1 |
nmav |
1.1 |
/* |
2 |
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* Boa, an http server |
3 |
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* Copyright (C) 1995 Paul Phillips <paulp@go2net.com> |
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* Some changes Copyright (C) 1996 Charles F. Randall <crandall@goldsys.com> |
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* Some changes Copyright (C) 1996 Larry Doolittle <ldoolitt@boa.org> |
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* Some changes Copyright (C) 1996-2002 Jon Nelson <jnelson@boa.org> |
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* Portions Copyright (C) 2002 Nikos Mavroyanopoulos <nmav@gnutls.org> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 1, or (at your option) |
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* any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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*/ |
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25 |
nmav |
1.3 |
/* $Id: boa.c,v 1.2 2002/09/23 17:56:41 nmav Exp $*/ |
26 |
nmav |
1.1 |
|
27 |
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#include "boa.h" |
28 |
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#include "ssl.h" |
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#include <sys/resource.h> |
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#ifdef ENABLE_SMP |
31 |
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# include <pthread.h> |
32 |
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33 |
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pthread_t father_id; |
34 |
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35 |
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#endif |
36 |
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37 |
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extern int ssl_params_refresh; |
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39 |
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/* globals */ |
40 |
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int backlog = SO_MAXCONN; |
41 |
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time_t start_time; |
42 |
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43 |
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time_t current_time; |
44 |
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45 |
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46 |
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/* static to boa.c */ |
47 |
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static void fixup_server_root(void); |
48 |
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static socket_type create_server_socket( int port, int); |
49 |
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static void drop_privs(void); |
50 |
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static server_params *smp_init(socket_type server_s[2]); |
51 |
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static int sock_opt = 1; |
52 |
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static int do_fork = 1; |
53 |
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int devnullfd = -1; |
54 |
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55 |
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int main(int argc, char **argv) |
56 |
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{ |
57 |
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int c; /* command line arg */ |
58 |
nmav |
1.3 |
socket_type server_s[2] = {{ -1, 0, 0, 0}, { -1, -1, 0, 0 }}; /* boa socket */ |
59 |
nmav |
1.1 |
server_params *params; |
60 |
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/* set umask to u+rw, u-x, go-rwx */ |
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c = umask(~0600); |
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if (c == -1) { |
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perror("umask"); |
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exit(1); |
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} |
67 |
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68 |
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devnullfd = open("/dev/null", 0); |
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70 |
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/* make STDIN and STDOUT point to /dev/null */ |
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if (devnullfd == -1) { |
72 |
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DIE("can't open /dev/null"); |
73 |
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} |
74 |
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75 |
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if (dup2(devnullfd, STDIN_FILENO) == -1) { |
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DIE("can't dup2 /dev/null to STDIN_FILENO"); |
77 |
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} |
78 |
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79 |
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if (dup2(devnullfd, STDOUT_FILENO) == -1) { |
80 |
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DIE("can't dup2 /dev/null to STDOUT_FILENO"); |
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} |
82 |
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83 |
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/* but first, update timestamp, because log_error_time uses it */ |
84 |
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(void) time(¤t_time); |
85 |
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86 |
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while ((c = getopt(argc, argv, "c:r:d")) != -1) { |
87 |
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switch (c) { |
88 |
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case 'c': |
89 |
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if (server_root) |
90 |
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free(server_root); |
91 |
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server_root = strdup(optarg); |
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if (!server_root) { |
93 |
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perror("strdup (for server_root)"); |
94 |
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exit(1); |
95 |
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} |
96 |
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break; |
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case 'r': |
98 |
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if (chdir(optarg) == -1) { |
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log_error_time(); |
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perror("chdir (to chroot)"); |
101 |
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exit(1); |
102 |
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} |
103 |
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if (chroot(optarg) == -1) { |
104 |
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log_error_time(); |
105 |
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perror("chroot"); |
106 |
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exit(1); |
