#include <sys/types.h>
#include <sys/stat.h>
+#include <sys/ioctl.h>
#include <limits.h>
#include <string.h>
#include <grp.h>
#include <syslog.h>
#include <errno.h>
+#if HAVE_SHADOW_H
+#include <shadow.h>
+#endif
#include "includes.h"
static void __dead
usage(void)
{
- fprintf(stderr, "usage: doas [-nsv] [-a style] [-C config] [-u user]"
- " command [args]\n");
+ fprintf(stderr, "usage: doas [-Lnsv] "
+#ifdef HAVE_BSD_AUTH_H
+ "[-a style] "
+#endif
+ "[-C config] [-u user] command [args]\n");
exit(1);
}
-size_t
-arraylen(const char **arr)
-{
- size_t cnt = 0;
-
- if (arr) {
- while (*arr) {
- cnt++;
- arr++;
- }
- }
- return cnt;
-}
-
static int
parseuid(const char *s, uid_t *uid)
{
}
static int
-permit(uid_t uid, gid_t *groups, int ngroups, struct rule **lastr,
+permit(uid_t uid, gid_t *groups, int ngroups, const struct rule **lastr,
uid_t target, const char *cmd, const char **cmdargs)
{
int i;
checkconfig(const char *confpath, int argc, char **argv,
uid_t uid, gid_t *groups, int ngroups, uid_t target)
{
- struct rule *rule;
+ const struct rule *rule;
if (setresuid(uid, uid, uid) != 0)
err(1, "setresuid");
}
}
+#ifdef HAVE_BSD_AUTH_H
+static void
+authuser(char *myname, char *login_style, int persist)
+{
+ char *challenge = NULL, *response, rbuf[1024], cbuf[128];
+ auth_session_t *as;
+ int fd = -1;
+
+ if (persist)
+ fd = open("/dev/tty", O_RDWR);
+ if (fd != -1) {
+ if (ioctl(fd, TIOCCHKVERAUTH) == 0)
+ goto good;
+ }
+
+ if (!(as = auth_userchallenge(myname, login_style, "auth-doas",
+ &challenge)))
+ errx(1, "Authorization failed");
+ if (!challenge) {
+ char host[HOST_NAME_MAX + 1];
+ if (gethostname(host, sizeof(host)))
+ snprintf(host, sizeof(host), "?");
+ snprintf(cbuf, sizeof(cbuf),
+ "\rdoas (%.32s@%.32s) password: ", myname, host);
+ challenge = cbuf;
+ }
+ response = readpassphrase(challenge, rbuf, sizeof(rbuf),
+ RPP_REQUIRE_TTY);
+ if (response == NULL && errno == ENOTTY) {
+ syslog(LOG_AUTHPRIV | LOG_NOTICE,
+ "tty required for %s", myname);
+ errx(1, "a tty is required");
+ }
+ if (!auth_userresponse(as, response, 0)) {
+ syslog(LOG_AUTHPRIV | LOG_NOTICE,
+ "failed auth for %s", myname);
+ errx(1, "Authorization failed");
+ }
+ explicit_bzero(rbuf, sizeof(rbuf));
+good:
+ if (fd != -1) {
+ int secs = 5 * 60;
+ ioctl(fd, TIOCSETVERAUTH, &secs);
+ close(fd);
+ }
+}
+#elif HAVE_SHADOW_H
+static void
+authuser(const char *myname, const char *login_style, int persist)
+{
+ const char *hash;
+ char *encrypted;
+ struct passwd *pw;
+
+ (void)login_style;
+
+#ifdef PERSIST_TIMESTAMP
+ int fd = -1;
+ int valid;
+ if (persist)
+ fd = persist_open(&valid, 5 * 60);
+ if (fd != -1 && valid)
+ goto good;
+#else
+ (void)persist;
+#endif
+
+ if (!(pw = getpwnam(myname)))
+ err(1, "getpwnam");
+
+ hash = pw->pw_passwd;
+ if (hash[0] == 'x' && hash[1] == '\0') {
+ struct spwd *sp;
+ if (!(sp = getspnam(myname)))
