Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/imap-login/client-authenticate.c @ 8411:abd0ef855a33 HEAD
Implemented imap-response-codes draft.
author | Timo Sirainen <tss@iki.fi> |
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date | Sat, 15 Nov 2008 20:59:54 +0200 |
parents | cd83c5dc66d8 |
children | 6e9100795d89 |
rev | line source |
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Updated copyright notices to include year 2008.
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1 /* Copyright (c) 2002-2008 Dovecot authors, see the included COPYING file */ |
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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 "str-sanitize.h" |
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12 #include "imap-parser.h" |
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13 #include "auth-client.h" |
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14 #include "client.h" |
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15 #include "client-authenticate.h" |
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16 #include "imap-proxy.h" |
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17 |
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18 #include <stdlib.h> |
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19 |
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20 #define IMAP_SERVICE_NAME "imap" |
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21 #define IMAP_AUTH_FAILED_MSG "[AUTHENTICATIONFAILED] "AUTH_FAILED_MSG |
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22 |
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23 const char *client_authenticate_get_capabilities(bool secured) |
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24 { |
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25 const struct auth_mech_desc *mech; |
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26 unsigned int i, count; |
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27 string_t *str; |
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28 |
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29 str = t_str_new(128); |
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30 mech = auth_client_get_available_mechs(auth_client, &count); |
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31 for (i = 0; i < count; i++) { |
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32 /* a) transport is secured |
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33 b) auth mechanism isn't plaintext |
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34 c) we allow insecure authentication |
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35 */ |
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36 if ((mech[i].flags & MECH_SEC_PRIVATE) == 0 && |
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37 (secured || !disable_plaintext_auth || |
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38 (mech[i].flags & MECH_SEC_PLAINTEXT) == 0)) { |
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39 str_append_c(str, ' '); |
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40 str_append(str, "AUTH="); |
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41 str_append(str, mech[i].name); |
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42 } |
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43 } |
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44 |
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45 return str_c(str); |
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46 } |
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47 |
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48 static void client_auth_input(struct imap_client *client) |
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49 { |
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50 char *line; |
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51 |
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52 if (!client_read(client)) |
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53 return; |
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54 |
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55 if (client->skip_line) { |
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56 if (i_stream_next_line(client->common.input) == NULL) |
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57 return; |
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58 |
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59 client->skip_line = FALSE; |
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60 } |
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61 |
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62 /* @UNSAFE */ |
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63 line = i_stream_next_line(client->common.input); |
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64 if (line == NULL) |
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65 return; |
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66 |
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67 if (strcmp(line, "*") == 0) { |
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68 sasl_server_auth_client_error(&client->common, |
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69 "Authentication aborted"); |
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70 } else { |
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71 auth_client_request_continue(client->common.auth_request, line); |
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72 io_remove(&client->io); |
5433 | 73 |
74 /* clear sensitive data */ | |
75 safe_memset(line, 0, strlen(line)); | |
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76 } |
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77 } |
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78 |
7115 | 79 static void client_auth_failed(struct imap_client *client) |
80 { | |
81 /* get back to normal client input. */ | |
82 if (client->io != NULL) | |
83 io_remove(&client->io); | |
84 client->io = io_add(client->common.fd, IO_READ, | |
85 client_input, client); | |
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86 client->common.auth_command_tag = NULL; |
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87 client_input(client); |
7115 | 88 } |
89 | |
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90 static bool client_handle_args(struct imap_client *client, |
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91 const char *const *args, bool success) |
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92 { |
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93 const char *reason = NULL, *host = NULL, *destuser = NULL, *pass = NULL; |
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94 string_t *reply; |
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95 unsigned int port = 143; |
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96 bool proxy = FALSE, temp = FALSE, nologin = !success, proxy_self; |
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97 |
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98 for (; *args != NULL; args++) { |
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99 if (strcmp(*args, "nologin") == 0) |
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100 nologin = TRUE; |
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101 else if (strcmp(*args, "proxy") == 0) |
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102 proxy = TRUE; |
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103 else if (strcmp(*args, "temp") == 0) |
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104 temp = TRUE; |
