Mercurial > dropbear
annotate cli-authpubkey.c @ 45:9ee8996a375f
Pubkey auth is mostly there for the client. Something strange with
remote hostkey verification though.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 03 Aug 2004 17:26:56 +0000 |
parents | |
children | 4b53a43f0082 |
rev | line source |
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45
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Pubkey auth is mostly there for the client. Something strange with
Matt Johnston <matt@ucc.asn.au>
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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 |
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9 static void send_msg_userauth_pubkey(sign_key *key, int type, int realsign); |
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10 |
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11 /* Called when we receive a SSH_MSG_USERAUTH_FAILURE for a pubkey request. |
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12 * We use it to remove the key we tried from the list */ |
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13 void cli_pubkeyfail() { |
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14 |
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15 struct PubkeyList *keyitem; |
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16 |
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17 TRACE(("enter cli_pubkeyfail")); |
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18 /* Find the key we failed with, and remove it */ |
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19 for (keyitem = cli_ses.pubkeys; keyitem != NULL; keyitem = keyitem->next) { |
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20 if (keyitem->next == cli_ses.lastpubkey) { |
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21 keyitem->next = cli_ses.lastpubkey->next; |
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22 } |
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23 } |
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24 |
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25 sign_key_free(cli_ses.lastpubkey->key); /* It won't be used again */ |
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26 m_free(cli_ses.lastpubkey); |
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27 TRACE(("leave cli_pubkeyfail")); |
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28 } |
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29 |
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30 void recv_msg_userauth_pk_ok() { |
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31 |
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32 struct PubkeyList *keyitem; |
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33 buffer* keybuf; |
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34 char* algotype = NULL; |
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35 unsigned int algolen; |
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36 int keytype; |
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37 unsigned int remotelen; |
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38 |
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39 TRACE(("enter recv_msg_userauth_pk_ok")); |
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40 |
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41 algotype = buf_getstring(ses.payload, &algolen); |
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42 keytype = signkey_type_from_name(algotype, algolen); |
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43 m_free(algotype); |
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44 |
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45 keybuf = buf_new(MAX_PUBKEY_SIZE); |
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46 |
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47 remotelen = buf_getint(ses.payload); |
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48 |
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49 /* Iterate through our keys, find which one it was that matched, and |
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50 * send a real request with that key */ |
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51 for (keyitem = cli_ses.pubkeys; keyitem != NULL; keyitem = keyitem->next) { |
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52 |
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53 if (keyitem->type != keytype) { |
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54 /* Types differed */ |
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55 continue; |
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56 } |
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57 |
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58 /* Now we compare the contents of the key */ |
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59 keybuf->pos = keybuf->len = 0; |
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60 buf_put_pub_key(keybuf, keyitem->key, keytype); |
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61 |
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62 if (keybuf->len != remotelen) { |
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63 /* Lengths differed */ |
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64 continue; |
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65 } |
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66 |
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67 if (memcmp(keybuf->data, |
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68 buf_getptr(ses.payload, remotelen), remotelen) != 0) { |
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69 /* Data didn't match this key */ |
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70 continue; |
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71 } |
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72 |
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73 /* Success */ |
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74 break; |
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75 } |
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76 |
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77 if (keyitem != NULL) { |
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78 TRACE(("matching key")); |
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79 /* XXX TODO: if it's an encrypted key, here we ask for their |
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80 * password */ |
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81 send_msg_userauth_pubkey(keyitem->key, keytype, 1); |
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82 } else { |
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83 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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84 } |
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85 |
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86 TRACE(("leave recv_msg_userauth_pk_ok")); |
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87 } |
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88 |
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89 /* TODO: make it take an agent reference to use as well */ |
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90 static void send_msg_userauth_pubkey(sign_key *key, int type, int realsign) { |
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91 |
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92 const char *algoname = NULL; |
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93 int algolen; |
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94 buffer* sigbuf = NULL; |
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95 |
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96 TRACE(("enter send_msg_userauth_pubkey")); |
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97 CHECKCLEARTOWRITE(); |
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98 |
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99 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST); |
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100 |
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101 buf_putstring(ses.writepayload, cli_opts.username, |
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102 strlen(cli_opts.username)); |
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103 |
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104 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION, |
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105 SSH_SERVICE_CONNECTION_LEN); |
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106 |
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107 buf_putstring(ses.writepayload, AUTH_METHOD_PUBKEY, |
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108 AUTH_METHOD_PUBKEY_LEN); |
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109 |
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110 buf_putbyte(ses.writepayload, realsign); |
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111 |
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112 algoname = signkey_name_from_type(type, &algolen); |
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113 |
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114 buf_putstring(ses.writepayload, algoname, algolen); |
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115 buf_put_pub_key(ses.writepayload, key, type); |
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116 |
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117 if (realsign) { |
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118 TRACE(("realsign")); |
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119 /* We put the signature as well - this contains string(session id), then |
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120 * the contents of the write payload to this point */ |
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121 sigbuf = buf_new(4 + SHA1_HASH_SIZE + ses.writepayload->len); |
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122 buf_putstring(sigbuf, ses.session_id, SHA1_HASH_SIZE); |
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123 buf_putbytes(sigbuf, ses.writepayload->data, ses.writepayload->len); |
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Pubkey auth is mostly there for the client. Something strange with
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124 buf_put_sign(ses.writepayload, key, type, sigbuf->data, sigbuf->len); |
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125 buf_free(sigbuf); /* Nothing confidential in the buffer */ |
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Pubkey auth is mostly there for the client. Something strange with
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126 } |
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Pubkey auth is mostly there for the client. Something strange with
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127 |
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128 encrypt_packet(); |
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129 TRACE(("leave send_msg_userauth_pubkey")); |
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130 } |
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131 |
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132 int cli_auth_pubkey() { |
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133 |
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134 TRACE(("enter cli_auth_pubkey")); |
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135 |
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136 if (cli_ses.pubkeys != NULL) { |
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137 /* Send a trial request */ |
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138 send_msg_userauth_pubkey(cli_ses.pubkeys->key, |
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139 cli_ses.pubkeys->type, 0); |
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140 TRACE(("leave cli_auth_pubkey-success")); |
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141 return 1; |
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142 } else { |
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143 TRACE(("leave cli_auth_pubkey-failure")); |
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144 return 0; |
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145 } |
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146 } |