-/* $OpenBSD: doas.c,v 1.33 2015/07/30 17:04:33 tedu Exp $ */
+/* $OpenBSD: doas.c,v 1.53 2016/06/05 00:46:34 djm Exp $ */
/*
* Copyright (c) 2015 Ted Unangst <tedu@openbsd.org>
*
#include <syslog.h>
#include <errno.h>
-#include "openbsd.h"
+#include "includes.h"
#include "doas.h"
-#include "version.h"
static void __dead
version(void)
static void __dead
usage(void)
{
- fprintf(stderr, "usage: doas [-nsv] [-C config] [-u user] command [args]\n");
+ fprintf(stderr, "usage: doas [-nsv] [-a style] [-C config] [-u user]"
+ " command [args]\n");
exit(1);
}
struct stat sb;
yyfp = fopen(filename, "r");
- if (!yyfp) {
- warn("could not open config file");
- exit(1);
- }
+ if (!yyfp)
+ err(1, checkperms ? "doas is not enabled, %s" :
+ "could not open config file %s", filename);
if (checkperms) {
if (fstat(fileno(yyfp), &sb) != 0)
return envp;
}
-static void __dead
-fail(void)
+/* find index of 'name' in environment envp */
+static int
+findenv(const char **envp, const char *name, size_t namelen)
{
- fprintf(stderr, "Permission denied\n");
- exit(1);
+ int i;
+
+ for (i = 0 ; envp[i] != NULL; i++) {
+ if (strlen(envp[i]) < namelen + 1)
+ continue;
+ if (strncmp(envp[i], name, namelen) == 0 &&
+ envp[i][namelen] == '=')
+ return i;
+ }
+ return -1;
+}
+
+/* merge rule->setenvlist into environment list; frees oldenvp */
+static char **
+dosetenv(char **oldenvp, struct rule *rule)
+{
+ size_t n, i, nset, nold;
+ char **envp, *cp, *cp2;
+ int found;
+
+ if (!(rule->options & SETENV))
+ return oldenvp;
+
+ nset = arraylen(rule->setenvlist);
+ nold = arraylen((const char**)oldenvp);
+
+ /* insert new variables */
+ n = 0;
+ envp = NULL;
+ for (i = 0; i < nset; i++) {
+ if ((cp = strchr(rule->setenvlist[i], '=')) == NULL)
+ errx(1, "invalid setenv"); /* shouldn't happen */
+ if (cp[1] == '\0' || cp - rule->setenvlist[i] > INT_MAX)
+ continue; /* skip variables with empty values */
+ if ((envp = reallocarray(envp, n + 2, sizeof(*envp))) == NULL)
+ errx(1, "reallocarray failed");
+ if (cp[1] == '$') {
+ /* FOO=$BAR: lookup and copy */
+ if ((cp2 = getenv(cp + 2)) == NULL)
+ continue; /* not found; skip */
+ if (asprintf(&(envp[n++]), "%.*s=%s",
+ (int)(cp - rule->setenvlist[i]),
+ rule->setenvlist[i], cp2) == -1)
+ errx(1, "asprintf failed");
+ continue;
+ } else {
+ /* plain setenv */
+ if ((envp[n++] = strdup(rule->setenvlist[i])) == NULL)
+ errx(1, "strdup failed");
+ }
+ }
+ /* move old variables, dropping ones already set */
+ for (i = 0; i < nold; i++) {
+ if ((cp = strchr(oldenvp[i], '=')) == NULL)
+ errx(1, "invalid env"); /* shouldn't happen */
+ found = findenv(rule->setenvlist, oldenvp[i], cp - oldenvp[i]);
+ if (found != -1)
+ free(oldenvp[i]); /* discard */
+ else {
+ if ((envp = reallocarray(envp, n + 2,
+ sizeof(*envp))) == NULL)
+ errx(1, "reallocarray failed");
+ envp[n++] = oldenvp[i]; /* move */
+ }
+ }
+ free(oldenvp);
+ if (n > 0)
+ envp[n] = NULL;
+ return envp;
}
static void __dead
{
struct rule *rule;
- setresuid(uid, uid, uid);
+ if (setresuid(uid, uid, uid) != 0)
+ err(1, "setresuid");
+
parseconfig(confpath, 0);
if (!argc)
exit(0);
int sflag = 0;
int nflag = 0;
int vflag = 0;
+ char cwdpath[PATH_MAX];
+ const char *cwd;
+#ifdef HAVE_BSD_AUTH_H
+ 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); */
uid = getuid();
- while ((ch = getopt(argc, argv, "C:nsu:v")) != -1) {
+#ifdef HAVE_BSD_AUTH_H
+# define OPTSTRING "a:C:nsu:v"
+#else
+# define OPTSTRING "C:nsu:v"
+#endif
+
+ while ((ch = getopt(argc, argv, OPTSTRING)) != -1) {
switch (ch) {
+#ifdef HAVE_BSD_AUTH_H
+ case 'a':
+ login_style = optarg;
+ break;
+#endif
case 'C':
confpath = optarg;
break;
(const char**)argv + 1)) {
syslog(LOG_AUTHPRIV | LOG_NOTICE,
"failed command for %s: %s", myname, cmdline);
- fail();
+ errc(1, EPERM, NULL);
}
+#ifdef HAVE_BSD_AUTH_H
if (!(rule->options & NOPASS)) {
if (nflag)
errx(1, "Authorization required");
- if (!auth_userokay(myname, NULL, NULL, NULL)) {
+
+ 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 password for %s", myname);
- fail();
+ "failed auth for %s", myname);
+ errc(1, EPERM, NULL);
}
+ explicit_bzero(rbuf, sizeof(rbuf));
}
- envp = copyenv((const char **)envp, rule);
+#elif HAVE_PAM_APPL_H
+ if (!doas_pam(myname, !nflag, rule->options & NOPASS)) {
+ syslog(LOG_AUTHPRIV | LOG_NOTICE,
+ "failed auth for %s", myname);
+ errc(1, EPERM, NULL);
+ }
+#else
+ if (!(rule->options & NOPASS)) {
+ errx(1, "Authorization required");
+#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");
+
if (setusercontext(NULL, pw, target, LOGIN_SETGROUP |
LOGIN_SETPRIORITY | LOGIN_SETRESOURCES | LOGIN_SETUMASK |
LOGIN_SETUSER) != 0)
errx(1, "failed to set user context for target");
- syslog(LOG_AUTHPRIV | LOG_INFO, "%s ran command as %s: %s",
- myname, pw->pw_name, cmdline);
- if (setenv("PATH", safepath, 1) == -1)
- err(1, "failed to set PATH '%s'", safepath);
+ if (pledge("stdio rpath exec", NULL) == -1)
+ err(1, "pledge");
+
+ if (getcwd(cwdpath, sizeof(cwdpath)) == NULL)
+ cwd = "(failed)";
+ else
+ cwd = cwdpath;
+
+ if (pledge("stdio exec", NULL) == -1)
+ err(1, "pledge");
+
+ syslog(LOG_AUTHPRIV | LOG_INFO, "%s ran command %s as %s from %s",
+ myname, cmdline, pw->pw_name, cwd);
+
+ envp = copyenv((const char **)envp, rule);
+
+ envp = dosetenv(envp, rule);
+
+ if (rule->cmd) {
+ if (setenv("PATH", safepath, 1) == -1)
+ err(1, "failed to set PATH '%s'", safepath);
+ }
execvpe(cmd, argv, envp);
if (errno == ENOENT)
errx(1, "%s: command not found", cmd);
projects / opendoas.git / blobdiff