| /* ssl/ssl_ciph.c */ |
| /* 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.] |
| */ |
| |
| #include <stdio.h> |
| #include <openssl/objects.h> |
| #include <openssl/comp.h> |
| #include "ssl_locl.h" |
| |
| #define SSL_ENC_DES_IDX 0 |
| #define SSL_ENC_3DES_IDX 1 |
| #define SSL_ENC_RC4_IDX 2 |
| #define SSL_ENC_RC2_IDX 3 |
| #define SSL_ENC_IDEA_IDX 4 |
| #define SSL_ENC_eFZA_IDX 5 |
| #define SSL_ENC_NULL_IDX 6 |
| #define SSL_ENC_NUM_IDX 7 |
| |
| static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={ |
| NULL,NULL,NULL,NULL,NULL,NULL, |
| }; |
| |
| static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL; |
| |
| #define SSL_MD_MD5_IDX 0 |
| #define SSL_MD_SHA1_IDX 1 |
| #define SSL_MD_NUM_IDX 2 |
| static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={ |
| NULL,NULL, |
| }; |
| |
| #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 |
| { |
| SSL_CIPHER *cipher; |
| int active; |
| int dead; |
| struct cipher_order_st *next,*prev; |
| } CIPHER_ORDER; |
| |
| static const SSL_CIPHER cipher_aliases[]={ |
| /* Don't include eNULL unless specifically enabled */ |
| {0,SSL_TXT_ALL, 0,SSL_ALL & ~SSL_eNULL, SSL_ALL ,0,0,0,SSL_ALL,SSL_ALL}, /* must be first */ |
| {0,SSL_TXT_kRSA,0,SSL_kRSA, 0,0,0,0,SSL_MKEY_MASK,0}, |
| {0,SSL_TXT_kDHr,0,SSL_kDHr, 0,0,0,0,SSL_MKEY_MASK,0}, |
| {0,SSL_TXT_kDHd,0,SSL_kDHd, 0,0,0,0,SSL_MKEY_MASK,0}, |
| {0,SSL_TXT_kEDH,0,SSL_kEDH, 0,0,0,0,SSL_MKEY_MASK,0}, |
| {0,SSL_TXT_kFZA,0,SSL_kFZA, 0,0,0,0,SSL_MKEY_MASK,0}, |
| {0,SSL_TXT_DH, 0,SSL_DH, 0,0,0,0,SSL_MKEY_MASK,0}, |
| {0,SSL_TXT_EDH, 0,SSL_EDH, 0,0,0,0,SSL_MKEY_MASK|SSL_AUTH_MASK,0}, |
| |
| {0,SSL_TXT_aRSA,0,SSL_aRSA, 0,0,0,0,SSL_AUTH_MASK,0}, |
| {0,SSL_TXT_aDSS,0,SSL_aDSS, 0,0,0,0,SSL_AUTH_MASK,0}, |
| {0,SSL_TXT_aFZA,0,SSL_aFZA, 0,0,0,0,SSL_AUTH_MASK,0}, |
| {0,SSL_TXT_aNULL,0,SSL_aNULL,0,0,0,0,SSL_AUTH_MASK,0}, |
| {0,SSL_TXT_aDH, 0,SSL_aDH, 0,0,0,0,SSL_AUTH_MASK,0}, |
| {0,SSL_TXT_DSS, 0,SSL_DSS, 0,0,0,0,SSL_AUTH_MASK,0}, |
| |
| {0,SSL_TXT_DES, 0,SSL_DES, 0,0,0,0,SSL_ENC_MASK,0}, |
| {0,SSL_TXT_3DES,0,SSL_3DES, 0,0,0,0,SSL_ENC_MASK,0}, |
| {0,SSL_TXT_RC4, 0,SSL_RC4, 0,0,0,0,SSL_ENC_MASK,0}, |
| {0,SSL_TXT_RC2, 0,SSL_RC2, 0,0,0,0,SSL_ENC_MASK,0}, |
| {0,SSL_TXT_IDEA,0,SSL_IDEA, 0,0,0,0,SSL_ENC_MASK,0}, |
| {0,SSL_TXT_eNULL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0}, |
| {0,SSL_TXT_eFZA,0,SSL_eFZA, 0,0,0,0,SSL_ENC_MASK,0}, |
| |
| {0,SSL_TXT_MD5, 0,SSL_MD5, 0,0,0,0,SSL_MAC_MASK,0}, |
| {0,SSL_TXT_SHA1,0,SSL_SHA1, 0,0,0,0,SSL_MAC_MASK,0}, |
| {0,SSL_TXT_SHA, 0,SSL_SHA, 0,0,0,0,SSL_MAC_MASK,0}, |
| |
| {0,SSL_TXT_NULL,0,SSL_NULL, 0,0,0,0,SSL_ENC_MASK,0}, |
| {0,SSL_TXT_RSA, 0,SSL_RSA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0}, |
| {0,SSL_TXT_ADH, 0,SSL_ADH, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0}, |
| {0,SSL_TXT_FZA, 0,SSL_FZA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK|SSL_ENC_MASK,0}, |
| |
| {0,SSL_TXT_SSLV2, 0,SSL_SSLV2, 0,0,0,0,SSL_SSL_MASK,0}, |
| {0,SSL_TXT_SSLV3, 0,SSL_SSLV3, 0,0,0,0,SSL_SSL_MASK,0}, |
| {0,SSL_TXT_TLSV1, 0,SSL_TLSV1, 0,0,0,0,SSL_SSL_MASK,0}, |
| |
| {0,SSL_TXT_EXP ,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK}, |
| {0,SSL_TXT_EXPORT,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK}, |
| {0,SSL_TXT_EXP40, 0, 0, SSL_EXP40, 0,0,0,0,SSL_STRONG_MASK}, |
| {0,SSL_TXT_EXP56, 0, 0, SSL_EXP56, 0,0,0,0,SSL_STRONG_MASK}, |
