Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/imap-login/client-authenticate.c @ 2736:0f31778d3c34 HEAD

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Changed dovecot-auth protocol to ASCII based. Should be easier now to write replacement server if needed by someone. Also cleaned up/made more consistent auth code. The new code could still use some cleaning though..
author Timo Sirainen <tss@iki.fi>
date Wed, 13 Oct 2004 19:38:32 +0300
parents e2ce951fa8e6
children 26a091f3add6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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46f879c46b45 auth_verbose now affects imap/pop3 login processes too. Every authentication
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parents: 2629
diff changeset
1 /* Copyright (C) 2002-2004 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 "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
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cc0690f92d96 disable_plaintext_auth defaults to yes now. ipv4 127.* and ipv6 ::1
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17 const char *client_authenticate_get_capabilities(int secured)
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18 {
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19 const struct auth_mech_desc *mech;
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20 unsigned int i, count;
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21 string_t *str;
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22
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23 str = t_str_new(128);
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24 mech = auth_client_get_available_mechs(auth_client, &count);
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25 for (i = 0; i < count; i++) {
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26 /* a) transport is secured
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27 b) auth mechanism isn't plaintext
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28 c) we allow insecure authentication
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29 */
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30 if ((mech[i].flags & MECH_SEC_PRIVATE) == 0 &&
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31 (secured || !disable_plaintext_auth ||
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32 (mech[i].flags & MECH_SEC_PLAINTEXT) == 0)) {
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33 str_append_c(str, ' ');
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34 str_append(str, "AUTH=");
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35 str_append(str, mech[i].name);
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36 }
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37 }
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38
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39 return str_c(str);
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40 }
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41
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42 static void client_auth_input(void *context)
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43 {
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44 struct imap_client *client = context;
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45 char *line;
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46
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47 if (!client_read(client))
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48 return;
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50 if (client->skip_line) {
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51 if (i_stream_next_line(client->input) == NULL)
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52 return;
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53
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54 client->skip_line = FALSE;
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55 }
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56
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57 /* @UNSAFE */
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58 line = i_stream_next_line(client->input);
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59 if (line == NULL)
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60 return;
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61
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62 if (strcmp(line, "*") == 0) {
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63 sasl_server_auth_cancel(&client->common,
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64 "Authentication aborted");
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65 return;
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66 }
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67
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68 if (client->common.auth_request == NULL) {
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69 sasl_server_auth_cancel(&client->common,
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70 "Don't send unrequested data");
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71 } else {
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72 auth_client_request_continue(client->common.auth_request, line);
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73 }
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74
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75 /* clear sensitive data */
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76 safe_memset(line, 0, strlen(line));
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77 }
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78
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79 static void sasl_callback(struct client *_client, enum sasl_server_reply reply,
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80 const char *data)
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81 {
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82 struct imap_client *client = (struct imap_client *)_client;
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83 struct const_iovec iov[3];
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84 size_t data_len;
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85 ssize_t ret;
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86
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87 switch (reply) {
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88 case SASL_SERVER_REPLY_SUCCESS:
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89 client_send_tagline(client, "OK Logged in.");
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90 client_destroy(client, t_strconcat(
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91 "Login: ", client->common.virtual_user, NULL));
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92 break;
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93 case SASL_SERVER_REPLY_AUTH_FAILED:
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94 if (data == NULL)
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95 client_send_tagline(client, "Authentication failed");
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96 else {
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97 client_send_tagline(client, t_strconcat(
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98 "NO Authentication failed: ", data, NULL));
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99 }
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100
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101 /* get back to normal client input. */
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102 if (client->io != NULL)
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103 io_remove(client->io);
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104 client->io = io_add(client->common.fd, IO_READ,
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105 client_input, client);
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106 break;
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107 case SASL_SERVER_REPLY_MASTER_FAILED:
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108 client_send_line(client, "* BYE Internal login failure. "
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109 "Refer to server log for more information.");
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110 client_destroy(client, t_strconcat("Internal login failure: ",
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111 client->common.virtual_user,
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112 NULL));
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113 break;
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114 case SASL_SERVER_REPLY_CONTINUE:
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115 data_len = strlen(data);
