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strongswan/src/pluto/alg_info.c

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/*
* Algorithm info parsing and creation functions
* Author: JuanJo Ciarlante <jjo-ipsec@mendoza.gov.ar>
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*
* RCSID $Id$
*/
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <freeswan.h>
#include <ipsec_policy.h>
#include <pfkeyv2.h>
#include "alg_info.h"
#include "constants.h"
#ifndef NO_PLUTO
#include "defs.h"
#include "log.h"
#include "whack.h"
#include "sha1.h"
#include "md5.h"
#include "crypto.h"
#include "kernel_alg.h"
#include "ike_alg.h"
#else
/*
* macros/functions for compilation without pluto (eg: spi for manual conns)
*/
#include <assert.h>
#define passert(x) assert(x)
extern int debug; /* eg: spi.c */
#define DBG(cond, action) { if (debug) { action ; } }
#define DBG_log(x, args...) fprintf(stderr, x "\n" , ##args);
#define RC_LOG_SERIOUS
#define loglog(x, args...) fprintf(stderr, ##args);
#define alloc_thing(thing, name) alloc_bytes(sizeof (thing), name)
void * alloc_bytes(size_t size, const char *name) {
void *p=malloc(size);
if (p == NULL)
fprintf(stderr, "unable to malloc %lu bytes for %s",
(unsigned long) size, name);
memset(p, '\0', size);
return p;
}
#define pfreeany(ptr) free(ptr)
#endif /* NO_PLUTO */
/*
* sadb/ESP aa attrib converters
*/
int
alg_info_esp_aa2sadb(int auth)
{
int sadb_aalg = 0;
switch(auth) {
case AUTH_ALGORITHM_HMAC_MD5:
case AUTH_ALGORITHM_HMAC_SHA1:
sadb_aalg = auth + 1;
break;
case AUTH_ALGORITHM_HMAC_SHA2_256:
case AUTH_ALGORITHM_HMAC_SHA2_384:
case AUTH_ALGORITHM_HMAC_SHA2_512:
case AUTH_ALGORITHM_HMAC_RIPEMD:
sadb_aalg = auth;
break;
default:
/* loose ... */
sadb_aalg = auth;
}
return sadb_aalg;
}
int /* __attribute__ ((unused)) */
alg_info_esp_sadb2aa(int sadb_aalg)
{
int auth = 0;
switch(sadb_aalg) {
case SADB_AALG_MD5HMAC:
case SADB_AALG_SHA1HMAC:
auth = sadb_aalg - 1;
break;
/* since they are the same ... :) */
case AUTH_ALGORITHM_HMAC_SHA2_256:
case AUTH_ALGORITHM_HMAC_SHA2_384:
case AUTH_ALGORITHM_HMAC_SHA2_512:
case AUTH_ALGORITHM_HMAC_RIPEMD:
auth = sadb_aalg;
break;
default:
/* loose ... */
auth = sadb_aalg;
}
return auth;
}
/*
* Search enum_name array with in prefixed uppercase
*/
static int
enum_search_prefix (enum_names *ed, const char *prefix, const char *str, int strlen)
{
char buf[64];
char *ptr;
int ret;
int len = sizeof(buf) - 1; /* reserve space for final \0 */
for (ptr = buf; *prefix; *ptr++ = *prefix++, len--);
while (strlen-- && len-- && *str) *ptr++ = toupper(*str++);
*ptr = 0;
DBG(DBG_CRYPT,
DBG_log("enum_search_prefix () calling enum_search(%p, \"%s\")"
, ed, buf)
)
ret = enum_search(ed, buf);
return ret;
}
/*
* Search enum_name array with in prefixed and postfixed uppercase
*/
static int
enum_search_ppfix (enum_names *ed, const char *prefix, const char *postfix, const char *str, int strlen)
{
char buf[64];
char *ptr;
int ret;
int len = sizeof(buf) - 1; /* reserve space for final \0 */
for (ptr = buf; *prefix; *ptr++ = *prefix++, len--);
while (strlen-- && len-- && *str) *ptr++ = toupper(*str++);
