Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/imap-login/client-authenticate.c @ 1894:07324c0d1d0a HEAD

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IMAP AUTHENTICATE and POP3 AUTH commands could have left the process stuck doing nothing forever.
author Timo Sirainen <tss@iki.fi>
date Tue, 25 Nov 2003 03:26:26 +0200
parents 2f3d906d99d8
children d2755efdd187
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* Copyright (C) 2002 Timo Sirainen */
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2
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3 #include "common.h"
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4 #include "base64.h"
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5 #include "buffer.h"
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6 #include "ioloop.h"
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7 #include "istream.h"
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8 #include "ostream.h"
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9 #include "safe-memset.h"
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10 #include "str.h"
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11 #include "imap-parser.h"
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12 #include "auth-client.h"
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13 #include "../auth/auth-mech-desc.h"
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14 #include "client.h"
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15 #include "client-authenticate.h"
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16 #include "auth-common.h"
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17 #include "master.h"
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18
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19 const char *client_authenticate_get_capabilities(int secured)
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20 {
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21 static enum auth_mech cached_auth_mechs = 0;
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22 static char *cached_capability = NULL;
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23 enum auth_mech auth_mechs;
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24 string_t *str;
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25 int i;
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26
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27 auth_mechs = auth_client_get_available_mechs(auth_client);
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28 if (auth_mechs == cached_auth_mechs)
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29 return cached_capability;
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30
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31 cached_auth_mechs = auth_mechs;
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32 i_free(cached_capability);
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33
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34 str = t_str_new(128);
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35
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36 for (i = 0; i < AUTH_MECH_COUNT; i++) {
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37 if ((auth_mechs & auth_mech_desc[i].mech) &&
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38 auth_mech_desc[i].name != NULL &&
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39 (secured || !auth_mech_desc[i].plaintext ||
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40 !disable_plaintext_auth)) {
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41 str_append_c(str, ' ');
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42 str_append(str, "AUTH=");
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43 str_append(str, auth_mech_desc[i].name);
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44 }
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45 }
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46
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47 cached_capability = i_strdup_empty(str_c(str));
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48 return cached_capability;
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49 }
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50
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51 static struct auth_mech_desc *auth_mech_find(const char *name)
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52 {
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53 int i;
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54
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55 for (i = 0; i < AUTH_MECH_COUNT; i++) {
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56 if (auth_mech_desc[i].name != NULL &&
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57 strcasecmp(auth_mech_desc[i].name, name) == 0)
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58 return &auth_mech_desc[i];
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59 }
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60
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61 return NULL;
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62 }
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63
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64 static void client_auth_abort(struct imap_client *client, const char *msg)
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65 {
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66 client->authenticating = FALSE;
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67
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68 if (client->common.auth_request != NULL) {
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69 auth_client_request_abort(client->common.auth_request);
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70 client->common.auth_request = NULL;
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71 }
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72
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73 client_send_tagline(client, msg != NULL ?
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74 t_strconcat("NO ", msg, NULL) :
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75 "NO Authentication failed.");
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76 o_stream_flush(client->output);
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77
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78 /* get back to normal client input */
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79 if (client->common.io != NULL)
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80 io_remove(client->common.io);
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81 client->common.io = client->common.fd == -1 ? NULL :
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82 io_add(client->common.fd, IO_READ, client_input, client);
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83
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84 client_unref(client);
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85 }
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86
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87 static void master_callback(struct client *_client, int success)
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88 {
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89 struct imap_client *client = (struct imap_client *) _client;
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90 const char *reason = NULL;
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91
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92 if (success) {
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93 reason = t_strconcat("Login: ", client->common.virtual_user,
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94 NULL);
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95 } else {
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96 reason = t_strconcat("Internal login failure: ",
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97 client->common.virtual_user, NULL);
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98 client_send_line(client, "* BYE Internal login failure.");
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99 }
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100
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101 client_destroy(client, reason);
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102 }
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103
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104 static void client_send_auth_data(struct imap_client *client,
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105 const unsigned char *data, size_t size)
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106 {
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107 buffer_t *buf;
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108
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109 t_push();
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110
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111 buf = buffer_create_dynamic(pool_datastack_create(),
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112 size*2, (size_t)-1);
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113 buffer_append(buf, "+ ", 2);
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114 base64_encode(data, size, buf);
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115 buffer_append(buf, "\r\n", 2);
