Mercurial > dropbear
annotate cli-authpubkey.c @ 68:eee77ac31ccc
cleaning up the pubkey defines
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 12 Aug 2004 14:56:22 +0000 |
parents | 20563735e8b5 |
children | e3adf4cf5465 |
rev | line source |
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1 #include "includes.h" |
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2 #include "buffer.h" |
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3 #include "dbutil.h" |
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4 #include "session.h" |
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5 #include "ssh.h" |
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6 #include "runopts.h" |
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7 #include "auth.h" |
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8 |
68
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9 #ifdef ENABLE_CLI_PUBKEY_AUTH |
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10 static void send_msg_userauth_pubkey(sign_key *key, int type, int realsign); |
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11 |
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12 /* Called when we receive a SSH_MSG_USERAUTH_FAILURE for a pubkey request. |
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13 * We use it to remove the key we tried from the list */ |
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14 void cli_pubkeyfail() { |
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15 |
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16 struct PubkeyList *keyitem; |
62 | 17 struct PubkeyList **previtem; |
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18 |
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19 TRACE(("enter cli_pubkeyfail")); |
62 | 20 previtem = &cli_opts.pubkeys; |
21 | |
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22 /* Find the key we failed with, and remove it */ |
47 | 23 for (keyitem = cli_opts.pubkeys; keyitem != NULL; keyitem = keyitem->next) { |
62 | 24 if (keyitem == cli_ses.lastpubkey) { |
25 *previtem = keyitem->next; | |
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26 } |
62 | 27 previtem = &keyitem; |
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28 } |
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29 |
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30 sign_key_free(cli_ses.lastpubkey->key); /* It won't be used again */ |
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31 m_free(cli_ses.lastpubkey); |
62 | 32 |
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33 TRACE(("leave cli_pubkeyfail")); |
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34 } |
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35 |
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36 void recv_msg_userauth_pk_ok() { |
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37 |
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38 struct PubkeyList *keyitem; |
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39 buffer* keybuf; |
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40 char* algotype = NULL; |
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41 unsigned int algolen; |
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42 int keytype; |
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43 unsigned int remotelen; |
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44 |
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45 TRACE(("enter recv_msg_userauth_pk_ok")); |
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46 |
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47 algotype = buf_getstring(ses.payload, &algolen); |
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48 keytype = signkey_type_from_name(algotype, algolen); |
47 | 49 TRACE(("recv_msg_userauth_pk_ok: type %d", keytype)); |
45
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50 m_free(algotype); |
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51 |
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52 keybuf = buf_new(MAX_PUBKEY_SIZE); |
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53 |
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54 remotelen = buf_getint(ses.payload); |
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55 |
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56 /* Iterate through our keys, find which one it was that matched, and |
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57 * send a real request with that key */ |
47 | 58 for (keyitem = cli_opts.pubkeys; keyitem != NULL; keyitem = keyitem->next) { |
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59 |
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60 if (keyitem->type != keytype) { |
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61 /* Types differed */ |
47 | 62 TRACE(("types differed")); |
45
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63 continue; |
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64 } |
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65 |
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66 /* Now we compare the contents of the key */ |
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67 keybuf->pos = keybuf->len = 0; |
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68 buf_put_pub_key(keybuf, keyitem->key, keytype); |
47 | 69 buf_setpos(keybuf, 0); |
70 buf_incrpos(keybuf, 4); /* first int is the length of the remainder (ie | |
71 remotelen) which has already been taken from | |
72 the remote buffer */ | |
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73 |
47 | 74 |
75 if (keybuf->len-4 != remotelen) { | |
76 TRACE(("lengths differed: localh %d remote %d", keybuf->len, remotelen)); | |
45
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77 /* Lengths differed */ |
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78 continue; |
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79 } |
47 | 80 if (memcmp(buf_getptr(keybuf, remotelen), |
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81 buf_getptr(ses.payload, remotelen), remotelen) != 0) { |
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82 /* Data didn't match this key */ |
47 | 83 TRACE(("data differed")); |
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84 continue; |
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85 } |
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86 |
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87 /* Success */ |
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88 break; |
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89 } |
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90 |
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91 if (keyitem != NULL) { |
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92 TRACE(("matching key")); |
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93 /* XXX TODO: if it's an encrypted key, here we ask for their |
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94 * password */ |
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95 send_msg_userauth_pubkey(keyitem->key, keytype, 1); |
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96 } else { |
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97 TRACE(("That was whacky. We got told that a key was valid, but it didn't match our list. Sounds like dodgy code on Dropbear's part")); |
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98 } |
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99 |
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100 TRACE(("leave recv_msg_userauth_pk_ok")); |
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101 } |
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102 |
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103 /* TODO: make it take an agent reference to use as well */ |
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104 static void send_msg_userauth_pubkey(sign_key *key, int type, int realsign) { |
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105 |
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106 const char *algoname = NULL; |
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107 int algolen; |
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108 buffer* sigbuf = NULL; |
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109 |
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110 TRACE(("enter send_msg_userauth_pubkey")); |
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111 CHECKCLEARTOWRITE(); |
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112 |
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113 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST); |
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114 |
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115 buf_putstring(ses.writepayload, cli_opts.username, |
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116 strlen(cli_opts.username)); |
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117 |
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118 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION, |
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119 SSH_SERVICE_CONNECTION_LEN); |
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120 |
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121 buf_putstring(ses.writepayload, AUTH_METHOD_PUBKEY, |
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122 AUTH_METHOD_PUBKEY_LEN); |
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123 |
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124 buf_putbyte(ses.writepayload, realsign); |
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125 |
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126 algoname = signkey_name_from_type(type, &algolen); |
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127 |
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128 buf_putstring(ses.writepayload, algoname, algolen); |
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129 buf_put_pub_key(ses.writepayload, key, type); |
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130 |
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131 if (realsign) { |
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132 TRACE(("realsign")); |
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133 /* We put the signature as well - this contains string(session id), then |
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134 * the contents of the write payload to this point */ |
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135 sigbuf = buf_new(4 + SHA1_HASH_SIZE + ses.writepayload->len); |
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136 buf_putstring(sigbuf, ses.session_id, SHA1_HASH_SIZE); |
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137 buf_putbytes(sigbuf, ses.writepayload->data, ses.writepayload->len); |
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138 buf_put_sign(ses.writepayload, key, type, sigbuf->data, sigbuf->len); |
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139 buf_free(sigbuf); /* Nothing confidential in the buffer */ |
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140 } |
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141 |
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142 encrypt_packet(); |
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143 TRACE(("leave send_msg_userauth_pubkey")); |
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144 } |
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145 |
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146 int cli_auth_pubkey() { |
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147 |
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148 TRACE(("enter cli_auth_pubkey")); |
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149 |
47 | 150 if (cli_opts.pubkeys != NULL) { |
45
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151 /* Send a trial request */ |
47 | 152 send_msg_userauth_pubkey(cli_opts.pubkeys->key, |
153 cli_opts.pubkeys->type, 0); | |
62 | 154 cli_ses.lastpubkey = cli_opts.pubkeys; |
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155 TRACE(("leave cli_auth_pubkey-success")); |
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156 return 1; |
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157 } else { |
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158 TRACE(("leave cli_auth_pubkey-failure")); |
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159 return 0; |
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160 } |
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161 } |
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162 #endif /* Pubkey auth */ |