Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/master/login-process.c @ 1275:af685269ead0 HEAD
login: Wait until we're connected to auth process before executing command
from client.
inetd usage: --group=name can now specify which login group to use. Default
is the binary name before '-' character (ie. imap or pop3).
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Wed, 05 Mar 2003 00:38:07 +0200 |
parents | 2cf2e08a6ee9 |
children | 04ed7a2536cc |
rev | line source |
---|---|
0 | 1 /* Copyright (C) 2002 Timo Sirainen */ |
2 | |
3 #include "common.h" | |
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4 #include "ioloop.h" |
0 | 5 #include "network.h" |
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6 #include "ostream.h" |
0 | 7 #include "fdpass.h" |
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8 #include "fd-close-on-exec.h" |
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9 #include "env-util.h" |
0 | 10 #include "restrict-access.h" |
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11 #include "restrict-process-size.h" |
0 | 12 #include "login-process.h" |
13 #include "auth-process.h" | |
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14 #include "mail-process.h" |
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15 #include "master-login-interface.h" |
0 | 16 |
17 #include <unistd.h> | |
18 #include <syslog.h> | |
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; |
0 | 40 int refcount; |
41 | |
42 pid_t pid; | |
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; |
0 | 48 unsigned int destroyed:1; |
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49 }; |
0 | 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; |
0 | 56 int fd; |
57 | |
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58 struct ip_addr ip; |
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59 }; |
0 | 60 |
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61 static unsigned int auth_id_counter, login_pid_counter; |
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62 static struct timeout *to; |
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63 static struct io *io_listen; |
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64 |
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65 static struct hash_table *processes; |
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66 static struct login_group *login_groups; |
0 | 67 |
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68 static void login_process_destroy(struct login_process *p); |
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69 static void login_process_unref(struct login_process *p); |
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70 static int login_process_init_group(struct login_process *p); |
0 | 71 |
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72 static void login_group_create(struct login_settings *login_set) |
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73 { |
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74 struct login_group *group; |
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75 |
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76 if (strstr(set->protocols, login_set->name) == NULL) { |
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77 /* not enabled */ |
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78 return; |
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79 } |
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80 |
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81 group = i_new(struct login_group, 1); |
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82 group->set = login_set; |
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83 |
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84 if (strcmp(login_set->name, "imap") == 0) { |
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85 group->executable = set->imap_executable; |
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86 group->process_size = set->imap_process_size; |
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87 group->listen_fd = &mail_fd[FD_IMAP]; |
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88 group->ssl_listen_fd = &mail_fd[FD_IMAPS]; |
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89 } else if (strcmp(login_set->name, "pop3") == 0) { |
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90 group->executable = set->pop3_executable; |
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91 group->process_size = set->pop3_process_size; |
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92 group->listen_fd = &mail_fd[FD_POP3]; |
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93 group->ssl_listen_fd = &mail_fd[FD_POP3S]; |
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94 } else |
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95 i_panic("Unknown login group name '%s'", login_set->name); |
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96 |
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97 group->next = login_groups; |
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98 login_groups = group; |
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99 } |
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100 |
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101 static void login_group_destroy(struct login_group *group) |
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102 { |
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103 i_free(group); |
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104 } |
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105 |
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106 void auth_master_callback(struct auth_master_reply *reply, |
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107 const unsigned char *data, void *context) |
0 | 108 { |
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109 struct login_auth_request *request = context; |
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110 struct master_login_reply master_reply; |
0 | 111 |
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112 if (reply == NULL || !reply->success) |
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113 master_reply.success = FALSE; |
0 | 114 else { |
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115 struct login_group *group = request->process->group; |
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116 |
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117 master_reply.success = |
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118 create_mail_process(request->fd, &request->ip, |
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119 group->executable, |
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120 group->process_size, |
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121 reply, (const char *) data); |
0 | 122 } |
123 | |
124 /* reply to login */ | |
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125 master_reply.tag = request->login_tag; |
0 | 126 |
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127 if (o_stream_send(request->process->output, &master_reply, |
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128 sizeof(master_reply)) < 0) |
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129 login_process_destroy(request->process); |
0 | 130 |
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131 if (close(request->fd) < 0) |
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132 i_error("close(mail client) failed: %m"); |
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133 login_process_unref(request->process); |
0 | 134 i_free(request); |
135 } | |
136 | |
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137 static void login_process_mark_nonlistening(struct login_process *p) |
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138 { |