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116
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117 o_stream_send(client->output, buffer_get_data(buf, NULL),
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118 buffer_get_used_size(buf));
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119 o_stream_flush(client->output);
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120
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121 t_pop();
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122 }
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123
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124 static void login_callback(struct auth_request *request,
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125 struct auth_client_request_reply *reply,
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126 const unsigned char *data, void *context)
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127 {
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128 struct imap_client *client = context;
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129 const char *error;
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130 const void *ptr;
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131 size_t size;
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132
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133 switch (auth_callback(request, reply, data, &client->common,
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134 master_callback, &error)) {
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135 case -1:
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136 /* login failed */
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137 client_auth_abort(client, error);
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138 break;
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139
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140 case 0:
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141 /* continue */
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142 ptr = buffer_get_data(client->plain_login, &size);
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143 auth_client_request_continue(request, ptr, size);
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144
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145 buffer_set_used_size(client->plain_login, 0);
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146 break;
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147 default:
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148 /* success, we should be able to log in. if we fail, just
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149 disconnect the client. */
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150 client->authenticating = FALSE;
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151 client_send_tagline(client, "OK Logged in.");
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152 client_unref(client);
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153 }
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154 }
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155
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156 int cmd_login(struct imap_client *client, struct imap_arg *args)
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157 {
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158 const char *user, *pass, *error;
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159
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160 /* two arguments: username and password */
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161 if (args[0].type != IMAP_ARG_ATOM && args[0].type != IMAP_ARG_STRING)
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162 return FALSE;
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163 if (args[1].type != IMAP_ARG_ATOM && args[1].type != IMAP_ARG_STRING)
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164 return FALSE;
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165 if (args[2].type != IMAP_ARG_EOL)
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166 return FALSE;
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167
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168 user = IMAP_ARG_STR(&args[0]);
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169 pass = IMAP_ARG_STR(&args[1]);
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170
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171 if (!client->secured && disable_plaintext_auth) {
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172 client_send_line(client,
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173 "* BAD [ALERT] Plaintext authentication is disabled, "
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174 "but your client sent password in plaintext anyway. "
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175 "If anyone was listening, the password was exposed.");
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176 client_send_tagline(client,
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177 "NO Plaintext authentication disabled.");
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178 return TRUE;
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179 }
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180
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181 /* authorization ID \0 authentication ID \0 pass */
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182 buffer_set_used_size(client->plain_login, 0);
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183 buffer_append_c(client->plain_login, '\0');
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184 buffer_append(client->plain_login, user, strlen(user));
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185 buffer_append_c(client->plain_login, '\0');
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186 buffer_append(client->plain_login, pass, strlen(pass));
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187
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188 client_ref(client);
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189 client->common.auth_request =
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190 auth_client_request_new(auth_client, AUTH_MECH_PLAIN,
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191 AUTH_PROTOCOL_IMAP, login_callback,
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192 client, &error);
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193 if (client->common.auth_request == NULL) {
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194 client_send_tagline(client, t_strconcat(
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195 "NO Login failed: ", error, NULL));
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196 client_unref(client);
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197 return TRUE;
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198 }
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199
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200 /* don't read any input from client until login is finished */
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diff changeset
201 if (client->common.io != NULL) {
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diff changeset
202 io_remove(client->common.io);
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diff changeset
203 client->common.io = NULL;
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diff changeset
204 }
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diff changeset
205
43815588dd6b Moved client side code for auth process handling to lib-auth. Some other login process cleanups.
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diff changeset
206 client->authenticating = TRUE;
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diff changeset
207 return TRUE;
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diff changeset
208 }
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diff changeset
209
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diff changeset
210 static void authenticate_callback(struct auth_request *request,
1702
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diff changeset
211 struct auth_client_request_reply *reply,
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diff changeset
212 const unsigned char *data, void *context)
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diff changeset
213 {
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diff changeset
214 struct imap_client *client = context;
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diff changeset
215 const char *error;
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diff changeset
216
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diff changeset
217 switch (auth_callback(request, reply, data, &client->common,
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diff changeset
218 master_callback, &error)) {
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diff changeset
219 case -1:
86b8c9cb7ac0 Moved more auth code to login-common.
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diff changeset
220 /* login failed */
86b8c9cb7ac0 Moved more auth code to login-common.
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diff changeset
221 client_auth_abort(client, error);
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diff changeset
222 break;
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diff changeset
223
86b8c9cb7ac0 Moved more auth code to login-common.