107 |
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} |
108 |
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if (chdir("/") == -1) { |
109 |
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log_error_time(); |
110 |
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perror("chdir (after chroot)"); |
111 |
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exit(1); |
112 |
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} |
113 |
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break; |
114 |
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case 'd': |
115 |
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do_fork = 0; |
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break; |
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default: |
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fprintf(stderr, "Usage: %s [-c serverroot] [-r chroot] [-d]\n", argv[0]); |
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exit(1); |
120 |
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} |
121 |
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} |
122 |
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123 |
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fixup_server_root(); |
124 |
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read_config_files(); |
125 |
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open_logs(); |
126 |
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127 |
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if ((boa_ssl >= 2 || boa_ssl == 0) && server_port > 0) { |
128 |
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server_s[0] = create_server_socket( server_port, 0); |
129 |
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} |
130 |
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131 |
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if (boa_ssl != 0 && ssl_port > 0) { |
132 |
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server_s[1] = create_server_socket( ssl_port, 1); |
133 |
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} |
134 |
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135 |
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if (server_s[1].socket == -1 && server_s[0].socket == -1) { |
136 |
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log_error_time(); |
137 |
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fprintf(stderr, "Could not initialize sockets\n"); |
138 |
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exit(1); |
139 |
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} |
140 |
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141 |
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init_signals(); |
142 |
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drop_privs(); |
143 |
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create_common_env(); |
144 |
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build_needs_escape(); |
145 |
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146 |
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if (boa_ssl) { |
147 |
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initialize_ssl(); |
148 |
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} |
149 |
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150 |
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if (max_connections < 1) { |
151 |
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struct rlimit rl; |
152 |
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153 |
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/* has not been set explicitly */ |
154 |
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c = getrlimit(RLIMIT_NOFILE, &rl); |
155 |
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if (c < 0) { |
156 |
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perror("getrlimit"); |
157 |
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exit(1); |
158 |
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} |
159 |
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max_connections = rl.rlim_cur; |
160 |
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} |
161 |
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162 |
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/* background ourself */ |
163 |
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if (do_fork) { |
164 |
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switch(fork()) { |
165 |
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case -1: |
166 |
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/* error */ |
167 |
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perror("fork"); |
168 |
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exit(1); |
169 |
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break; |
170 |
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case 0: |
171 |
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/* child, success */ |
172 |
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break; |
173 |
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default: |
174 |
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/* parent, success */ |
175 |
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exit(0); |
176 |
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break; |
177 |
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} |
178 |
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} |
179 |
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180 |
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/* main loop */ |
181 |
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timestamp(); |
182 |
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183 |
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start_time = current_time; |
184 |
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185 |
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/* Blocks signals that are not supposed to be catched |
186 |
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* by the children. |
187 |
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*/ |
188 |
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block_main_signals(); |
189 |
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190 |
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/* spawn the children pool |
191 |
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*/ |
192 |
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params = smp_init( server_s); |
193 |
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194 |
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/* unblock signals for daddy |
195 |
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*/ |
196 |
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unblock_main_signals(); |
197 |
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198 |
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/* regenerate parameters in that time interval |
199 |
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*/ |
200 |
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if (boa_ssl) { |
201 |
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alarm( ssl_params_refresh); |
202 |