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139 if (!p->listening) { |
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140 i_error("login: received another \"not listening\" " |
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141 "notification"); |
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142 return; |
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143 } |
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144 |
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145 p->listening = FALSE; |
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146 |
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147 if (p->group != NULL) { |
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148 p->group->listening_processes--; |
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149 p->prev_nonlisten = p->group->newest_nonlisten_process; |
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150 |
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151 if (p->group->newest_nonlisten_process != NULL) |
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152 p->group->newest_nonlisten_process->next_nonlisten = p; |
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153 p->group->newest_nonlisten_process = p; |
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154 |
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155 if (p->group->oldest_nonlisten_process == NULL) |
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156 p->group->oldest_nonlisten_process = p; |
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157 } |
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158 } |
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159 |
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160 static struct login_group *login_group_process_find(const char *name) |
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161 { |
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162 struct login_group *group; |
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163 struct login_settings *login; |
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164 |
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165 if (login_groups == NULL) { |
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166 for (login = set->logins; login != NULL; login = login->next) |
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167 login_group_create(login); |
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168 } |
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169 |
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170 for (group = login_groups; group != NULL; group = group->next) { |
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171 if (strcmp(group->set->name, name) == 0) |
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172 return group; |
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173 } |
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174 |
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175 return NULL; |
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176 } |
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177 |
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178 static int login_process_read_group(struct login_process *p) |
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179 { |
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180 struct login_group *group; |
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181 const char *name; |
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182 char buf[256]; |
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183 unsigned int len; |
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184 ssize_t ret; |
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185 |
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186 /* read length */ |
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187 ret = read(p->fd, buf, 1); |
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188 if (ret != 1) |
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189 len = 0; |
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190 else { |
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191 len = buf[0]; |
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192 if (len >= sizeof(buf)) { |
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193 i_error("login: Process name length too large"); |
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194 return FALSE; |
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195 } |
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196 |
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197 ret = read(p->fd, buf, len); |
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198 } |
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199 |
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200 if (ret < 0) |
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201 i_error("login: read() failed: %m"); |
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202 else if (len == 0 || (size_t)ret != len) |
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203 i_error("login: Process name wasn't sent"); |
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204 else { |
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205 name = t_strndup(buf, len); |
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206 group = login_group_process_find(name); |
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207 if (group == NULL) { |
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208 i_error("login: Unknown process group '%s'", name); |
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209 return FALSE; |
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210 } |
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211 |
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212 p->group = group; |
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213 return login_process_init_group(p); |
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214 } |
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215 return FALSE; |
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216 } |
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217 |
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218 static void login_process_input(void *context) |
0 | 219 { |
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220 struct login_process *p = context; |
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221 struct auth_process *auth_process; |
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222 struct login_auth_request *authreq; |
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223 struct master_login_request req; |
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224 int client_fd; |
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225 ssize_t ret; |
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226 |
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227 if (p->group == NULL) { |
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228 /* we want to read the group */ |
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229 if (!login_process_read_group(p)) |
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230 login_process_destroy(p); |
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231 return; |
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232 } |
0 | 233 |
234 ret = fd_read(p->fd, &req, sizeof(req), &client_fd); | |
235 if (ret != sizeof(req)) { | |
236 if (ret == 0) { | |
237 /* disconnected, ie. the login process died */ | |
238 } else if (ret > 0) { | |
239 /* req wasn't fully read */ | |
240 i_error("login: fd_read() couldn't read all req"); | |
241 } else { | |
242 i_error("login: fd_read() failed: %m"); | |
243 } | |
244 | |
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245 if (client_fd != -1) { |
