Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/master/login-process.c @ 1055:a72bba3f8a55 HEAD

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Rewrote setting handling. Changed some existing settings also since POP3 support required changes anyway. POP3 seems to be really working now :)
author Timo Sirainen <tss@iki.fi>
date Thu, 30 Jan 2003 19:59:31 +0200
parents 793f05a7e50e
children 6cb5b50aea71
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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 "ioloop.h"
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5 #include "network.h"
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6 #include "ostream.h"
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7 #include "fdpass.h"
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8 #include "fd-close-on-exec.h"
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9 #include "env-util.h"
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10 #include "restrict-access.h"
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11 #include "restrict-process-size.h"
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12 #include "login-process.h"
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13 #include "auth-process.h"
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14 #include "mail-process.h"
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15 #include "master-login-interface.h"
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16
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17 #include <unistd.h>
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18 #include <syslog.h>
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19
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20 struct login_group {
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21 struct login_group *next;
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22
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23 struct login_settings *set;
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24
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25 unsigned int processes;
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26 unsigned int listening_processes;
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27 unsigned int wanted_processes_count;
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28
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29 struct login_process *oldest_nonlisten_process;
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30 struct login_process *newest_nonlisten_process;
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31
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32 const char *executable;
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33 unsigned int process_size;
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34 int *listen_fd, *ssl_listen_fd;
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35 };
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36
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37 struct login_process {
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38 struct login_group *group;
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39 struct login_process *prev_nonlisten, *next_nonlisten;
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40 int refcount;
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41
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42 pid_t pid;
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43 int fd;
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44 struct io *io;
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45 struct ostream *output;
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46 unsigned int initialized:1;
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47 unsigned int listening:1;
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48 unsigned int destroyed:1;
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49 };
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50
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51 struct login_auth_request {
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52 struct login_process *process;
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53 unsigned int tag;
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54
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55 unsigned int login_tag;
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56 int fd;
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57
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58 struct ip_addr ip;
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59 };
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60
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61 static unsigned int auth_id_counter;
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62 static struct timeout *to;
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63
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64 static struct hash_table *processes;
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65 static struct login_group *login_groups;
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66
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67 static void login_process_destroy(struct login_process *p);
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68 static void login_process_unref(struct login_process *p);
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69
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70 static void login_group_create(struct login_settings *login_set)
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71 {
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72 struct login_group *group;
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73
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74 group = i_new(struct login_group, 1);
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75 group->set = login_set;
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76
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77 if (strcmp(login_set->name, "imap") == 0) {
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78 group->executable = set->imap_executable;
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79 group->process_size = set->imap_process_size;
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80 group->listen_fd = &mail_fd[FD_IMAP];
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81 group->ssl_listen_fd = &mail_fd[FD_IMAPS];
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82 } else if (strcmp(login_set->name, "pop3") == 0) {
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83 group->executable = set->pop3_executable;
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84 group->process_size = set->pop3_process_size;
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85 group->listen_fd = &mail_fd[FD_POP3];
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86 group->ssl_listen_fd = &mail_fd[FD_POP3S];
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87 } else
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88 i_panic("Unknown login group name '%s'", login_set->name);
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89
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90 group->next = login_groups;
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91 login_groups = group;
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92 }
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93
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94 static void login_group_destroy(struct login_group *group)