while (len-- && *postfix) *ptr++ = *postfix++;
*ptr = 0;
DBG(DBG_CRYPT,
DBG_log("enum_search_ppfixi () calling enum_search(%p, \"%s\")"
, ed, buf)
)
ret = enum_search(ed, buf);
return ret;
}
/*
* Search esp_transformid_names for a match, eg:
* "3des" <=> "ESP_3DES"
*/
#define ESP_MAGIC_ID 0x00ffff01
static int
ealg_getbyname_esp(const char *const str, int len)
{
if (!str || !*str)
{
return -1;
}
/* leave special case for eg: "id248" string */
if (streq("id", str))
{
return ESP_MAGIC_ID;
}
return enum_search_prefix(&esp_transformid_names, "ESP_", str, len);
}
/*
* Search auth_alg_names for a match, eg:
* "md5" <=> "AUTH_ALGORITHM_HMAC_MD5"
*/
static int
aalg_getbyname_esp(const char *const str, int len)
{
int ret;
unsigned num;
if (!str || !*str)
return -1;
/* interpret 'SHA' as 'SHA1' */
if (strncasecmp("SHA", str, len) == 0)
return AUTH_ALGORITHM_HMAC_SHA1;
/* interpret 'AESXCBC' as 'AES_XCBC_MAC' */
if (strncasecmp("AESXCBC", str, len) == 0)
return AUTH_ALGORITHM_AES_XCBC_MAC;
ret = enum_search_prefix(&auth_alg_names,"AUTH_ALGORITHM_HMAC_", str ,len);
if (ret >= 0)
return ret;
ret = enum_search_prefix(&auth_alg_names,"AUTH_ALGORITHM_", str, len);
if (ret >= 0)
return ret;
sscanf(str, "id%d%n", &ret, &num);
return (ret >= 0 && num != strlen(str))? -1 : ret;
}
static int
modp_getbyname_esp(const char *const str, int len)
{
int ret;
if (!str || !*str)
return -1;
ret = enum_search_prefix(&oakley_group_names,"OAKLEY_GROUP_", str, len);
if (ret >= 0)
return ret;
ret = enum_search_ppfix(&oakley_group_names, "OAKLEY_GROUP_", " (extension)", str, len);
return ret;
}
void
alg_info_free(struct alg_info *alg_info)
{
pfreeany(alg_info);
}
/*
* Raw add routine: only checks for no duplicates
*/
static void
__alg_info_esp_add (struct alg_info_esp *alg_info, int ealg_id, unsigned ek_bits, int aalg_id, unsigned ak_bits)
{
struct esp_info *esp_info=alg_info->esp;
unsigned cnt = alg_info->alg_info_cnt, i;
/* check for overflows */
passert(cnt < elemsof(alg_info->esp));
/* dont add duplicates */
for (i = 0; i < cnt; i++)
{
if (esp_info[i].esp_ealg_id == ealg_id
&& (!ek_bits || esp_info[i].esp_ealg_keylen == ek_bits)
&& esp_info[i].esp_aalg_id == aalg_id
&& (!ak_bits || esp_info[i].esp_aalg_keylen == ak_bits))
return;
}
esp_info[cnt].esp_ealg_id = ealg_id;
esp_info[cnt].esp_ealg_keylen = ek_bits;
esp_info[cnt].esp_aalg_id = aalg_id;
esp_info[cnt].esp_aalg_keylen = ak_bits;
/* sadb values */
esp_info[cnt].encryptalg = ealg_id;
esp_info[cnt].authalg = alg_info_esp_aa2sadb(aalg_id);
alg_info->alg_info_cnt++;
DBG(DBG_CRYPT,
DBG_log("__alg_info_esp_add() ealg=%d aalg=%d cnt=%d"
, ealg_id, aalg_id, alg_info->alg_info_cnt)
)
}
/*
* Add ESP alg info _with_ logic (policy):
*/
static void
alg_info_esp_add (struct alg_info *alg_info, int ealg_id, int ek_bits, int aalg_id, int ak_bits)
{
/* Policy: default to 3DES */
if (ealg_id == 0)
ealg_id = ESP_3DES;
if (ealg_id > 0)
{
#ifndef NO_PLUTO
if (aalg_id > 0)
#else
/* Allow no auth for manual conns (from spi.c) */
if (aalg_id >= 0)
#endif
__alg_info_esp_add((struct alg_info_esp *)alg_info,
ealg_id, ek_bits,
aalg_id, ak_bits);