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246 if (close(client_fd) < 0) |
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247 i_error("close(mail client) failed: %m"); |
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248 } |
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249 |
0 | 250 login_process_destroy(p); |
251 return; | |
252 } | |
253 | |
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254 if (client_fd == -1) { |
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255 /* just a notification that the login process */ |
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256 if (!p->initialized) { |
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257 /* initialization notify */ |
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258 p->initialized = TRUE;; |
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259 } else { |
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260 /* not listening for new connections anymore */ |
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261 login_process_mark_nonlistening(p); |
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262 } |
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263 return; |
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264 } |
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265 |
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266 fd_close_on_exec(client_fd, TRUE); |
0 | 267 |
268 /* ask the cookie from the auth process */ | |
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269 authreq = i_new(struct login_auth_request, 1); |
0 | 270 p->refcount++; |
271 authreq->process = p; | |
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272 authreq->tag = ++auth_id_counter; |
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273 authreq->login_tag = req.tag; |
0 | 274 authreq->fd = client_fd; |
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275 authreq->ip = req.ip; |
0 | 276 |
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277 auth_process = auth_process_find(req.auth_pid); |
0 | 278 if (auth_process == NULL) { |
279 i_error("login: Authentication process %u doesn't exist", | |
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280 req.auth_pid); |
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281 auth_master_callback(NULL, NULL, authreq); |
0 | 282 } else { |
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283 auth_process_request(auth_process, p->pid, |
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284 req.auth_id, authreq); |
0 | 285 } |
286 } | |
287 | |
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288 static struct login_process * |
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289 login_process_new(struct login_group *group, pid_t pid, int fd) |
0 | 290 { |
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291 struct login_process *p; |
0 | 292 |
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293 i_assert(pid != 0); |
0 | 294 |
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295 p = i_new(struct login_process, 1); |
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296 p->group = group; |
0 | 297 p->refcount = 1; |
298 p->pid = pid; | |
299 p->fd = fd; | |
613
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300 p->listening = TRUE; |
0 | 301 p->io = io_add(fd, IO_READ, login_process_input, p); |
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302 p->output = o_stream_create_file(fd, default_pool, |
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303 sizeof(struct master_login_reply)*10, |
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304 IO_PRIORITY_DEFAULT, FALSE); |
0 | 305 |
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306 PID_ADD_PROCESS_TYPE(pid, PROCESS_TYPE_LOGIN); |
195
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307 hash_insert(processes, POINTER_CAST(pid), p); |
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308 |
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309 if (p->group != NULL) { |
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310 p->group->processes++; |
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311 p->group->listening_processes++; |
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312 } |
0 | 313 return p; |
314 } | |
315 | |
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316 static void login_process_remove_from_lists(struct login_process *p) |
613
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317 { |
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318 if (p->group == NULL) |
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319 return; |
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320 |
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321 if (p == p->group->oldest_nonlisten_process) |
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322 p->group->oldest_nonlisten_process = p->next_nonlisten; |
613
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323 else |
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324 p->prev_nonlisten->next_nonlisten = p->next_nonlisten; |
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325 |
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326 if (p == p->group->newest_nonlisten_process) |
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327 p->group->newest_nonlisten_process = p->prev_nonlisten; |
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328 else |
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329 p->next_nonlisten->prev_nonlisten = p->prev_nonlisten; |
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330 |
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331 p->next_nonlisten = p->prev_nonlisten = NULL; |
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332 } |
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333 |
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334 static void login_process_destroy(struct login_process *p) |
0 | 335 { |
336 if (p->destroyed) | |
337 return; | |
338 p->destroyed = TRUE; | |
339 | |
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340 if (!p->initialized && io_loop_is_running(ioloop)) { |
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341 i_error("Login process died too early - shutting down"); |
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342 io_loop_stop(ioloop); |
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343 } |
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344 |
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345 if (p->listening && p->group != NULL) |
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346 p->group->listening_processes--; |
613
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347 |
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348 o_stream_close(p->output); |
0 | 349 io_remove(p->io); |
805
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350 if (close(p->fd) < 0) |
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351 i_error("close(login) failed: %m"); |
0 | 352 |
613
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353 if (!p->listening) |
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354 login_process_remove_from_lists(p); |
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355 |
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356 if (p->group != NULL) |
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357 p->group->processes--; |
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358 |
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359 if (p->pid != 0) |
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360 hash_remove(processes, POINTER_CAST(p->pid)); |
613
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361 |
0 | 362 login_process_unref(p); |
363 } | |
364 | |
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365 static void login_process_unref(struct login_process *p) |
