1c2aa98e2SPeter Wemm /* 2c2aa98e2SPeter Wemm ** This program checks to see if your version of seteuid works. 3c2aa98e2SPeter Wemm ** Compile it, make it setuid root, and run it as yourself (NOT as 4c2aa98e2SPeter Wemm ** root). If it won't compile or outputs any MAYDAY messages, don't 5c2aa98e2SPeter Wemm ** define USESETEUID in conf.h. 6c2aa98e2SPeter Wemm ** 7c2aa98e2SPeter Wemm ** NOTE: It is not sufficient to have seteuid in your library. 8c2aa98e2SPeter Wemm ** You must also have saved uids that function properly. 9c2aa98e2SPeter Wemm ** 10c2aa98e2SPeter Wemm ** Compilation is trivial -- just "cc t_seteuid.c". Make it setuid, 11c2aa98e2SPeter Wemm ** root and then execute it as a non-root user. 12c2aa98e2SPeter Wemm */ 13c2aa98e2SPeter Wemm 14c2aa98e2SPeter Wemm #include <sys/types.h> 15c2aa98e2SPeter Wemm #include <unistd.h> 16c2aa98e2SPeter Wemm #include <stdio.h> 17c2aa98e2SPeter Wemm 18c2aa98e2SPeter Wemm #ifdef __hpux 19c2aa98e2SPeter Wemm #define seteuid(e) setresuid(-1, e, -1) 20c2aa98e2SPeter Wemm #endif 21c2aa98e2SPeter Wemm 22c2aa98e2SPeter Wemm main() 23c2aa98e2SPeter Wemm { 24c2aa98e2SPeter Wemm int fail = 0; 25c2aa98e2SPeter Wemm uid_t realuid = getuid(); 26c2aa98e2SPeter Wemm 27c2aa98e2SPeter Wemm printuids("initial uids", realuid, 0); 28c2aa98e2SPeter Wemm 29c2aa98e2SPeter Wemm if (geteuid() != 0) 30c2aa98e2SPeter Wemm { 31c2aa98e2SPeter Wemm printf("SETUP ERROR: re-run setuid root\n"); 32c2aa98e2SPeter Wemm exit(1); 33c2aa98e2SPeter Wemm } 34c2aa98e2SPeter Wemm 35c2aa98e2SPeter Wemm if (getuid() == 0) 36c2aa98e2SPeter Wemm { 37c2aa98e2SPeter Wemm printf("SETUP ERROR: must be run by a non-root user\n"); 38c2aa98e2SPeter Wemm exit(1); 39c2aa98e2SPeter Wemm } 40c2aa98e2SPeter Wemm 41c2aa98e2SPeter Wemm if (seteuid(1) < 0) 42c2aa98e2SPeter Wemm printf("seteuid(1) failure\n"); 43c2aa98e2SPeter Wemm printuids("after seteuid(1)", realuid, 1); 44c2aa98e2SPeter Wemm 45c2aa98e2SPeter Wemm if (geteuid() != 1) 46c2aa98e2SPeter Wemm { 47c2aa98e2SPeter Wemm fail++; 48c2aa98e2SPeter Wemm printf("MAYDAY! Wrong effective uid\n"); 49c2aa98e2SPeter Wemm } 50c2aa98e2SPeter Wemm 51c2aa98e2SPeter Wemm /* do activity here */ 52c2aa98e2SPeter Wemm 53c2aa98e2SPeter Wemm if (seteuid(0) < 0) 54c2aa98e2SPeter Wemm { 55c2aa98e2SPeter Wemm fail++; 56c2aa98e2SPeter Wemm printf("seteuid(0) failure\n"); 57c2aa98e2SPeter Wemm } 58c2aa98e2SPeter Wemm printuids("after seteuid(0)", realuid, 0); 59c2aa98e2SPeter Wemm 60c2aa98e2SPeter Wemm if (geteuid() != 0) 61c2aa98e2SPeter Wemm { 62c2aa98e2SPeter Wemm fail++; 63c2aa98e2SPeter Wemm printf("MAYDAY! Wrong effective uid\n"); 64c2aa98e2SPeter Wemm } 65c2aa98e2SPeter Wemm if (getuid() != realuid) 66c2aa98e2SPeter Wemm { 67c2aa98e2SPeter Wemm fail++; 68c2aa98e2SPeter Wemm printf("MAYDAY! Wrong real uid\n"); 69c2aa98e2SPeter Wemm } 70c2aa98e2SPeter Wemm printf("\n"); 71c2aa98e2SPeter Wemm 72c2aa98e2SPeter Wemm if (seteuid(2) < 0) 73c2aa98e2SPeter Wemm { 74c2aa98e2SPeter Wemm fail++; 75c2aa98e2SPeter Wemm printf("seteuid(2) failure\n"); 76c2aa98e2SPeter Wemm } 77c2aa98e2SPeter Wemm printuids("after seteuid(2)", realuid, 2); 78c2aa98e2SPeter Wemm 79c2aa98e2SPeter Wemm if (geteuid() != 2) 80c2aa98e2SPeter Wemm { 81c2aa98e2SPeter Wemm fail++; 82c2aa98e2SPeter Wemm printf("MAYDAY! Wrong effective uid\n"); 83c2aa98e2SPeter Wemm } 84c2aa98e2SPeter Wemm 85c2aa98e2SPeter Wemm /* do activity here */ 86c2aa98e2SPeter Wemm 87c2aa98e2SPeter Wemm if (seteuid(0) < 0) 88c2aa98e2SPeter Wemm { 89c2aa98e2SPeter Wemm fail++; 90c2aa98e2SPeter Wemm printf("seteuid(0) failure\n"); 91c2aa98e2SPeter Wemm } 92c2aa98e2SPeter Wemm printuids("after seteuid(0)", realuid, 0); 93c2aa98e2SPeter Wemm 94c2aa98e2SPeter Wemm if (geteuid() != 0) 95c2aa98e2SPeter Wemm { 96c2aa98e2SPeter Wemm fail++; 97c2aa98e2SPeter Wemm printf("MAYDAY! Wrong effective uid\n"); 98c2aa98e2SPeter Wemm } 99c2aa98e2SPeter Wemm if (getuid() != realuid) 100c2aa98e2SPeter Wemm { 101c2aa98e2SPeter Wemm fail++; 102c2aa98e2SPeter Wemm printf("MAYDAY! Wrong real uid\n"); 103c2aa98e2SPeter Wemm } 104c2aa98e2SPeter Wemm 105c2aa98e2SPeter Wemm if (fail) 106c2aa98e2SPeter Wemm { 107c2aa98e2SPeter Wemm printf("\nThis system cannot use seteuid\n"); 108c2aa98e2SPeter Wemm exit(1); 109c2aa98e2SPeter Wemm } 110c2aa98e2SPeter Wemm 111c2aa98e2SPeter Wemm printf("\nIt is safe to define USESETEUID on this system\n"); 112c2aa98e2SPeter Wemm exit(0); 113c2aa98e2SPeter Wemm } 114c2aa98e2SPeter Wemm 115c2aa98e2SPeter Wemm printuids(str, r, e) 116c2aa98e2SPeter Wemm char *str; 117c2aa98e2SPeter Wemm int r, e; 118c2aa98e2SPeter Wemm { 119c2aa98e2SPeter Wemm printf("%s (should be %d/%d): r/euid=%d/%d\n", str, r, e, 120c2aa98e2SPeter Wemm getuid(), geteuid()); 121c2aa98e2SPeter Wemm } 122