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ssl_ciph.c
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/* $OpenBSD: ssl_ciph.c,v 1.149 2024/08/31 12:46:55 jsing Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* ====================================================================
* Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* ====================================================================
* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
* ECC cipher suite support in OpenSSL originally developed by
* SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
*/
/* ====================================================================
* Copyright 2005 Nokia. All rights reserved.
*
* The portions of the attached software ("Contribution") is developed by
* Nokia Corporation and is licensed pursuant to the OpenSSL open source
* license.
*
* The Contribution, originally written by Mika Kousa and Pasi Eronen of
* Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
* support (see RFC 4279) to OpenSSL.
*
* No patent licenses or other rights except those expressly stated in
* the OpenSSL open source license shall be deemed granted or received
* expressly, by implication, estoppel, or otherwise.
*
* No assurances are provided by Nokia that the Contribution does not
* infringe the patent or other intellectual property rights of any third
* party or that the license provides you with all the necessary rights
* to make use of the Contribution.
*
* THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
* ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
* SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
* OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
* OTHERWISE.
*/
#include <stdio.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/opensslconf.h>
#include "ssl_local.h"
#define CIPHER_ADD 1
#define CIPHER_KILL 2
#define CIPHER_DEL 3
#define CIPHER_ORD 4
#define CIPHER_SPECIAL 5
typedef struct cipher_order_st {
const SSL_CIPHER *cipher;
int active;
int dead;
struct cipher_order_st *next, *prev;
} CIPHER_ORDER;
static const SSL_CIPHER cipher_aliases[] = {
/* "ALL" doesn't include eNULL (must be specifically enabled) */
{
.name = SSL_TXT_ALL,
.algorithm_enc = ~SSL_eNULL,
},
/* "COMPLEMENTOFALL" */
{
.name = SSL_TXT_CMPALL,
.algorithm_enc = SSL_eNULL,
},
/*
* "COMPLEMENTOFDEFAULT"
* (does *not* include ciphersuites not found in ALL!)
*/
{
.name = SSL_TXT_CMPDEF,
.algorithm_mkey = SSL_kDHE|SSL_kECDHE,
.algorithm_auth = SSL_aNULL,
.algorithm_enc = ~SSL_eNULL,
},
/*
* key exchange aliases
* (some of those using only a single bit here combine multiple key
* exchange algs according to the RFCs, e.g. kEDH combines DHE_DSS
* and DHE_RSA)
*/
{
.name = SSL_TXT_kRSA,
.algorithm_mkey = SSL_kRSA,
},
{
.name = SSL_TXT_kEDH,
.algorithm_mkey = SSL_kDHE,
},
{
.name = SSL_TXT_DH,
.algorithm_mkey = SSL_kDHE,
},
{
.name = SSL_TXT_kEECDH,
.algorithm_mkey = SSL_kECDHE,
},
{
.name = SSL_TXT_ECDH,
.algorithm_mkey = SSL_kECDHE,
},
/* server authentication aliases */
{
.name = SSL_TXT_aRSA,
.algorithm_auth = SSL_aRSA,
},
{
.name = SSL_TXT_aDSS,
.algorithm_auth = SSL_aDSS,
