Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/imap-login/client-authenticate.c @ 1725:cc0690f92d96 HEAD
disable_plaintext_auth defaults to yes now. ipv4 127.* and ipv6 ::1
addresses are considered secure however and plaintext authentication is
allowed from them.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Sun, 24 Aug 2003 10:55:23 +0300 |
parents | 96dab004a87a |
children | 2f3d906d99d8 |
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 |
1725
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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) && |
1473
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Don't advertise AUTH=PLAIN in capability if disable_plaintext_auth = yes and
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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); |
1714 | 83 |
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(data_stack_pool, size*2, (size_t)-1); |
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112 buffer_append(buf, "+ ", 2); |
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113 base64_encode(data, size, buf); |
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114 buffer_append(buf, "\r\n", 2); |
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115 |
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116 o_stream_send(client->output, buffer_get_data(buf, NULL), |
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117 buffer_get_used_size(buf)); |
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118 o_stream_flush(client->output); |
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119 |
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120 t_pop(); |
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121 } |
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122 |
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123 static void login_callback(struct auth_request *request, |
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124 struct auth_client_request_reply *reply, |
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125 const unsigned char *data, void *context) |
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126 { |
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127 struct imap_client *client = context; |
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128 const char *error; |
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129 const void *ptr; |
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130 size_t size; |
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131 |
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132 switch (auth_callback(request, reply, data, &client->common, |
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133 master_callback, &error)) { |
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134 case -1: |
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135 /* login failed */ |
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136 client_auth_abort(client, error); |
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137 break; |
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138 |
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139 case 0: |
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140 /* continue */ |
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141 ptr = buffer_get_data(client->plain_login, &size); |
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142 auth_client_request_continue(request, ptr, size); |
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143 |
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144 buffer_set_used_size(client->plain_login, 0); |
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145 break; |
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146 default: |
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147 /* success, we should be able to log in. if we fail, just |
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148 disconnect the client. */ |
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149 client->authenticating = FALSE; |
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150 client_send_tagline(client, "OK Logged in."); |
1714 | 151 client_unref(client); |
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152 } |
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153 } |
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154 |
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155 int cmd_login(struct imap_client *client, struct imap_arg *args) |
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156 { |
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157 const char *user, *pass, *error; |
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158 |
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159 /* two arguments: username and password */ |
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160 if (args[0].type != IMAP_ARG_ATOM && args[0].type != IMAP_ARG_STRING) |
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161 return FALSE; |
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162 if (args[1].type != IMAP_ARG_ATOM && args[1].type != IMAP_ARG_STRING) |
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163 return FALSE; |
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164 if (args[2].type != IMAP_ARG_EOL) |
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165 return FALSE; |
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166 |
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167 user = IMAP_ARG_STR(&args[0]); |
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168 pass = IMAP_ARG_STR(&args[1]); |
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169 |
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170 if (!client->secured && disable_plaintext_auth) { |
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171 client_send_line(client, |
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172 "* BAD [ALERT] Plaintext authentication is disabled, " |
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173 "but your client sent password in plaintext anyway. " |
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174 "If anyone was listening, the password was exposed."); |
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175 client_send_tagline(client, |
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176 "NO Plaintext authentication disabled."); |
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177 return TRUE; |
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178 } |
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179 |
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180 /* authorization ID \0 authentication ID \0 pass */ |
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181 buffer_set_used_size(client->plain_login, 0); |
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182 buffer_append_c(client->plain_login, '\0'); |
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183 buffer_append(client->plain_login, user, strlen(user)); |
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184 buffer_append_c(client->plain_login, '\0'); |
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185 buffer_append(client->plain_login, pass, strlen(pass)); |
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186 |
1714 | 187 client_ref(client); |
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188 client->common.auth_request = |
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189 auth_client_request_new(auth_client, AUTH_MECH_PLAIN, |
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190 AUTH_PROTOCOL_IMAP, login_callback, |
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191 client, &error); |
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192 if (client->common.auth_request == NULL) { |
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193 client_send_tagline(client, t_strconcat( |
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194 "NO Login failed: ", error, NULL)); |
1714 | 195 client_unref(client); |
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196 return TRUE; |
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197 } |
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198 |
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199 /* don't read any input from client until login is finished */ |
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200 if (client->common.io != NULL) { |
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201 io_remove(client->common.io); |
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202 client->common.io = NULL; |
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203 } |
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204 |
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205 client->authenticating = TRUE; |
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206 return TRUE; |
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207 } |
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208 |
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209 static void authenticate_callback(struct auth_request *request, |
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210 struct auth_client_request_reply *reply, |
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211 const unsigned char *data, void *context) |
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212 { |
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213 struct imap_client *client = context; |
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214 const char *error; |
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215 |
