Mercurial > dovecot > core-2.2

annotate src/director/login-connection.c @ 17467:899cf87a687c

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director: Fixed crash if master_user_separator is set, but we didn't do a proxy lookup. Found by Coverity
author Timo Sirainen <tss@iki.fi>
date Fri, 13 Jun 2014 00:57:06 +0300
parents add8c00fb3cc
children a7e830b9b967
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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add8c00fb3cc Updated copyright notices to include year 2014.
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1 /* Copyright (c) 2010-2014 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "ioloop.h"
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5 #include "net.h"
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6 #include "ostream.h"
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7 #include "llist.h"
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8 #include "master-service.h"
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9 #include "director.h"
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10 #include "director-request.h"
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11 #include "auth-connection.h"
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12 #include "login-connection.h"
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13
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14 #include <unistd.h>
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15
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16 struct login_connection {
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17 struct login_connection *prev, *next;
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18
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19 int refcount;
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20
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21 int fd;
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22 struct io *io;
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23 struct ostream *output;
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24 struct auth_connection *auth;
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25 struct director *dir;
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26
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27 unsigned int destroyed:1;
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28 unsigned int userdb:1;
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29 };
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30
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31 struct login_host_request {
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32 struct login_connection *conn;
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33 char *line, *username;
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34 };
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35
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36 static struct login_connection *login_connections;
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37
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38 static void login_connection_unref(struct login_connection **_conn);
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39
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40 static void login_connection_input(struct login_connection *conn)
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41 {
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42 unsigned char buf[4096];
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43 ssize_t ret;
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44
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45 ret = read(conn->fd, buf, sizeof(buf));
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46 if (ret <= 0) {
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47 if (ret < 0) {
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48 if (errno == EAGAIN)
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49 return;
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50 if (errno != ECONNRESET)
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51 i_error("read(login connection) failed: %m");
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52 }
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53 login_connection_deinit(&conn);
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54 return;
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55 }
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56 auth_connection_send(conn->auth, buf, ret);
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57 }
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58
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59 static void
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60 login_connection_send_line(struct login_connection *conn, const char *line)
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61 {
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62 struct const_iovec iov[2];
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63
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64 if (conn->destroyed)
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65 return;
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66
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67 iov[0].iov_base = line;
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68 iov[0].iov_len = strlen(line);
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69 iov[1].iov_base = "\n";
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70 iov[1].iov_len = 1;
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71 o_stream_nsendv(conn->output, iov, N_ELEMENTS(iov));
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72 }
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73
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74 static void
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75 login_host_callback(const struct ip_addr *ip, const char *errormsg,
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76 void *context)
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77 {
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78 struct login_host_request *request = context;
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79 struct director *dir = request->conn->dir;
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80 const char *line, *line_params;
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81 unsigned int secs;
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82
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83 if (ip != NULL) {
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84 secs = dir->set->director_user_expire / 2;
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85 line = t_strdup_printf("%s\thost=%s\tproxy_refresh=%u",
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86 request->line, net_ip2addr(ip), secs);
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87 } else {
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88 if (strncmp(request->line, "OK\t", 3) == 0)
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89 line_params = request->line + 3;
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90 else if (strncmp(request->line, "PASS\t", 5) == 0)
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91 line_params = request->line + 5;
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92 else
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93 i_panic("BUG: Unexpected line: %s", request->line);
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94
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95 i_error("director: User %s host lookup failed: %s",
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96 request->username, errormsg);
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97 line = t_strconcat("FAIL\t", t_strcut(line_params, '\t'),
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98 "\ttemp", NULL);
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99 }
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100 login_connection_send_line(request->conn, line);
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101
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102 login_connection_unref(&request->conn);
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103 i_free(request->username);
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104 i_free(request->line);
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105 i_free(request);
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106 }
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107
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108 static void auth_input_line(const char *line, void *context)
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109 {
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110 struct login_connection *conn = context;
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111 struct login_host_request *request;
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112 const char *const *args, *line_params, *username = NULL;
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113 bool proxy = FALSE, host = FALSE;
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114
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115 if (line == NULL) {
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116 /* auth connection died -> kill also this login connection */