else
{
/* Policy: default to MD5 and SHA1 */
__alg_info_esp_add((struct alg_info_esp *)alg_info,
ealg_id, ek_bits,
AUTH_ALGORITHM_HMAC_MD5, ak_bits);
__alg_info_esp_add((struct alg_info_esp *)alg_info,
ealg_id, ek_bits,
AUTH_ALGORITHM_HMAC_SHA1, ak_bits);
}
}
}
#ifndef NO_PLUTO
/**************************************
*
* IKE alg
*
*************************************/
/*
* Search oakley_enc_names for a match, eg:
* "3des_cbc" <=> "OAKLEY_3DES_CBC"
*/
static int
ealg_getbyname_ike(const char *const str, int len)
{
int ret;
if (!str || !*str)
return -1;
ret = enum_search_prefix(&oakley_enc_names,"OAKLEY_", str, len);
if (ret >= 0)
return ret;
ret = enum_search_ppfix(&oakley_enc_names, "OAKLEY_", "_CBC", str, len);
return ret;
}
/*
* Search oakley_hash_names for a match, eg:
* "md5" <=> "OAKLEY_MD5"
*/
static int
aalg_getbyname_ike(const char *const str, int len)
{
int ret;
unsigned num;
if (!str || !*str)
return -1;
/* interpret 'SHA1' as 'SHA' */
if (strncasecmp("SHA1", str, len) == 0)
return enum_search(&oakley_hash_names, "OAKLEY_SHA");
ret = enum_search_prefix(&oakley_hash_names,"OAKLEY_", str, len);
if (ret >= 0)
return ret;
sscanf(str, "id%d%n", &ret, &num);
return (ret >=0 && num != strlen(str))? -1 : ret;
}
/*
* Search oakley_group_names for a match, eg:
* "modp1024" <=> "OAKLEY_GROUP_MODP1024"
*/
static int
modp_getbyname_ike(const char *const str, int len)
{
int ret;
if (!str || !*str)
return -1;
ret = enum_search_prefix(&oakley_group_names,"OAKLEY_GROUP_", str, len);
if (ret >= 0)
return ret;
ret = enum_search_ppfix(&oakley_group_names, "OAKLEY_GROUP_", " (extension)", str, len);
return ret;
}
static void
__alg_info_ike_add (struct alg_info_ike *alg_info, int ealg_id, unsigned ek_bits, int aalg_id, unsigned ak_bits, int modp_id)
{
struct ike_info *ike_info = alg_info->ike;
unsigned cnt = alg_info->alg_info_cnt;
unsigned i;
/* check for overflows */
passert(cnt < elemsof(alg_info->ike));
/* dont add duplicates */
for (i = 0;i < cnt; i++)
{
if (ike_info[i].ike_ealg == ealg_id
&& (!ek_bits || ike_info[i].ike_eklen == ek_bits)
&& ike_info[i].ike_halg == aalg_id
&& (!ak_bits || ike_info[i].ike_hklen == ak_bits)
&& ike_info[i].ike_modp==modp_id)
return;
}
ike_info[cnt].ike_ealg = ealg_id;
ike_info[cnt].ike_eklen = ek_bits;
ike_info[cnt].ike_halg = aalg_id;
ike_info[cnt].ike_hklen = ak_bits;
ike_info[cnt].ike_modp = modp_id;
alg_info->alg_info_cnt++;
DBG(DBG_CRYPT,
DBG_log("__alg_info_ike_add() ealg=%d aalg=%d modp_id=%d, cnt=%d"
, ealg_id, aalg_id, modp_id
, alg_info->alg_info_cnt)
)
}
/*
* Proposals will be built by looping over default_ike_groups array and
* merging alg_info (ike_info) contents
*/
static int default_ike_groups[] = {
OAKLEY_GROUP_MODP1536,
OAKLEY_GROUP_MODP1024
};
/*
* Add IKE alg info _with_ logic (policy):
*/
static void
alg_info_ike_add (struct alg_info *alg_info, int ealg_id, int ek_bits, int aalg_id, int ak_bits, int modp_id)
{
int i = 0;
int n_groups = elemsof(default_ike_groups);
/* if specified modp_id avoid loop over default_ike_groups */
if (modp_id)
{
n_groups=0;
goto in_loop;
}
for (; n_groups--; i++)