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116 iov[0].iov_base = "+ ";
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117 iov[0].iov_len = 2;
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118 iov[1].iov_base = data;
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119 iov[1].iov_len = data_len;
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120 iov[2].iov_base = "\r\n";
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121 iov[2].iov_len = 2;
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122
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123 ret = o_stream_sendv(client->output, iov, 3);
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124 if (ret < 0)
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125 client_destroy(client, "Disconnected");
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126 else if ((size_t)ret != 2 + data_len + 2)
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127 client_destroy(client, "Transmit buffer full");
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128 else {
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129 /* continue */
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130 return;
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131 }
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132 break;
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133 }
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134
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135 client_unref(client);
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136 }
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137
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138 int cmd_authenticate(struct imap_client *client, struct imap_arg *args)
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139 {
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140 const char *mech_name;
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141
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142 /* we want only one argument: authentication mechanism name */
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143 if (args[0].type != IMAP_ARG_ATOM && args[0].type != IMAP_ARG_STRING)
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144 return -1;
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145 if (args[1].type != IMAP_ARG_EOL)
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146 return -1;
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147
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148 mech_name = IMAP_ARG_STR(&args[0]);
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149 if (*mech_name == '\0')
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150 return FALSE;
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151
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152 client_ref(client);
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153 sasl_server_auth_begin(&client->common, "IMAP", mech_name, NULL,
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154 sasl_callback);
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155 if (!client->common.authenticating)
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156 return 1;
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157
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158 /* following input data will go to authentication */
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159 if (client->io != NULL)
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160 io_remove(client->io);
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161 client->io = io_add(client->common.fd, IO_READ,
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162 client_auth_input, client);
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163 return 0;
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164 }
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165
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166 int cmd_login(struct imap_client *client, struct imap_arg *args)
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167 {
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168 const char *user, *pass;
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169 string_t *plain_login, *base64;
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170
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171 /* two arguments: username and password */
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172 if (args[0].type != IMAP_ARG_ATOM && args[0].type != IMAP_ARG_STRING)
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173 return -1;
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174 if (args[1].type != IMAP_ARG_ATOM && args[1].type != IMAP_ARG_STRING)
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175 return -1;
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176 if (args[2].type != IMAP_ARG_EOL)
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177 return -1;
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178
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179 user = IMAP_ARG_STR(&args[0]);
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180 pass = IMAP_ARG_STR(&args[1]);
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181
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182 if (!client->common.secured && disable_plaintext_auth) {
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183 if (verbose_auth) {
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184 client_syslog(&client->common, "Login failed: "
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185 "Plaintext authentication disabled");
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186 }
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187 client_send_line(client,
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188 "* BAD [ALERT] Plaintext authentication is disabled, "
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189 "but your client sent password in plaintext anyway. "
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190 "If anyone was listening, the password was exposed.");
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191 client_send_tagline(client,
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192 "NO Plaintext authentication disabled.");
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193 return 1;
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194 }
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195
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196 /* authorization ID \0 authentication ID \0 pass */
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197 plain_login = buffer_create_dynamic(pool_datastack_create(), 64);
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198 buffer_append_c(plain_login, '\0');
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199 buffer_append(plain_login, user, strlen(user));
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200 buffer_append_c(plain_login, '\0');
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201 buffer_append(plain_login, pass, strlen(pass));
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4e77cb0aff21 Added %l, %r and %P variables and mail_log_prefix setting.
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202
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203 base64 = buffer_create_dynamic(pool_datastack_create(),
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204 MAX_BASE64_ENCODED_SIZE(plain_login->used));
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205 base64_encode(plain_login->data, plain_login->used, base64);
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206
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207 client_ref(client);
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208 sasl_server_auth_begin(&client->common, "IMAP", "PLAIN",
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209 str_c(base64), sasl_callback);
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210 if (!client->common.authenticating)
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211 return 1;
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d141e1bfdd63 We never do blocking reads/writes to network anymore. Changed imap and pop3
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diff changeset
212
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213 /* don't read any input from client until login is finished */
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214 if (client->io != NULL) {
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215 io_remove(client->io);
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216 client->io = NULL;
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217 }
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218
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219 return 0;
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220 }