0 | 366 { |
367 if (--p->refcount > 0) | |
368 return; | |
369 | |
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370 o_stream_unref(p->output); |
0 | 371 i_free(p); |
372 } | |
373 | |
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374 static void login_process_init_env(struct login_group *group, pid_t pid) |
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375 { |
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376 child_process_init_env(); |
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377 |
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378 /* setup access environment - needs to be done after |
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379 clean_child_process() since it clears environment */ |
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380 restrict_access_set_env(group->set->user, |
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381 group->set->uid, set->login_gid, |
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382 set->login_chroot ? set->login_dir : NULL); |
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383 |
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384 env_put("DOVECOT_MASTER=1"); |
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385 |
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386 if (!set->ssl_disable) { |
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387 env_put(t_strconcat("SSL_CERT_FILE=", |
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388 set->ssl_cert_file, NULL)); |
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389 env_put(t_strconcat("SSL_KEY_FILE=", set->ssl_key_file, NULL)); |
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390 env_put(t_strconcat("SSL_PARAM_FILE=", |
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391 set->ssl_parameters_file, NULL)); |
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392 } |
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393 |
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394 if (set->disable_plaintext_auth) |
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395 env_put("DISABLE_PLAINTEXT_AUTH=1"); |
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396 if (set->verbose_proctitle) |
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397 env_put("VERBOSE_PROCTITLE=1"); |
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398 if (set->verbose_ssl) |
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399 env_put("VERBOSE_SSL=1"); |
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400 |
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401 if (group->set->process_per_connection) { |
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402 env_put("PROCESS_PER_CONNECTION=1"); |
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403 env_put("MAX_LOGGING_USERS=1"); |
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404 } else { |
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405 env_put(t_strdup_printf("MAX_LOGGING_USERS=%u", |
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|
406 group->set->max_logging_users)); |
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407 } |
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408 |
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409 env_put(t_strdup_printf("PROCESS_UID=%s", dec2str(pid))); |
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410 } |
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411 |
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|
412 static pid_t create_login_process(struct login_group *group) |
0 | 413 { |
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414 static const char *argv[] = { NULL, NULL }; |
0 | 415 pid_t pid; |
416 int fd[2]; | |
417 | |
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418 if (group->set->process_per_connection && |
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419 group->processes - group->listening_processes >= |
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420 group->set->max_logging_users) { |
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421 if (group->oldest_nonlisten_process != NULL) |
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422 login_process_destroy(group->oldest_nonlisten_process); |
613
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423 } |
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424 |
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425 if (group->set->uid == 0) |
0 | 426 i_fatal("Login process must not run as root"); |
427 | |
428 /* create communication to process with a socket pair */ | |
429 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) == -1) { | |
430 i_error("socketpair() failed: %m"); | |
431 return -1; | |
432 } | |
433 | |
434 pid = fork(); | |
435 if (pid < 0) { | |
436 (void)close(fd[0]); | |
437 (void)close(fd[1]); | |
438 i_error("fork() failed: %m"); | |
439 return -1; | |
440 } | |
441 | |
442 if (pid != 0) { | |
443 /* master */ | |
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444 net_set_nonblock(fd[0], TRUE); |
727
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445 fd_close_on_exec(fd[0], TRUE); |
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446 (void)login_process_new(group, pid, fd[0]); |
0 | 447 (void)close(fd[1]); |
448 return pid; | |
449 } | |
450 | |
451 /* move the listen handle */ | |
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452 if (dup2(*group->listen_fd, LOGIN_LISTEN_FD) < 0) |
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453 i_fatal("login: dup2(listen_fd) failed: %m"); |
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454 fd_close_on_exec(LOGIN_LISTEN_FD, FALSE); |
0 | 455 |
456 /* move the SSL listen handle */ | |
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457 if (dup2(*group->ssl_listen_fd, LOGIN_SSL_LISTEN_FD) < 0) |
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458 i_fatal("login: dup2(ssl_listen_fd) failed: %m"); |
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459 fd_close_on_exec(LOGIN_SSL_LISTEN_FD, FALSE); |
0 | 460 |
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461 /* move communication handle */ |
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462 if (dup2(fd[1], LOGIN_MASTER_SOCKET_FD) < 0) |
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463 i_fatal("login: dup2(master) failed: %m"); |
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464 fd_close_on_exec(LOGIN_MASTER_SOCKET_FD, FALSE); |
0 | 465 |
466 (void)close(fd[0]); | |
467 (void)close(fd[1]); | |
468 | |
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469 login_process_init_env(group, getpid()); |
0 | 470 |
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471 if (!set->login_chroot) { |
0 | 472 /* no chrooting, but still change to the directory */ |
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473 if (chdir(set->login_dir) < 0) |
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474 i_fatal("chdir(%s) failed: %m", set->login_dir); |
0 | 475 } |
476 | |
1065 | 477 restrict_process_size(group->set->process_size, 0); |
722
0438621d25ff
Added virtual memory size limits to processes. Default values are pretty
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478 |
801
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479 /* make sure we don't leak syslog fd, but do it last so that |
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480 any errors above will be logged */ |
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481 closelog(); |
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482 |
0 | 483 /* hide the path, it's ugly */ |
1055
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484 argv[0] = strrchr(group->set->executable, '/'); |
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485 if (argv[0] == NULL) argv[0] = group->set->executable; else argv[0]++; |
