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- #define _XOPEN_SOURCE 700
- #include <errno.h>
- #include <grp.h>
- #include <locale.h>
- #include <stdarg.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <syslog.h>
- #include <pwd.h>
- #include <unistd.h>
- #include "check.h"
- static char *progname = NULL;
- void fatal(int include_errno, char *fmt, ...)
- {
- fprintf(stderr, "%s: ", progname);
- va_list ap;
- va_start(ap, fmt);
- vfprintf(stderr, fmt, ap);
- va_end(ap);
- if (include_errno) {
- fprintf(stderr, ": %s", strerror(errno));
- }
- fputc('\n', stderr);
- exit(EXIT_FAILURE);
- }
- static char *get_username(void)
- {
- struct passwd *pwd = getpwuid(getuid());
- if (pwd == NULL) {
- fatal(1, "unable to determine user name");
- }
- return pwd->pw_name;
- }
- static char *get_groupname(void)
- {
- struct group *grp = getgrgid(getgid());
- if (grp == NULL) {
- fatal(1, "unable to determine group name");
- }
- return grp->gr_name;
- }
- static char *get_command(int argc, char *argv[])
- {
- if (argc < 2) {
- fatal(1, "missing operands");
- }
- return argv[1];
- }
- int main(int argc, char *argv[])
- {
- setlocale(LC_ALL, "");
- progname = argv[0];
- char *cmd = get_command(argc, argv);
- char *user = get_username();
- char *group = get_groupname();
- openlog(PRIVEXEC_LOG_ID, LOG_PID, LOG_AUTH);
- syslog(LOG_INFO, "checking %s:%s for permission to run %s",
- user, group, cmd);
- switch (get_permission(user, group, cmd)) {
- case AUTHENTICATE:
- syslog(LOG_INFO, "%s:%s requires authentication to run %s",
- user, group, cmd);
- if (authenticate(user) != 0) {
- syslog(LOG_NOTICE, "%s:%s failed authentication for %s",
- user, group, cmd);
- fatal(0, "bad authentication");
- }
- /* FALLTHRU */
- case AUTHORIZED:
- syslog(LOG_INFO, "%s:%s authorized to run %s",
- user, group, cmd);
- return 0;
- case DENIED:
- syslog(LOG_NOTICE,
- "%s:%s explicitly denied permission to run %s",
- user, group, cmd);
- fatal(0, "explicitly denied");
- return 1;
-
- case UNKNOWN:
- default:
- syslog(LOG_NOTICE,
- "%s:%s denied permission to run %s by default",
- user, group, cmd);
- fatal(0, "denied by default");
- }
- return 1;
- }
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