resp, size_t lm_resp_sz,
+ guchar *nt_resp, size_t nt_resp_sz)
+{
+ const unsigned char blob_signature[] = {0x01,0x01,0x00,0x00};
+ const unsigned char blob_reserved[] = {0x00,0x00,0x00,0x00};
+ gint64 blob_timestamp;
+ unsigned char client_nonce[8];
+ const unsigned char blob_unknown[] = {0x00,0x00,0x00,0x00};
+
+ unsigned char ntv2_hash[HMAC_MD5_LENGTH];
+ guchar *nonce_blob, *blob, *p_blob;
+ unsigned char nonce_blob_hash[HMAC_MD5_LENGTH];
+ unsigned char nonce_client_nonce[16], nonce_client_nonce_hash[HMAC_MD5_LENGTH];
+ gchar *user_domain, *user_domain_conv;
+ gsize user_domain_conv_sz;
+ size_t blob_sz;
+
+ /* create HMAC-MD5 hash of Unicode uppercase username and Unicode domain */
+ user_domain = g_strconcat ((const gchar *) g_utf8_strup ((const gchar *) user, (gsize) strlen(user)),
(gchar *) domain, NULL);
+ user_domain_conv = g_convert (user_domain, -1, "UCS-2LE", "UTF-8", NULL, &user_domain_conv_sz, NULL);
+ calc_hmac_md5 (ntv2_hash, nt_hash, nt_hash_sz, (const guchar *)user_domain_conv, user_domain_conv_sz);
+ g_free (user_domain);
+ g_free (user_domain_conv);
+
+ /* create random client nonce */
+ for (int i = 0; i < sizeof (client_nonce); i++)
+ {
+ client_nonce[i] = g_random_int();
+ }
+
+ /* create timestamp for blob
+ * LE, 64-bit signed value, number of tenths of a ms since January 1, 1601.*/
+ blob_timestamp = GINT64_TO_LE(((unsigned long)time(NULL) + 11644473600) * 10000000);
+
+ /* create blob */
+ blob_sz = sizeof (blob_signature) + sizeof (blob_reserved) +
+ sizeof (blob_timestamp) + sizeof (client_nonce) +
+ sizeof (blob_unknown) + target_info_sz;
+ p_blob = blob = g_malloc (blob_sz);
+ memset (blob, 0, blob_sz);
+ memcpy (p_blob, blob_signature, sizeof (blob_signature));
+ memcpy (p_blob += sizeof (blob_signature), blob_reserved, sizeof (blob_reserved));
+ memcpy (p_blob += sizeof (blob_reserved), &blob_timestamp, sizeof (blob_timestamp));
+ memcpy (p_blob += sizeof (blob_timestamp), client_nonce, sizeof (client_nonce));
+ memcpy (p_blob += sizeof (client_nonce), blob_unknown, sizeof (blob_unknown));
+ memcpy (p_blob += sizeof (blob_unknown), target_info, target_info_sz);
+
+ /* create HMAC-MD5 hash of concatenated nonce and blob */
+ nonce_blob = g_malloc (NTLM_CHALLENGE_NONCE_LENGTH + blob_sz);
+ memcpy (nonce_blob, nonce, NTLM_CHALLENGE_NONCE_LENGTH);
+ memcpy (nonce_blob + NTLM_CHALLENGE_NONCE_LENGTH, blob, blob_sz);
+ calc_hmac_md5 (nonce_blob_hash, (const guchar *)ntv2_hash, (gsize) sizeof (ntv2_hash), (const guchar
*) nonce_blob, (gsize) NTLM_CHALLENGE_NONCE_LENGTH + blob_sz);
+ g_free (nonce_blob);
+
+ /* create NTv2 response */
+ memset (nt_resp, 0, nt_resp_sz);
+ memcpy (nt_resp, nonce_blob_hash, sizeof (nonce_blob_hash));
+ memcpy (nt_resp + sizeof (nonce_blob_hash), blob, blob_sz);
+
+ g_free (blob);
+
+ /* LMv2
+ * create HMAC-MD5 hash of concatenated nonce and client nonce
+ */
+ memcpy (nonce_client_nonce, nonce, NTLM_CHALLENGE_NONCE_LENGTH);
+ memcpy (nonce_client_nonce + NTLM_CHALLENGE_NONCE_LENGTH, client_nonce, sizeof (client_nonce));
+ calc_hmac_md5 (nonce_client_nonce_hash, (const guchar *) ntv2_hash, (gsize) sizeof (ntv2_hash),
