134 lines
2.3 KiB
C
134 lines
2.3 KiB
C
/*
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** This program checks to see if your version of setreuid works.
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** Compile it, make it setuid root, and run it as yourself (NOT as
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** root). If it won't compile or outputs any MAYDAY messages, don't
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** define HASSETREUID in conf.h.
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**
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** Compilation is trivial -- just "cc t_setreuid.c". Make it setuid,
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** root and then execute it as a non-root user.
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*/
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdio.h>
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#ifdef __hpux
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#define setreuid(r, e) setresuid(r, e, -1)
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#endif
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main()
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{
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int fail = 0;
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uid_t realuid = getuid();
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printuids("initial uids", realuid, 0);
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if (geteuid() != 0)
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{
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printf("SETUP ERROR: re-run setuid root\n");
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exit(1);
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}
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if (getuid() == 0)
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{
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printf("SETUP ERROR: must be run by a non-root user\n");
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exit(1);
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}
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if (setreuid(0, 1) < 0)
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{
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fail++;
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printf("setreuid(0, 1) failure\n");
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}
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printuids("after setreuid(0, 1)", 0, 1);
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if (geteuid() != 1)
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{
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fail++;
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printf("MAYDAY! Wrong effective uid\n");
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}
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/* do activity here */
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if (setreuid(-1, 0) < 0)
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{
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fail++;
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printf("setreuid(-1, 0) failure\n");
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}
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printuids("after setreuid(-1, 0)", 0, 0);
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if (setreuid(realuid, 0) < 0)
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{
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fail++;
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printf("setreuid(%d, 0) failure\n", realuid);
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}
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printuids("after setreuid(realuid, 0)", realuid, 0);
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if (geteuid() != 0)
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{
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fail++;
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printf("MAYDAY! Wrong effective uid\n");
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}
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if (getuid() != realuid)
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{
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fail++;
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printf("MAYDAY! Wrong real uid\n");
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}
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printf("\n");
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if (setreuid(0, 2) < 0)
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{
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fail++;
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printf("setreuid(0, 2) failure\n");
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}
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printuids("after setreuid(0, 2)", 0, 2);
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if (geteuid() != 2)
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{
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fail++;
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printf("MAYDAY! Wrong effective uid\n");
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}
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/* do activity here */
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if (setreuid(-1, 0) < 0)
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{
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fail++;
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printf("setreuid(-1, 0) failure\n");
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}
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printuids("after setreuid(-1, 0)", 0, 0);
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if (setreuid(realuid, 0) < 0)
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{
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fail++;
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printf("setreuid(%d, 0) failure\n", realuid);
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}
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printuids("after setreuid(realuid, 0)", realuid, 0);
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if (geteuid() != 0)
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{
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fail++;
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printf("MAYDAY! Wrong effective uid\n");
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}
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if (getuid() != realuid)
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{
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fail++;
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printf("MAYDAY! Wrong real uid\n");
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}
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if (fail)
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{
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printf("\nThis system cannot use setreuid\n");
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exit(1);
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}
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printf("\nIt is safe to define HASSETREUID on this system\n");
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exit(0);
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}
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printuids(str, r, e)
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char *str;
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int r, e;
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{
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printf("%s (should be %d/%d): r/euid=%d/%d\n", str, r, e,
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getuid(), geteuid());
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}
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