mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Bart Van Assche](/assets/img/avatar_default.png)
Remove superfluous #include directives from the include/target/*.h files. Add missing #include directives to other *.h and *.c files. Use forward declarations for structures where possible. This change reduces the build time for make M=drivers/target on my laptop from 27.1s to 18.7s or by about 30%. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
476 lines
12 KiB
C
476 lines
12 KiB
C
/*******************************************************************************
|
|
* This file houses the main functions for the iSCSI CHAP support
|
|
*
|
|
* (c) Copyright 2007-2013 Datera, Inc.
|
|
*
|
|
* Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but 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.
|
|
******************************************************************************/
|
|
|
|
#include <crypto/hash.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/err.h>
|
|
#include <linux/random.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <target/iscsi/iscsi_target_core.h>
|
|
#include "iscsi_target_nego.h"
|
|
#include "iscsi_target_auth.h"
|
|
|
|
static int chap_string_to_hex(unsigned char *dst, unsigned char *src, int len)
|
|
{
|
|
int j = DIV_ROUND_UP(len, 2), rc;
|
|
|
|
rc = hex2bin(dst, src, j);
|
|
if (rc < 0)
|
|
pr_debug("CHAP string contains non hex digit symbols\n");
|
|
|
|
dst[j] = '\0';
|
|
return j;
|
|
}
|
|
|
|
static void chap_binaryhex_to_asciihex(char *dst, char *src, int src_len)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < src_len; i++) {
|
|
sprintf(&dst[i*2], "%02x", (int) src[i] & 0xff);
|
|
}
|
|
}
|
|
|
|
static void chap_gen_challenge(
|
|
struct iscsi_conn *conn,
|
|
int caller,
|
|
char *c_str,
|
|
unsigned int *c_len)
|
|
{
|
|
unsigned char challenge_asciihex[CHAP_CHALLENGE_LENGTH * 2 + 1];
|
|
struct iscsi_chap *chap = conn->auth_protocol;
|
|
|
|
memset(challenge_asciihex, 0, CHAP_CHALLENGE_LENGTH * 2 + 1);
|
|
|
|
get_random_bytes(chap->challenge, CHAP_CHALLENGE_LENGTH);
|
|
chap_binaryhex_to_asciihex(challenge_asciihex, chap->challenge,
|
|
CHAP_CHALLENGE_LENGTH);
|
|
/*
|
|
* Set CHAP_C, and copy the generated challenge into c_str.
|
|
*/
|
|
*c_len += sprintf(c_str + *c_len, "CHAP_C=0x%s", challenge_asciihex);
|
|
*c_len += 1;
|
|
|
|
pr_debug("[%s] Sending CHAP_C=0x%s\n\n", (caller) ? "server" : "client",
|
|
challenge_asciihex);
|
|
}
|
|
|
|
static int chap_check_algorithm(const char *a_str)
|
|
{
|
|
char *tmp, *orig, *token;
|
|
|
|
tmp = kstrdup(a_str, GFP_KERNEL);
|
|
if (!tmp) {
|
|
pr_err("Memory allocation failed for CHAP_A temporary buffer\n");
|
|
return CHAP_DIGEST_UNKNOWN;
|
|
}
|
|
orig = tmp;
|
|
|
|
token = strsep(&tmp, "=");
|
|
if (!token)
|
|
goto out;
|
|
|
|
if (strcmp(token, "CHAP_A")) {
|
|
pr_err("Unable to locate CHAP_A key\n");
|
|
goto out;
|
|
}
|
|
while (token) {
|
|
token = strsep(&tmp, ",");
|
|
if (!token)
|
|
goto out;
|
|
|
|
if (!strncmp(token, "5", 1)) {
|
|
pr_debug("Selected MD5 Algorithm\n");
|
|
kfree(orig);
|
|
return CHAP_DIGEST_MD5;
|
|
}
|
|
}
|
|
out:
|
|
kfree(orig);
|
|
return CHAP_DIGEST_UNKNOWN;
|
|
}
|
|
|
|
static struct iscsi_chap *chap_server_open(
|
|
struct iscsi_conn *conn,
|
|
struct iscsi_node_auth *auth,
|
|
const char *a_str,
|
|
char *aic_str,
|
|
unsigned int *aic_len)
|
|
{
|
|
int ret;
|
|
struct iscsi_chap *chap;
|
|
|
|
if (!(auth->naf_flags & NAF_USERID_SET) ||
|
|
!(auth->naf_flags & NAF_PASSWORD_SET)) {
|
|
pr_err("CHAP user or password not set for"
|
|
" Initiator ACL\n");
|
|
return NULL;
|
|
}
|
|
|
|
conn->auth_protocol = kzalloc(sizeof(struct iscsi_chap), GFP_KERNEL);
|
|
if (!conn->auth_protocol)
|
|
return NULL;
|
|
|
|
chap = conn->auth_protocol;
|
|
ret = chap_check_algorithm(a_str);
|
|
switch (ret) {
|
|
case CHAP_DIGEST_MD5:
|
|
pr_debug("[server] Got CHAP_A=5\n");
|
|
/*
|
|
* Send back CHAP_A set to MD5.