(const guchar *) nonce_client_nonce, (gsize) NTLM_CHALLENGE_NONCE_LENGTH + sizeof (client_nonce));
+
+ /* create LMv2 response */
+ memset (lm_resp, 0, lm_resp_sz);
+ memcpy (lm_resp, nonce_client_nonce_hash, sizeof (nonce_client_nonce_hash));
+ memcpy (lm_resp + sizeof (nonce_client_nonce_hash), client_nonce, sizeof (client_nonce));
+}
static char *
soup_ntlm_response (const char *nonce,
@@ -769,31 +904,54 @@ soup_ntlm_response (const char *nonce,
guchar lm_hash[21],
const char *host,
const char *domain,
- gboolean ntlmv2_session)
+ gboolean ntlmv2_session,
+ gboolean negotiate_target,
+ const char *target_info,
+ size_t target_info_sz)
{
+
int offset;
- gsize hlen, dlen, ulen;
- guchar lm_resp[24], nt_resp[24];
+ gsize hlen, dlen, ulen, nt_resp_sz;
+ guchar lm_resp[24], *nt_resp;
char *user_conv, *host_conv, *domain_conv;
NTLMResponse resp;
char *out, *p;
int state, save;
- if (ntlmv2_session) {
+ if (negotiate_target)
+ {
+ /* nonce_blob_hash 16 + blob_signature 4 + blob_reserved 4 +
+ * blob_timestamp 8 + client_nonce 8 + blob_unknown 4 +
+ * target_info*/
+ nt_resp_sz = NTLM_RESPONSE_TARGET_INFORMATION_OFFSET + target_info_sz;
+ } else {
+ nt_resp_sz = 24;
+ }
+ nt_resp = g_malloc (nt_resp_sz);
+
+ if (ntlmv2_session && !negotiate_target) {
calc_ntlm2_session_response (nonce, nt_hash, lm_hash,
lm_resp, sizeof(lm_resp), nt_resp);
- } else {
- /* Compute a regular response */
+ } else if (!negotiate_target){
+ /* Compute a regular NTLMv1 response */
calc_response (nt_hash, (guchar *) nonce, nt_resp);
calc_response (lm_hash, (guchar *) nonce, lm_resp);
+ } else {
+ calc_ntlmv2_response (user, domain,
+ nt_hash, 21,
+ (guchar *) nonce,
+ target_info, target_info_sz,
+ lm_resp, sizeof (lm_resp),
+ nt_resp, (size_t) nt_resp_sz);
}
memset (&resp, 0, sizeof (resp));
memcpy (resp.header, NTLM_RESPONSE_HEADER, sizeof (resp.header));
resp.flags = GUINT32_TO_LE (NTLM_RESPONSE_FLAGS);
- if (ntlmv2_session)
+ if (ntlmv2_session && !negotiate_target)
resp.flags |= GUINT32_TO_LE (NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY);
-
+ if (negotiate_target)
+ resp.flags |= GUINT32_TO_LE (NTLM_FLAGS_REQUEST_TARGET);
offset = sizeof (resp);
if (!host)
@@ -807,7 +965,7 @@ soup_ntlm_response (const char *nonce,
ntlm_set_string (&resp.user, &offset, ulen);
ntlm_set_string (&resp.host, &offset, hlen);
ntlm_set_string (&resp.lm_resp, &offset, sizeof (lm_resp));
- ntlm_set_string (&resp.nt_resp, &offset, sizeof (nt_resp));
+ ntlm_set_string (&resp.nt_resp, &offset, nt_resp_sz);
out = g_malloc (((offset + 3) * 4) / 3 + 6);
memcpy (out, "NTLM ", 5);
@@ -825,7 +983,7 @@ soup_ntlm_response (const char *nonce,
FALSE, p, &state, &save);
p += g_base64_encode_step (lm_resp, sizeof (lm_resp),
FALSE, p, &state, &save);
- p += g_base64_encode_step (nt_resp, sizeof (nt_resp),
+ p += g_base64_encode_step (nt_resp, nt_resp_sz,
FALSE, p, &state, &save);
p += g_base64_encode_close (FALSE, p, &state, &save);
*p = '\0';
@@ -833,6 +991,7 @@ soup_ntlm_response (const char *nonce,
g_free (domain_conv);
g_free (user_conv);
g_free (host_conv);
+ g_free (nt_resp);
return out;
}
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