},
{
.name = SSL_TXT_DSS,
.algorithm_auth = SSL_aDSS,
},
{
.name = SSL_TXT_aNULL,
.algorithm_auth = SSL_aNULL,
},
{
.name = SSL_TXT_aECDSA,
.algorithm_auth = SSL_aECDSA,
},
{
.name = SSL_TXT_ECDSA,
.algorithm_auth = SSL_aECDSA,
},
/* aliases combining key exchange and server authentication */
{
.name = SSL_TXT_DHE,
.algorithm_mkey = SSL_kDHE,
.algorithm_auth = ~SSL_aNULL,
},
{
.name = SSL_TXT_EDH,
.algorithm_mkey = SSL_kDHE,
.algorithm_auth = ~SSL_aNULL,
},
{
.name = SSL_TXT_ECDHE,
.algorithm_mkey = SSL_kECDHE,
.algorithm_auth = ~SSL_aNULL,
},
{
.name = SSL_TXT_EECDH,
.algorithm_mkey = SSL_kECDHE,
.algorithm_auth = ~SSL_aNULL,
},
{
.name = SSL_TXT_NULL,
.algorithm_enc = SSL_eNULL,
},
{
.name = SSL_TXT_RSA,
.algorithm_mkey = SSL_kRSA,
.algorithm_auth = SSL_aRSA,
},
{
.name = SSL_TXT_ADH,
.algorithm_mkey = SSL_kDHE,
.algorithm_auth = SSL_aNULL,
},
{
.name = SSL_TXT_AECDH,
.algorithm_mkey = SSL_kECDHE,
.algorithm_auth = SSL_aNULL,
},
/* symmetric encryption aliases */
{
.name = SSL_TXT_3DES,
.algorithm_enc = SSL_3DES,
},
{
.name = SSL_TXT_RC4,
.algorithm_enc = SSL_RC4,
},
{
.name = SSL_TXT_eNULL,
.algorithm_enc = SSL_eNULL,
},
{
.name = SSL_TXT_AES128,
.algorithm_enc = SSL_AES128|SSL_AES128GCM,
},
{
.name = SSL_TXT_AES256,
.algorithm_enc = SSL_AES256|SSL_AES256GCM,
},
{
.name = SSL_TXT_AES,
.algorithm_enc = SSL_AES,
},
{
.name = SSL_TXT_AES_GCM,
.algorithm_enc = SSL_AES128GCM|SSL_AES256GCM,
},
{
.name = SSL_TXT_CAMELLIA128,
.algorithm_enc = SSL_CAMELLIA128,
},
{
.name = SSL_TXT_CAMELLIA256,
.algorithm_enc = SSL_CAMELLIA256,
},
{
.name = SSL_TXT_CAMELLIA,
.algorithm_enc = SSL_CAMELLIA128|SSL_CAMELLIA256,
},
{
.name = SSL_TXT_CHACHA20,
.algorithm_enc = SSL_CHACHA20POLY1305,
},
/* MAC aliases */
{
.name = SSL_TXT_AEAD,
.algorithm_mac = SSL_AEAD,
},
{
.name = SSL_TXT_MD5,
.algorithm_mac = SSL_MD5,
},
{
.name = SSL_TXT_SHA1,
.algorithm_mac = SSL_SHA1,
},
{
.name = SSL_TXT_SHA,
.algorithm_mac = SSL_SHA1,
},
{
.name = SSL_TXT_SHA256,
.algorithm_mac = SSL_SHA256,
},
{
.name = SSL_TXT_SHA384,
.algorithm_mac = SSL_SHA384,
},
/* protocol version aliases */
{
.name = SSL_TXT_SSLV3,
.algorithm_ssl = SSL_SSLV3,
},
{
.name = SSL_TXT_TLSV1,
.algorithm_ssl = SSL_TLSV1,
},
{
.name = SSL_TXT_TLSV1_2,
.algorithm_ssl = SSL_TLSV1_2,
},
{
.name = SSL_TXT_TLSV1_3,
.algorithm_ssl = SSL_TLSV1_3,
},
/* cipher suite aliases */
#ifdef LIBRESSL_HAS_TLS1_3
{
.value = 0x1301,
.name = "TLS_AES_128_GCM_SHA256",
.algorithm_ssl = SSL_TLSV1_3,
},
{
.value = 0x1302,
.name = "TLS_AES_256_GCM_SHA384",
.algorithm_ssl = SSL_TLSV1_3,
},
{
.value = 0x1303,
.name = "TLS_CHACHA20_POLY1305_SHA256",
.algorithm_ssl = SSL_TLSV1_3,
},
#endif
/* strength classes */
{
.name = SSL_TXT_LOW,
.algo_strength = SSL_LOW,
},
{
.name = SSL_TXT_MEDIUM,
.algo_strength = SSL_MEDIUM,
},
{
.name = SSL_TXT_HIGH,
.algo_strength = SSL_HIGH,
},
};
int
ssl_cipher_get_evp(SSL *s, const EVP_CIPHER **enc, const EVP_MD **md,
int *mac_pkey_type, int *mac_secret_size)
{
const SSL_CIPHER *cipher;
*enc = NULL;
*md = NULL;
*mac_pkey_type = NID_undef;
*mac_secret_size = 0;
if ((cipher = s->s3->hs.cipher) == NULL)
return 0;
/*
* This function does not handle EVP_AEAD.