0 | 486 |
1055
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487 execv(group->set->executable, (char **) argv); |
0 | 488 |
801
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489 i_fatal_status(FATAL_EXEC, "execv(%s) failed: %m", argv[0]); |
0 | 490 return -1; |
491 } | |
492 | |
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493 void login_process_abormal_exit(pid_t pid) |
615
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494 { |
1055
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495 struct login_process *p; |
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496 |
615
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497 /* don't start raising the process count if they're dying all |
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498 the time */ |
1055
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499 p = hash_lookup(processes, POINTER_CAST(pid)); |
1275
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500 if (p != NULL && p->group != NULL) |
1055
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501 p->group->wanted_processes_count = 0; |
615
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502 } |
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503 |
635
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SIGHUP reloads now settings. Logged in clients are left untouched, but
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504 static void login_hash_destroy(void *key __attr_unused__, void *value, |
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505 void *context __attr_unused__) |
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506 { |
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507 login_process_destroy(value); |
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508 } |
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|
509 |
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510 void login_processes_destroy_all(void) |
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511 { |
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512 hash_foreach(processes, login_hash_destroy, NULL); |
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SIGHUP reloads now settings. Logged in clients are left untouched, but
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513 |
1055
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Rewrote setting handling. Changed some existing settings also since POP3
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514 while (login_groups != NULL) { |
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515 struct login_group *group = login_groups; |
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516 |
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517 login_groups = group->next; |
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518 login_group_destroy(group); |
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519 } |
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520 } |
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521 |
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522 static void login_group_start_missings(struct login_group *group) |
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523 { |
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|
524 if (!group->set->process_per_connection) { |
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525 /* create max. one process every second, that way if it keeps |
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526 dying all the time we don't eat all cpu with fork()ing. */ |
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527 if (group->listening_processes < group->set->processes_count) |
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528 (void)create_login_process(group); |
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529 return; |
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530 } |
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|
531 |
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Rewrote setting handling. Changed some existing settings also since POP3
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changeset
|
532 /* we want to respond fast when multiple clients are connecting |
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|
533 at once, but we also want to prevent fork-bombing. use the |
a72bba3f8a55
Rewrote setting handling. Changed some existing settings also since POP3
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534 same method as apache: check once a second if we need new |
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|
535 processes. if yes and we've used all the existing processes, |
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Rewrote setting handling. Changed some existing settings also since POP3
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|
536 double their amount (unless we've hit the high limit). |
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Rewrote setting handling. Changed some existing settings also since POP3
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537 Then for each second that didn't use all existing processes, |
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Rewrote setting handling. Changed some existing settings also since POP3
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|
538 drop the max. process count by one. */ |
a72bba3f8a55
Rewrote setting handling. Changed some existing settings also since POP3
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539 if (group->wanted_processes_count < group->set->processes_count) |
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Rewrote setting handling. Changed some existing settings also since POP3
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|
540 group->wanted_processes_count = group->set->processes_count; |
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Rewrote setting handling. Changed some existing settings also since POP3
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|
541 else if (group->listening_processes == 0) |
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Rewrote setting handling. Changed some existing settings also since POP3
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542 group->wanted_processes_count *= 2; |
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Rewrote setting handling. Changed some existing settings also since POP3
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543 else if (group->wanted_processes_count > group->set->processes_count) |
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Rewrote setting handling. Changed some existing settings also since POP3
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|
544 group->wanted_processes_count--; |
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|
545 |
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|
546 if (group->wanted_processes_count > group->set->max_processes_count) |
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547 group->wanted_processes_count = group->set->max_processes_count; |
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548 |
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549 while (group->listening_processes < group->wanted_processes_count) |
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Rewrote setting handling. Changed some existing settings also since POP3
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550 (void)create_login_process(group); |
635
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|
551 } |
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552 |
903
fd8888f6f037
Naming style changes, finally got tired of most of the typedefs. Also the
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553 static void |
1036
f782b3319553
Removed useless parameters from io_callback_t and timeout_callback_t.