| {0,SSL_TXT_LOW, 0, 0, SSL_LOW, 0,0,0,0,SSL_STRONG_MASK}, |
| {0,SSL_TXT_MEDIUM,0, 0,SSL_MEDIUM, 0,0,0,0,SSL_STRONG_MASK}, |
| {0,SSL_TXT_HIGH, 0, 0, SSL_HIGH, 0,0,0,0,SSL_STRONG_MASK}, |
| }; |
| |
| static int init_ciphers=1; |
| |
| static void load_ciphers(void) |
| { |
| init_ciphers=0; |
| ssl_cipher_methods[SSL_ENC_DES_IDX]= |
| EVP_get_cipherbyname(SN_des_cbc); |
| ssl_cipher_methods[SSL_ENC_3DES_IDX]= |
| EVP_get_cipherbyname(SN_des_ede3_cbc); |
| ssl_cipher_methods[SSL_ENC_RC4_IDX]= |
| EVP_get_cipherbyname(SN_rc4); |
| ssl_cipher_methods[SSL_ENC_RC2_IDX]= |
| EVP_get_cipherbyname(SN_rc2_cbc); |
| ssl_cipher_methods[SSL_ENC_IDEA_IDX]= |
| EVP_get_cipherbyname(SN_idea_cbc); |
| |
| ssl_digest_methods[SSL_MD_MD5_IDX]= |
| EVP_get_digestbyname(SN_md5); |
| ssl_digest_methods[SSL_MD_SHA1_IDX]= |
| EVP_get_digestbyname(SN_sha1); |
| } |
| |
| int ssl_cipher_get_evp(SSL_SESSION *s, const EVP_CIPHER **enc, |
| const EVP_MD **md, SSL_COMP **comp) |
| { |
| int i; |
| SSL_CIPHER *c; |
| |
| c=s->cipher; |
| if (c == NULL) return(0); |
| if (comp != NULL) |
| { |
| SSL_COMP ctmp; |
| |
| if (s->compress_meth == 0) |
| *comp=NULL; |
| else if (ssl_comp_methods == NULL) |
| { |
| /* bad */ |
| *comp=NULL; |
| } |
| else |
| { |
| |
| ctmp.id=s->compress_meth; |
| i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp); |
| if (i >= 0) |
| *comp=sk_SSL_COMP_value(ssl_comp_methods,i); |
| else |
| *comp=NULL; |
| } |
| } |
| |
| if ((enc == NULL) || (md == NULL)) return(0); |
| |
| switch (c->algorithms & SSL_ENC_MASK) |
| { |
| case SSL_DES: |
| i=SSL_ENC_DES_IDX; |
| break; |
| case SSL_3DES: |
| i=SSL_ENC_3DES_IDX; |
| break; |
| case SSL_RC4: |
| i=SSL_ENC_RC4_IDX; |
| break; |
| case SSL_RC2: |
| i=SSL_ENC_RC2_IDX; |
| break; |
| case SSL_IDEA: |
| i=SSL_ENC_IDEA_IDX; |
| break; |
| case SSL_eNULL: |
| i=SSL_ENC_NULL_IDX; |
| break; |
| default: |
| i= -1; |
| break; |
| } |
| |
| if ((i < 0) || (i > SSL_ENC_NUM_IDX)) |
| *enc=NULL; |
| else |
| { |
| if (i == SSL_ENC_NULL_IDX) |
| *enc=EVP_enc_null(); |
| else |
| *enc=ssl_cipher_methods[i]; |
| } |
| |
| switch (c->algorithms & SSL_MAC_MASK) |
| { |
| case SSL_MD5: |
| i=SSL_MD_MD5_IDX; |
| break; |
| case SSL_SHA1: |
| i=SSL_MD_SHA1_IDX; |
| break; |
| default: |
| i= -1; |
| break; |
| } |
| if ((i < 0) || (i > SSL_MD_NUM_IDX)) |
| *md=NULL; |
| else |
| *md=ssl_digest_methods[i]; |
| |
| if ((*enc != NULL) && (*md != NULL)) |
| return(1); |
| else |
| 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) /* should always be true */ |
| curr->next->prev=curr->prev; |
| (*tail)->next=curr; |
| curr->prev= *tail; |
| curr->next=NULL; |
| *tail=curr; |
| } |
| |
| static unsigned long ssl_cipher_get_disabled(void) |
| { |
| unsigned long mask; |
| |
| mask = SSL_kFZA; |
| #ifdef NO_RSA |
| mask |= SSL_aRSA|SSL_kRSA; |
| #endif |
| #ifdef NO_DSA |
| mask |= SSL_aDSS; |
| #endif |
| #ifdef NO_DH |
| mask |= SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH; |
| #endif |
| |
| #ifdef SSL_FORBID_ENULL |
| mask |= SSL_eNULL; |
| #endif |
| |
| mask |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0; |
| mask |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0; |
| mask |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0; |
| mask |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0; |
| mask |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0; |