* See ssl_cipher_get_evp_aead instead.
*/
if (cipher->algorithm_mac & SSL_AEAD)
return 0;
switch (cipher->algorithm_enc) {
case SSL_3DES:
*enc = EVP_des_ede3_cbc();
break;
case SSL_RC4:
*enc = EVP_rc4();
break;
case SSL_eNULL:
*enc = EVP_enc_null();
break;
case SSL_AES128:
*enc = EVP_aes_128_cbc();
break;
case SSL_AES256:
*enc = EVP_aes_256_cbc();
break;
case SSL_CAMELLIA128:
*enc = EVP_camellia_128_cbc();
break;
case SSL_CAMELLIA256:
*enc = EVP_camellia_256_cbc();
break;
}
switch (cipher->algorithm_mac) {
case SSL_MD5:
*md = EVP_md5();
break;
case SSL_SHA1:
*md = EVP_sha1();
break;
case SSL_SHA256:
*md = EVP_sha256();
break;
case SSL_SHA384:
*md = EVP_sha384();
break;
}
if (*enc == NULL || *md == NULL)
return 0;
/* XXX remove these from ssl_cipher_get_evp? */
/*
* EVP_CIPH_FLAG_AEAD_CIPHER and EVP_CIPH_GCM_MODE ciphers are not
* supported via EVP_CIPHER (they should be using EVP_AEAD instead).
*/
if (EVP_CIPHER_flags(*enc) & EVP_CIPH_FLAG_AEAD_CIPHER)
return 0;
if (EVP_CIPHER_mode(*enc) == EVP_CIPH_GCM_MODE)
return 0;
*mac_pkey_type = EVP_PKEY_HMAC;
*mac_secret_size = EVP_MD_size(*md);
return 1;
}
/*
* ssl_cipher_get_evp_aead sets aead to point to the correct EVP_AEAD object
* for s->cipher. It returns 1 on success and 0 on error.
*/
int
ssl_cipher_get_evp_aead(SSL *s, const EVP_AEAD **aead)
{
const SSL_CIPHER *cipher;
*aead = NULL;
if ((cipher = s->s3->hs.cipher) == NULL)
return 0;
if ((cipher->algorithm_mac & SSL_AEAD) == 0)
return 0;
switch (cipher->algorithm_enc) {
case SSL_AES128GCM:
*aead = EVP_aead_aes_128_gcm();
return 1;
case SSL_AES256GCM:
*aead = EVP_aead_aes_256_gcm();
return 1;
case SSL_CHACHA20POLY1305:
*aead = EVP_aead_chacha20_poly1305();
return 1;
default:
break;
}
return 0;
}
int
ssl_get_handshake_evp_md(SSL *s, const EVP_MD **md)
{
const SSL_CIPHER *cipher;
*md = NULL;
if ((cipher = s->s3->hs.cipher) == NULL)
return 0;
switch (cipher->algorithm2 & SSL_HANDSHAKE_MAC_MASK) {
case SSL_HANDSHAKE_MAC_SHA256:
*md = EVP_sha256();
return 1;
case SSL_HANDSHAKE_MAC_SHA384:
*md = EVP_sha384();
return 1;
default:
break;
}
return 0;
}
#define ITEM_SEP(a) \
(((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
static void
ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
CIPHER_ORDER **tail)
{
if (curr == *tail)
return;
if (curr == *head)
*head = curr->next;
if (curr->prev != NULL)
curr->prev->next = curr->next;
if (curr->next != NULL)
curr->next->prev = curr->prev;
(*tail)->next = curr;
curr->prev= *tail;
curr->next = NULL;
*tail = curr;
}
static void
ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr,
CIPHER_ORDER **tail)
{
if (curr == *head)
return;
if (curr == *tail)
*tail = curr->prev;
if (curr->next != NULL)
curr->next->prev = curr->prev;
if (curr->prev != NULL)
curr->prev->next = curr->next;
(*head)->prev = curr;
curr->next= *head;
curr->prev = NULL;
*head = curr;
}
static void
ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method, int num_of_ciphers,
unsigned long disabled_mkey, unsigned long disabled_auth,
unsigned long disabled_enc, unsigned long disabled_mac,
unsigned long disabled_ssl, CIPHER_ORDER *co_list,
CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
{
int i, co_list_num;
const SSL_CIPHER *c;
/*
* We have num_of_ciphers descriptions compiled in, depending on the
* method selected (SSLv3, TLSv1, etc). These will later be sorted in
* a linked list with at most num entries.