{
modp_id = default_ike_groups[i];
in_loop:
/* Policy: default to 3DES */
if (ealg_id == 0)
ealg_id = OAKLEY_3DES_CBC;
if (ealg_id > 0)
{
if (aalg_id > 0)
__alg_info_ike_add((struct alg_info_ike *)alg_info,
ealg_id, ek_bits,
aalg_id, ak_bits,
modp_id);
else
{
/* Policy: default to MD5 and SHA */
__alg_info_ike_add((struct alg_info_ike *)alg_info,
ealg_id, ek_bits,
OAKLEY_MD5, ak_bits,
modp_id);
__alg_info_ike_add((struct alg_info_ike *)alg_info,
ealg_id, ek_bits,
OAKLEY_SHA, ak_bits,
modp_id);
}
}
}
}
#endif /* NO_PLUTO */
/*
* Creates a new alg_info by parsing passed string
*/
enum parser_state_esp {
ST_INI,
ST_EA, /* encrypt algo */
ST_EA_END,
ST_EK, /* enc. key length */
ST_EK_END,
ST_AA, /* auth algo */
ST_AA_END,
ST_AK, /* auth. key length */
ST_AK_END,
ST_MODP, /* modp spec */
ST_FLAG_STRICT,
ST_END,
ST_EOF,
ST_ERR
};
static const char *parser_state_esp_names[] = {
"ST_INI",
"ST_EA",
"ST_EA_END",
"ST_EK",
"ST_EK_END",
"ST_AA",
"ST_AA_END",
"ST_AK",
"ST_AK_END",
"ST_MOPD",
"ST_FLAG_STRICT",
"ST_END",
"ST_EOF",
"ST_ERR"
};
static const char*
parser_state_name_esp(enum parser_state_esp state)
{
return parser_state_esp_names[state];
}
/* XXX:jjo to implement different parser for ESP and IKE */
struct parser_context {
unsigned state, old_state;
unsigned protoid;
char ealg_buf[16];
char aalg_buf[16];
char modp_buf[16];
int (*ealg_getbyname)(const char *const str, int len);
int (*aalg_getbyname)(const char *const str, int len);
int (*modp_getbyname)(const char *const str, int len);
char *ealg_str;
char *aalg_str;
char *modp_str;
int eklen;
int aklen;
int ch;
const char *err;
};
static inline void
parser_set_state(struct parser_context *p_ctx, enum parser_state_esp state)
{
if (state != p_ctx->state)
{
p_ctx->old_state = p_ctx->state;
p_ctx->state = state;
}
}
static int
parser_machine(struct parser_context *p_ctx)
{
int ch = p_ctx->ch;
/* special 'absolute' cases */
p_ctx->err = "No error.";
/* chars that end algo strings */
switch (ch){
case 0: /* end-of-string */
case '!': /* flag as strict algo list */
case ',': /* algo string separator */
switch (p_ctx->state) {
case ST_EA:
case ST_EK:
case ST_AA:
case ST_AK:
case ST_MODP:
case ST_FLAG_STRICT:
{
enum parser_state_esp next_state = 0;
switch (ch) {
case 0:
next_state = ST_EOF;
break;
case ',':
next_state = ST_END;
break;
case '!':
next_state = ST_FLAG_STRICT;
break;
}
/* ch? parser_set_state(p_ctx, ST_END) : parser_set_state(p_ctx, ST_EOF) ; */
parser_set_state(p_ctx, next_state);
goto out;
}
default:
p_ctx->err = "String ended with invalid char";
goto err;
}
}
re_eval:
switch (p_ctx->state) {
case ST_INI:
if (isspace(ch))
break;
if (isalnum(ch))
{
*(p_ctx->ealg_str++) = ch;
parser_set_state(p_ctx, ST_EA);
break;
}
p_ctx->err = "No alphanum. char initially found";
goto err;
case ST_EA:
if (isalpha(ch) || ch == '_')
{
*(p_ctx->ealg_str++) = ch;
break;
}
if (isdigit(ch))
{
/* bravely switch to enc keylen */
*(p_ctx->ealg_str) = 0;
parser_set_state(p_ctx, ST_EK);
goto re_eval;
}
if (ch == '-')
{
*(p_ctx->ealg_str) = 0;
parser_set_state(p_ctx, ST_EA_END);
break;
}
p_ctx->err = "No valid char found after enc alg string";
