annotate cli-algo.c @ 603:3aa74a4d83ae

Refer to RFCs rather than drafts, update some section references
author Matt Johnston <matt@ucc.asn.au>
date Sun, 27 Feb 2011 13:57:32 +0000
parents 0cfba3034be5
children 870c63519757
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1 /*
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2 * Dropbear - a SSH2 server
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3 * SSH client implementation
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4 *
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5 * Copyright (c) 2002,2003 Matt Johnston
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6 * Copyright (c) 2004 by Mihnea Stoenescu
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7 * All rights reserved.
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8 *
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9 * Permission is hereby granted, free of charge, to any person obtaining a copy
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10 * of this software and associated documentation files (the "Software"), to deal
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11 * in the Software without restriction, including without limitation the rights
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12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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13 * copies of the Software, and to permit persons to whom the Software is
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14 * furnished to do so, subject to the following conditions:
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15 *
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16 * The above copyright notice and this permission notice shall be included in
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17 * all copies or substantial portions of the Software.
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18 *
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19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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25 * SOFTWARE. */
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26
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27 #include "algo.h"
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28 #include "dbutil.h"
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31 /*
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32 * The chosen [encryption | MAC | compression] algorithm to each
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33 * direction MUST be the first algorithm on the client's list
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34 * that is also on the server's list.
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35 */
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36 algo_type * cli_buf_match_algo(buffer* buf, algo_type localalgos[],
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37 int *goodguess) {
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39 unsigned char * algolist = NULL;
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40 unsigned char * remotealgos[MAX_PROPOSED_ALGO];
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41 unsigned int len;
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42 unsigned int count, i, j;
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43 algo_type * ret = NULL;
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44
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45 *goodguess = 0;
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46
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47 /* get the comma-separated list from the buffer ie "algo1,algo2,algo3" */
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48 algolist = buf_getstring(buf, &len);
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49 TRACE(("cli_buf_match_algo: %s", algolist))
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50 if (len > MAX_PROPOSED_ALGO*(MAX_NAME_LEN+1)) {
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51 goto out; /* just a sanity check, no other use */
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52 }
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54 /* remotealgos will contain a list of the strings parsed out */
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55 /* We will have at least one string (even if it's just "") */
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56 remotealgos[0] = algolist;
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57 count = 1;
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58 /* Iterate through, replacing ','s with NULs, to split it into
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59 * words. */
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60 for (i = 0; i < len; i++) {
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61 if (algolist[i] == '\0') {
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62 /* someone is trying something strange */
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63 goto out;
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64 }
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65 if (algolist[i] == ',') {
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66 algolist[i] = '\0';
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67 remotealgos[count] = &algolist[i+1];
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68 count++;
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69 }
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70 if (count == MAX_PROPOSED_ALGO) {
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71 break;
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72 }
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73 }
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74
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75 /* iterate and find the first match */
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76
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77 for (j = 0; localalgos[j].name != NULL; j++) {
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78 if (localalgos[j].usable) {
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79 len = strlen(localalgos[j].name);
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80 for (i = 0; i < count; i++) {
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81 if (len == strlen(remotealgos[i])
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82 && strncmp(localalgos[j].name,
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83 remotealgos[i], len) == 0) {
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84 if (i == 0 && j == 0) {
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85 /* was a good guess */
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86 *goodguess = 1;
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87 }
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88 ret = &localalgos[j];
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89 goto out;
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90 }
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91 }
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92 }
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93 }
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94
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95 out:
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96 m_free(algolist);
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97 return ret;
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98 }
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99