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95 {
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96 i_free(group);
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97 }
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98
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99 void auth_master_callback(struct auth_master_reply *reply,
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100 const unsigned char *data, void *context)
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101 {
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102 struct login_auth_request *request = context;
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103 struct master_login_reply master_reply;
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104
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105 if (reply == NULL || !reply->success)
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106 master_reply.success = FALSE;
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107 else {
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108 struct login_group *group = request->process->group;
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109
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110 master_reply.success =
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111 create_mail_process(request->fd, &request->ip,
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112 group->executable,
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113 group->process_size,
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114 reply, (const char *) data);
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115 }
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116
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117 /* reply to login */
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118 master_reply.tag = request->login_tag;
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119
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120 if (o_stream_send(request->process->output, &master_reply,
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121 sizeof(master_reply)) < 0)
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122 login_process_destroy(request->process);
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123
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124 if (close(request->fd) < 0)
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125 i_error("close(mail client) failed: %m");
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126 login_process_unref(request->process);
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127 i_free(request);
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128 }
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129
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130 static void login_process_mark_nonlistening(struct login_process *p)
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131 {
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132 if (!p->listening) {
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133 i_error("login: received another \"not listening\" "
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134 "notification");
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135 return;
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136 }
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137
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138 p->listening = FALSE;
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139 p->group->listening_processes--;
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140
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141 p->prev_nonlisten = p->group->newest_nonlisten_process;
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142
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143 if (p->group->newest_nonlisten_process != NULL)
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144 p->group->newest_nonlisten_process->next_nonlisten = p;
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145 p->group->newest_nonlisten_process = p;
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146
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147 if (p->group->oldest_nonlisten_process == NULL)
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148 p->group->oldest_nonlisten_process = p;
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149 }
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150
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151 static void login_process_input(void *context)
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152 {
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153 struct login_process *p = context;
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154 struct auth_process *auth_process;
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155 struct login_auth_request *authreq;
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156 struct master_login_request req;
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157 int client_fd, ret;
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158
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159 ret = fd_read(p->fd, &req, sizeof(req), &client_fd);
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160 if (ret != sizeof(req)) {
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161 if (ret == 0) {
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162 /* disconnected, ie. the login process died */
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163 } else if (ret > 0) {
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164 /* req wasn't fully read */
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165 i_error("login: fd_read() couldn't read all req");
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166 } else {
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167 i_error("login: fd_read() failed: %m");
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168 }
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169
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170 if (client_fd != -1) {
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171 if (close(client_fd) < 0)
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172 i_error("close(mail client) failed: %m");
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173 }
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174
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175 login_process_destroy(p);
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176 return;
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177 }
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178
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179 if (client_fd == -1) {
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180 /* just a notification that the login process */
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181 if (!p->initialized) {
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182 /* initialization notify */
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183 p->initialized = TRUE;;
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184 } else {
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185 /* not listening for new connections anymore */
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186 login_process_mark_nonlistening(p);
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187 }
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188 return;
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189 }
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190
