From patchwork Thu Aug 29 15:59:26 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maurizio Lombardi X-Patchwork-Id: 11121813 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B0FDA14E5 for ; Thu, 29 Aug 2019 15:59:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 99FC520578 for ; Thu, 29 Aug 2019 15:59:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728182AbfH2P7i (ORCPT ); Thu, 29 Aug 2019 11:59:38 -0400 Received: from mx1.redhat.com ([209.132.183.28]:30515 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726283AbfH2P7h (ORCPT ); Thu, 29 Aug 2019 11:59:37 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3C514111A3CA; Thu, 29 Aug 2019 15:59:37 +0000 (UTC) Received: from manaslu.redhat.com (unknown [10.35.206.41]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0AB1851961; Thu, 29 Aug 2019 15:59:34 +0000 (UTC) From: Maurizio Lombardi To: cleech@redhat.com Cc: mchristi@redhat.com, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org Subject: [PATCH 1/4] target-iscsi: CHAP: add support to SHA1 and SHA3-256 hash functions Date: Thu, 29 Aug 2019 17:59:26 +0200 Message-Id: <20190829155929.27701-2-mlombard@redhat.com> In-Reply-To: <20190829155929.27701-1-mlombard@redhat.com> References: <20190829155929.27701-1-mlombard@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.66]); Thu, 29 Aug 2019 15:59:37 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org This patches modifies the chap_server_compute_hash() function to make it agnostic to the choice of hash algorithm that is used. It also adds support to two new hash algorithms: SHA1 and SHA3-256 Signed-off-by: Maurizio Lombardi --- drivers/target/iscsi/iscsi_target_auth.c | 135 +++++++++++++++++------ drivers/target/iscsi/iscsi_target_auth.h | 9 +- 2 files changed, 108 insertions(+), 36 deletions(-) diff --git a/drivers/target/iscsi/iscsi_target_auth.c b/drivers/target/iscsi/iscsi_target_auth.c index 51ddca2033e0..3d1e94333835 100644 --- a/drivers/target/iscsi/iscsi_target_auth.c +++ b/drivers/target/iscsi/iscsi_target_auth.c @@ -46,9 +46,22 @@ static int chap_gen_challenge( return 0; } +static int chap_test_algorithm(const char *name) +{ + struct crypto_shash *tfm; + + tfm = crypto_alloc_shash(name, 0, 0); + if (IS_ERR(tfm)) + return -1; + + crypto_free_shash(tfm); + return 0; +} + static int chap_check_algorithm(const char *a_str) { char *tmp, *orig, *token; + int r = CHAP_DIGEST_UNKNOWN; tmp = kstrdup(a_str, GFP_KERNEL); if (!tmp) { @@ -72,13 +85,33 @@ static int chap_check_algorithm(const char *a_str) if (!strncmp(token, "5", 1)) { pr_debug("Selected MD5 Algorithm\n"); - kfree(orig); - return CHAP_DIGEST_MD5; + if (chap_test_algorithm("md5") < 0) { + pr_err("failed to allocate md5 algo\n"); + continue; + } + r = CHAP_DIGEST_MD5; + goto out; + } else if (!strncmp(token, "6", 1)) { + pr_debug("Selected SHA1 Algorithm\n"); + if (chap_test_algorithm("sha1") < 0) { + pr_err("failed to allocate sha1 algo\n"); + continue; + } + r = CHAP_DIGEST_SHA; + goto out; + } else if (!strncmp(token, "7", 1)) { + pr_debug("Selected SHA3-256 Algorithm\n"); + if (chap_test_algorithm("sha3-256") < 0) { + pr_err("failed to allocate sha3-256 algo\n"); + continue; + } + r = CHAP_DIGEST_SHA3_256; + goto out; } } out: kfree(orig); - return CHAP_DIGEST_UNKNOWN; + return r; } static void chap_close(struct iscsi_conn *conn) @@ -94,7 +127,7 @@ static struct iscsi_chap *chap_server_open( char *aic_str, unsigned int *aic_len) { - int ret; + int digest_type; struct iscsi_chap *chap; if (!