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Diffstat (limited to 'src/charon/plugins/eap_mschapv2/eap_mschapv2.c')
-rw-r--r--src/charon/plugins/eap_mschapv2/eap_mschapv2.c98
1 files changed, 65 insertions, 33 deletions
diff --git a/src/charon/plugins/eap_mschapv2/eap_mschapv2.c b/src/charon/plugins/eap_mschapv2/eap_mschapv2.c
index 07ca48e6f..0e3fac780 100644
--- a/src/charon/plugins/eap_mschapv2/eap_mschapv2.c
+++ b/src/charon/plugins/eap_mschapv2/eap_mschapv2.c
@@ -11,12 +11,13 @@
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
- *
- * $Id: eap_mschapv2.c 4896 2009-02-24 13:39:50Z martin $
*/
#include "eap_mschapv2.h"
+#include <ctype.h>
+#include <unistd.h>
+
#include <daemon.h>
#include <library.h>
#include <utils/enumerator.h>
@@ -141,7 +142,7 @@ ENUM_END(mschapv2_error_names, ERROR_CHANGING_PASSWORD);
/* Name we send as authenticator */
#define MSCHAPV2_HOST_NAME "strongSwan"
/* Message sent on success */
-#define SUCCESS_MESSAGE " M=Welcome to strongSwan"
+#define SUCCESS_MESSAGE " M=Welcome2strongSwan"
/* Message sent on failure */
#define FAILURE_MESSAGE "E=691 R=1 C="
/* Length of the complete failure message */
@@ -366,7 +367,6 @@ static status_t AuthenticatorResponse(chunk_t password_hash_hash,
static const chunk_t magic1 = chunk_from_buf(magic1_data);
static const chunk_t magic2 = chunk_from_buf(magic2_data);
- status_t status = FAILED;
chunk_t digest = chunk_empty, concat;
hasher_t *hasher;
@@ -456,7 +456,7 @@ static status_t GenerateMSK(chunk_t password_hash_hash,
hasher->allocate_hash(hasher, concat, &master_send_key);
master_send_key.len = 16;
- *msk = chunk_cat("cccc", master_receive_key, keypad, master_send_key, keypad);
+ *msk = chunk_cat("cccc", master_receive_key, master_send_key, keypad, keypad);
hasher->destroy(hasher);
chunk_free(&master_key);
@@ -527,6 +527,24 @@ static chunk_t ascii_to_unicode(chunk_t ascii)
}
/**
+ * sanitize a string for printing
+ */
+static char* sanitize(char *str)
+{
+ char *pos = str;
+
+ while (pos && *pos)
+ {
+ if (!isprint(*pos))
+ {
+ *pos = '?';
+ }
+ pos++;
+ }
+ return str;
+}
+
+/**
* Returns a chunk of just the username part of the given user identity.
* Note: the chunk points to internal data of the identification.
*/
@@ -535,7 +553,7 @@ static chunk_t extract_username(identification_t* identification)
char *has_domain;
chunk_t id;
id = identification->get_encoding(identification);
- has_domain = (char*)memrchr(id.ptr, '\\', id.len);
+ has_domain = (char*)memchr(id.ptr, '\\', id.len);
if (has_domain)
{
int len;
@@ -546,6 +564,14 @@ static chunk_t extract_username(identification_t* identification)
return id;
}
+/**
+ * Set the ms_length field using aligned write
+ */
+static void set_ms_length(eap_mschapv2_header_t *eap, u_int16_t len)
+{
+ len = htons(len - 5);
+ memcpy(&eap->ms_length, &len, sizeof(u_int16_t));
+}
/**
* Implementation of eap_method_t.initiate for the peer
@@ -567,8 +593,6 @@ static status_t initiate_server(private_eap_mschapv2_t *this, eap_payload_t **ou
const char *name = MSCHAPV2_HOST_NAME;
u_int16_t len = CHALLENGE_PAYLOAD_LEN + sizeof(MSCHAPV2_HOST_NAME) - 1;
- DBG1(DBG_IKE, "initiating EAP-MS-CHAPv2");
-
rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
if (!rng)
{
@@ -585,7 +609,7 @@ static status_t initiate_server(private_eap_mschapv2_t *this, eap_payload_t **ou
eap->type = EAP_MSCHAPV2;
eap->opcode = MSCHAPV2_CHALLENGE;
eap->ms_chapv2_id = this->mschapv2id;
- eap->ms_length = htons(len - 5);
+ set_ms_length(eap, len);
cha = (eap_mschapv2_challenge_t*)eap->data;
cha->value_size = CHALLENGE_LEN;