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105 else if (strncmp(*args, "reason=", 7) == 0) |
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106 reason = *args + 7; |
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107 else if (strncmp(*args, "host=", 5) == 0) |
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108 host = *args + 5; |
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109 else if (strncmp(*args, "port=", 5) == 0) |
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110 port = atoi(*args + 5); |
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111 else if (strncmp(*args, "destuser=", 9) == 0) |
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112 destuser = *args + 9; |
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113 else if (strncmp(*args, "pass=", 5) == 0) |
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114 pass = *args + 5; |
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115 else if (strncmp(*args, "user=", 5) == 0) { |
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116 /* already handled in login-common */ |
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117 } else if (auth_debug) { |
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118 i_info("Ignoring unknown passdb extra field: %s", |
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119 *args); |
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120 } |
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121 } |
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122 |
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123 if (destuser == NULL) |
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124 destuser = client->common.virtual_user; |
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125 |
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126 proxy_self = proxy && |
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127 login_proxy_is_ourself(&client->common, host, port, destuser); |
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128 if (proxy && !proxy_self) { |
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129 /* we want to proxy the connection to another server. |
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130 don't do this unless authentication succeeded. with |
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131 master user proxying we can get FAIL with proxy still set. |
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132 |
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133 proxy host=.. [port=..] [destuser=..] pass=.. */ |
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134 if (!success) |
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135 return FALSE; |
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136 if (imap_proxy_new(client, host, port, destuser, pass) < 0) |
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137 client_destroy_internal_failure(client); |
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138 return TRUE; |
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139 } |
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140 |
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141 if (!proxy && host != NULL) { |
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142 /* IMAP referral |
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143 |
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144 [nologin] referral host=.. [port=..] [destuser=..] |
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145 [reason=..] |
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146 |
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147 NO [REFERRAL imap://destuser;AUTH=..@host:port/] Can't login. |
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148 OK [...] Logged in, but you should use this server instead. |
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149 .. [REFERRAL ..] (Reason from auth server) |
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150 */ |
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151 reply = t_str_new(128); |
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152 str_append(reply, nologin ? "NO " : "OK "); |
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153 str_printfa(reply, "[REFERRAL imap://%s;AUTH=%s@%s", |
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154 destuser, client->common.auth_mech_name, host); |
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155 if (port != 143) |
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156 str_printfa(reply, ":%u", port); |
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157 str_append(reply, "/] "); |
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158 if (reason != NULL) |
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159 str_append(reply, reason); |
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160 else if (nologin) |
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161 str_append(reply, "Try this server instead."); |
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162 else { |
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163 str_append(reply, "Logged in, but you should use " |
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164 "this server instead."); |
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165 } |
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166 client_send_tagline(client, str_c(reply)); |
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167 if (!nologin) { |
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168 client_destroy_success(client, "Login with referral"); |
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169 return TRUE; |
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170 } |
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171 } else if (nologin || proxy_self) { |
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172 /* Authentication went ok, but for some reason user isn't |
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173 allowed to log in. Shouldn't probably happen. */ |
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174 if (proxy_self) { |
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175 client_syslog(&client->common, |
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176 "Proxying loops to itself"); |
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177 } |
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178 |
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179 reply = t_str_new(128); |
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180 if (reason != NULL) |
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181 str_printfa(reply, "NO %s", reason); |
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182 else if (temp || proxy_self) { |
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183 str_append(reply, "NO [UNAVAILABLE] " |
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184 AUTH_TEMP_FAILED_MSG); |
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185 } else { |
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186 str_append(reply, "NO "IMAP_AUTH_FAILED_MSG); |
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187 } |
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188 client_send_tagline(client, str_c(reply)); |
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189 } else { |
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190 /* normal login/failure */ |
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191 return FALSE; |
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192 } |
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193 |
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194 i_assert(nologin || proxy_self); |
