43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <unistd.h>
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int main(int argc, char *argv[])
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{
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if(argc < 3)
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{
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printf("Usage: %s username command [args]\n", argv[0]);
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return 1;
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}
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else
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{
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char *username = argv[1];
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/* Query password entry for the user */
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struct passwd *pwentry = getpwnam(username);
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if(pwentry == NULL)
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{
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fprintf(stderr, "Cannot find password entry for user: %s\n", username);
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return 1;
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}
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/* Change user permissions to the requested user */
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if(setgid(pwentry->pw_gid) == 0 && setuid(pwentry->pw_uid) == 0)
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{
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/* Exec into the requested process */
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char **cmd_argv = argv + 2;
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execvp(cmd_argv[0], cmd_argv);
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fprintf(stderr, "Cannot execute command: %s\n", cmd_argv[0]);
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return 1;
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}
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else
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{
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fprintf(stderr, "Cannot change into user: %s with corresponding group!\n", username);
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return 1;
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}
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}
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}
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