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#define _XOPEN_SOURCE 700
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#define PRIVEXEC_LOG_ID "privexec"
#define NOT_RUN (126)
#define NOT_FOUND (127)
#ifndef ARG_MAX
#define ARG_MAX _POSIX_ARG_MAX
#endif
void log_execution(int argc, char *argv[])
{
char cmd[ARG_MAX] = "";
strncat(cmd, argv[1], sizeof(cmd) - 1);
for (int i = 2; i < argc; i++) {
strncat(cmd, " ", sizeof(cmd) - 1);
strncat(cmd, argv[i], sizeof(cmd) - 1);
}
openlog(PRIVEXEC_LOG_ID, LOG_PID, LOG_AUTH);
syslog(LOG_INFO, "UID %jd running \"%s\"", (intmax_t)getuid(), cmd);
closelog();
}
int main(int argc, char *argv[])
{
if (argc < 2 || argv == NULL) {
fprintf(stderr, "%s: missing operands\n", argv[0]);
return NOT_RUN;
}
log_execution(argc, argv);
setuid(geteuid());
execvp(argv[1], argv + 1);
fprintf(stderr, "%s: %s: %s\n", argv[0], argv[1], strerror(errno));
if (errno == ENOENT) {
return NOT_FOUND;
}
return NOT_RUN;
}
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