goto err;
case ST_EA_END:
if (isdigit(ch))
{
/* bravely switch to enc keylen */
parser_set_state(p_ctx, ST_EK);
goto re_eval;
}
if (isalpha(ch))
{
parser_set_state(p_ctx, ST_AA);
goto re_eval;
}
p_ctx->err = "No alphanum char found after enc alg separator";
goto err;
case ST_EK:
if (ch == '-')
{
parser_set_state(p_ctx, ST_EK_END);
break;
}
if (isdigit(ch))
{
p_ctx->eklen = p_ctx->eklen*10 + ch - '0';
break;
}
p_ctx->err = "Non digit or valid separator found while reading enc keylen";
goto err;
case ST_EK_END:
if (isalpha(ch))
{
parser_set_state(p_ctx, ST_AA);
goto re_eval;
}
p_ctx->err = "Non alpha char found after enc keylen end separator";
goto err;
case ST_AA:
if (ch == '-')
{
*(p_ctx->aalg_str++) = 0;
parser_set_state(p_ctx, ST_AA_END);
break;
}
if (isalnum(ch) || ch == '_')
{
*(p_ctx->aalg_str++) = ch;
break;
}
p_ctx->err = "Non alphanum or valid separator found in auth string";
goto err;
case ST_AA_END:
if (isdigit(ch))
{
parser_set_state(p_ctx, ST_AK);
goto re_eval;
}
/* Only allow modpXXXX string if we have a modp_getbyname method */
if ((p_ctx->modp_getbyname) && isalpha(ch))
{
parser_set_state(p_ctx, ST_MODP);
goto re_eval;
}
p_ctx->err = "Non initial digit found for auth keylen";
goto err;
case ST_AK:
if (ch=='-')
{
parser_set_state(p_ctx, ST_AK_END);
break;
}
if (isdigit(ch))
{
p_ctx->aklen = p_ctx->aklen*10 + ch - '0';
break;
}
p_ctx->err = "Non digit found for auth keylen";
goto err;
case ST_AK_END:
/* Only allow modpXXXX string if we have a modp_getbyname method */
if ((p_ctx->modp_getbyname) && isalpha(ch))
{
parser_set_state(p_ctx, ST_MODP);
goto re_eval;
}
p_ctx->err = "Non alpha char found after auth keylen";
goto err;
case ST_MODP:
if (isalnum(ch))
{
*(p_ctx->modp_str++) = ch;
break;
}
p_ctx->err = "Non alphanum char found after in modp string";
goto err;
case ST_FLAG_STRICT:
if (ch == 0)
parser_set_state(p_ctx, ST_END);
p_ctx->err = "Flags character(s) must be at end of whole string";
goto err;
/* XXX */
case ST_END:
case ST_EOF:
case ST_ERR:
break;
/* XXX */
}
out:
return p_ctx->state;
err:
parser_set_state(p_ctx, ST_ERR);
return ST_ERR;
}
/*
* Must be called for each "new" char, with new
* character in ctx.ch
*/
static void
parser_init(struct parser_context *p_ctx, unsigned protoid)
{
memset(p_ctx, 0, sizeof (*p_ctx));
p_ctx->protoid = protoid; /* XXX: jjo */
p_ctx->protoid = PROTO_IPSEC_ESP;
p_ctx->ealg_str = p_ctx->ealg_buf;
p_ctx->aalg_str = p_ctx->aalg_buf;
p_ctx->modp_str = p_ctx->modp_buf;
p_ctx->state = ST_INI;
switch (protoid) {
#ifndef NO_PLUTO
case PROTO_ISAKMP:
p_ctx->ealg_getbyname = ealg_getbyname_ike;
p_ctx->aalg_getbyname = aalg_getbyname_ike;
p_ctx->modp_getbyname = modp_getbyname_ike;
break;
#endif
case PROTO_IPSEC_ESP:
p_ctx->ealg_getbyname = ealg_getbyname_esp;
p_ctx->aalg_getbyname = aalg_getbyname_esp;
break;
}
}
static int
parser_alg_info_add(struct parser_context *p_ctx, struct alg_info *alg_info)
{
int ealg_id = 0;
int aalg_id = 0;
int modp_id = 0;
#ifndef NO_PLUTO
const struct oakley_group_desc *gd;
#endif
if (*p_ctx->ealg_buf)
{
ealg_id = p_ctx->ealg_getbyname(p_ctx->ealg_buf, strlen(p_ctx->ealg_buf));