(auth->naf_flags & NAF_USERID_SET) || @@ -109,17 +142,19 @@ static struct iscsi_chap *chap_server_open( return NULL; chap = conn->auth_protocol; - ret = chap_check_algorithm(a_str); - switch (ret) { + digest_type = chap_check_algorithm(a_str); + switch (digest_type) { 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); + chap->digest_size = MD5_SIGNATURE_SIZE; + chap->digest_name = "md5"; + break; + case CHAP_DIGEST_SHA: + chap->digest_size = SHA_SIGNATURE_SIZE; + chap->digest_name = "sha1"; + break; + case CHAP_DIGEST_SHA3_256: + chap->digest_size = SHA3_256_SIGNATURE_SIZE; + chap->digest_name = "sha3-256"; break; case CHAP_DIGEST_UNKNOWN: default: @@ -128,6 +163,11 @@ static struct iscsi_chap *chap_server_open( return NULL; } + pr_debug("[server] Got CHAP_A=%d\n", digest_type); + *aic_len = sprintf(aic_str, "CHAP_A=%d", digest_type); + *aic_len += 1; + pr_debug("[server] Sending CHAP_A=%d\n", digest_type); + /* * Set Identifier. */ @@ -146,7 +186,7 @@ static struct iscsi_chap *chap_server_open( return chap; } -static int chap_server_compute_md5( +static int chap_server_compute_hash( struct iscsi_conn *conn, struct iscsi_node_auth *auth, char *nr_in_ptr, @@ -155,12 +195,13 @@ static int chap_server_compute_md5( { 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 type; 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 *digest = NULL; + unsigned char *response = NULL; + unsigned char *client_digest = NULL; + unsigned char *server_digest = NULL; unsigned char chap_n[MAX_CHAP_N_SIZE], chap_r[MAX_RESPONSE_LENGTH]; size_t compare_len; struct iscsi_chap *chap = conn->auth_protocol; @@ -168,13 +209,33 @@ static int chap_server_compute_md5( struct shash_desc *desc = NULL; int auth_ret = -1, ret, challenge_len; + digest = kzalloc(chap->digest_size, GFP_KERNEL); + if (!digest) { + pr_err("Unable to allocate the digest buffer\n"); + goto out; + } + + response = kzalloc(chap->digest_size * 2 + 2, GFP_KERNEL); + if (!response) { + pr_err("Unable to allocate the response buffer\n"); + goto out; + } + + client_digest = kzalloc(chap->digest_size, GFP_KERNEL); + if (!client_digest) { + pr_err("Unable to allocate the client_digest buffer\n"); + goto out; + } + + server_digest = kzalloc(chap->digest_size, GFP_KERNEL); + if (!server_digest) { + pr_err("Unable to allocate the server_digest buffer\n"); + goto out; + } + 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) { @@ -219,18 +280,18 @@ static int chap_server_compute_md5( pr_err("Could not find CHAP_R.