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cm-12.0

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cli-algo.c

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/*

* Dropbear - a SSH2 server

* SSH client implementation

*

* Copyright (c) 2002,2003 Matt Johnston

* Copyright (c) 2004 by Mihnea Stoenescu

* All rights reserved.

*

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

*

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

*

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

* SOFTWARE. */

#include "algo.h"

#include "dbutil.h"

/*

* The chosen [encryption | MAC | compression] algorithm to each

* direction MUST be the first algorithm on the client's list

* that is also on the server's list.

*/

algo_type * cli_buf_match_algo(buffer* buf, algo_type localalgos[],

int *goodguess) {

unsigned char * algolist = NULL;

unsigned char * remotealgos[MAX_PROPOSED_ALGO];

unsigned int len;

unsigned int count, i, j;

algo_type * ret = NULL;

*goodguess = 0;

/* get the comma-separated list from the buffer ie "algo1,algo2,algo3" */

algolist = buf_getstring(buf, &len);

TRACE(("cli_buf_match_algo: %s", algolist))

if (len > MAX_PROPOSED_ALGO*(MAX_NAME_LEN+1)) {

goto out; /* just a sanity check, no other use */

}

/* remotealgos will contain a list of the strings parsed out */

/* We will have at least one string (even if it's just "") */

remotealgos[0] = algolist;

count = 1;

/* Iterate through, replacing ','s with NULs, to split it into

* words. */

for (i = 0; i < len; i++) {

if (algolist[i] == '\0') {

/* someone is trying something strange */

goto out;

}

if (algolist[i] == ',') {

algolist[i] = '\0';

remotealgos[count] = &algolist[i+1];

count++;

}

if (count == MAX_PROPOSED_ALGO) {

break;

}

}

/* iterate and find the first match */

for (j = 0; localalgos[j].name != NULL; j++) {

if (localalgos[j].usable) {

len = strlen(localalgos[j].name);

for (i = 0; i < count; i++) {

if (len == strlen(remotealgos[i])

&& strncmp(localalgos[j].name,

remotealgos[i], len) == 0) {

if (i == 0 && j == 0) {

/* was a good guess */

*goodguess = 1;

}

ret = &localalgos[j];

goto out;

}

}

}

}

out:

m_free(algolist);

return ret;

}