82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
#include <sys/types.h>
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#include <err.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <security/pam_constants.h>
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// Exit codes, per src/modules/lokker/lokker.c:
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// 0: success (unlock)
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// 1-128: PAM error but also unlock (!!!)
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// else: failed.
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static char pw[4096];
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struct passwd *pwent;
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static void
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zeropw(void)
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{
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/* security - null out passwd string once we are done with it */
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memset(pw, 0, sizeof(pw));
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if (pw[0] || pw[3]) printf("ACK!\n");
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if (pwent == NULL) return;
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if (pwent->pw_passwd == NULL) return;
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/* security - null out passwd string once we are done with it */
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memset(pwent->pw_passwd, 0, strlen(pwent->pw_passwd));
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if (pwent->pw_passwd[0]) printf("ACK!\n");
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}
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int
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main(int argc, char **argv)
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{
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ssize_t rd;
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uid_t id;
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int i;
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for (i = 1; i < argc; i++)
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{
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if ((!strcmp(argv[i], "-h")) ||
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(!strcmp(argv[i], "-help")) ||
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(!strcmp(argv[i], "--help")))
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{
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printf("This is an internal tool for Enlightenment.\n"
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"do not use it.\n");
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exit(129);
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}
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}
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if (argc != 1)
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exit(130);
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id = getuid();
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if (atexit(zeropw)) err(131, "atexit");
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rd = read(0, pw, sizeof(pw) - 1);
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if (rd < 0) err(132, "read");
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if (setuid(0) != 0)
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{
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printf("ERROR: UNABLE TO ASSUME ROOT PRIVILEGES\n");
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exit(133);
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}
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if (setgid(0) != 0)
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{
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printf("ERROR: UNABLE TO ASSUME ROOT GROUP PRIVILEGES\n");
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exit(134);
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}
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pwent = getpwuid(id);
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if (pwent == NULL) return -2;
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if (strcmp(crypt(pw, pwent->pw_passwd), pwent->pw_passwd) == 0)
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return 0;
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return -1;
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}
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