@@ -625,7 +649,8 @@ static status_t process_peer_challenge(private_eap_mschapv2_t *this,
if (cha->value_size != CHALLENGE_LEN)
{
- DBG1(DBG_IKE, "received invalid EAP-MS-CHAPv2 message: invalid challenge size");
+ DBG1(DBG_IKE, "received invalid EAP-MS-CHAPv2 message: "
+ "invalid challenge size");
return FAILED;
}
@@ -643,11 +668,11 @@ static status_t process_peer_challenge(private_eap_mschapv2_t *this,
rng->destroy(rng);
shared = charon->credentials->get_shared(charon->credentials,
- SHARED_EAP, this->peer, this->server);
+ SHARED_EAP, this->peer, this->server);
if (shared == NULL)
{
- DBG1(DBG_IKE, "no EAP key found for hosts '%D' - '%D'",
- this->server, this->peer);
+ DBG1(DBG_IKE, "no EAP key found for hosts '%Y' - '%Y'",
+ this->server, this->peer);
return NOT_FOUND;
}
@@ -672,7 +697,7 @@ static status_t process_peer_challenge(private_eap_mschapv2_t *this,
eap->type = EAP_MSCHAPV2;
eap->opcode = MSCHAPV2_RESPONSE;
eap->ms_chapv2_id = this->mschapv2id;
- eap->ms_length = htons(len - 5);
+ set_ms_length(eap, len);
res = (eap_mschapv2_response_t*)eap->data;
res->value_size = RESPONSE_LEN;
@@ -725,7 +750,8 @@ static status_t process_peer_success(private_eap_mschapv2_t *this,
token += 2;
if (strlen(token) != AUTH_RESPONSE_LEN - 2)
{
- DBG1(DBG_IKE, "received invalid EAP-MS-CHAPv2 message: invalid auth string");
+ DBG1(DBG_IKE, "received invalid EAP-MS-CHAPv2 message: "
+ "invalid auth string");
goto error;
}
hex = chunk_create(token, AUTH_RESPONSE_LEN - 2);
@@ -741,7 +767,8 @@ static status_t process_peer_success(private_eap_mschapv2_t *this,
if (auth_string.ptr == NULL)
{
- DBG1(DBG_IKE, "received invalid EAP-MS-CHAPv2 message: auth string missing");
+ DBG1(DBG_IKE, "received invalid EAP-MS-CHAPv2 message: "
+ "auth string missing");
goto error;
}
@@ -751,7 +778,7 @@ static status_t process_peer_success(private_eap_mschapv2_t *this,
goto error;
}
- DBG1(DBG_IKE, "EAP-MS-CHAPv2 succeeded: '%s'", msg);
+ DBG1(DBG_IKE, "EAP-MS-CHAPv2 succeeded: '%s'", sanitize(msg));
eap = alloca(len);
eap->code = EAP_RESPONSE;
@@ -780,7 +807,6 @@ static status_t process_peer_failure(private_eap_mschapv2_t *this,
char *message, *token, *msg = NULL;
int message_len, error, retryable;
chunk_t challenge = chunk_empty;
- u_int16_t len = SHORT_HEADER_LEN;
data = in->get_data(in);
eap = (eap_mschapv2_header_t*)data.ptr;
@@ -816,7 +842,8 @@ static status_t process_peer_failure(private_eap_mschapv2_t *this,
token += 2;
if (strlen(token) != 2 * CHALLENGE_LEN)
{
- DBG1(DBG_IKE, "received invalid EAP-MS-CHAPv2 message: invalid challenge");
+ DBG1(DBG_IKE, "received invalid EAP-MS-CHAPv2 message:"
+ "invalid challenge");
goto error;
}
hex = chunk_create(token, 2 * CHALLENGE_LEN);
@@ -836,7 +863,8 @@ static status_t process_peer_failure(private_eap_mschapv2_t *this,
}
enumerator->destroy(enumerator);
- DBG1(DBG_IKE, "EAP-MS-CHAPv2 failed with error %N: '%s'", mschapv2_error_names, error, msg);
+ DBG1(DBG_IKE, "EAP-MS-CHAPv2 failed with error %N: '%s'",
+ mschapv2_error_names, error, sanitize(msg));
/**
* at this point, if the error is retryable, we MAY retry the authentication
@@ -898,8 +926,8 @@ static status_t process_peer(private_eap_mschapv2_t *this, eap_payload_t *in,
}
default:
{
- DBG1(DBG_IKE, "EAP-MS-CHAPv2 received packet with unsupported OpCode (%N)!",
- mschapv2_opcode_names, eap->opcode);
+ DBG1(DBG_IKE, "EAP-MS-CHAPv2 received packet with unsupported "
+ "OpCode (%N)!", mschapv2_opcode_names, eap->opcode);
break;
}
}
@@ -925,7 +953,8 @@ static status_t process_server_retry(private_eap_mschapv2_t *this,
* so, to clean up our state we just fail with an EAP-Failure.
