alicelinux

A lightweight musl + clang/llvm + libressl + busybox distro
git clone https://codeberg.org/emmett1/alicelinux
Log | Files | Refs | README | LICENSE

busybox-suidwrapper.c (1474B)

      1 #include <unistd.h>
      2 #include <stdio.h>
      3 #include <stdlib.h>
      4 #include <string.h>
      5 #include <libgen.h>
      6 
      7 int main(int argc, char **argv)
      8 {
      9     const char * cmds[] = {
     10         "su",
     11         "ping",
     12         "ping6",
     13         "traceroute",
     14         "passwd",
     15         "login",
     16         "vlock",
     17         "wall",
     18         "crontab" 
     19     };
     20 
     21     const char * baseexec = basename(argv[0]);
     22 
     23     if (!strcmp("busybox-suidwrapper", baseexec))
     24     {
     25         if (argc > 1 && !strcmp("-l", argv[1])){
     26           for (int i = 0; i < sizeof(cmds) / sizeof(cmds[0]); ++i)
     27           {
     28             printf("%s ", cmds[i]);
     29           }
     30           printf("\n");
     31         } else {
     32           printf("busybox SUID wrapper\n\nSupported commands:\n");
     33           printf("Usage:\n -l\tList available SUID commands\n");
     34           if (argc > 1) return 1;
     35         }
     36         return 0;
     37     }
     38 
     39     for (int i = 0; i < sizeof(cmds) / sizeof(cmds[0]); ++i)
     40     {
     41         if (!strcmp(cmds[i], baseexec))
     42         {
     43             char **newargv = malloc(sizeof(char *) * (argc + 2));
     44             newargv[0] = "/bin/busybox";
     45             newargv[1] = (char *)baseexec;
     46             for (int i = 1; i < argc; i++)
     47                 newargv[i + 1] = argv[i];
     48             newargv[argc + 1] = NULL;
     49 
     50             int ret = execv("/bin/busybox", newargv);
     51             free(newargv);
     52             perror(argv[0]);
     53             return ret;
     54         }
     55     }
     56     fprintf(stderr, "%s","error: command not in suid whitelist!\n");
     57     return 1;
     58 }