| mask |= (ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL) ? SSL_eFZA:0; |
| |
| mask |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0; |
| mask |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0; |
| |
| return(mask); |
| } |
| |
| static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method, |
| int num_of_ciphers, unsigned long mask, CIPHER_ORDER *list, |
| CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) |
| { |
| int i, list_num; |
| SSL_CIPHER *c; |
| |
| /* |
| * We have num_of_ciphers descriptions compiled in, depending on the |
| * method selected (SSLv2 and/or SSLv3, TLSv1 etc). |
| * These will later be sorted in a linked list with at most num |
| * entries. |
| */ |
| |
| /* Get the initial list of ciphers */ |
| list_num = 0; /* actual count of ciphers */ |
| for (i = 0; i < num_of_ciphers; i++) |
| { |
| c = ssl_method->get_cipher(i); |
| /* drop those that use any of that is not available */ |
| if ((c != NULL) && c->valid && !(c->algorithms & mask)) |
| { |
| list[list_num].cipher = c; |
| list[list_num].next = NULL; |
| list[list_num].prev = NULL; |
| list[list_num].active = 0; |
| list_num++; |
| /* |
| if (!sk_push(ca_list,(char *)c)) goto err; |
| */ |
| } |
| } |
| |
| /* |
| * Prepare linked list from list entries |
| */ |
| for (i = 1; i < list_num - 1; i++) |
| { |
| list[i].prev = &(list[i-1]); |
| list[i].next = &(list[i+1]); |
| } |
| if (list_num > 0) |
| { |
| (*head_p) = &(list[0]); |
| (*head_p)->prev = NULL; |
| (*head_p)->next = &(list[1]); |
| (*tail_p) = &(list[list_num - 1]); |
| (*tail_p)->prev = &(list[list_num - 2]); |
| (*tail_p)->next = NULL; |
| } |
| } |
| |
| static void ssl_cipher_collect_aliases(SSL_CIPHER **ca_list, |
| int num_of_group_aliases, unsigned long mask, |
| CIPHER_ORDER *head) |
| { |
| CIPHER_ORDER *ciph_curr; |
| SSL_CIPHER **ca_curr; |
| int i; |
| |
| /* |
| * 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 an algorithm, that must be fully |
| * supported (not match any bit in 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++) |
| { |
| if ((i == 0) || /* always fetch "ALL" */ |
| !(cipher_aliases[i].algorithms & mask)) |
| { |
| *ca_curr = (SSL_CIPHER *)(cipher_aliases + i); |
| ca_curr++; |
| } |
| } |
| |
| *ca_curr = NULL; /* end of list */ |
| } |
| |
| static void ssl_cipher_apply_rule(unsigned long algorithms, unsigned long mask, |
| unsigned long algo_strength, unsigned long mask_strength, |
| int rule, int strength_bits, CIPHER_ORDER *list, |
| CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) |
| { |
| CIPHER_ORDER *head, *tail, *curr, *curr2, *tail2; |
| SSL_CIPHER *cp; |
| unsigned long ma, ma_s; |
| |
| #ifdef CIPHER_DEBUG |
| printf("Applying rule %d with %08lx %08lx %08lx %08lx (%d)\n", |
| rule, algorithms, mask, algo_strength, mask_strength, |
| strength_bits); |
| #endif |
| |
| curr = head = *head_p; |
| curr2 = head; |
| tail2 = tail = *tail_p; |
| for (;;) |
| { |
| if ((curr == NULL) || (curr == tail2)) break; |
| curr = curr2; |
| curr2 = curr->next; |
| |
| cp = curr->cipher; |
| |
| /* |
| * Selection criteria is either the number of strength_bits |
| * or the algorithm used. |
| */ |
| if (strength_bits == -1) |
| { |
| ma = mask & cp->algorithms; |
| ma_s = mask_strength & cp->algo_strength; |
| |
| #ifdef CIPHER_DEBUG |