* this gives an unknown error on the windows side, but is also fine
* with the standard. */
- DBG1(DBG_IKE, "EAP-MS-CHAPv2 verification failed: maximum number of retries reached");
+ DBG1(DBG_IKE, "EAP-MS-CHAPv2 verification failed: "
+ "maximum number of retries reached");
return FAILED;
}
@@ -951,7 +980,7 @@ static status_t process_server_retry(private_eap_mschapv2_t *this,
eap->type = EAP_MSCHAPV2;
eap->opcode = MSCHAPV2_FAILURE;
eap->ms_chapv2_id = this->mschapv2id++; /* increase for each retry */
- eap->ms_length = htons(len - 5);
+ set_ms_length(eap, len);
hex = chunk_to_hex(this->challenge, NULL, TRUE);
snprintf(msg, FAILURE_MESSAGE_LEN, "%s%s", FAILURE_MESSAGE, hex.ptr);
@@ -977,6 +1006,7 @@ static status_t process_server_response(private_eap_mschapv2_t *this,
identification_t *userid;
shared_key_t *shared;
int name_len;
+ char buf[256];
data = in->get_data(in);
eap = (eap_mschapv2_header_t*)data.ptr;
@@ -991,16 +1021,16 @@ static status_t process_server_response(private_eap_mschapv2_t *this,
peer_challenge = chunk_create(res->response.peer_challenge, CHALLENGE_LEN);
name_len = min(data.len - RESPONSE_PAYLOAD_LEN, 255);
- userid = identification_create_from_encoding(ID_EAP,
- chunk_create(res->name, name_len));
+ snprintf(buf, sizeof(buf), "%.*s", name_len, res->name);
+ userid = identification_create_from_string(buf);
+ DBG2(DBG_IKE, "EAP-MS-CHAPv2 username: '%Y'", userid);
username = extract_username(userid);
- DBG2(DBG_IKE, "EAP-MS-CHAPv2 username: '%.*s'", name_len, res->name);
shared = charon->credentials->get_shared(charon->credentials,
SHARED_EAP, this->server, userid);
if (shared == NULL)
{
- DBG1(DBG_IKE, "no EAP key found for hosts '%D' - '%D'",
+ DBG1(DBG_IKE, "no EAP key found for hosts '%Y' - '%Y'",
this->server, userid);
/* FIXME: windows 7 always sends the username that is first entered in
* the username box, even, if the user changes it during retries (probably
@@ -1015,7 +1045,8 @@ static status_t process_server_response(private_eap_mschapv2_t *this,
password = ascii_to_unicode(shared->get_key(shared));
shared->destroy(shared);
- if (GenerateStuff(this, this->challenge, peer_challenge, username, password) != SUCCESS)
+ if (GenerateStuff(this, this->challenge, peer_challenge,
+ username, password) != SUCCESS)
{
DBG1(DBG_IKE, "EAP-MS-CHAPv2 verification failed");
userid->destroy(userid);
@@ -1038,7 +1069,7 @@ static status_t process_server_response(private_eap_mschapv2_t *this,
eap->type = EAP_MSCHAPV2;
eap->opcode = MSCHAPV2_SUCCESS;
eap->ms_chapv2_id = this->mschapv2id;
- eap->ms_length = htons(len - 5);
+ set_ms_length(eap, len);
hex = chunk_to_hex(this->auth_response, NULL, TRUE);
snprintf(msg, AUTH_RESPONSE_LEN + sizeof(SUCCESS_MESSAGE),
@@ -1063,7 +1094,8 @@ static status_t process_server(private_eap_mschapv2_t *this, eap_payload_t *in,
if (this->identifier != in->get_identifier(in))
{
- DBG1(DBG_IKE, "received invalid EAP-MS-CHAPv2 message: unexpected identifier");
+ DBG1(DBG_IKE, "received invalid EAP-MS-CHAPv2 message: "
+ "unexpected identifier");
return FAILED;
}
@@ -1092,8 +1124,8 @@ static status_t process_server(private_eap_mschapv2_t *this, eap_payload_t *in,
}
default:
{
- DBG1(DBG_IKE, "EAP-MS-CHAPv2 received packet with unsupported OpCode (%N)!",
- mschapv2_opcode_names, eap->opcode);
+ DBG1(DBG_IKE, "EAP-MS-CHAPv2 received packet with unsupported "
+ "OpCode (%N)!", mschapv2_opcode_names, eap->opcode);
break;
}
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 13:14:30 +0000