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Commit | Line | Data |
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900832fa | 1 | /* SmoothWall helper program - sshctrl |
70db8683 CS |
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 $ |
70db8683 CS |
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 | ||
ca4c317c CS |
25 | #define BUFFER_SIZE 1024 |
26 | ||
27 | char command[BUFFER_SIZE]; | |
28 | ||
70db8683 CS |
29 | int main(int argc, char *argv[]) |
30 | { | |
ca4c317c CS |
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 .*$/Protocol 2/;", STRING_SIZE - 1 ); |
70db8683 | 58 | |
ca4c317c CS |
59 | if(findkey(kv, "ENABLE_SSH_KEYS", buffer) && !strcmp(buffer,"off")) |
60 | strlcat(command, "s/^RSAAuthentication .*$/RSAAuthentication no/;" "s/^PubkeyAuthentication .*$/PubkeyAuthentication no/;", STRING_SIZE - 1 ); | |
61 | else | |
62 | strlcat(command, "s/^RSAAuthentication .*$/RSAAuthentication yes/;" "s/^PubkeyAuthentication .*$/PubkeyAuthentication yes/;", STRING_SIZE - 1 ); | |
70db8683 | 63 | |
ca4c317c CS |
64 | if(findkey(kv, "ENABLE_SSH_PASSWORDS", buffer) && !strcmp(buffer,"off")) |
65 | strlcat(command, "s/^PasswordAuthentication .*$/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 |
51d1705b JPT |
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 ); | |
ca4c317c CS |
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 | } |
ca4c317c CS |
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"); |
ca4c317c CS |
136 | snprintf(command, BUFFER_SIZE-1, "sleep %s && /usr/local/bin/sshctrl &", argv[2]); |
137 | safe_system(command); | |
70db8683 | 138 | } |
70db8683 | 139 | } |