| printf("\nName: %s:\nAlgo = %08lx Algo_strength = %08lx\nMask = %08lx Mask_strength %08lx\n", cp->name, cp->algorithms, cp->algo_strength, mask, mask_strength); |
| printf("ma = %08lx ma_s %08lx, ma&algo=%08lx, ma_s&algos=%08lx\n", ma, ma_s, ma&algorithms, ma_s&algo_strength); |
| #endif |
| /* |
| * Select: if none of the mask bit was met from the |
| * cipher or not all of the bits were met, the |
| * selection does not apply. |
| */ |
| if (((ma == 0) && (ma_s == 0)) || |
| ((ma & algorithms) != ma) || |
| ((ma_s & algo_strength) != ma_s)) |
| continue; /* does not apply */ |
| } |
| else if (strength_bits != cp->strength_bits) |
| continue; /* does not apply */ |
| |
| #ifdef CIPHER_DEBUG |
| printf("Action = %d\n", rule); |
| #endif |
| |
| /* add the cipher if it has not been added yet. */ |
| if (rule == CIPHER_ADD) |
| { |
| if (!curr->active) |
| { |
| ll_append_tail(&head, curr, &tail); |
| curr->active = 1; |
| } |
| } |
| /* Move the added cipher to this location */ |
| else if (rule == CIPHER_ORD) |
| { |
| if (curr->active) |
| { |
| ll_append_tail(&head, curr, &tail); |
| } |
| } |
| else if (rule == CIPHER_DEL) |
| curr->active = 0; |
| else if (rule == CIPHER_KILL) |
| { |
| 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 *list, 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 = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int)); |
| if (!number_uses) |
| { |
| SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE); |
| return(0); |
| } |
| memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int)); |
| |
| /* |
| * 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, CIPHER_ORD, i, |
| list, head_p, tail_p); |
| |
| OPENSSL_free(number_uses); |
| return(1); |
| } |
| |
| static int ssl_cipher_process_rulestr(const char *rule_str, |
| CIPHER_ORDER *list, CIPHER_ORDER **head_p, |
| CIPHER_ORDER **tail_p, SSL_CIPHER **ca_list) |
| { |
| unsigned long algorithms, mask, algo_strength, mask_strength; |
| const char *l, *start, *buf; |
| int j, multi, found, rule, retval, ok, buflen; |
| char ch; |
| |
| retval = 1; |
| l = rule_str; |
| for (;;) |
| { |
| ch = *l; |
| |
| if (ch == '\0') |
| break; /* done */ |
| 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; |
| } |
| |
| algorithms = mask = algo_strength = mask_strength = 0; |
| |
| start=l; |
| for (;;) |
| { |
| ch = *l; |
| buf = l; |
| buflen = 0; |
| #ifndef CHARSET_EBCDIC |
| while ( ((ch >= 'A') && (ch <= 'Z')) || |
| ((ch >= '0') && (ch <= '9')) || |
| ((ch >= 'a') && (ch <= 'z')) || |
| (ch == '-')) |
| #else |
| while ( isalnum(ch) || (ch == '-')) |
| #endif |
| { |
| 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. |
| */ |
| SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR, |
| SSL_R_INVALID_COMMAND); |
| retval = found = 0; |
| l++; |
| break; |
| } |
| |
| if (rule == CIPHER_SPECIAL) |
| { |
| found = 0; /* unused -- avoid compiler warning */ |
| break; /* special treatment */ |
| } |
| |
| /* 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. |
| */ |
| j = found = 0; |
| while (ca_list[j]) |
| { |
| if ((ca_list[j]->name[buflen] == '\0') && |
| !strncmp(buf, ca_list[j]->name, buflen)) |
| { |
| found = 1; |
| break; |
| } |
| else |
| j++; |
| } |
| if (!found) |
| break; /* ignore this entry */ |
| |
| algorithms |= ca_list[j]->algorithms; |
| mask |= ca_list[j]->mask; |
| algo_strength |= ca_list[j]->algo_strength; |
| mask_strength |= ca_list[j]->mask_strength; |
