Mercurial > dropbear

annotate cli-algo.c @ 740:3062da90dab8 kexguess

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Add kexguess2 behaviour
author Matt Johnston <matt@ucc.asn.au>
date Fri, 29 Mar 2013 23:29:48 +0800
parents 870c63519757
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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25
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
Matt Johnston <matt@ucc.asn.au>
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1 /*
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2 * Dropbear - a SSH2 server
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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3 * SSH client implementation
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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4 *
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5 * Copyright (c) 2002,2003 Matt Johnston
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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6 * Copyright (c) 2004 by Mihnea Stoenescu
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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7 * All rights reserved.
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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8 *
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9 * Permission is hereby granted, free of charge, to any person obtaining a copy
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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10 * of this software and associated documentation files (the "Software"), to deal
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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11 * in the Software without restriction, including without limitation the rights
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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13 * copies of the Software, and to permit persons to whom the Software is
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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14 * furnished to do so, subject to the following conditions:
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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15 *
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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16 * The above copyright notice and this permission notice shall be included in
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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17 * all copies or substantial portions of the Software.
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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18 *
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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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
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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25 * SOFTWARE. */
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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26
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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27 #include "algo.h"
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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28 #include "dbutil.h"
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29
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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30
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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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 */
26
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36 algo_type * cli_buf_match_algo(buffer* buf, algo_type localalgos[],
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37 enum kexguess2_used *kexguess2, int *goodguess) {
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e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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38
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39 unsigned char * algolist = NULL;
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40 unsigned char * remotealgos[MAX_PROPOSED_ALGO];
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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41 unsigned int len;
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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42 unsigned int count, i, j;
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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43 algo_type * ret = NULL;
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44
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45 if (goodguess) {
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46 *goodguess = 0;
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47 }
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48
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49 /* get the comma-separated list from the buffer ie "algo1,algo2,algo3" */
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50 algolist = buf_getstring(buf, &len);
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0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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51 TRACE(("cli_buf_match_algo: %s", algolist))
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e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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52 if (len > MAX_PROPOSED_ALGO*(MAX_NAME_LEN+1)) {
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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53 goto out; /* just a sanity check, no other use */
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54 }
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55
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56 /* remotealgos will contain a list of the strings parsed out */
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57 /* We will have at least one string (even if it's just "") */
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58 remotealgos[0] = algolist;
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59 count = 1;
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60 /* Iterate through, replacing ','s with NULs, to split it into
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61 * words. */
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62 for (i = 0; i < len; i++) {
e4b6e2d569b2 Rename cli_algo.c to cli-algo.c for consistency
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63 if (algolist[i] == '\0') {
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64 /* someone is trying something strange */
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65 goto out;
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66 }
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67 if (algolist[i] == ',') {
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68 algolist[i] = '\0';
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69 remotealgos[count] = &algolist[i+1];
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70 count++;
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71 }
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870c63519757 Change comparison to be more paranoid (and perhaps avoid Klocwork false
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72 if (count >= MAX_PROPOSED_ALGO) {
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73 break;
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74 }
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75 }
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76
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77 if (kexguess2 && *kexguess2 == KEXGUESS2_LOOK) {
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78 for (i = 0; i < count; i++)
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79 {
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80 if (strcmp(remotealgos[i], KEXGUESS2_ALGO_NAME) == 0) {
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81 *kexguess2 = KEXGUESS2_YES;
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82 break;
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83 }
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84 }
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85 if (*kexguess2 == KEXGUESS2_LOOK) {
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86 *kexguess2 = KEXGUESS2_NO;
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87 }
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88 }
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89
25
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90 /* iterate and find the first match */
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91
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92 for (j = 0; localalgos[j].name != NULL; j++) {
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93 if (localalgos[j].usable) {
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94 len = strlen(localalgos[j].name);
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95 for (i = 0; i < count; i++) {
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96 if (len == strlen(remotealgos[i])
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97 && strncmp(localalgos[j].name,
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98 remotealgos[i], len) == 0) {
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99 if (goodguess && kexguess2) {
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100 if (*kexguess2 == KEXGUESS2_YES) {
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101 if (j == 0) {
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102 *goodguess = 1;
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103 }
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104 } else {
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105 if (i == 0 && j == 0) {
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106 *goodguess = 1;
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107 }
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108 }
26
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109 }
25
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110 ret = &localalgos[j];
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111 goto out;
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112 }
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113 }
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114 }
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115 }
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116
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117 out:
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118 m_free(algolist);
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119 return ret;
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120 }
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121