Mercurial > dovecot > core-2.2

annotate src/pop3-login/pop3-proxy.c @ 3879:928229f8b3e6 HEAD

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deinit, unref, destroy, close, free, etc. functions now take a pointer to their data pointer, and set it to NULL. This makes double-frees less likely to cause security holes.
author Timo Sirainen <tss@iki.fi>
date Sat, 14 Jan 2006 20:47:20 +0200
parents 620a00db2c7c
children 507088c0d511
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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d344be0bb70f Added IMAP and POP3 proxying support.
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1 /* Copyright (C) 2004 Timo Sirainen */
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2
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3 #include "common.h"
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4 #include "ioloop.h"
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5 #include "istream.h"
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6 #include "ostream.h"
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7 #include "base64.h"
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8 #include "safe-memset.h"
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9 #include "str.h"
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10 #include "client.h"
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11 #include "pop3-proxy.h"
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12
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13 static void proxy_input(struct istream *input, struct ostream *output,
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14 void *context)
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15 {
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16 struct pop3_client *client = context;
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17 string_t *str;
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18 const char *line;
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19
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20 if (input == NULL) {
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21 if (client->io != NULL) {
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22 /* remote authentication failed, we're just
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23 freeing the proxy */
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24 return;
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25 }
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26
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27 /* failed for some reason, probably server disconnected */
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28 client_send_line(client,
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29 "-ERR [IN-USE] Temporary login failure.");
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30 client_destroy(client, NULL);
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31 return;
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32 }
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33
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34 switch (i_stream_read(input)) {
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35 case -2:
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36 /* buffer full */
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37 i_error("pop-proxy(%s): Remote input buffer full",
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38 client->common.virtual_user);
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39 client_destroy_internal_failure(client);
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40 return;
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41 case -1:
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42 /* disconnected */
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43 client_destroy(client, "Proxy: Remote disconnected");
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44 return;
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45 }
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46
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47 line = i_stream_next_line(input);
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48 if (line == NULL)
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49 return;
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50
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51 switch (client->proxy_state) {
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52 case 0:
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53 /* this is a banner */
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54 if (strncmp(line, "+OK", 3) != 0) {
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55 i_error("pop3-proxy(%s): "
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56 "Remote returned invalid banner: %s",
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57 client->common.virtual_user, line);
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58 client_destroy_internal_failure(client);
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59 return;
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60 }
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61
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62 /* send USER command */
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63 str = t_str_new(128);
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64 str_append(str, "USER ");
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65 str_append(str, client->proxy_user);
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66 str_append(str, "\r\n");
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67 (void)o_stream_send(output, str_data(str), str_len(str));
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68
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69 client->proxy_state++;
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70 return;
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71 case 1:
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72 if (strncmp(line, "+OK", 3) != 0)
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73 break;
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74
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75 /* USER successful, send PASS */
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76 str = t_str_new(128);
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77 str_append(str, "PASS ");
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78 str_append(str, client->proxy_password);
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79 str_append(str, "\r\n");
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80 (void)o_stream_send(output, str_data(str),
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81 str_len(str));
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82
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83 safe_memset(client->proxy_password, 0,
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84 strlen(client->proxy_password));
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85 i_free(client->proxy_password);
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86 client->proxy_password = NULL;
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87
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88 client->proxy_state++;
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89 return;
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90 case 2:
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91 if (strncmp(line, "+OK", 3) != 0)
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92 break;
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93
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94 /* Login successful. Send this line to client. */
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95 (void)o_stream_send_str(client->output, line);
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96 (void)o_stream_send(client->output, "\r\n", 2);
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97
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98 login_proxy_detach(client->proxy, client->input,
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99 client->output);
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100
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101 client->proxy = NULL;
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102 client->input = NULL;
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103 client->output = NULL;
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104 client->common.fd = -1;
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105 client_destroy(client,
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106 t_strdup_printf("proxy(%s): started",
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107 client->common.virtual_user));
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108 return;
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109 }
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110
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111 /* Login failed. Send our own failure reply so client can't
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112 figure out if user exists or not just by looking at the
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113 reply string. */
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114 client_send_line(client, "-ERR "AUTH_FAILED_MSG);
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115
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116 /* allow client input again */
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117 i_assert(client->io == NULL);
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118 client->io = io_add(client->common.fd, IO_READ,
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119 client_input, client);
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120
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121 login_proxy_free(client->proxy);
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122 client->proxy = NULL;
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123
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124 if (client->proxy_password != NULL) {
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125 safe_memset(client->proxy_password, 0,
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126 strlen(client->proxy_password));
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127 i_free(client->proxy_password);
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128 client->proxy_password = NULL;
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129 }
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130
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131 i_free(client->proxy_user);
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132 client->proxy_user = NULL;
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133 }
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134
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135 int pop3_proxy_new(struct pop3_client *client, const char *host,
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136 unsigned int port, const char *user, const char *password)
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137 {
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138 i_assert(user != NULL);
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139
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140 if (password == NULL) {
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141 i_error("proxy(%s): password not given",
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142 client->common.virtual_user);
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143 return -1;
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144 }
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145
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146 client->proxy = login_proxy_new(&client->common, host, port,
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147 proxy_input, client);
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148 if (client->proxy == NULL)
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149 return -1;
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150
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151 client->proxy_state = 0;
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152 client->proxy_user = i_strdup(user);
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153 client->proxy_password = i_strdup(password);
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154
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155 /* disable input until authentication is finished */
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156 if (client->io != NULL)
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157 io_remove(&client->io);
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158 return 0;
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159 }