*/
/*
* Get the initial list of ciphers, iterating backwards over the
* cipher list - the list is ordered by cipher value and we currently
* hope that ciphers with higher cipher values are preferable...
*/
co_list_num = 0; /* actual count of ciphers */
for (i = num_of_ciphers - 1; i >= 0; i--) {
c = ssl3_get_cipher_by_index(i);
/*
* Drop any invalid ciphers and any which use unavailable
* algorithms.
*/
if ((c != NULL) &&
!(c->algorithm_mkey & disabled_mkey) &&
!(c->algorithm_auth & disabled_auth) &&
!(c->algorithm_enc & disabled_enc) &&
!(c->algorithm_mac & disabled_mac) &&
!(c->algorithm_ssl & disabled_ssl)) {
co_list[co_list_num].cipher = c;
co_list[co_list_num].next = NULL;
co_list[co_list_num].prev = NULL;
co_list[co_list_num].active = 0;
co_list_num++;
}
}
/*
* Prepare linked list from list entries
*/
if (co_list_num > 0) {
co_list[0].prev = NULL;
if (co_list_num > 1) {
co_list[0].next = &co_list[1];
for (i = 1; i < co_list_num - 1; i++) {
co_list[i].prev = &co_list[i - 1];
co_list[i].next = &co_list[i + 1];
}
co_list[co_list_num - 1].prev =
&co_list[co_list_num - 2];
}
co_list[co_list_num - 1].next = NULL;
*head_p = &co_list[0];
*tail_p = &co_list[co_list_num - 1];
}
}
static void
ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list, int num_of_group_aliases,
unsigned long disabled_mkey, unsigned long disabled_auth,
unsigned long disabled_enc, unsigned long disabled_mac,
unsigned long disabled_ssl, CIPHER_ORDER *head)
{
CIPHER_ORDER *ciph_curr;
const SSL_CIPHER **ca_curr;
int i;
unsigned long mask_mkey = ~disabled_mkey;
unsigned long mask_auth = ~disabled_auth;
unsigned long mask_enc = ~disabled_enc;
unsigned long mask_mac = ~disabled_mac;
unsigned long mask_ssl = ~disabled_ssl;
/*
* First, add the real ciphers as already collected
*/
ciph_curr = head;
ca_curr = ca_list;
while (ciph_curr != NULL) {
*ca_curr = ciph_curr->cipher;
ca_curr++;
ciph_curr = ciph_curr->next;
}
/*
* Now we add the available ones from the cipher_aliases[] table.
* They represent either one or more algorithms, some of which
* in any affected category must be supported (set in enabled_mask),
* or represent a cipher strength value (will be added in any case because algorithms=0).