|
|
*/
|
|
*aic_len = sprintf(aic_str, "CHAP_A=5");
|
|
*aic_len += 1;
|
|
chap->digest_type = CHAP_DIGEST_MD5;
|
|
pr_debug("[server] Sending CHAP_A=%d\n", chap->digest_type);
|
|
break;
|
|
case CHAP_DIGEST_UNKNOWN:
|
|
default:
|
|
pr_err("Unsupported CHAP_A value\n");
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Set Identifier.
|
|
*/
|
|
chap->id = conn->tpg->tpg_chap_id++;
|
|
*aic_len += sprintf(aic_str + *aic_len, "CHAP_I=%d", chap->id);
|
|
*aic_len += 1;
|
|
pr_debug("[server] Sending CHAP_I=%d\n", chap->id);
|
|
/*
|
|
* Generate Challenge.
|
|
*/
|
|
chap_gen_challenge(conn, 1, aic_str, aic_len);
|
|
|
|
return chap;
|
|
}
|
|
|
|
static void chap_close(struct iscsi_conn *conn)
|
|
{
|
|
kfree(conn->auth_protocol);
|
|
conn->auth_protocol = NULL;
|
|
}
|
|
|
|
static int chap_server_compute_md5(
|
|
struct iscsi_conn *conn,
|
|
struct iscsi_node_auth *auth,
|
|
char *nr_in_ptr,
|
|
char *nr_out_ptr,
|
|
unsigned int *nr_out_len)
|
|
{
|
|
unsigned long id;
|
|
unsigned char id_as_uchar;
|
|
unsigned char digest[MD5_SIGNATURE_SIZE];
|
|
unsigned char type, response[MD5_SIGNATURE_SIZE * 2 + 2];
|
|
unsigned char identifier[10], *challenge = NULL;
|
|
unsigned char *challenge_binhex = NULL;
|
|
unsigned char client_digest[MD5_SIGNATURE_SIZE];
|
|
unsigned char server_digest[MD5_SIGNATURE_SIZE];
|
|
unsigned char chap_n[MAX_CHAP_N_SIZE], chap_r[MAX_RESPONSE_LENGTH];
|
|
size_t compare_len;
|
|
struct iscsi_chap *chap = conn->auth_protocol;
|
|
struct crypto_shash *tfm = NULL;
|
|
struct shash_desc *desc = NULL;
|
|
int auth_ret = -1, ret, challenge_len;
|
|
|
|
memset(identifier, 0, 10);
|
|
memset(chap_n, 0, MAX_CHAP_N_SIZE);
|
|
memset(chap_r, 0, MAX_RESPONSE_LENGTH);
|
|
memset(digest, 0, MD5_SIGNATURE_SIZE);
|
|
memset(response, 0, MD5_SIGNATURE_SIZE * 2 + 2);
|
|
memset(client_digest, 0, MD5_SIGNATURE_SIZE);
|
|
memset(server_digest, 0, MD5_SIGNATURE_SIZE);
|
|
|
|
challenge = kzalloc(CHAP_CHALLENGE_STR_LEN, GFP_KERNEL);
|
|
if (!challenge) {
|
|
pr_err("Unable to allocate challenge buffer\n");
|
|
goto out;
|
|
}
|
|
|
|
challenge_binhex = kzalloc(CHAP_CHALLENGE_STR_LEN, GFP_KERNEL);
|
|
if (!challenge_binhex) {
|
|
pr_err("Unable to allocate challenge_binhex buffer\n");
|
|
goto out;
|
|
}
|
|
/*
|
|
* Extract CHAP_N.
|
|
*/
|
|
if (extract_param(nr_in_ptr, "CHAP_N", MAX_CHAP_N_SIZE, chap_n,
|
|
&type) < 0) {
|
|
pr_err("Could not find CHAP_N.\n");
|
|
goto out;
|
|
}
|
|
if (type == HEX) {
|
|
pr_err("Could not find CHAP_N.\n");
|
|
goto out;
|
|
}
|
|
|
|
/* Include the terminating NULL in the compare */
|
|
compare_len = strlen(auth->userid) + 1;
|
|
if (strncmp(chap_n, auth->userid, compare_len) != 0) {
|
|
pr_err("CHAP_N values do not match!\n");
|
|
goto out;
|
|
}
|
|
pr_debug("[server] Got CHAP_N=%s\n", chap_n);
|
|
/*
|
|
* Extract CHAP_R.