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195 |
7115 | 196 if (!client->destroyed) |
197 client_auth_failed(client); | |
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198 return TRUE; |
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199 } |
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200 |
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|
201 static void sasl_callback(struct client *_client, enum sasl_server_reply reply, |
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202 const char *data, const char *const *args) |
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203 { |
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204 struct imap_client *client = (struct imap_client *)_client; |
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205 struct const_iovec iov[3]; |
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|
206 const char *msg; |
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|
207 size_t data_len; |
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208 |
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|
209 i_assert(!client->destroyed || |
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210 reply == SASL_SERVER_REPLY_CLIENT_ERROR || |
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211 reply == SASL_SERVER_REPLY_MASTER_FAILED); |
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Crashfixes and more asserts. Mostly related to use of AUTHENTICATE/AUTH
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212 |
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|
213 switch (reply) { |
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|
214 case SASL_SERVER_REPLY_SUCCESS: |
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215 if (client->to_auth_waiting != NULL) |
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|
216 timeout_remove(&client->to_auth_waiting); |
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217 if (args != NULL) { |
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218 if (client_handle_args(client, args, TRUE)) |
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219 break; |
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220 } |
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221 client_destroy_success(client, "Login"); |
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222 break; |
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|
223 case SASL_SERVER_REPLY_AUTH_FAILED: |
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224 case SASL_SERVER_REPLY_CLIENT_ERROR: |
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225 if (client->to_auth_waiting != NULL) |
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226 timeout_remove(&client->to_auth_waiting); |
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227 if (args != NULL) { |
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228 if (client_handle_args(client, args, FALSE)) |
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229 break; |
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230 } |
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231 |
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|
232 msg = reply == SASL_SERVER_REPLY_AUTH_FAILED ? "NO " : "BAD "; |
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|
233 msg = t_strconcat(msg, data != NULL ? data : |
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|
234 IMAP_AUTH_FAILED_MSG, NULL); |
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|
235 client_send_tagline(client, msg); |
2733
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|
236 |
7099
3f5b7bebfd82
Use separate per-client timeouts instead of going through all clients in one
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237 if (!client->destroyed) |
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238 client_auth_failed(client); |
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239 break; |
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240 case SASL_SERVER_REPLY_MASTER_FAILED: |
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241 if (data == NULL) |
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242 client_destroy_internal_failure(client); |
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243 else { |
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244 client_send_tagline(client, |
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245 t_strconcat("NO ", data, NULL)); |
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246 /* authentication itself succeeded, we just hit some |
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247 internal failure. */ |
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248 client_destroy_success(client, data); |
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249 } |
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250 break; |
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251 case SASL_SERVER_REPLY_CONTINUE: |
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252 data_len = strlen(data); |
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253 iov[0].iov_base = "+ "; |
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254 iov[0].iov_len = 2; |
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255 iov[1].iov_base = data; |
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256 iov[1].iov_len = data_len; |
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257 iov[2].iov_base = "\r\n"; |
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258 iov[2].iov_len = 2; |
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259 |
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260 /* don't check return value here. it gets tricky if we try |
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261 to call client_destroy() in here. */ |
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262 (void)o_stream_sendv(client->output, iov, 3); |
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263 |
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264 i_assert(client->io == NULL); |
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265 client->io = io_add(client->common.fd, IO_READ, |
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266 client_auth_input, client); |
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267 client_auth_input(client); |
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268 return; |
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269 } |
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270 |
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271 client_unref(client); |
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272 } |
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273 |
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274 static int client_auth_begin(struct imap_client *client, const char *mech_name, |
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275 const char *init_resp) |
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276 { |
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277 client->common.auth_command_tag = client->cmd_tag; |
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278 |
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279 client_ref(client); |
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280 sasl_server_auth_begin(&client->common, IMAP_SERVICE_NAME, mech_name, |
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281 init_resp, sasl_callback); |
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282 if (!client->common.authenticating) |
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283 return 1; |
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284 |