| |
| if (!multi) break; |
| } |
| |
| /* |
| * Ok, we have the rule, now apply it |
| */ |
| if (rule == CIPHER_SPECIAL) |
| { /* special command */ |
| ok = 0; |
| if ((buflen == 8) && |
| !strncmp(buf, "STRENGTH", 8)) |
| ok = ssl_cipher_strength_sort(list, |
| head_p, tail_p); |
| else |
| SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR, |
| SSL_R_INVALID_COMMAND); |
| if (ok == 0) |
| retval = 0; |
| /* |
| * We do not support any "multi" options |
| * together with "@", so throw away the |
| * rest of the command, if any left, until |
| * end or ':' is found. |
| */ |
| while ((*l != '\0') && ITEM_SEP(*l)) |
| l++; |
| } |
| else if (found) |
| { |
| ssl_cipher_apply_rule(algorithms, mask, |
| algo_strength, mask_strength, rule, -1, |
| list, head_p, tail_p); |
| } |
| else |
| { |
| while ((*l != '\0') && ITEM_SEP(*l)) |
| l++; |
| } |
| if (*l == '\0') break; /* done */ |
| } |
| |
| return(retval); |
| } |
| |
| STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method, |
| STACK_OF(SSL_CIPHER) **cipher_list, |
| STACK_OF(SSL_CIPHER) **cipher_list_by_id, |
| const char *rule_str) |
| { |
| int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases; |
| unsigned long disabled_mask; |
| STACK_OF(SSL_CIPHER) *cipherstack; |
| const char *rule_p; |
| CIPHER_ORDER *list = NULL, *head = NULL, *tail = NULL, *curr; |
| SSL_CIPHER **ca_list = NULL; |
| |
| /* |
| * Return with error if nothing to do. |
| */ |
| if (rule_str == NULL) return(NULL); |
| |
| if (init_ciphers) load_ciphers(); |
| |
| /* |
| * To reduce the work to do we only want to process the compiled |
| * in algorithms, so we first get the mask of disabled ciphers. |
| */ |
| disabled_mask = ssl_cipher_get_disabled(); |
| |
| /* |
| * Now we have to collect the available ciphers from the compiled |
| * in ciphers. We cannot get more than the number compiled in, so |
| * it is used for allocation. |
| */ |
| num_of_ciphers = ssl_method->num_ciphers(); |
| list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers); |
| if (list == NULL) |
| { |
| SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE); |
| return(NULL); /* Failure */ |
| } |
| |
| ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, disabled_mask, |
| list, &head, &tail); |
| |
| /* |
| * We also need cipher aliases for selecting based on the rule_str. |
| * There might be two types of entries in the rule_str: 1) names |
| * of ciphers themselves 2) aliases for groups of ciphers. |
| * For 1) we need the available ciphers and for 2) the cipher |
| * groups of cipher_aliases added together in one list (otherwise |
| * we would be happy with just the cipher_aliases table). |
| */ |
| num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER); |
| num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1; |
| ca_list = |
| (SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max); |
| if (ca_list == NULL) |
| { |
| OPENSSL_free(list); |
| SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE); |
| return(NULL); /* Failure */ |
| } |
| ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mask, |
| head); |
| |
| /* |
| * If the rule_string begins with DEFAULT, apply the default rule |
| * before using the (possibly available) additional rules. |
| */ |
| ok = 1; |
| rule_p = rule_str; |
| if (strncmp(rule_str,"DEFAULT",7) == 0) |
| { |
| ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST, |
| list, &head, &tail, ca_list); |
| rule_p += 7; |
| if (*rule_p == ':') |
| rule_p++; |
| } |
| |
| if (ok && (strlen(rule_p) > 0)) |
| ok = ssl_cipher_process_rulestr(rule_p, list, &head, &tail, |
| ca_list); |
| |
| OPENSSL_free(ca_list); /* Not needed anymore */ |
| |
| if (!ok) |
| { /* Rule processing failure */ |
| OPENSSL_free(list); |
| return(NULL); |
| } |
| /* |
| * Allocate new "cipherstack" for the result, return with error |
| * if we cannot get one. |
| */ |
| if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) |
| { |
| OPENSSL_free(list); |
| return(NULL); |
| } |
| |
| /* |
| * The cipher selection for the list is done. The ciphers are added |
| * to the resulting precedence to the STACK_OF(SSL_CIPHER). |
| */ |
| for (curr = head; curr != NULL; curr = curr->next) |
| { |
| if (curr->active) |
| { |
| sk_SSL_CIPHER_push(cipherstack, curr->cipher); |
| #ifdef CIPHER_DEBUG |
| printf("<%s>\n",curr->cipher->name); |
| #endif |
| } |
| } |
| OPENSSL_free(list); /* Not needed any longer */ |
| |
| /* |
| * The following passage is a little bit odd. If pointer variables |
| * were supplied to hold STACK_OF(SSL_CIPHER) return information, |
| * the old memory pointed to is free()ed. Then, however, the |
| * cipher_list entry will be assigned just a copy of the returned |
| * cipher stack. For cipher_list_by_id a copy of the cipher stack |
| * will be created. See next comment... |
| */ |
| if (cipher_list != NULL) |
| { |
| if (*cipher_list != NULL) |
| sk_SSL_CIPHER_free(*cipher_list); |
| *cipher_list = cipherstack; |
| } |
| |
| if (cipher_list_by_id != NULL) |
| { |
| if (*cipher_list_by_id != NULL) |
| sk_SSL_CIPHER_free(*cipher_list_by_id); |
| *cipher_list_by_id = sk_SSL_CIPHER_dup(cipherstack); |
| } |
| |
| /* |
| * Now it is getting really strange. If something failed during |
| * the previous pointer assignment or if one of the pointers was |
| * not requested, the error condition is met. That might be |
| * discussable. The strange thing is however that in this case |
| * the memory "ret" pointed to is "free()ed" and hence the pointer |
| * cipher_list becomes wild. The memory reserved for |
| * cipher_list_by_id however is not "free()ed" and stays intact. |
| */ |
| if ( (cipher_list_by_id == NULL) || |
| (*cipher_list_by_id == NULL) || |
| (cipher_list == NULL) || |
| (*cipher_list == NULL)) |
| { |
| sk_SSL_CIPHER_free(cipherstack); |
| return(NULL); |
| } |
| |
| sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp); |
| |
| return(cipherstack); |
| } |
| |
| char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len) |
| { |
| int is_export,pkl,kl; |
| char *ver,*exp; |
| char *kx,*au,*enc,*mac; |
| unsigned long alg,alg2,alg_s; |
| static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n"; |
| |
| alg=cipher->algorithms; |
| alg_s=cipher->algo_strength; |
| alg2=cipher->algorithm2; |
| |
| is_export=SSL_C_IS_EXPORT(cipher); |
| pkl=SSL_C_EXPORT_PKEYLENGTH(cipher); |
| kl=SSL_C_EXPORT_KEYLENGTH(cipher); |
| exp=is_export?" export":""; |
| |
| if (alg & SSL_SSLV2) |
| ver="SSLv2"; |
| else if (alg & SSL_SSLV3) |
| ver="SSLv3"; |
| else |
| ver="unknown"; |
| |
| switch (alg&SSL_MKEY_MASK) |
| { |
| case SSL_kRSA: |
| kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA"; |
| break; |
| case SSL_kDHr: |
| kx="DH/RSA"; |
| break; |