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191 fd_close_on_exec(client_fd, TRUE);
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192
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193 /* ask the cookie from the auth process */
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194 authreq = i_new(struct login_auth_request, 1);
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195 p->refcount++;
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196 authreq->process = p;
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197 authreq->tag = ++auth_id_counter;
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198 authreq->login_tag = req.tag;
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199 authreq->fd = client_fd;
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200 authreq->ip = req.ip;
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201
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202 auth_process = auth_process_find(req.auth_pid);
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203 if (auth_process == NULL) {
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204 i_error("login: Authentication process %u doesn't exist",
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205 req.auth_pid);
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206 auth_master_callback(NULL, NULL, authreq);
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207 } else {
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208 auth_process_request(auth_process, p->pid,
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209 req.auth_id, authreq);
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210 }
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211 }
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212
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213 static struct login_process *
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214 login_process_new(struct login_group *group, pid_t pid, int fd)
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215 {
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216 struct login_process *p;
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217
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218 PID_ADD_PROCESS_TYPE(pid, PROCESS_TYPE_LOGIN);
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219
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220 p = i_new(struct login_process, 1);
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221 p->group = group;
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222 p->refcount = 1;
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223 p->pid = pid;
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224 p->fd = fd;
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225 p->listening = TRUE;
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226 p->io = io_add(fd, IO_READ, login_process_input, p);
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227 p->output = o_stream_create_file(fd, default_pool,
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228 sizeof(struct master_login_reply)*10,
410
1f0e7229ee58 Split IOBuffer into mmaped IBuffer, file IBuffer, memory data IBuffer and
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229 IO_PRIORITY_DEFAULT, FALSE);
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230
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db6e288be0e9 Replaced INT_TO_POINTER and POINTER_TO_INT macros with POINTER_CAST and
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231 hash_insert(processes, POINTER_CAST(pid), p);
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232 p->group->processes++;
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233 p->group->listening_processes++;
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234 return p;
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235 }
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236
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237 static void login_process_remove_from_lists(struct login_process *p)
613
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238 {
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diff changeset
239 if (p == p->group->oldest_nonlisten_process)
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240 p->group->oldest_nonlisten_process = p->next_nonlisten;
613
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241 else
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diff changeset
242 p->prev_nonlisten->next_nonlisten = p->next_nonlisten;
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243
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244 if (p == p->group->newest_nonlisten_process)
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245 p->group->newest_nonlisten_process = p->prev_nonlisten;
613
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246 else
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diff changeset
247 p->next_nonlisten->prev_nonlisten = p->prev_nonlisten;
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248
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249 p->next_nonlisten = p->prev_nonlisten = NULL;
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250 }
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251
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252 static void login_process_destroy(struct login_process *p)
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253 {
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254 if (p->destroyed)
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255 return;
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256 p->destroyed = TRUE;
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257
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diff changeset
258 if (!p->initialized && io_loop_is_running(ioloop)) {
1000
0fbafade2d85 If auth/login process died unexpectedly, the exit status or killing signal
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diff changeset
259 i_error("Login process died too early - shutting down");
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260 io_loop_stop(ioloop);
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diff changeset
261 }
613
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262 if (p->listening)
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diff changeset
263 p->group->listening_processes--;
613
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diff changeset
264
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265 o_stream_close(p->output);
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266 io_remove(p->io);
805
5ac361acb316 Marked all non-trivial buffer modifications with @UNSAFE tag. Several
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parents: 801
diff changeset
267 if (close(p->fd) < 0)
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diff changeset
268 i_error("close(login) failed: %m");
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269
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diff changeset
270 if (!p->listening)
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271 login_process_remove_from_lists(p);
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272
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273 p->group->processes--;
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diff changeset
274 hash_remove(processes, POINTER_CAST(p->pid));
613
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275
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276 login_process_unref(p);
