Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/imap-login/client-authenticate.c @ 7086:7ed926ed7aa4 HEAD
Updated copyright notices to include year 2008.
author | Timo Sirainen <tss@iki.fi> |
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date | Tue, 01 Jan 2008 22:05:21 +0200 |
parents | 249e6c711e8d |
children | 3f5b7bebfd82 |
rev | line source |
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7086
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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 |
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22 const char *client_authenticate_get_capabilities(bool secured) |
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23 { |
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24 const struct auth_mech_desc *mech; |
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25 unsigned int i, count; |
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26 string_t *str; |
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27 |
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28 str = t_str_new(128); |
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29 mech = auth_client_get_available_mechs(auth_client, &count); |
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30 for (i = 0; i < count; i++) { |
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31 /* a) transport is secured |
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32 b) auth mechanism isn't plaintext |
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33 c) we allow insecure authentication |
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34 */ |
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35 if ((mech[i].flags & MECH_SEC_PRIVATE) == 0 && |
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36 (secured || !disable_plaintext_auth || |
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37 (mech[i].flags & MECH_SEC_PLAINTEXT) == 0)) { |
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38 str_append_c(str, ' '); |
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39 str_append(str, "AUTH="); |
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40 str_append(str, mech[i].name); |
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41 } |
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42 } |
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43 |
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44 return str_c(str); |
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45 } |
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46 |
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47 static void client_auth_input(struct imap_client *client) |
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48 { |
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49 char *line; |
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50 |
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51 if (!client_read(client)) |
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52 return; |
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53 |
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54 if (client->skip_line) { |
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55 if (i_stream_next_line(client->input) == NULL) |
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56 return; |
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57 |
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58 client->skip_line = FALSE; |
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59 } |
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60 |
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61 /* @UNSAFE */ |
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62 line = i_stream_next_line(client->input); |
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63 if (line == NULL) |
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64 return; |
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65 |
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66 if (strcmp(line, "*") == 0) { |
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67 sasl_server_auth_client_error(&client->common, |
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68 "Authentication aborted"); |
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69 } else { |
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70 auth_client_request_continue(client->common.auth_request, line); |
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71 io_remove(&client->io); |
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73 /* clear sensitive data */ | |
74 safe_memset(line, 0, strlen(line)); | |
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75 } |
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76 } |
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77 |
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78 static bool client_handle_args(struct imap_client *client, |
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79 const char *const *args, bool success) |
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80 { |
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81 const char *reason = NULL, *host = NULL, *destuser = NULL, *pass = NULL; |
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82 string_t *reply; |
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83 unsigned int port = 143; |
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84 bool proxy = FALSE, temp = FALSE, nologin = !success; |
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85 |
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86 for (; *args != NULL; args++) { |
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87 if (strcmp(*args, "nologin") == 0) |
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88 nologin = TRUE; |
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89 else if (strcmp(*args, "proxy") == 0) |
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90 proxy = TRUE; |
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91 else if (strcmp(*args, "temp") == 0) |
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92 temp = TRUE; |
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93 else if (strncmp(*args, "reason=", 7) == 0) |
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94 reason = *args + 7; |
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95 else if (strncmp(*args, "host=", 5) == 0) |
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96 host = *args + 5; |
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97 else if (strncmp(*args, "port=", 5) == 0) |
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98 port = atoi(*args + 5); |
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99 else if (strncmp(*args, "destuser=", 9) == 0) |
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100 destuser = *args + 9; |
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101 else if (strncmp(*args, "pass=", 5) == 0) |
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102 pass = *args + 5; |
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103 } |
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104 |
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105 if (destuser == NULL) |
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106 destuser = client->common.virtual_user; |
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107 |
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108 if (proxy && |
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109 !login_proxy_is_ourself(&client->common, host, port, destuser)) { |
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110 /* we want to proxy the connection to another server. |
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111 don't do this unless authentication succeeded. with |
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112 master user proxying we can get FAIL with proxy still set. |
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113 |
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114 proxy host=.. [port=..] [destuser=..] pass=.. */ |
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115 if (!success) |
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116 return FALSE; |
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117 if (imap_proxy_new(client, host, port, destuser, pass) < 0) |
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118 client_destroy_internal_failure(client); |
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119 return TRUE; |
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120 } |
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121 |
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122 if (!proxy && host != NULL) { |
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123 /* IMAP referral |
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124 |
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125 [nologin] referral host=.. [port=..] [destuser=..] |