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216 switch (auth_callback(request, reply, data, &client->common, |
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217 master_callback, &error)) { |
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218 case -1: |
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219 /* login failed */ |
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220 client_auth_abort(client, error); |
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221 break; |
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222 |
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223 case 0: |
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224 /* continue */ |
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225 client_send_auth_data(client, data, reply->data_size); |
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226 break; |
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227 default: |
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228 /* success, we should be able to log in. if we fail, just |
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229 disconnect the client. */ |
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230 client->authenticating = FALSE; |
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231 client_send_tagline(client, "OK Logged in."); |
1714 | 232 client_unref(client); |
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233 } |
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234 } |
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235 |
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236 static void client_auth_input(void *context) |
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237 { |
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238 struct imap_client *client = context; |
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239 buffer_t *buf; |
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240 char *line; |
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241 size_t linelen, bufsize; |
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242 |
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243 if (!client_read(client)) |
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244 return; |
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245 |
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246 if (client->skip_line) { |
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247 if (i_stream_next_line(client->input) == NULL) |
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248 return; |
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249 |
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250 client->skip_line = FALSE; |
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251 } |
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252 |
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253 /* @UNSAFE */ |
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254 line = i_stream_next_line(client->input); |
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255 if (line == NULL) |
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256 return; |
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257 |
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258 if (strcmp(line, "*") == 0) { |
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259 client_auth_abort(client, "Authentication aborted"); |
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260 return; |
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261 } |
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262 |
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263 linelen = strlen(line); |
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264 buf = buffer_create_static_hard(data_stack_pool, linelen); |
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265 |
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266 if (base64_decode((const unsigned char *) line, linelen, |
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267 NULL, buf) <= 0) { |
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268 /* failed */ |
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269 client_auth_abort(client, "Invalid base64 data"); |
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270 } else if (client->common.auth_request == NULL) { |
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271 client_auth_abort(client, "Don't send unrequested data"); |
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272 } else { |
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273 auth_client_request_continue(client->common.auth_request, |
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274 buffer_get_data(buf, NULL), |
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275 buffer_get_used_size(buf)); |
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276 } |
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277 |
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278 /* clear sensitive data */ |
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279 safe_memset(line, 0, linelen); |
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280 |
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281 bufsize = buffer_get_used_size(buf); |
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282 safe_memset(buffer_free_without_data(buf), 0, bufsize); |
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283 } |
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284 |
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285 int cmd_authenticate(struct imap_client *client, struct imap_arg *args) |
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286 { |
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287 struct auth_mech_desc *mech; |
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288 const char *mech_name, *error; |
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289 |
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290 /* we want only one argument: authentication mechanism name */ |
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291 if (args[0].type != IMAP_ARG_ATOM && args[0].type != IMAP_ARG_STRING) |
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292 return FALSE; |
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293 if (args[1].type != IMAP_ARG_EOL) |
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294 return FALSE; |
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295 |
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296 mech_name = IMAP_ARG_STR(&args[0]); |
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297 if (*mech_name == '\0') |
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298 return FALSE; |
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299 |
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300 mech = auth_mech_find(mech_name); |
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301 if (mech == NULL) { |
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302 client_send_tagline(client, |
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303 "NO Unsupported authentication mechanism."); |
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304 return TRUE; |
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305 } |
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306 |
1725
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disable_plaintext_auth defaults to yes now. ipv4 127.* and ipv6 ::1
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307 if (!client->secured && mech->plaintext && disable_plaintext_auth) { |
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308 client_send_tagline(client, |
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309 "NO Plaintext authentication disabled."); |
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310 return TRUE; |
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311 } |
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312 |
1714 | 313 client_ref(client); |
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314 client->common.auth_request = |
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315 auth_client_request_new(auth_client, mech->mech, |
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316 AUTH_PROTOCOL_IMAP, |
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317 authenticate_callback, |
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318 client, &error); |
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319 if (client->common.auth_request != NULL) { |
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320 /* following input data will go to authentication */ |
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321 if (client->common.io != NULL) |
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322 io_remove(client->common.io); |
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323 client->common.io = io_add(client->common.fd, IO_READ, |
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324 client_auth_input, client); |
1275
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|
325 client->authenticating = TRUE; |
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326 } else { |
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|
327 client_send_tagline(client, t_strconcat( |
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328 "NO Authentication failed: ", error, NULL)); |
1714 | 329 client_unref(client); |
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330 } |
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331 |
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332 return TRUE; |
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333 } |