\n"); goto out; } - if (strlen(chap_r) != MD5_SIGNATURE_SIZE * 2) { + if (strlen(chap_r) != chap->digest_size * 2) { pr_err("Malformed CHAP_R\n"); goto out; } - if (hex2bin(client_digest, chap_r, MD5_SIGNATURE_SIZE) < 0) { + if (hex2bin(client_digest, chap_r, chap->digest_size) < 0) { pr_err("Malformed CHAP_R\n"); goto out; } pr_debug("[server] Got CHAP_R=%s\n", chap_r); - tfm = crypto_alloc_shash("md5", 0, 0); + tfm = crypto_alloc_shash(chap->digest_name, 0, 0); if (IS_ERR(tfm)) { tfm = NULL; pr_err("Unable to allocate struct crypto_shash\n"); @@ -271,15 +332,15 @@ static int chap_server_compute_md5( goto out; } - bin2hex(response, server_digest, MD5_SIGNATURE_SIZE); - pr_debug("[server] MD5 Server Digest: %s\n", response); + bin2hex(response, server_digest, chap->digest_size); + pr_debug("[server] %s Server Digest: %s\n", hash_name, response); - if (memcmp(server_digest, client_digest, MD5_SIGNATURE_SIZE) != 0) { - pr_debug("[server] MD5 Digests do not match!\n\n"); + if (memcmp(server_digest, client_digest, chap->digest_size) != 0) { + pr_debug("[server] %s Digests do not match!\n\n", hash_name); goto out; } else - pr_debug("[server] MD5 Digests match, CHAP connection" - " successful.\n\n"); + pr_debug("[server] %s Digests match, CHAP connection" + " successful.\n\n", hash_name); /* * One way authentication has succeeded, return now if mutual * authentication is not enabled. @@ -393,7 +454,7 @@ static int chap_server_compute_md5( /* * Convert response from binary hex to ascii hext. */ - bin2hex(response, digest, MD5_SIGNATURE_SIZE); + bin2hex(response, digest, chap->digest_size); *nr_out_len += sprintf(nr_out_ptr + *nr_out_len, "CHAP_R=0x%s", response); *nr_out_len += 1; @@ -405,6 +466,10 @@ static int chap_server_compute_md5( crypto_free_shash(tfm); kfree(challenge); kfree(challenge_binhex); + kfree(digest); + kfree(response); + kfree(server_digest); + kfree(client_digest); return auth_ret; } @@ -419,7 +484,9 @@ static int chap_got_response( switch (chap->digest_type) { case CHAP_DIGEST_MD5: - if (chap_server_compute_md5(conn, auth, nr_in_ptr, + case CHAP_DIGEST_SHA: + case CHAP_DIGEST_SHA3_256: + if (chap_server_compute_hash(conn, auth, nr_in_ptr, nr_out_ptr, nr_out_len) < 0) return -1; return 0; diff --git a/drivers/target/iscsi/iscsi_target_auth.h b/drivers/target/iscsi/iscsi_target_auth.h index d5600ac30b53..8b10f935675a 100644 --- a/drivers/target/iscsi/iscsi_target_auth.h +++ b/drivers/target/iscsi/iscsi_target_auth.h @@ -7,13 +7,16 @@ #define CHAP_DIGEST_UNKNOWN 0 #define CHAP_DIGEST_MD5 5 #define CHAP_DIGEST_SHA 6 +#define CHAP_DIGEST_SHA3_256 7 #define CHAP_CHALLENGE_LENGTH 16 #define CHAP_CHALLENGE_STR_LEN 4096 -#define MAX_RESPONSE_LENGTH 64 /* sufficient for MD5 */ +#define MAX_RESPONSE_LENGTH 128 /* sufficient for SHA3 256 */ #define MAX_CHAP_N_SIZE 512 #define MD5_SIGNATURE_SIZE 16 /* 16 bytes in a MD5 message digest */ +#define SHA_SIGNATURE_SIZE 20 /* 20 bytes in a SHA1 message digest */ +#define SHA3_256_SIGNATURE_SIZE 32 /* 32 bytes in a SHA3 256 message digest */ #define CHAP_STAGE_CLIENT_A 1 #define CHAP_STAGE_SERVER_AIC 2 @@ -28,9 +31,11 @@ extern u32 chap_main_loop(struct iscsi_conn *, struct iscsi_node_auth *, char *, int *, int *); struct iscsi_chap { - unsigned char digest_type; unsigned char id; unsigned char challenge[CHAP_CHALLENGE_LENGTH]; + unsigned int challenge_len; + unsigned char *digest_name; + unsigned int digest_size; unsigned int authenticate_target; unsigned int chap_state; } ____cacheline_aligned;