|
|
*/
|
|
if (extract_param(nr_in_ptr, "CHAP_R", MAX_RESPONSE_LENGTH, chap_r,
|
|
&type) < 0) {
|
|
pr_err("Could not find CHAP_R.\n");
|
|
goto out;
|
|
}
|
|
if (type != HEX) {
|
|
pr_err("Could not find CHAP_R.\n");
|
|
goto out;
|
|
}
|
|
|
|
pr_debug("[server] Got CHAP_R=%s\n", chap_r);
|
|
chap_string_to_hex(client_digest, chap_r, strlen(chap_r));
|
|
|
|
tfm = crypto_alloc_shash("md5", 0, 0);
|
|
if (IS_ERR(tfm)) {
|
|
tfm = NULL;
|
|
pr_err("Unable to allocate struct crypto_shash\n");
|
|
goto out;
|
|
}
|
|
|
|
desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(tfm), GFP_KERNEL);
|
|
if (!desc) {
|
|
pr_err("Unable to allocate struct shash_desc\n");
|
|
goto out;
|
|
}
|
|
|
|
desc->tfm = tfm;
|
|
desc->flags = 0;
|
|
|
|
ret = crypto_shash_init(desc);
|
|
if (ret < 0) {
|
|
pr_err("crypto_shash_init() failed\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = crypto_shash_update(desc, &chap->id, 1);
|
|
if (ret < 0) {
|
|
pr_err("crypto_shash_update() failed for id\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = crypto_shash_update(desc, (char *)&auth->password,
|
|
strlen(auth->password));
|
|
if (ret < 0) {
|
|
pr_err("crypto_shash_update() failed for password\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = crypto_shash_finup(desc, chap->challenge,
|
|
CHAP_CHALLENGE_LENGTH, server_digest);
|
|
if (ret < 0) {
|
|
pr_err("crypto_shash_finup() failed for challenge\n");
|
|
goto out;
|
|
}
|
|
|
|
chap_binaryhex_to_asciihex(response, server_digest, MD5_SIGNATURE_SIZE);
|
|
pr_debug("[server] MD5 Server Digest: %s\n", response);
|
|
|
|
if (memcmp(server_digest, client_digest, MD5_SIGNATURE_SIZE) != 0) {
|
|
pr_debug("[server] MD5 Digests do not match!\n\n");
|
|
goto out;
|
|
} else
|
|
pr_debug("[server] MD5 Digests match, CHAP connection"
|
|
" successful.\n\n");
|
|
/*
|
|
* One way authentication has succeeded, return now if mutual
|
|
* authentication is not enabled.
|
|
*/
|
|
if (!auth->authenticate_target) {
|
|
auth_ret = 0;
|
|
goto out;
|
|
}
|
|
/*
|
|
* Get CHAP_I.
|
|
*/
|
|
if (extract_param(nr_in_ptr, "CHAP_I", 10, identifier, &type) < 0) {
|
|
pr_err("Could not find CHAP_I.\n");
|
|
goto out;
|
|
}
|
|
|
|
if (type == HEX)
|
|
ret = kstrtoul(&identifier[2], 0, &id);
|
|
else
|
|
ret = kstrtoul(identifier, 0, &id);
|
|
|
|
if (ret < 0) {
|
|
pr_err("kstrtoul() failed for CHAP identifier: %d\n", ret);
|
|
goto out;
|
|
}
|
|
if (id > 255) {
|
|
pr_err("chap identifier: %lu greater than 255\n", id);
|
|
goto out;
|
|
}
|
|
/*
|
|
* RFC 1994 says Identifier is no more than octet (8 bits).
|
|
*/
|
|
pr_debug("[server] Got CHAP_I=%lu\n", id);
|
|
/*
|
|
* Get CHAP_C.
|
|
*/
|
|
if (extract_param(nr_in_ptr, "CHAP_C", CHAP_CHALLENGE_STR_LEN,
|
|
challenge, &type) < 0) {
|
|
pr_err("Could not find CHAP_C.\n");
|
|
goto out;
|
|
}
|
|
|
|
if (type != HEX) {
|
|
pr_err("Could not find CHAP_C.\n");
|
|
goto out;
|
|
}
|
|
pr_debug("[server] Got CHAP_C=%s\n", challenge);
|
|
challenge_len = chap_string_to_hex(challenge_binhex, challenge,
|
|
strlen(challenge));
|
|
if (!challenge_len) {
|
|
pr_err("Unable to convert incoming challenge\n");
|
|
goto out;
|
|
}
|
|
if (challenge_len > 1024) {
|
|
pr_err("CHAP_C exceeds maximum binary size of 1024 bytes\n");
|
|
goto out;
|
|
}
|
|
/*
|
|
* During mutual authentication, the CHAP_C generated by the
|
|
* initiator must not match the original CHAP_C generated by
|
|
* the target.