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|
554 login_processes_start_missing(void *context __attr_unused__) |
0 | 555 { |
1055
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556 struct login_group *group; |
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557 struct login_settings *login; |
614
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login_process_per_connection = yes scales now better when multiple users are
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558 |
1055
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559 if (login_groups == NULL) { |
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560 for (login = set->logins; login != NULL; login = login->next) |
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|
561 login_group_create(login); |
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562 } |
614
e60620644af3
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diff
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|
563 |
1055
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564 for (group = login_groups; group != NULL; group = group->next) |
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Rewrote setting handling. Changed some existing settings also since POP3
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|
565 login_group_start_missings(group); |
0 | 566 } |
567 | |
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568 static int login_process_send_env(struct login_process *p) |
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569 { |
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570 extern char **environ; |
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571 char **env; |
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572 size_t len; |
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573 int ret = 0; |
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574 |
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575 /* this will clear our environment. luckily we don't need it. */ |
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576 login_process_init_env(p->group, p->pid); |
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577 |
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578 for (env = environ; *env != NULL; env++) { |
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579 len = strlen(*env); |
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580 |
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581 if (o_stream_send(p->output, *env, len) != (ssize_t)len || |
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582 o_stream_send(p->output, "\n", 1) != 1) { |
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583 ret = -1; |
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584 break; |
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585 } |
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586 } |
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587 |
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588 if (ret == 0 && o_stream_send(p->output, "\n", 1) != 1) |
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589 ret = -1; |
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590 |
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591 env_clean(); |
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592 return ret; |
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593 } |
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594 |
1275
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595 static int login_process_init_group(struct login_process *p) |
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596 { |
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597 p->group->processes++; |
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598 p->group->listening_processes++; |
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599 |
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600 if (login_process_send_env(p) < 0) { |
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601 i_error("login: Couldn't send environment"); |
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602 return FALSE; |
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603 } |
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604 |
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605 return TRUE; |
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606 } |
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607 |
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608 static void inetd_login_accept(void *context __attr_unused__) |
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609 { |
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610 struct login_process *p; |
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611 int fd; |
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612 |
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613 fd = net_accept(inetd_login_fd, NULL, NULL); |
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614 if (fd < 0) { |
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615 if (fd < -1) |
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616 i_fatal("accept(inetd_login_fd) failed: %m"); |
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617 } else { |
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618 net_set_nonblock(fd, TRUE); |
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619 fd_close_on_exec(fd, TRUE); |
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620 |
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621 p = login_process_new(NULL, ++login_pid_counter, fd); |
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622 p->initialized = TRUE; |
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623 } |
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624 } |
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625 |
0 | 626 void login_processes_init(void) |
627 { | |
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628 auth_id_counter = 0; |
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629 login_pid_counter = 0; |
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630 login_groups = NULL; |
613
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631 |
945
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Rewrote hash table code, works with less memory now. Also some memory
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632 processes = hash_create(default_pool, default_pool, 128, NULL, NULL); |
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633 if (!IS_INETD()) { |
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634 to = timeout_add(1000, login_processes_start_missing, NULL); |
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635 io_listen = NULL; |
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636 } else { |
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637 to = NULL; |
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638 io_listen = io_add(inetd_login_fd, IO_READ, |
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639 inetd_login_accept, NULL); |
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640 } |
0 | 641 } |
642 | |
643 void login_processes_deinit(void) | |
644 { | |
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645 if (to != NULL) |
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646 timeout_remove(to); |
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647 if (io_listen != NULL) |
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648 io_remove(io_listen); |
0 | 649 |
635
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650 login_processes_destroy_all(); |
0 | 651 hash_destroy(processes); |
652 } |