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} |
203 |
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204 |
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select_loop( params); |
205 |
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206 |
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return 0; |
207 |
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} |
208 |
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209 |
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server_params *global_server_params; |
210 |
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int global_server_params_size; |
211 |
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212 |
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extern int server_max_threads; |
213 |
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214 |
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/* This function will return a server_params pointer. This |
215 |
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* pointer is to be used as a pointer to the select loop. |
216 |
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*/ |
217 |
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static server_params* smp_init( socket_type server_s[2]) |
218 |
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{ |
219 |
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int i; |
220 |
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server_params *params; |
221 |
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222 |
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#ifdef ENABLE_SMP |
223 |
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pthread_t tid; |
224 |
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int max_threads = server_max_threads; |
225 |
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226 |
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father_id = pthread_self(); |
227 |
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#else |
228 |
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const int max_threads = 1; |
229 |
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#endif |
230 |
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231 |
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params = malloc( sizeof(server_params) * max_threads); |
232 |
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if (params == NULL) { |
233 |
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log_error_time(); |
234 |
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fprintf(stderr, |
235 |
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"Could not allocate memory.\n"); |
236 |
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exit(1); |
237 |
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} |
238 |
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239 |
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for (i=0;i<max_threads;i++) { |
240 |
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params[i].server_s[0] = server_s[0]; |
241 |
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params[i].server_s[1] = server_s[1]; |
242 |
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params[i].request_ready = NULL; |
243 |
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params[i].request_block = NULL; |
244 |
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params[i].request_free = NULL; |
245 |
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246 |
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/* for signal handling */ |
247 |
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params[i].sighup_flag = 0; |
248 |
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params[i].sigchld_flag = 0; |
249 |
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params[i].sigalrm_flag = 0; |
250 |
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params[i].sigusr1_flag = 0; |
251 |
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params[i].sigterm_flag = 0; |
252 |
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253 |
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params[i].sockbufsize = SOCKETBUF_SIZE; |
254 |
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255 |
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params[i].status.requests = 0; |
256 |
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params[i].status.errors = 0; |
257 |
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258 |
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params[i].total_connections = 0; |
259 |
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params[i].max_fd = 0; |
260 |
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261 |
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params[i].handle_sigbus = 0; |
262 |
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} |
263 |
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264 |
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#ifdef ENABLE_SMP |
265 |
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params[0].tid = father_id; |
266 |
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267 |
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for( i=1;i<max_threads;i++) { |
268 |
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if (pthread_create( &tid, NULL, &select_loop, ¶ms[i]) != 0) |
269 |
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{ |
270 |
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log_error_time(); |
271 |
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fprintf(stderr, |
272 |
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"Could not dispatch threads.\n"); |
273 |
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exit(1); |
274 |
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} |
275 |
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params[i].tid = tid; |
276 |
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} |
277 |
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#endif |
278 |
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279 |
|
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if (max_threads > 1) { |
280 |
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log_error_time(); |
281 |
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fprintf(stderr, |
282 |
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"Generated pool of %d threads.\n", max_threads); |
283 |
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} |
284 |
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285 |
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global_server_params_size = max_threads; |
286 |
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global_server_params = params; |
287 |
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288 |
|
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return ¶ms[0]; |
289 |
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} |
290 |
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291 |
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void smp_reinit() |
292 |
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{ |
293 |
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#ifdef ENABLE_SMP |