+ errx(1, "Authorization failed");
+ hash = sp->sp_pwdp;
+ } else if (hash[0] != '*') {
+ errx(1, "Authorization failed");
+ }
+
+ char *challenge, *response, rbuf[1024], cbuf[128], host[HOST_NAME_MAX + 1];
+ if (gethostname(host, sizeof(host)))
+ snprintf(host, sizeof(host), "?");
+ snprintf(cbuf, sizeof(cbuf),
+ "\rdoas (%.32s@%.32s) password: ", myname, host);
+ challenge = cbuf;
+
+ response = readpassphrase(challenge, rbuf, sizeof(rbuf), RPP_REQUIRE_TTY);
+ if (response == NULL && errno == ENOTTY) {
+ syslog(LOG_AUTHPRIV | LOG_NOTICE,
+ "tty required for %s", myname);
+ errx(1, "a tty is required");
+ }
+ if (!(encrypted = crypt(response, hash)))
+ errx(1, "crypt");
+ if (strcmp(encrypted, hash) != 0) {
+ syslog(LOG_AUTHPRIV | LOG_NOTICE, "failed auth for %s", myname);
+ errx(1, "Authorization failed");
+ }
+ explicit_bzero(rbuf, sizeof(rbuf));
+#ifdef PERSIST_TIMESTAMP
+good:
+ if (fd != -1) {
+ persist_set(fd, 5 * 60);
+ close(fd);
+ }
+#endif
+}
+#endif /* HAVE_BSD_AUTH_H */
+
int
-main(int argc, char **argv, char **envp)
+main(int argc, char **argv)
{
const char *safepath = "/bin:/sbin:/usr/bin:/usr/sbin:"
"/usr/local/bin:/usr/local/sbin";
char *shargv[] = { NULL, NULL };
char *sh;
const char *cmd;
- struct env *env;
char cmdline[LINE_MAX];
char myname[_PW_NAME_LEN + 1];
struct passwd *pw;
- struct rule *rule;
+ const struct rule *rule;
uid_t uid;
uid_t target = 0;
gid_t groups[NGROUPS_MAX + 1];
int vflag = 0;
char cwdpath[PATH_MAX];
const char *cwd;
-#ifdef HAVE_BSD_AUTH_H
+ char **envp;
char *login_style = NULL;
-#endif
setprogname("doas");
- if (pledge("stdio rpath getpw tty proc exec id", NULL) == -1)
- err(1, "pledge");
-
- /* closefrom(STDERR_FILENO + 1); */
+ closefrom(STDERR_FILENO + 1);
uid = getuid();
#ifdef HAVE_BSD_AUTH_H
-# define OPTSTRING "a:C:nsu:v"
+# define OPTSTRING "a:C:Lnsu:v"
#else
-# define OPTSTRING "C:nsu:v"
+# define OPTSTRING "+C:Lnsu:v"
#endif
while ((ch = getopt(argc, argv, OPTSTRING)) != -1) {
case 'C':
confpath = optarg;
break;
+ case 'L':
+#ifdef TIOCCLRVERAUTH
+ i = open("/dev/tty", O_RDWR);
+ if (i != -1)
+ ioctl(i, TIOCCLRVERAUTH);
+ exit(i == -1);
+#elif PERSIST_TIMESTAMP
+ exit(persist_clear() != 0);
+#endif
case 'u':
if (parseuid(optarg, &target) != 0)
errx(1, "unknown user");
if (sflag) {
sh = getenv("SHELL");
- if (sh == NULL || *sh == '\0')
- shargv[0] = pw->pw_shell;
- else
+ if (sh == NULL || *sh == '\0') {
+ shargv[0] = strdup(pw->pw_shell);
+ if (shargv[0] == NULL)
+ err(1, NULL);
+ } else
shargv[0] = sh;
argv = shargv;
argc = 1;
exit(1); /* fail safe */
}
+ if (geteuid())
+ errx(1, "not installed setuid");
+
parseconfig("/etc/doas.conf", 1);
/* cmdline is used only for logging, no need to abort on truncate */
- (void) strlcpy(cmdline, argv[0], sizeof(cmdline));
+ (void)strlcpy(cmdline, argv[0], sizeof(cmdline));
for (i = 1; i < argc; i++) {
if (strlcat(cmdline, " ", sizeof(cmdline)) >= sizeof(cmdline))