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285 /* don't handle input until we get the initial auth reply */ |
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286 if (client->io != NULL) |
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287 io_remove(&client->io); |
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288 client_set_auth_waiting(client); |
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289 return 0; |
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290 } |
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291 |
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292 int cmd_authenticate(struct imap_client *client, const struct imap_arg *args) |
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293 { |
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294 const char *mech_name, *init_resp = NULL; |
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295 |
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296 /* we want only one argument: authentication mechanism name */ |
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297 if (args[0].type != IMAP_ARG_ATOM && args[0].type != IMAP_ARG_STRING) |
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298 return -1; |
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299 if (args[1].type != IMAP_ARG_EOL) { |
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300 /* optional SASL initial response */ |
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301 if (args[1].type != IMAP_ARG_ATOM || |
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302 args[2].type != IMAP_ARG_EOL) |
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303 return -1; |
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304 init_resp = IMAP_ARG_STR(&args[1]); |
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305 } |
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306 |
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307 mech_name = IMAP_ARG_STR(&args[0]); |
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308 if (*mech_name == '\0') |
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309 return -1; |
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310 return client_auth_begin(client, mech_name, init_resp); |
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311 } |
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312 |
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313 int cmd_login(struct imap_client *client, const struct imap_arg *args) |
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314 { |
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315 const char *user, *pass; |
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316 string_t *plain_login, *base64; |
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317 |
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318 /* two arguments: username and password */ |
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319 if (args[0].type != IMAP_ARG_ATOM && args[0].type != IMAP_ARG_STRING) |
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320 return -1; |
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321 if (args[1].type != IMAP_ARG_ATOM && args[1].type != IMAP_ARG_STRING) |
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322 return -1; |
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323 if (args[2].type != IMAP_ARG_EOL) |
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324 return -1; |
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325 |
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326 user = IMAP_ARG_STR(&args[0]); |
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327 pass = IMAP_ARG_STR(&args[1]); |
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328 |
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329 if (!client->common.secured && disable_plaintext_auth) { |
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330 if (verbose_auth) { |
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331 client_syslog(&client->common, "Login failed: " |
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332 "Plaintext authentication disabled"); |
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333 } |
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Instead of logging only "Aborted login", log also if client tried to use
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334 client->common.auth_tried_disabled_plaintext = TRUE; |
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Login process: Log auth failure reasons better in disconnect message.
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335 client->common.auth_attempts++; |
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336 client_send_line(client, |
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337 "* BAD [ALERT] Plaintext authentication is disabled, " |
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338 "but your client sent password in plaintext anyway. " |
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339 "If anyone was listening, the password was exposed."); |
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340 client_send_tagline(client, "NO [CLIENTBUG] " |
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341 AUTH_PLAINTEXT_DISABLED_MSG); |
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342 return 1; |
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343 } |
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344 |
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345 /* authorization ID \0 authentication ID \0 pass */ |
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346 plain_login = buffer_create_dynamic(pool_datastack_create(), 64); |
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347 buffer_append_c(plain_login, '\0'); |
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348 buffer_append(plain_login, user, strlen(user)); |
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changeset
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349 buffer_append_c(plain_login, '\0'); |
9b9d9c164a31
Login process cleanups. Share more authentication code between pop3/imap.
Timo Sirainen <tss@iki.fi>
parents:
2708
diff
changeset
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350 buffer_append(plain_login, pass, strlen(pass)); |
2097
4e77cb0aff21
Added %l, %r and %P variables and mail_log_prefix setting.
Timo Sirainen <tss@iki.fi>
parents:
2088
diff
changeset
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351 |
2736
0f31778d3c34
Changed dovecot-auth protocol to ASCII based. Should be easier now to write
Timo Sirainen <tss@iki.fi>
parents:
2734
diff
changeset
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352 base64 = buffer_create_dynamic(pool_datastack_create(), |
0f31778d3c34
Changed dovecot-auth protocol to ASCII based. Should be easier now to write
Timo Sirainen <tss@iki.fi>
parents:
2734
diff
changeset
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353 MAX_BASE64_ENCODED_SIZE(plain_login->used)); |
0f31778d3c34
Changed dovecot-auth protocol to ASCII based. Should be easier now to write
Timo Sirainen <tss@iki.fi>
parents:
2734
diff
changeset
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354 base64_encode(plain_login->data, plain_login->used, base64); |
7099
3f5b7bebfd82
Use separate per-client timeouts instead of going through all clients in one
Timo Sirainen <tss@iki.fi>
parents:
7086
diff
changeset
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355 return client_auth_begin(client, "PLAIN", str_c(base64)); |
1049
c41787e8c3f4
Moved common login process code to login-common, created pop3-login.
Timo Sirainen <tss@iki.fi>
parents:
diff
changeset
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356 } |