*/
for (i = 0; i < num_of_group_aliases; i++) {
unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey;
unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth;
unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc;
unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac;
unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl;
if (algorithm_mkey)
if ((algorithm_mkey & mask_mkey) == 0)
continue;
if (algorithm_auth)
if ((algorithm_auth & mask_auth) == 0)
continue;
if (algorithm_enc)
if ((algorithm_enc & mask_enc) == 0)
continue;
if (algorithm_mac)
if ((algorithm_mac & mask_mac) == 0)
continue;
if (algorithm_ssl)
if ((algorithm_ssl & mask_ssl) == 0)
continue;
*ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
ca_curr++;
}
*ca_curr = NULL; /* end of list */
}
static void
ssl_cipher_apply_rule(uint16_t cipher_value, unsigned long alg_mkey,
unsigned long alg_auth, unsigned long alg_enc, unsigned long alg_mac,
unsigned long alg_ssl, unsigned long algo_strength, int rule,
int strength_bits, CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
{
CIPHER_ORDER *head, *tail, *curr, *next, *last;
const SSL_CIPHER *cp;
int reverse = 0;
if (rule == CIPHER_DEL)
reverse = 1; /* needed to maintain sorting between currently deleted ciphers */
head = *head_p;
tail = *tail_p;
if (reverse) {
next = tail;
last = head;
} else {
next = head;
last = tail;
}
curr = NULL;
for (;;) {
if (curr == last)
break;
curr = next;
next = reverse ? curr->prev : curr->next;
cp = curr->cipher;
if (cipher_value != 0 && cp->value != cipher_value)
continue;
/*
* Selection criteria is either the value of strength_bits
* or the algorithms used.
*/
if (strength_bits >= 0) {
if (strength_bits != cp->strength_bits)
continue;
} else {
if (alg_mkey && !(alg_mkey & cp->algorithm_mkey))
continue;
if (alg_auth && !(alg_auth & cp->algorithm_auth))
continue;
if (alg_enc && !(alg_enc & cp->algorithm_enc))
continue;
if (alg_mac && !(alg_mac & cp->algorithm_mac))
continue;
if (alg_ssl && !(alg_ssl & cp->algorithm_ssl))
continue;
if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength))
continue;
}
/* add the cipher if it has not been added yet. */
if (rule == CIPHER_ADD) {
/* reverse == 0 */
if (!curr->active) {
ll_append_tail(&head, curr, &tail);
curr->active = 1;
}
}
/* Move the added cipher to this location */
else if (rule == CIPHER_ORD) {
/* reverse == 0 */
if (curr->active) {
ll_append_tail(&head, curr, &tail);
}
} else if (rule == CIPHER_DEL) {
/* reverse == 1 */
if (curr->active) {
/* most recently deleted ciphersuites get best positions
* for any future CIPHER_ADD (note that the CIPHER_DEL loop
* works in reverse to maintain the order) */
ll_append_head(&head, curr, &tail);
curr->active = 0;
}
} else if (rule == CIPHER_KILL) {
/* reverse == 0 */
if (head == curr)
head = curr->next;
else
curr->prev->next = curr->next;
if (tail == curr)
tail = curr->prev;
curr->active = 0;
if (curr->next != NULL)
curr->next->prev = curr->prev;
if (curr->prev != NULL)
curr->prev->next = curr->next;
curr->next = NULL;
curr->prev = NULL;
}
}
*head_p = head;
*tail_p = tail;
}
static int
ssl_cipher_strength_sort(CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
{
int max_strength_bits, i, *number_uses;
CIPHER_ORDER *curr;
/*
* This routine sorts the ciphers with descending strength. The sorting
* must keep the pre-sorted sequence, so we apply the normal sorting
* routine as '+' movement to the end of the list.
