Remove non working SSH1 checkbox.
[people/pmueller/ipfire-2.x.git] / src / misc-progs / sshctrl.c
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900832fa 1/* SmoothWall helper program - sshctrl
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2 *
3 * This program is distributed under the terms of the GNU General Public
4 * Licence. See the file COPYING for details.
5 *
6 * (c) Mark Wormgoor, 2001
7 * Simple program intended to be installed setuid(0) that can be used for
8 * restarting SSHd.
9 *
900832fa 10 * $Id: sshctrl.c,v 1.3 2003/12/11 10:57:34 riddles Exp $
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11 *
12 */
13
14#include <stdio.h>
15#include <stdlib.h>
16#include <unistd.h>
17#include <string.h>
18#include <sys/types.h>
19#include <fcntl.h>
20#include <signal.h>
21#include <errno.h>
22#include "libsmooth.h"
23#include "setuid.h"
24
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25#define BUFFER_SIZE 1024
26
27char command[BUFFER_SIZE];
28
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29int main(int argc, char *argv[])
30{
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31 if (argc < 2) {
32 int fd, config_fd, rc, pid;
33 char buffer[STRING_SIZE], command[STRING_SIZE] = "/bin/sed -e '";
34 struct keyvalue *kv = NULL;
35
36 if (!(initsetuid()))
37 exit(1);
38
39 kv = initkeyvalues();
40 if (!readkeyvalues(kv, CONFIG_ROOT "/remote/settings")){
41 fprintf(stderr, "Cannot read remote access settings\n");
42 exit(1);
43 }
44
45 /* By using O_CREAT with O_EXCL open() will fail if the file already exists,
46 * this prevents 2 copies of sshctrl both trying to edit the config file
47 * at once. It also prevents race conditions, but these shouldn't be
48 * possible as /etc/ssh/ should only be writable by root anyhow
49 */
50
51 if ((config_fd = open( "/etc/ssh/sshd_config.new", O_WRONLY|O_CREAT|O_EXCL, 0644 )) == -1 ){
52 perror("Unable to open new config file");
53 freekeyvalues(kv);
54 exit(1);
55 }
56
701b39d8 57 strlcat(command, "s/^Protocol .*$/Protocol 2/;", STRING_SIZE - 1 );
70db8683 58
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59 if(findkey(kv, "ENABLE_SSH_KEYS", buffer) && !strcmp(buffer,"off"))
60 strlcat(command, "s/^RSAAuthentication .*$/RSAAuthentication no/;" "s/^PubkeyAuthentication .*$/PubkeyAuthentication no/;", STRING_SIZE - 1 );
61 else
62 strlcat(command, "s/^RSAAuthentication .*$/RSAAuthentication yes/;" "s/^PubkeyAuthentication .*$/PubkeyAuthentication yes/;", STRING_SIZE - 1 );
70db8683 63
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64 if(findkey(kv, "ENABLE_SSH_PASSWORDS", buffer) && !strcmp(buffer,"off"))
65 strlcat(command, "s/^PasswordAuthentication .*$/PasswordAuthentication no/;", STRING_SIZE - 1 );
66 else
67 strlcat(command, "s/^PasswordAuthentication .*$/PasswordAuthentication yes/;", STRING_SIZE - 1 );
70db8683 68
ca4c317c 69 if(findkey(kv, "ENABLE_SSH_PORTFW", buffer) && !strcmp(buffer,"on"))
51d1705b 70 strlcat(command, "s/^AllowTcpForwarding .*$/AllowTcpForwarding yes/;", STRING_SIZE - 1 );
70db8683 71 else
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72 strlcat(command, "s/^AllowTcpForwarding .*$/AllowTcpForwarding no/;", STRING_SIZE - 1 );
73
74 if(findkey(kv, "SSH_PORT", buffer) && !strcmp(buffer,"on"))
75 strlcat(command, "s/^Port .*$/Port 22/", STRING_SIZE - 1 );
76 else
77 strlcat(command, "s/^Port .*$/Port 222/", STRING_SIZE - 1 );
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78
79 freekeyvalues(kv);
80
81 snprintf(buffer, STRING_SIZE - 1, "' /etc/ssh/sshd_config >&%d", config_fd );
82 strlcat(command, buffer, STRING_SIZE - 1);
83
84 if((rc = unpriv_system(command,99,99)) != 0){
85 fprintf(stderr, "sed returned bad exit code: %d\n", rc);
86 close(config_fd);
87 unlink("/etc/ssh/sshd_config.new");
88 exit(1);
89 }
90
91 close(config_fd);
92 if (rename("/etc/ssh/sshd_config.new","/etc/ssh/sshd_config") != 0){
93 perror("Unable to replace old config file");
94 unlink("/etc/ssh/sshd_config.new");
95 exit(1);
96 }
97
98 memset(buffer, 0, STRING_SIZE);
99
100 if ((fd = open("/var/run/sshd.pid", O_RDONLY)) != -1){
101 if (read(fd, buffer, STRING_SIZE - 1) == -1)
102 fprintf(stderr, "Couldn't read from pid file\n");
103 else{
104 pid = atoi(buffer);
105 if (pid <= 1)
106 fprintf(stderr, "Bad pid value\n");
107 else{
108 if (kill(pid, SIGTERM) == -1)
109 fprintf(stderr, "Unable to send SIGTERM\n");
110 else
111 unlink("/var/run/sshd.pid");
112 }
113 }
114 close(fd);
115 }
116 else{
117 if (errno != ENOENT){
118 perror("Unable to open pid file");
119 exit(1);
120 }
121 }
122
123 if ((fd = open(CONFIG_ROOT "/remote/enablessh", O_RDONLY)) != -1){
124 close(fd);
125 safe_system("/usr/sbin/sshd");
126 }
127
128 return 0;
70db8683 129 }
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130 else if (strcmp(argv[1], "tempstart") == 0) {
131 safe_system("/usr/local/bin/sshctrl");
132 sleep(5);
133 unlink("/var/ipfire/remote/enablessh");
134 safe_system("cat /var/ipfire/remote/settings | sed 's/ENABLE_SSH=on/ENABLE_SSH=off/' > /var/ipfire/remote/settings2 && mv /var/ipfire/remote/settings2 /var/ipfire/remote/settings");
113cd628 135 safe_system("chown nobody.nobody /var/ipfire/remote/settings");
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136 snprintf(command, BUFFER_SIZE-1, "sleep %s && /usr/local/bin/sshctrl &", argv[2]);
137 safe_system(command);
70db8683 138 }
70db8683 139}