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277 }
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278
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279 static void login_process_unref(struct login_process *p)
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280 {
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281 if (--p->refcount > 0)
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282 return;
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283
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284 o_stream_unref(p->output);
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285 i_free(p);
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286 }
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287
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288 static pid_t create_login_process(struct login_group *group)
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289 {
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290 static const char *argv[] = { NULL, NULL };
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291 pid_t pid;
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292 int fd[2];
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293
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294 if (group->set->process_per_connection &&
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295 group->processes - group->listening_processes >=
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296 group->set->max_logging_users) {
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297 if (group->oldest_nonlisten_process != NULL)
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298 login_process_destroy(group->oldest_nonlisten_process);
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299 }
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300
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301 if (group->set->uid == 0)
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302 i_fatal("Login process must not run as root");
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303
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304 /* create communication to process with a socket pair */
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305 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) == -1) {
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306 i_error("socketpair() failed: %m");
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307 return -1;
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308 }
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309
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310 pid = fork();
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311 if (pid < 0) {
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312 (void)close(fd[0]);
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313 (void)close(fd[1]);
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314 i_error("fork() failed: %m");
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315 return -1;
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316 }
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317
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318 if (pid != 0) {
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319 /* master */
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320 fd_close_on_exec(fd[0], TRUE);
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321 login_process_new(group, pid, fd[0]);
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322 (void)close(fd[1]);
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323 return pid;
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324 }
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325
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326 /* move communication handle */
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327 if (dup2(fd[1], LOGIN_MASTER_SOCKET_FD) < 0)
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328 i_fatal("login: dup2(master) failed: %m");
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329 fd_close_on_exec(LOGIN_MASTER_SOCKET_FD, FALSE);
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330
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331 /* move the listen handle */
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332 if (dup2(*group->listen_fd, LOGIN_LISTEN_FD) < 0)
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333 i_fatal("login: dup2(listen_fd) failed: %m");
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334 fd_close_on_exec(LOGIN_LISTEN_FD, FALSE);
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335
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336 /* move the SSL listen handle */
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337 if (!set->ssl_disable) {
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338 if (dup2(*group->ssl_listen_fd, LOGIN_SSL_LISTEN_FD) < 0)
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339 i_fatal("login: dup2(ssl_listen_fd) failed: %m");
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340 } else {
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341 if (dup2(null_fd, LOGIN_SSL_LISTEN_FD) < 0)
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342 i_fatal("login: dup2(ssl_listen_fd) failed: %m");
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343 }
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344 fd_close_on_exec(LOGIN_SSL_LISTEN_FD, FALSE);
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345
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346 /* listen_fds are closed by clean_child_process() */
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347
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348 (void)close(fd[0]);
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349 (void)close(fd[1]);
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350
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351 clean_child_process();
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352
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353 /* setup access environment - needs to be done after
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354 clean_child_process() since it clears environment */
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355 restrict_access_set_env(group->set->user,
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356 group->set->uid, set->login_gid,
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357 set->login_chroot ? set->login_dir : NULL);
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358
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359 if (!set->login_chroot) {
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360 /* no chrooting, but still change to the directory */
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361 if (chdir(set->login_dir) < 0)
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362 i_fatal("chdir(%s) failed: %m", set->login_dir);
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363 }
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364
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365 if (!set->ssl_disable) {
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366 env_put(t_strconcat("SSL_CERT_FILE=",
a72bba3f8a55 Rewrote setting handling. Changed some existing settings also since POP3
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367 set->ssl_cert_file, NULL));
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368 env_put(t_strconcat("SSL_KEY_FILE=", set->ssl_key_file, NULL));