if (ealg_id == ESP_MAGIC_ID)
{
ealg_id = p_ctx->eklen;
p_ctx->eklen = 0;
}
if (ealg_id < 0)
{
p_ctx->err = "enc_alg not found";
return -1;
}
DBG(DBG_CRYPT,
DBG_log("parser_alg_info_add() ealg_getbyname(\"%s\")=%d"
, p_ctx->ealg_buf
, ealg_id)
)
}
if (*p_ctx->aalg_buf)
{
aalg_id = p_ctx->aalg_getbyname(p_ctx->aalg_buf, strlen(p_ctx->aalg_buf));
if (aalg_id < 0)
{
p_ctx->err = "hash_alg not found";
return -1;
}
DBG(DBG_CRYPT,
DBG_log("parser_alg_info_add() aalg_getbyname(\"%s\")=%d"
, p_ctx->aalg_buf
, aalg_id)
)
}
if (p_ctx->modp_getbyname && *p_ctx->modp_buf)
{
modp_id = p_ctx->modp_getbyname(p_ctx->modp_buf, strlen(p_ctx->modp_buf));
if (modp_id < 0)
{
p_ctx->err = "modp group not found";
return -1;
}
DBG(DBG_CRYPT,
DBG_log("parser_alg_info_add() modp_getbyname(\"%s\")=%d"
, p_ctx->modp_buf
, modp_id)
)
}
switch (alg_info->alg_info_protoid) {
case PROTO_IPSEC_ESP:
alg_info_esp_add(alg_info,
ealg_id, p_ctx->eklen,
aalg_id, p_ctx->aklen);
break;
#ifndef NO_PLUTO
case PROTO_ISAKMP:
if (modp_id && !(gd = lookup_group(modp_id)))
{
p_ctx->err = "found modp group id, but not supported";
return -1;
}
alg_info_ike_add(alg_info,
ealg_id, p_ctx->eklen,
aalg_id, p_ctx->aklen,
modp_id);
break;
#endif
default:
return -1;
}
return 0;
}
static int
alg_info_parse_str (struct alg_info *alg_info, const char *alg_str, const char **err_p)
{
struct parser_context ctx;
int ret;
const char *ptr;
static char err_buf[256];
*err_buf = 0;
parser_init(&ctx, alg_info->alg_info_protoid);
if (err_p)
*err_p = NULL;
/* use default if nul esp string */
if (!*alg_str)
{
switch (alg_info->alg_info_protoid) {
#ifndef NO_PLUTO
case PROTO_ISAKMP:
alg_info_ike_add(alg_info, 0, 0, 0, 0, 0);
return 0;
#endif
case PROTO_IPSEC_ESP:
alg_info_esp_add(alg_info, 0, 0, 0, 0);
return 0;
default:
/* IMPOSSIBLE */
passert(alg_info->alg_info_protoid);
}
}
for (ret = 0, ptr = alg_str; ret < ST_EOF;)
{
ctx.ch = *ptr++;
ret = parser_machine(&ctx);
switch (ret) {
case ST_FLAG_STRICT:
alg_info->alg_info_flags |= ALG_INFO_F_STRICT;
break;
case ST_END:
case ST_EOF:
DBG(DBG_CRYPT,
DBG_log("alg_info_parse_str() ealg_buf=%s aalg_buf=%s"
"eklen=%d aklen=%d",
ctx.ealg_buf, ctx.aalg_buf,
ctx.eklen, ctx.aklen)
)
if (parser_alg_info_add(&ctx, alg_info) < 0)
{
snprintf(err_buf, sizeof(err_buf),
"%s, enc_alg=\"%s\", auth_alg=\"%s\", modp=\"%s\"",
ctx.err,
ctx.ealg_buf,
ctx.aalg_buf,
ctx.modp_buf);
goto err;
}
/* zero out for next run (ST_END) */
parser_init(&ctx, alg_info->alg_info_protoid);
break;
case ST_ERR:
snprintf(err_buf, sizeof(err_buf),
"%s, just after \"%.*s\" (old_state=%s)",
ctx.err,
(int)(ptr-alg_str-1), alg_str ,
parser_state_name_esp(ctx.old_state));
goto err;
default:
if (!ctx.ch)
break;
}
}
return 0;
err:
if (err_p)
*err_p=err_buf;
return -1;
}
struct alg_info_esp *
alg_info_esp_create_from_str (const char *alg_str, const char **err_p)
{
struct alg_info_esp *alg_info_esp;
char esp_buf[256];
static char err_buf[256];
char *pfs_name;
int ret = 0;
/*
* alg_info storage should be sized dynamically
* but this may require 2passes to know
* transform count in advance.
