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running arbitrary commands 

git-svn-id: https://asn1c.svn.sourceforge.net/svnroot/asn1c/trunk@841 59561ff5-6e30-0410-9f3c-9617f08c8826
This commit is contained in:
vlm 2005-03-28 15:31:29 +00:00
parent 1eb4b83b2f
commit 6037b237f9
1 changed files with 28 additions and 12 deletions
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40
asn1c/webcgi/asn1c-suid-helper.c
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@ -12,16 +12,17 @@
*/
int
main(int ac, char **av) {
char **argv;
char cmdPath[32];
char *envp[] = { NULL }; /* Empty environment */
int ret;
int i;
if(ac < 3) {
if(ac < 4) {
setgid(getgid());
setuid(getuid());
fprintf(stderr,
"Usage: %s <chroot-to> <chdir-to> [options]\n", av[0]);
"Usage: %s <chroot-to> <chdir-to> <command> [options]\n",
av[0]);
exit(EX_USAGE);
}
@ -48,20 +49,34 @@ main(int ac, char **av) {
exit(EX_DATAERR);
}
argv = calloc(ac + 1, sizeof(*argv));
if(argv) {
argv[0] = "asn1c";
argv[1] = "-S/skeletons";
memcpy(argv + 2, av + 3, (ac - 3) * sizeof(*argv));
/*
* Add an argument if this is an asn1c compiler.
*/
if(strcmp(av[3], "asn1c") == 0) {
ac -= 2;
av += 2;
av[0] = "asn1c";
av[1] = "-S/skeletons";
i = 2;
strcpy(cmdPath, "/bin/asn1c");
} else {
perror("malloc()");
exit(EX_OSERR);
ac -= 3;
av += 3;
i = 0;
}
if(strlen(av[0]) > sizeof(cmdPath)/2) {
fprintf(stderr, "Insecure command name: %s\n", av[0]);
exit(EX_DATAERR);
}
memcpy(cmdPath, "/bin/", 5);
strcpy(cmdPath + 5, av[0]);
/*
* Check arguments for the permitted alphabet constraints.
*/
for(i = 3; i < ac; i++) {
for(; i < ac; i++) {
char *p;
for(p = av[i];; p++) {
switch(*p) {
@ -80,7 +95,8 @@ main(int ac, char **av) {
}
}
execve("/bin/asn1c", argv, envp);
execve(cmdPath, av, envp);
perror(cmdPath);
exit(EX_UNAVAILABLE);
}