*/
max_strength_bits = 0;
curr = *head_p;
while (curr != NULL) {
if (curr->active &&
(curr->cipher->strength_bits > max_strength_bits))
max_strength_bits = curr->cipher->strength_bits;
curr = curr->next;
}
number_uses = calloc((max_strength_bits + 1), sizeof(int));
if (!number_uses) {
SSLerrorx(ERR_R_MALLOC_FAILURE);
return (0);
}
/*
* Now find the strength_bits values actually used
*/
curr = *head_p;
while (curr != NULL) {
if (curr->active)
number_uses[curr->cipher->strength_bits]++;
curr = curr->next;
}
/*
* Go through the list of used strength_bits values in descending
* order.
*/
for (i = max_strength_bits; i >= 0; i--)
if (number_uses[i] > 0)
ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p);
free(number_uses);
return (1);
}
static int
ssl_cipher_process_rulestr(const char *rule_str, CIPHER_ORDER **head_p,
CIPHER_ORDER **tail_p, const SSL_CIPHER **ca_list, SSL_CERT *cert,
int *tls13_seen)
{
unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl;
unsigned long algo_strength;
int j, multi, found, rule, retval, ok, buflen;
uint16_t cipher_value = 0;
const char *l, *buf;
char ch;
*tls13_seen = 0;
retval = 1;
l = rule_str;
for (;;) {
ch = *l;
if (ch == '\0')
break;
if (ch == '-') {
rule = CIPHER_DEL;
l++;
} else if (ch == '+') {
rule = CIPHER_ORD;
l++;
} else if (ch == '!') {
rule = CIPHER_KILL;
l++;
} else if (ch == '@') {
rule = CIPHER_SPECIAL;
l++;
} else {
rule = CIPHER_ADD;
}
if (ITEM_SEP(ch)) {
l++;
continue;
}
alg_mkey = 0;
alg_auth = 0;
alg_enc = 0;
alg_mac = 0;
alg_ssl = 0;
algo_strength = 0;
for (;;) {
ch = *l;
buf = l;
buflen = 0;
while (((ch >= 'A') && (ch <= 'Z')) ||
((ch >= '0') && (ch <= '9')) ||
((ch >= 'a') && (ch <= 'z')) ||
(ch == '-') || (ch == '.') ||
(ch == '_') || (ch == '=')) {
ch = *(++l);
buflen++;
}
if (buflen == 0) {
/*
* We hit something we cannot deal with,
* it is no command or separator nor
* alphanumeric, so we call this an error.
*/
SSLerrorx(SSL_R_INVALID_COMMAND);
return 0;
}
if (rule == CIPHER_SPECIAL) {
/* unused -- avoid compiler warning */
found = 0;
/* special treatment */
break;
}
/* check for multi-part specification */
if (ch == '+') {
multi = 1;
l++;
} else
multi = 0;
/*
* Now search for the cipher alias in the ca_list.
* Be careful with the strncmp, because the "buflen"
* limitation will make the rule "ADH:SOME" and the
* cipher "ADH-MY-CIPHER" look like a match for
* buflen=3. So additionally check whether the cipher
* name found has the correct length. We can save a
* strlen() call: just checking for the '\0' at the
* right place is sufficient, we have to strncmp()
* anyway (we cannot use strcmp(), because buf is not
* '\0' terminated.)
*/
j = found = 0;
cipher_value = 0;
while (ca_list[j]) {
if (!strncmp(buf, ca_list[j]->name, buflen) &&
(ca_list[j]->name[buflen] == '\0')) {
found = 1;
break;
} else
j++;
}
if (!found)
break; /* ignore this entry */
if (ca_list[j]->algorithm_mkey) {
if (alg_mkey) {
alg_mkey &= ca_list[j]->algorithm_mkey;
if (!alg_mkey) {
found = 0;
break;
}
} else
alg_mkey = ca_list[j]->algorithm_mkey;
}
if (ca_list[j]->algorithm_auth) {
if (alg_auth) {
alg_auth &= ca_list[j]->algorithm_auth;
if (!alg_auth) {
found = 0;
break;
}
} else
alg_auth = ca_list[j]->algorithm_auth;
}
if (ca_list[j]->algorithm_enc) {
if (alg_enc) {
alg_enc &= ca_list[j]->algorithm_enc;