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126 [reason=..] |
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127 |
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128 NO [REFERRAL imap://destuser;AUTH=..@host:port/] Can't login. |
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129 OK [...] Logged in, but you should use this server instead. |
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130 .. [REFERRAL ..] (Reason from auth server) |
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131 */ |
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132 reply = t_str_new(128); |
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133 str_append(reply, nologin ? "NO " : "OK "); |
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134 str_printfa(reply, "[REFERRAL imap://%s;AUTH=%s@%s", |
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135 destuser, client->common.auth_mech_name, host); |
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136 if (port != 143) |
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137 str_printfa(reply, ":%u", port); |
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138 str_append(reply, "/] "); |
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139 if (reason != NULL) |
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140 str_append(reply, reason); |
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141 else if (nologin) |
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142 str_append(reply, "Try this server instead."); |
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143 else { |
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144 str_append(reply, "Logged in, but you should use " |
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145 "this server instead."); |
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146 } |
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147 client_send_tagline(client, str_c(reply)); |
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148 if (!nologin) { |
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149 client_destroy(client, "Login with referral"); |
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150 return TRUE; |
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151 } |
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152 } else if (nologin) { |
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153 /* Authentication went ok, but for some reason user isn't |
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154 allowed to log in. Shouldn't probably happen. */ |
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155 reply = t_str_new(128); |
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156 if (reason != NULL) |
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157 str_printfa(reply, "NO %s", reason); |
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158 else if (temp) |
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159 str_append(reply, "NO "AUTH_TEMP_FAILED_MSG); |
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160 else |
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161 str_append(reply, "NO "AUTH_FAILED_MSG); |
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162 client_send_tagline(client, str_c(reply)); |
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163 } else { |
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164 /* normal login/failure */ |
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165 return FALSE; |
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166 } |
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167 |
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168 i_assert(nologin); |
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169 |
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170 if (!client->destroyed) { |
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171 /* get back to normal client input. */ |
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172 if (client->io != NULL) |
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173 io_remove(&client->io); |
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174 client->io = io_add(client->common.fd, IO_READ, |
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175 client_input, client); |
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176 } |
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177 return TRUE; |
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178 } |
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179 |
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180 static void sasl_callback(struct client *_client, enum sasl_server_reply reply, |
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181 const char *data, const char *const *args) |
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182 { |
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183 struct imap_client *client = (struct imap_client *)_client; |
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184 struct const_iovec iov[3]; |
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185 const char *msg; |
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186 size_t data_len; |
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187 |
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188 i_assert(!client->destroyed || |
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189 reply == SASL_SERVER_REPLY_CLIENT_ERROR || |
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190 reply == SASL_SERVER_REPLY_MASTER_FAILED); |
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191 |
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192 switch (reply) { |
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193 case SASL_SERVER_REPLY_SUCCESS: |
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194 if (args != NULL) { |
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195 if (client_handle_args(client, args, TRUE)) |
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196 break; |
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197 } |
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198 |
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199 client_send_tagline(client, "OK Logged in."); |
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200 client_destroy(client, "Login"); |
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201 break; |
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202 case SASL_SERVER_REPLY_AUTH_FAILED: |
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203 case SASL_SERVER_REPLY_CLIENT_ERROR: |
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204 if (args != NULL) { |
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205 if (client_handle_args(client, args, FALSE)) |
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206 break; |
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207 } |
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208 |
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209 msg = reply == SASL_SERVER_REPLY_AUTH_FAILED ? "NO " : "BAD "; |
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210 msg = t_strconcat(msg, data != NULL ? data : AUTH_FAILED_MSG, |
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211 NULL); |
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212 client_send_tagline(client, msg); |
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213 |
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214 if (!client->destroyed) { |
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215 /* get back to normal client input. */ |
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216 if (client->io != NULL) |
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217 io_remove(&client->io); |
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218 client->io = io_add(client->common.fd, IO_READ, |
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219 client_input, client); |
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220 } |
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221 break; |
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222 case SASL_SERVER_REPLY_MASTER_FAILED: |
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223 if (data == NULL) |
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224 client_destroy_internal_failure(client); |
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225 else { |
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226 client_send_tagline(client, |
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227 t_strconcat("NO ", data, NULL)); |
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228 client_destroy(client, data); |
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229 } |
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230 break; |
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231 case SASL_SERVER_REPLY_CONTINUE: |
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232 data_len = strlen(data); |