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369 env_put(t_strconcat("SSL_PARAM_FILE=",
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370 set->ssl_parameters_file, NULL));
615
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371 }
0d852af6842e Master process generates DH/RSA parameters now and stores them into file
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diff changeset
372
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diff changeset
373 if (set->disable_plaintext_auth)
697
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374 env_put("DISABLE_PLAINTEXT_AUTH=1");
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diff changeset
375 if (set->verbose_proctitle)
747
db6fb0aa16d1 Let login process also know if verbose process titles are wanted..
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376 env_put("VERBOSE_PROCTITLE=1");
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377
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diff changeset
378 if (group->set->process_per_connection) {
697
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diff changeset
379 env_put("PROCESS_PER_CONNECTION=1");
7814b29d0862 Created env_put() and env_clean() for a bit easier handling of environment
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diff changeset
380 env_put("MAX_LOGGING_USERS=1");
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diff changeset
381 } else {
810
30f6811f4952 Instead of just trusting randomness of authentication cookies between
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diff changeset
382 env_put(t_strdup_printf("MAX_LOGGING_USERS=%u",
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383 group->set->max_logging_users));
613
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384 }
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385
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diff changeset
386 env_put(t_strdup_printf("PROCESS_UID=%s", dec2str(getpid())));
30f6811f4952 Instead of just trusting randomness of authentication cookies between
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parents: 807
diff changeset
387
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diff changeset
388 restrict_process_size(group->set->process_size);
722
0438621d25ff Added virtual memory size limits to processes. Default values are pretty
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parents: 699
diff changeset
389
801
86224ff16bf6 Drop root privileges earlier. Close syslog more later in imap-master when
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parents: 791
diff changeset
390 /* make sure we don't leak syslog fd, but do it last so that
86224ff16bf6 Drop root privileges earlier. Close syslog more later in imap-master when
Timo Sirainen <tss@iki.fi>
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diff changeset
391 any errors above will be logged */
86224ff16bf6 Drop root privileges earlier. Close syslog more later in imap-master when
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392 closelog();
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393
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394 /* hide the path, it's ugly */
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diff changeset
395 argv[0] = strrchr(group->set->executable, '/');
a72bba3f8a55 Rewrote setting handling. Changed some existing settings also since POP3
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diff changeset
396 if (argv[0] == NULL) argv[0] = group->set->executable; else argv[0]++;
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397
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398 execv(group->set->executable, (char **) argv);
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399
801
86224ff16bf6 Drop root privileges earlier. Close syslog more later in imap-master when
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parents: 791
diff changeset
400 i_fatal_status(FATAL_EXEC, "execv(%s) failed: %m", argv[0]);
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401 return -1;
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diff changeset
402 }
3b1985cbc908 Initial revision
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diff changeset
403
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diff changeset
404 void login_process_abormal_exit(pid_t pid)
615
0d852af6842e Master process generates DH/RSA parameters now and stores them into file
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parents: 614
diff changeset
405 {
1055
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diff changeset
406 struct login_process *p;
a72bba3f8a55 Rewrote setting handling. Changed some existing settings also since POP3
Timo Sirainen <tss@iki.fi>
parents: 1039
diff changeset
407
615
0d852af6842e Master process generates DH/RSA parameters now and stores them into file
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diff changeset
408 /* don't start raising the process count if they're dying all
0d852af6842e Master process generates DH/RSA parameters now and stores them into file
Timo Sirainen <tss@iki.fi>
parents: 614
diff changeset
409 the time */
1055
a72bba3f8a55 Rewrote setting handling. Changed some existing settings also since POP3
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diff changeset
410 p = hash_lookup(processes, POINTER_CAST(pid));
a72bba3f8a55 Rewrote setting handling. Changed some existing settings also since POP3
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parents: 1039
diff changeset
411 if (p != NULL)
a72bba3f8a55 Rewrote setting handling. Changed some existing settings also since POP3
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diff changeset
412 p->group->wanted_processes_count = 0;
615
0d852af6842e Master process generates DH/RSA parameters now and stores them into file
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parents: 614
diff changeset
413 }
0d852af6842e Master process generates DH/RSA parameters now and stores them into file
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parents: 614
diff changeset
414
635
90a65c017bf0 SIGHUP reloads now settings. Logged in clients are left untouched, but
Timo Sirainen <tss@iki.fi>
parents: 615
diff changeset
415 static void login_hash_destroy(void *key __attr_unused__, void *value,
90a65c017bf0 SIGHUP reloads now settings. Logged in clients are left untouched, but
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parents: 615
diff changeset
416 void *context __attr_unused__)
90a65c017bf0 SIGHUP reloads now settings. Logged in clients are left untouched, but
Timo Sirainen <tss@iki.fi>
parents: 615
diff changeset
417 {
90a65c017bf0 SIGHUP reloads now settings. Logged in clients are left untouched, but
Timo Sirainen <tss@iki.fi>
parents: 615
diff changeset
418 login_process_destroy(value);
90a65c017bf0 SIGHUP reloads now settings. Logged in clients are left untouched, but
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parents: 615
diff changeset
419 }
90a65c017bf0 SIGHUP reloads now settings. Logged in clients are left untouched, but
Timo Sirainen <tss@iki.fi>
parents: 615
diff changeset
420
90a65c017bf0 SIGHUP reloads now settings. Logged in clients are left untouched, but
Timo Sirainen <tss@iki.fi>
parents: 615
diff changeset
421 void login_processes_destroy_all(void)
90a65c017bf0 SIGHUP reloads now settings. Logged in clients are left untouched, but
Timo Sirainen <tss@iki.fi>
parents: 615
diff changeset
422 {
90a65c017bf0 SIGHUP reloads now settings. Logged in clients are left untouched, but
Timo Sirainen <tss@iki.fi>
parents: 615
diff changeset
423 hash_foreach(processes, login_hash_destroy, NULL);