*/
alg_info_esp = alloc_thing (struct alg_info_esp, "alg_info_esp");
if (!alg_info_esp)
goto out;
pfs_name=index (alg_str, ';');
if (pfs_name)
{
memcpy(esp_buf, alg_str, pfs_name-alg_str);
esp_buf[pfs_name-alg_str] = 0;
alg_str = esp_buf;
pfs_name++;
/* if pfs strings AND first char is not '0' */
if (*pfs_name && pfs_name[0] != '0')
{
ret = modp_getbyname_esp(pfs_name, strlen(pfs_name));
if (ret < 0)
{
/* Bomb if pfsgroup not found */
DBG(DBG_CRYPT,
DBG_log("alg_info_esp_create_from_str(): pfsgroup \"%s\" not found"
, pfs_name)
)
if (*err_p)
{
snprintf(err_buf, sizeof(err_buf),
"pfsgroup \"%s\" not found",
pfs_name);
*err_p = err_buf;
}
goto out;
}
alg_info_esp->esp_pfsgroup = ret;
}
}
else
alg_info_esp->esp_pfsgroup = 0;
alg_info_esp->alg_info_protoid = PROTO_IPSEC_ESP;
ret = alg_info_parse_str((struct alg_info *)alg_info_esp, alg_str, err_p) ;
out:
if (ret < 0)
{
pfreeany(alg_info_esp);
alg_info_esp = NULL;
}
return alg_info_esp;
}
#ifndef NO_PLUTO
struct alg_info_ike *
alg_info_ike_create_from_str (const char *alg_str, const char **err_p)
{
struct alg_info_ike *alg_info_ike;
/*
* alg_info storage should be sized dynamically
* but this may require 2passes to know
* transform count in advance.
*/
alg_info_ike = alloc_thing (struct alg_info_ike, "alg_info_ike");
alg_info_ike->alg_info_protoid = PROTO_ISAKMP;
if (alg_info_parse_str((struct alg_info *)alg_info_ike,
alg_str, err_p) < 0)
{
pfreeany(alg_info_ike);
return NULL;
}
return alg_info_ike;
}
#endif
/*
* alg_info struct can be shared by
* several connections instances,
* handle free() with ref_cnts
*/
void
alg_info_addref(struct alg_info *alg_info)
{
if (alg_info != NULL)
{
alg_info->ref_cnt++;
DBG(DBG_CRYPT,
DBG_log("alg_info_addref() alg_info->ref_cnt=%d"
, alg_info->ref_cnt)
)
}
}
void
alg_info_delref(struct alg_info **alg_info_p)
{
struct alg_info *alg_info = *alg_info_p;
if (alg_info != NULL)
{
passert(alg_info->ref_cnt != 0);
alg_info->ref_cnt--;
DBG(DBG_CRYPT,
DBG_log("alg_info_delref() alg_info->ref_cnt=%d"
, alg_info->ref_cnt)
)
if (alg_info->ref_cnt == 0)
{
DBG(DBG_CRYPT,
DBG_log("alg_info_delref() freeing alg_info")
)
alg_info_free(alg_info);
}
*alg_info_p = NULL;
}
}
/* snprint already parsed transform list (alg_info) */
int
alg_info_snprint(char *buf, int buflen, struct alg_info *alg_info)
{
char *ptr = buf;
int np = 0;
struct esp_info *esp_info;
#ifndef NO_PLUTO
struct ike_info *ike_info;
#endif
int cnt;
switch (alg_info->alg_info_protoid) {
case PROTO_IPSEC_ESP:
{
struct alg_info_esp *alg_info_esp = (struct alg_info_esp *)alg_info;
ALG_INFO_ESP_FOREACH(alg_info_esp, esp_info, cnt)
{
np = snprintf(ptr, buflen, "%d_%03d-%d, "
, esp_info->esp_ealg_id