| case SSL_kDHd: |
| kx="DH/DSS"; |
| break; |
| case SSL_kFZA: |
| kx="Fortezza"; |
| break; |
| case SSL_kEDH: |
| kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH"; |
| break; |
| default: |
| kx="unknown"; |
| } |
| |
| switch (alg&SSL_AUTH_MASK) |
| { |
| case SSL_aRSA: |
| au="RSA"; |
| break; |
| case SSL_aDSS: |
| au="DSS"; |
| break; |
| case SSL_aDH: |
| au="DH"; |
| break; |
| case SSL_aFZA: |
| case SSL_aNULL: |
| au="None"; |
| break; |
| default: |
| au="unknown"; |
| break; |
| } |
| |
| switch (alg&SSL_ENC_MASK) |
| { |
| case SSL_DES: |
| enc=(is_export && kl == 5)?"DES(40)":"DES(56)"; |
| break; |
| case SSL_3DES: |
| enc="3DES(168)"; |
| break; |
| case SSL_RC4: |
| enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)") |
| :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)"); |
| break; |
| case SSL_RC2: |
| enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)"; |
| break; |
| case SSL_IDEA: |
| enc="IDEA(128)"; |
| break; |
| case SSL_eFZA: |
| enc="Fortezza"; |
| break; |
| case SSL_eNULL: |
| enc="None"; |
| break; |
| default: |
| enc="unknown"; |
| break; |
| } |
| |
| switch (alg&SSL_MAC_MASK) |
| { |
| case SSL_MD5: |
| mac="MD5"; |
| break; |
| case SSL_SHA1: |
| mac="SHA1"; |
| break; |
| default: |
| mac="unknown"; |
| break; |
| } |
| |
| if (buf == NULL) |
| { |
| len=128; |
| buf=OPENSSL_malloc(len); |
| if (buf == NULL) return("OPENSSL_malloc Error"); |
| } |
| else if (len < 128) |
| return("Buffer too small"); |
| |
| BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp); |
| return(buf); |
| } |
| |
| char *SSL_CIPHER_get_version(SSL_CIPHER *c) |
| { |
| int i; |
| |
| if (c == NULL) return("(NONE)"); |
| i=(int)(c->id>>24L); |
| if (i == 3) |
| return("TLSv1/SSLv3"); |
| else if (i == 2) |
| return("SSLv2"); |
| else |
| return("unknown"); |
| } |
| |
| /* return the actual cipher being used */ |
| const char *SSL_CIPHER_get_name(SSL_CIPHER *c) |
| { |
| if (c != NULL) |
| return(c->name); |
| return("(NONE)"); |
| } |
| |
| /* number of bits for symmetric cipher */ |
| int SSL_CIPHER_get_bits(SSL_CIPHER *c, int *alg_bits) |
| { |
| int ret=0; |
| |
| if (c != NULL) |
| { |
| if (alg_bits != NULL) *alg_bits = c->alg_bits; |
| ret = c->strength_bits; |
| } |
| return(ret); |
| } |
| |
| SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n) |
| { |
| SSL_COMP *ctmp; |
| int i,nn; |
| |
| if ((n == 0) || (sk == NULL)) return(NULL); |
| nn=sk_SSL_COMP_num(sk); |
| for (i=0; i<nn; i++) |
| { |
| ctmp=sk_SSL_COMP_value(sk,i); |
| if (ctmp->id == n) |
| return(ctmp); |
| } |
| return(NULL); |
| } |
| |
| static int sk_comp_cmp(const SSL_COMP * const *a, |
| const SSL_COMP * const *b) |
| { |
| return((*a)->id-(*b)->id); |
| } |
| |
| STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void) |
| { |
| return(ssl_comp_methods); |
| } |
| |
| int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm) |
| { |
| SSL_COMP *comp; |
| STACK_OF(SSL_COMP) *sk; |
| |
| comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP)); |
| comp->id=id; |
| comp->method=cm; |
| if (ssl_comp_methods == NULL) |
| sk=ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp); |
| else |
| sk=ssl_comp_methods; |
| if ((sk == NULL) || !sk_SSL_COMP_push(sk,comp)) |
| { |
| SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE); |
| return(0); |
| } |
| else |
| return(1); |
| } |
| |