90a65c017bf0 SIGHUP reloads now settings. Logged in clients are left untouched, but
Timo Sirainen <tss@iki.fi>
parents: 615
diff changeset
424
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diff changeset
425 while (login_groups != NULL) {
a72bba3f8a55 Rewrote setting handling. Changed some existing settings also since POP3
Timo Sirainen <tss@iki.fi>
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diff changeset
426 struct login_group *group = login_groups;
a72bba3f8a55 Rewrote setting handling. Changed some existing settings also since POP3
Timo Sirainen <tss@iki.fi>
parents: 1039
diff changeset
427
a72bba3f8a55 Rewrote setting handling. Changed some existing settings also since POP3
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parents: 1039
diff changeset
428 login_groups = group->next;
a72bba3f8a55 Rewrote setting handling. Changed some existing settings also since POP3
Timo Sirainen <tss@iki.fi>
parents: 1039
diff changeset
429 login_group_destroy(group);
a72bba3f8a55 Rewrote setting handling. Changed some existing settings also since POP3
Timo Sirainen <tss@iki.fi>
parents: 1039
diff changeset
430 }
a72bba3f8a55 Rewrote setting handling. Changed some existing settings also since POP3
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parents: 1039
diff changeset
431 }
a72bba3f8a55 Rewrote setting handling. Changed some existing settings also since POP3
Timo Sirainen <tss@iki.fi>
parents: 1039
diff changeset
432
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433 static void login_group_start_missings(struct login_group *group)
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434 {
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435 if (!group->set->process_per_connection) {
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436 /* create max. one process every second, that way if it keeps
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437 dying all the time we don't eat all cpu with fork()ing. */
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438 if (group->listening_processes < group->set->processes_count)
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439 (void)create_login_process(group);
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440 return;
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441 }
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442
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443 /* we want to respond fast when multiple clients are connecting
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444 at once, but we also want to prevent fork-bombing. use the
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445 same method as apache: check once a second if we need new
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446 processes. if yes and we've used all the existing processes,
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447 double their amount (unless we've hit the high limit).
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448 Then for each second that didn't use all existing processes,
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449 drop the max. process count by one. */
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450 if (group->wanted_processes_count < group->set->processes_count)
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451 group->wanted_processes_count = group->set->processes_count;
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452 else if (group->listening_processes == 0)
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453 group->wanted_processes_count *= 2;
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454 else if (group->wanted_processes_count > group->set->processes_count)
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455 group->wanted_processes_count--;
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456
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457 if (group->wanted_processes_count > group->set->max_processes_count)
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458 group->wanted_processes_count = group->set->max_processes_count;
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459
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460 while (group->listening_processes < group->wanted_processes_count)
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461 (void)create_login_process(group);
635
90a65c017bf0 SIGHUP reloads now settings. Logged in clients are left untouched, but
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462 }
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463
903
fd8888f6f037 Naming style changes, finally got tired of most of the typedefs. Also the
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464 static void
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f782b3319553 Removed useless parameters from io_callback_t and timeout_callback_t.
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465 login_processes_start_missing(void *context __attr_unused__)
0
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466 {
1055
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467 struct login_group *group;
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468 struct login_settings *login;
614
e60620644af3 login_process_per_connection = yes scales now better when multiple users are
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469
1055
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470 if (login_groups == NULL) {
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471 for (login = set->logins; login != NULL; login = login->next)
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472 login_group_create(login);
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473 }
614
e60620644af3 login_process_per_connection = yes scales now better when multiple users are
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474
1055
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475 for (group = login_groups; group != NULL; group = group->next)
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476 login_group_start_missings(group);
0
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477 }
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478
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479 void login_processes_init(void)
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480 {
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481 auth_id_counter = 0;
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482 login_groups = NULL;
613
1906116a62ce Finally support for handling each login connection in it's own process.
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483
945
501f076f2e74 Rewrote hash table code, works with less memory now. Also some memory
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484 processes = hash_create(default_pool, default_pool, 128, NULL, NULL);
0
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485 to = timeout_add(1000, login_processes_start_missing, NULL);
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486 }
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487
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488 void login_processes_deinit(void)
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489 {
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490 timeout_remove(to);
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491
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492 login_processes_destroy_all();
0
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493 hash_destroy(processes);
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494 }