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diff changeset
224 case 0:
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diff changeset
225 /* continue */
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diff changeset
226 client_send_auth_data(client, data, reply->data_size);
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diff changeset
227 break;
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diff changeset
228 default:
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diff changeset
229 /* success, we should be able to log in. if we fail, just
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diff changeset
230 disconnect the client. */
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af685269ead0 login: Wait until we're connected to auth process before executing command
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diff changeset
231 client->authenticating = FALSE;
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diff changeset
232 client_send_tagline(client, "OK Logged in.");
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diff changeset
233 client_unref(client);
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diff changeset
234 }
1049
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diff changeset
235 }
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diff changeset
236
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diff changeset
237 static void client_auth_input(void *context)
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diff changeset
238 {
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diff changeset
239 struct imap_client *client = context;
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parents:
diff changeset
240 buffer_t *buf;
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parents:
diff changeset
241 char *line;
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parents:
diff changeset
242 size_t linelen, bufsize;
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parents:
diff changeset
243
1894
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parents: 1782
diff changeset
244 if (!client_read(client)) {
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diff changeset
245 client_unref(client);
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diff changeset
246 return;
1894
07324c0d1d0a IMAP AUTHENTICATE and POP3 AUTH commands could have left the process stuck
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diff changeset
247 }
1049
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parents:
diff changeset
248
c41787e8c3f4 Moved common login process code to login-common, created pop3-login.
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parents:
diff changeset
249 if (client->skip_line) {
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parents:
diff changeset
250 if (i_stream_next_line(client->input) == NULL)
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parents:
diff changeset
251 return;
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parents:
diff changeset
252
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parents:
diff changeset
253 client->skip_line = FALSE;
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parents:
diff changeset
254 }
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parents:
diff changeset
255
c41787e8c3f4 Moved common login process code to login-common, created pop3-login.
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parents:
diff changeset
256 /* @UNSAFE */
c41787e8c3f4 Moved common login process code to login-common, created pop3-login.
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parents:
diff changeset
257 line = i_stream_next_line(client->input);
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parents:
diff changeset
258 if (line == NULL)
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parents:
diff changeset
259 return;
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260
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261 if (strcmp(line, "*") == 0) {
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262 client_auth_abort(client, "Authentication aborted");
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263 return;
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264 }
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265
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266 linelen = strlen(line);
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267 buf = buffer_create_static_hard(pool_datastack_create(), linelen);
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268
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269 if (base64_decode((const unsigned char *) line, linelen,
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270 NULL, buf) <= 0) {
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271 /* failed */
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272 client_auth_abort(client, "Invalid base64 data");
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273 } else if (client->common.auth_request == NULL) {
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274 client_auth_abort(client, "Don't send unrequested data");
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275 } else {
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276 auth_client_request_continue(client->common.auth_request,
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277 buffer_get_data(buf, NULL),
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278 buffer_get_used_size(buf));
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279 }
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280
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281 /* clear sensitive data */
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282 safe_memset(line, 0, linelen);
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283
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284 bufsize = buffer_get_used_size(buf);
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285 safe_memset(buffer_free_without_data(buf), 0, bufsize);
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286 }
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287
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288 int cmd_authenticate(struct imap_client *client, struct imap_arg *args)
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289 {
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290 struct auth_mech_desc *mech;
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291 const char *mech_name, *error;
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292
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293 /* we want only one argument: authentication mechanism name */
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294 if (args[0].type != IMAP_ARG_ATOM && args[0].type != IMAP_ARG_STRING)
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295 return FALSE;
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296 if (args[1].type != IMAP_ARG_EOL)
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297 return FALSE;
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298
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299 mech_name = IMAP_ARG_STR(&args[0]);
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300 if (*mech_name == '\0')
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301 return FALSE;
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302
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303 mech = auth_mech_find(mech_name);
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304 if (mech == NULL) {
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305 client_send_tagline(client,
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306 "NO Unsupported authentication mechanism.");
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307 return TRUE;
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308 }
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309
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310 if (!client->secured && mech->plaintext && disable_plaintext_auth) {
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diff changeset
311 client_send_tagline(client,
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312 "NO Plaintext authentication disabled.");
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313 return TRUE;
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314 }
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315
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316 client_ref(client);
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diff changeset
317 client->common.auth_request =
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318 auth_client_request_new(auth_client, mech->mech,
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diff changeset
319 AUTH_PROTOCOL_IMAP,
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diff changeset
320 authenticate_callback,
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diff changeset
321 client, &error);
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diff changeset
322 if (client->common.auth_request != NULL) {
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323 /* following input data will go to authentication */
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324 if (client->common.io != NULL)
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diff changeset
325 io_remove(client->common.io);
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diff changeset
326 client->common.io = io_add(client->common.fd, IO_READ,
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diff changeset
327 client_auth_input, client);
1275
af685269ead0 login: Wait until we're connected to auth process before executing command
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diff changeset
328 client->authenticating = TRUE;
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329 } else {
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diff changeset
330 client_send_tagline(client, t_strconcat(
c41787e8c3f4 Moved common login process code to login-common, created pop3-login.
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diff changeset
331 "NO Authentication failed: ", error, NULL));
1714
96dab004a87a fixes. maybe it works now.
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diff changeset
332 client_unref(client);
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diff changeset
333 }
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diff changeset
334
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diff changeset
335 return TRUE;
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parents:
diff changeset
336 }