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233 iov[0].iov_base = "+ "; |
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234 iov[0].iov_len = 2; |
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235 iov[1].iov_base = data; |
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236 iov[1].iov_len = data_len; |
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237 iov[2].iov_base = "\r\n"; |
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238 iov[2].iov_len = 2; |
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239 |
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240 /* don't check return value here. it gets tricky if we try |
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241 to call client_destroy() in here. */ |
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242 (void)o_stream_sendv(client->output, iov, 3); |
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243 |
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244 i_assert(client->io == NULL); |
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245 client->io = io_add(client->common.fd, IO_READ, |
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246 client_auth_input, client); |
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247 client_auth_input(client); |
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248 return; |
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249 } |
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250 |
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251 client_unref(client); |
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252 } |
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253 |
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254 int cmd_authenticate(struct imap_client *client, const struct imap_arg *args) |
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255 { |
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256 const char *mech_name, *init_resp = NULL; |
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257 |
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258 /* we want only one argument: authentication mechanism name */ |
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259 if (args[0].type != IMAP_ARG_ATOM && args[0].type != IMAP_ARG_STRING) |
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260 return -1; |
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261 if (args[1].type != IMAP_ARG_EOL) { |
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262 /* optional SASL initial response */ |
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263 if (args[1].type != IMAP_ARG_ATOM || |
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264 args[2].type != IMAP_ARG_EOL) |
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265 return -1; |
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266 init_resp = IMAP_ARG_STR(&args[1]); |
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267 } |
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268 |
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269 mech_name = IMAP_ARG_STR(&args[0]); |
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270 if (*mech_name == '\0') |
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271 return -1; |
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272 |
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273 client_ref(client); |
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274 sasl_server_auth_begin(&client->common, IMAP_SERVICE_NAME, mech_name, |
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275 init_resp, sasl_callback); |
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276 if (!client->common.authenticating) |
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277 return 1; |
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278 |
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279 /* don't handle input until we get the initial auth reply */ |
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280 if (client->io != NULL) |
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281 io_remove(&client->io); |
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282 return 0; |
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283 } |
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284 |
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285 int cmd_login(struct imap_client *client, const struct imap_arg *args) |
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286 { |
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287 const char *user, *pass; |
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288 string_t *plain_login, *base64; |
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289 |
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290 /* two arguments: username and password */ |
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291 if (args[0].type != IMAP_ARG_ATOM && args[0].type != IMAP_ARG_STRING) |
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292 return -1; |
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293 if (args[1].type != IMAP_ARG_ATOM && args[1].type != IMAP_ARG_STRING) |
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294 return -1; |
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295 if (args[2].type != IMAP_ARG_EOL) |
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296 return -1; |
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297 |
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298 user = IMAP_ARG_STR(&args[0]); |
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299 pass = IMAP_ARG_STR(&args[1]); |
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300 |
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301 if (!client->common.secured && disable_plaintext_auth) { |
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302 if (verbose_auth) { |
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303 client_syslog(&client->common, "Login failed: " |
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304 "Plaintext authentication disabled"); |
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305 } |
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306 client->common.auth_tried_disabled_plaintext = TRUE; |
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307 client_send_line(client, |
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308 "* BAD [ALERT] Plaintext authentication is disabled, " |
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309 "but your client sent password in plaintext anyway. " |
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310 "If anyone was listening, the password was exposed."); |
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311 client_send_tagline(client, "NO "AUTH_PLAINTEXT_DISABLED_MSG); |
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312 return 1; |
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313 } |
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314 |
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315 /* authorization ID \0 authentication ID \0 pass */ |
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316 plain_login = buffer_create_dynamic(pool_datastack_create(), 64); |
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317 buffer_append_c(plain_login, '\0'); |
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318 buffer_append(plain_login, user, strlen(user)); |
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319 buffer_append_c(plain_login, '\0'); |
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320 buffer_append(plain_login, pass, strlen(pass)); |
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321 |
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322 base64 = buffer_create_dynamic(pool_datastack_create(), |
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323 MAX_BASE64_ENCODED_SIZE(plain_login->used)); |
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324 base64_encode(plain_login->data, plain_login->used, base64); |
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325 |
1714 | 326 client_ref(client); |
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327 sasl_server_auth_begin(&client->common, IMAP_SERVICE_NAME, "PLAIN", |
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328 str_c(base64), sasl_callback); |
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329 if (!client->common.authenticating) |
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330 return 1; |
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331 |
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332 /* don't read any input from client until login is finished */ |
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333 if (client->io != NULL) |
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334 io_remove(&client->io); |
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335 |
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336 return 0; |
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337 } |