294 |
nmav |
1.2 |
int i; |
295 |
|
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server_params *params = global_server_params; |
296 |
|
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int max_threads = server_max_threads; |
297 |
nmav |
1.1 |
#else |
298 |
nmav |
1.2 |
int max_threads = 1; |
299 |
nmav |
1.1 |
#endif |
300 |
|
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|
301 |
nmav |
1.2 |
if (global_server_params_size < max_threads) { |
302 |
nmav |
1.1 |
log_error_time(); |
303 |
|
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fprintf(stderr, |
304 |
|
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"Cannot increase threads on runtime.\n"); |
305 |
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max_threads = global_server_params_size; |
306 |
nmav |
1.2 |
} |
307 |
nmav |
1.1 |
|
308 |
|
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#ifdef ENABLE_SMP |
309 |
nmav |
1.2 |
for( i=1;i<max_threads;i++) { |
310 |
nmav |
1.1 |
pthread_t tid; |
311 |
|
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if (pthread_create( &tid, NULL, &select_loop, ¶ms[i]) != 0) |
312 |
|
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{ |
313 |
|
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log_error_time(); |
314 |
|
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fprintf(stderr, |
315 |
|
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"Could not dispatch threads.\n"); |
316 |
|
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exit(1); |
317 |
|
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} |
318 |
|
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params[i].tid = tid; |
319 |
nmav |
1.2 |
} |
320 |
nmav |
1.1 |
#endif |
321 |
|
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|
322 |
nmav |
1.2 |
if (max_threads > 0) { |
323 |
nmav |
1.1 |
log_error_time(); |
324 |
|
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fprintf(stderr, |
325 |
|
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"Regenerated a pool of %d threads.\n", max_threads); |
326 |
nmav |
1.2 |
} |
327 |
nmav |
1.1 |
|
328 |
nmav |
1.2 |
return; |
329 |
nmav |
1.1 |
} |
330 |
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|
331 |
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|
332 |
|
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static socket_type create_server_socket( int port, int secure) |
333 |
|
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{ |
334 |
|
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socket_type server_s; |
335 |
|
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|
336 |
|
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server_s.secure = secure; |
337 |
nmav |
1.3 |
server_s.port = port; |
338 |
nmav |
1.1 |
|
339 |
|
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server_s.socket = socket(SERVER_AF, SOCK_STREAM, IPPROTO_TCP); |
340 |
|
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if (server_s.socket == -1) { |
341 |
|
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DIE("unable to create socket"); |
342 |
|
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} |
343 |
|
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|
344 |
|
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/* server socket is nonblocking */ |
345 |
|
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if (set_nonblock_fd(server_s.socket) == -1) { |
346 |
|
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DIE("fcntl: unable to set server socket to nonblocking"); |
347 |
|
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} |
348 |
|
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|
349 |
|
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/* close server socket on exec so cgi's can't write to it */ |
350 |
|
|
if (fcntl(server_s.socket, F_SETFD, 1) == -1) { |
351 |
|
|
DIE("can't set close-on-exec on server socket!"); |
352 |
|
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} |
353 |
|
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|
354 |
|
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/* reuse socket addr */ |
355 |
|
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if ((setsockopt(server_s.socket, SOL_SOCKET, SO_REUSEADDR, (void *) &sock_opt, |
356 |
|
|
sizeof (sock_opt))) == -1) { |
357 |
|
|
DIE("setsockopt"); |
358 |
|
|
} |
359 |
|
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|
360 |
|
|
/* internet family-specific code encapsulated in bind_server() */ |
361 |
|
|
if (bind_server(server_s.socket, server_ip, port) == -1) { |
362 |
|
|
DIE("unable to bind"); |
363 |
|
|
} |
364 |
|
|
|
365 |
|
|
/* listen: large number just in case your kernel is nicely tweaked */ |
366 |
|
|
if (listen(server_s.socket, backlog) == -1) { |
367 |
|
|
DIE("unable to listen"); |
368 |
|
|
} |
369 |
|
|
return server_s; |
370 |
|
|
} |
371 |
|
|
|
372 |
|
|
static void drop_privs(void) |
373 |
|
|
{ |
374 |
|
|
/* give away our privs if we can */ |
375 |
|
|
if (getuid() == 0) { |
376 |
|
|
struct passwd *passwdbuf; |
377 |
|
|
passwdbuf = getpwuid(server_uid); |
378 |
|
|
if (passwdbuf == NULL) { |
379 |
|
|
DIE("getpwuid"); |
380 |
|
|
} |
381 |
|
|
if (initgroups(passwdbuf->pw_name, passwdbuf->pw_gid) == -1) { |
382 |
|
|
DIE("initgroups"); |
383 |
|
|
} |
384 |
|
|
if (setgid(server_gid) == -1) { |
385 |
|
|
DIE("setgid"); |
386 |
|
|
} |
387 |
|
|
if (setuid(server_uid) == -1) { |
388 |
|
|
DIE("setuid"); |
389 |
|
|
} |
390 |
|
|
/* test for failed-but-return-was-successful setuid |
391 |
|
|
* http://www.securityportal.com/list-archive/bugtraq/2000/Jun/0101.html |
392 |
|
|
*/ |
393 |
|
|
if (setuid(0) != -1) { |
394 |
|
|
DIE("icky Linux kernel bug!"); |
395 |
|
|
} |
396 |
|
|
} else { |
397 |
|
|
if (server_gid || server_uid) { |
398 |
|
|
log_error_time(); |
399 |
|
|
fprintf(stderr, "Warning: " |
400 |
|
|
"Not running as root: no attempt to change" |
401 |
|
|
" to uid %d gid %d\n", server_uid, server_gid); |
402 |
|
|
} |
403 |
|
|
server_gid = getgid(); |
404 |
|
|
server_uid = getuid(); |
405 |
|
|
} |
406 |
|
|
} |
407 |
|
|
|
408 |
|
|
/* |
409 |
|
|
* Name: fixup_server_root |
410 |
|
|
* |
411 |
|
|
* Description: Makes sure the server root is valid. |
412 |
|
|
* |
413 |
|
|
*/ |
414 |
|
|
|
415 |
|
|
static void fixup_server_root() |
416 |
|
|
{ |
417 |
|
|
char *dirbuf; |
418 |
|
|
|
419 |
|
|
if (!server_root) { |
420 |
|
|
#ifdef SERVER_ROOT |
421 |
|
|
server_root = strdup(SERVER_ROOT); |
422 |
|
|
if (!server_root) { |
423 |
|
|
perror("strdup (SERVER_ROOT)"); |
424 |
|
|
exit(1); |
425 |
|
|
} |
426 |
|
|
#else |
427 |
|
|
fputs("boa: don't know where server root is. Please #define " |
428 |
|
|
"SERVER_ROOT in boa.h\n" |
429 |
|
|
"and recompile, or use the -c command line option to " |
430 |
|
|
"specify it.\n", stderr); |
431 |
|
|
exit(1); |
432 |
|
|
#endif |
433 |
|
|
} |
434 |
|
|
|
435 |
|
|
if (chdir(server_root) == -1) { |
436 |
|
|
fprintf(stderr, "Could not chdir to \"%s\": aborting\n", |
437 |
|
|
server_root); |
438 |
|
|
exit(1); |
439 |
|
|
} |
440 |
|
|
|
441 |
|
|
dirbuf = normalize_path(server_root); |
442 |
|
|
free(server_root); |
443 |
|
|
server_root = dirbuf; |
444 |
|
|
} |
445 |
|
|
|