|
|
*/
|
|
if (!memcmp(challenge_binhex, chap->challenge, CHAP_CHALLENGE_LENGTH)) {
|
|
pr_err("initiator CHAP_C matches target CHAP_C, failing"
|
|
" login attempt\n");
|
|
goto out;
|
|
}
|
|
/*
|
|
* Generate CHAP_N and CHAP_R for mutual authentication.
|
|
*/
|
|
ret = crypto_shash_init(desc);
|
|
if (ret < 0) {
|
|
pr_err("crypto_shash_init() failed\n");
|
|
goto out;
|
|
}
|
|
|
|
/* To handle both endiannesses */
|
|
id_as_uchar = id;
|
|
ret = crypto_shash_update(desc, &id_as_uchar, 1);
|
|
if (ret < 0) {
|
|
pr_err("crypto_shash_update() failed for id\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = crypto_shash_update(desc, auth->password_mutual,
|
|
strlen(auth->password_mutual));
|
|
if (ret < 0) {
|
|
pr_err("crypto_shash_update() failed for"
|
|
" password_mutual\n");
|
|
goto out;
|
|
}
|
|
/*
|
|
* Convert received challenge to binary hex.
|
|
*/
|
|
ret = crypto_shash_finup(desc, challenge_binhex, challenge_len,
|
|
digest);
|
|
if (ret < 0) {
|
|
pr_err("crypto_shash_finup() failed for ma challenge\n");
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Generate CHAP_N and CHAP_R.
|
|
*/
|
|
*nr_out_len = sprintf(nr_out_ptr, "CHAP_N=%s", auth->userid_mutual);
|
|
*nr_out_len += 1;
|
|
pr_debug("[server] Sending CHAP_N=%s\n", auth->userid_mutual);
|
|
/*
|
|
* Convert response from binary hex to ascii hext.
|
|
*/
|
|
chap_binaryhex_to_asciihex(response, digest, MD5_SIGNATURE_SIZE);
|
|
*nr_out_len += sprintf(nr_out_ptr + *nr_out_len, "CHAP_R=0x%s",
|
|
response);
|
|
*nr_out_len += 1;
|
|
pr_debug("[server] Sending CHAP_R=0x%s\n", response);
|
|
auth_ret = 0;
|
|
out:
|
|
kzfree(desc);
|
|
crypto_free_shash(tfm);
|
|
kfree(challenge);
|
|
kfree(challenge_binhex);
|
|
return auth_ret;
|
|
}
|
|
|
|
static int chap_got_response(
|
|
struct iscsi_conn *conn,
|
|
struct iscsi_node_auth *auth,
|
|
char *nr_in_ptr,
|
|
char *nr_out_ptr,
|
|
unsigned int *nr_out_len)
|
|
{
|
|
struct iscsi_chap *chap = conn->auth_protocol;
|
|
|
|
switch (chap->digest_type) {
|
|
case CHAP_DIGEST_MD5:
|
|
if (chap_server_compute_md5(conn, auth, nr_in_ptr,
|
|
nr_out_ptr, nr_out_len) < 0)
|
|
return -1;
|
|
return 0;
|
|
default:
|
|
pr_err("Unknown CHAP digest type %d!\n",
|
|
chap->digest_type);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
u32 chap_main_loop(
|
|
struct iscsi_conn *conn,
|
|
struct iscsi_node_auth *auth,
|
|
char *in_text,
|
|
char *out_text,
|
|
int *in_len,
|
|
int *out_len)
|
|
{
|
|
struct iscsi_chap *chap = conn->auth_protocol;
|
|
|
|
if (!chap) {
|
|
chap = chap_server_open(conn, auth, in_text, out_text, out_len);
|
|
if (!chap)
|
|
return 2;
|
|
chap->chap_state = CHAP_STAGE_SERVER_AIC;
|
|
return 0;
|
|
} else if (chap->chap_state == CHAP_STAGE_SERVER_AIC) {
|
|
convert_null_to_semi(in_text, *in_len);
|
|
if (chap_got_response(conn, auth, in_text, out_text,
|
|
out_len) < 0) {
|
|
chap_close(conn);
|
|
return 2;
|
|
}
|
|
if (auth->authenticate_target)
|
|
chap->chap_state = CHAP_STAGE_SERVER_NR;
|
|
else
|
|
*out_len = 0;
|
|
chap_close(conn);
|
|
return 1;
|
|
}
|
|
|
|
return 2;
|
|
}
|