break;
cmd = argv[0];
if (!permit(uid, groups, ngroups, &rule, target, cmd,
- (const char**)argv + 1)) {
+ (const char **)argv + 1)) {
syslog(LOG_AUTHPRIV | LOG_NOTICE,
"failed command for %s: %s", myname, cmdline);
errc(1, EPERM, NULL);
}
- pw = getpwuid(target);
- if (!pw)
- errx(1, "no passwd entry for target");
-
-#ifdef HAVE_BSD_AUTH_H
+#if defined(HAVE_BSD_AUTH_H) || defined(HAVE_SHADOW_H)
if (!(rule->options & NOPASS)) {
if (nflag)
errx(1, "Authorization required");
- char *challenge = NULL, *response, rbuf[1024], cbuf[128];
- auth_session_t *as;
-
- if (!(as = auth_userchallenge(myname, login_style, "auth-doas",
- &challenge)))
- errx(1, "Authorization failed");
- if (!challenge) {
- char host[HOST_NAME_MAX + 1];
- if (gethostname(host, sizeof(host)))
- snprintf(host, sizeof(host), "?");
- snprintf(cbuf, sizeof(cbuf),
- "\rdoas (%.32s@%.32s) password: ", myname, host);
- challenge = cbuf;
- }
- response = readpassphrase(challenge, rbuf, sizeof(rbuf),
- RPP_REQUIRE_TTY);
- if (response == NULL && errno == ENOTTY) {
- syslog(LOG_AUTHPRIV | LOG_NOTICE,
- "tty required for %s", myname);
- errx(1, "a tty is required");
- }
- if (!auth_userresponse(as, response, 0)) {
- syslog(LOG_AUTHPRIV | LOG_NOTICE,
- "failed auth for %s", myname);
- errc(1, EPERM, NULL);
- }
- explicit_bzero(rbuf, sizeof(rbuf));
+ authuser(myname, login_style, rule->options & PERSIST);
}
#elif HAVE_PAM_APPL_H
- if (!doas_pam(pw->pw_name, myname, !nflag, rule->options & NOPASS)) {
+ pw = getpwuid(target);
+ if (!pw)
+ errx(1, "no passwd entry for target");
+
+ if (!pamauth(pw->pw_name, myname, !nflag, rule->options & NOPASS)) {
syslog(LOG_AUTHPRIV | LOG_NOTICE, "failed auth for %s", myname);
- errc(1, EPERM, NULL);
+ errx(1, "Authorization failed");
}
#else
- if (!(rule->options & NOPASS)) {
- errx(1, "Authorization required");
+#error "No authentication method"
#endif /* HAVE_BSD_AUTH_H */
if (pledge("stdio rpath getpw exec id", NULL) == -1)
err(1, "pledge");
+ pw = getpwuid(target);
+ if (!pw)
+ errx(1, "no passwd entry for target");
+
#ifdef HAVE_BSD_AUTH_H
if (setusercontext(NULL, pw, target, LOGIN_SETGROUP |
LOGIN_SETPRIORITY | LOGIN_SETRESOURCES | LOGIN_SETUMASK |
errx(1, "failed to set user context for target");
#else
if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) != 0)
- errx(1, "setgid");
+ errx(1, "setresgid");
if (initgroups(pw->pw_name, pw->pw_gid) != 0)
errx(1, "initgroups");
if (setresuid(target, target, target) != 0)
- errx(1, "setuid");
+ errx(1, "setresuid");
#endif
if (pledge("stdio rpath exec", NULL) == -1)
syslog(LOG_AUTHPRIV | LOG_INFO, "%s ran command %s as %s from %s",
myname, cmdline, pw->pw_name, cwd);
- env = createenv(envp);
- env = filterenv(env, rule);
- envp = flattenenv(env);
+ envp = prepenv(rule);
if (rule->cmd) {
if (setenv("PATH", safepath, 1) == -1)
projects / opendoas.git / blobdiff