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117 login_connection_deinit(&conn);
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118 return;
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119 }
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120 if (!conn->userdb && strncmp(line, "OK\t", 3) == 0)
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121 line_params = line + 3;
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122 else if (conn->userdb && strncmp(line, "PASS\t", 5) == 0)
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123 line_params = line + 5;
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124 else {
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125 login_connection_send_line(conn, line);
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126 return;
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127 }
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128
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129 /* OK <id> [<parameters>] */
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130 args = t_strsplit_tab(line_params);
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131 if (*args != NULL) {
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132 /* we should always get here, but in case we don't just
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133 forward as-is and let login process handle the error. */
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134 args++;
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135 }
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136
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137 for (; *args != NULL; args++) {
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138 if (strncmp(*args, "proxy", 5) == 0 &&
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139 ((*args)[5] == '=' || (*args)[5] == '\0'))
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140 proxy = TRUE;
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141 else if (strncmp(*args, "host=", 5) == 0)
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142 host = TRUE;
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143 else if (strncmp(*args, "destuser=", 9) == 0)
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144 username = *args + 9;
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145 else if (strncmp(*args, "user=", 5) == 0) {
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146 if (username == NULL)
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147 username = *args + 5;
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148 }
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149 }
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150 if (!proxy || host || username == NULL) {
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151 login_connection_send_line(conn, line);
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152 return;
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153 }
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154 if (*conn->dir->set->master_user_separator != '\0') {
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155 /* with master user logins we still want to use only the
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156 login username */
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157 username = t_strcut(username,
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158 *conn->dir->set->master_user_separator);
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159 }
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160
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161 /* we need to add the host. the lookup might be asynchronous */
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162 request = i_new(struct login_host_request, 1);
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163 request->conn = conn;
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164 request->line = i_strdup(line);
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165 request->username = i_strdup(username);
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166
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167 conn->refcount++;
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168 director_request(conn->dir, username, login_host_callback, request);
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169 }
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170
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171 struct login_connection *
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172 login_connection_init(struct director *dir, int fd,
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173 struct auth_connection *auth, bool userdb)
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174 {
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175 struct login_connection *conn;
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176
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177 conn = i_new(struct login_connection, 1);
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178 conn->refcount = 1;
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179 conn->fd = fd;
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180 conn->auth = auth;
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181 conn->dir = dir;
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182 conn->output = o_stream_create_fd(conn->fd, (size_t)-1, FALSE);
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183 o_stream_set_no_error_handling(conn->output, TRUE);
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184 conn->io = io_add(conn->fd, IO_READ, login_connection_input, conn);
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185 conn->userdb = userdb;
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186
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187 auth_connection_set_callback(conn->auth, auth_input_line, conn);
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188 DLLIST_PREPEND(&login_connections, conn);
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189 return conn;
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190 }
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191
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192 void login_connection_deinit(struct login_connection **_conn)
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193 {
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194 struct login_connection *conn = *_conn;
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195
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196 *_conn = NULL;
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197
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198 if (conn->destroyed)
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199 return;
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200 conn->destroyed = TRUE;
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201
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202 DLLIST_REMOVE(&login_connections, conn);
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203 io_remove(&conn->io);
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204 o_stream_destroy(&conn->output);
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205 if (close(conn->fd) < 0)
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206 i_error("close(login connection) failed: %m");
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207 conn->fd = -1;
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208
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209 auth_connection_deinit(&conn->auth);
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210 login_connection_unref(&conn);
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211
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212 master_service_client_connection_destroyed(master_service);
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213 }
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214
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215 static void login_connection_unref(struct login_connection **_conn)
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216 {
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217 struct login_connection *conn = *_conn;
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218
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219 *_conn = NULL;
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220
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221 i_assert(conn->refcount > 0);
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222 if (--conn->refcount == 0)
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223 i_free(conn);
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224 }
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225
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226 void login_connections_deinit(void)
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227 {
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228 while (login_connections != NULL) {
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229 struct login_connection *conn = login_connections;
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230
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231 login_connection_deinit(&conn);
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232 }
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233 }