, (int)esp_info->esp_ealg_keylen
, esp_info->esp_aalg_id);
ptr += np;
buflen -= np;
if (buflen < 0)
goto out;
}
if (alg_info_esp->esp_pfsgroup)
{
np = snprintf(ptr, buflen, "; pfsgroup=%d; "
, alg_info_esp->esp_pfsgroup);
ptr += np;
buflen -= np;
if (buflen < 0)
goto out;
}
break;
}
#ifndef NO_PLUTO
case PROTO_ISAKMP:
ALG_INFO_IKE_FOREACH((struct alg_info_ike *)alg_info, ike_info, cnt)
{
np = snprintf(ptr, buflen, "%d_%03d-%d-%d, "
, ike_info->ike_ealg
, (int)ike_info->ike_eklen
, ike_info->ike_halg
, ike_info->ike_modp);
ptr += np;
buflen -= np;
if (buflen < 0)
goto out;
}
break;
#endif
default:
np = snprintf(buf, buflen, "INVALID protoid=%d\n"
, alg_info->alg_info_protoid);
ptr += np;
buflen -= np;
goto out;
}
np = snprintf(ptr, buflen, "%s"
, alg_info->alg_info_flags & ALG_INFO_F_STRICT?
"strict":"");
ptr += np;
buflen -= np;
out:
if (buflen < 0)
{
loglog(RC_LOG_SERIOUS
, "buffer space exhausted in alg_info_snprint_ike(), buflen=%d"
, buflen);
}
return ptr - buf;
}
#ifndef NO_PLUTO
int
alg_info_snprint_esp(char *buf, int buflen, struct alg_info_esp *alg_info)
{
char *ptr = buf;
int cnt = alg_info->alg_info_cnt;
struct esp_info *esp_info = alg_info->esp;
while (cnt--)
{
if (kernel_alg_esp_enc_ok(esp_info->esp_ealg_id, 0, NULL)
&& kernel_alg_esp_auth_ok(esp_info->esp_aalg_id, NULL))
{
u_int eklen = (esp_info->esp_ealg_keylen)
? esp_info->esp_ealg_keylen
: kernel_alg_esp_enc_keylen(esp_info->esp_ealg_id)
* BITS_PER_BYTE;
u_int aklen = esp_info->esp_aalg_keylen
? esp_info->esp_aalg_keylen
: kernel_alg_esp_auth_keylen(esp_info->esp_aalg_id)
* BITS_PER_BYTE;
int ret = snprintf(ptr, buflen, "%d_%03d-%d_%03d, ",
esp_info->esp_ealg_id, eklen,
esp_info->esp_aalg_id, aklen);
ptr += ret;
buflen -= ret;
if (buflen < 0)
break;
}
esp_info++;
}
return ptr - buf;
}
int
alg_info_snprint_ike(char *buf, int buflen, struct alg_info_ike *alg_info)
{
char *ptr = buf;
int cnt = alg_info->alg_info_cnt;
struct ike_info *ike_info = alg_info->ike;
while (cnt--)
{
struct encrypt_desc *enc_desc = ike_alg_get_encrypter(ike_info->ike_ealg);
struct hash_desc *hash_desc = ike_alg_get_hasher(ike_info->ike_halg);
if (enc_desc != NULL && hash_desc != NULL
&& lookup_group(ike_info->ike_modp))
{
u_int eklen = (ike_info->ike_eklen)
? ike_info->ike_eklen
: enc_desc->keydeflen;
u_int aklen = (ike_info->ike_hklen)
? ike_info->ike_hklen
: hash_desc->hash_digest_size * BITS_PER_BYTE;
int ret = snprintf(ptr, buflen, "%d_%03d-%d_%03d-%d, ",
ike_info->ike_ealg, eklen,
ike_info->ike_halg, aklen,
ike_info->ike_modp);
ptr += ret;
buflen -= ret;
if (buflen < 0)
break;
}
ike_info++;
}
return ptr - buf;
}
#endif /* NO_PLUTO */
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