-/* $OpenBSD: doas.c,v 1.52 2016/04/28 04:48:56 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 "includes.h"
#include "doas.h"
-#include "version.h"
static void __dead
version(void)
return envp;
}
+/* find index of 'name' in environment envp */
+static int
+findenv(const char **envp, const char *name, size_t namelen)
+{
+ 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
checkconfig(const char *confpath, int argc, char **argv,
uid_t uid, gid_t *groups, int ngroups, uid_t target)
{
struct rule *rule;
- setresuid(uid, uid, uid);
+ if (setresuid(uid, uid, uid) != 0)
+ err(1, "setresuid");
+
parseconfig(confpath, 0);
if (!argc)
exit(0);
errc(1, EPERM, NULL);
}
+#ifdef HAVE_BSD_AUTH_H
if (!(rule->options & NOPASS)) {
if (nflag)
errx(1, "Authorization required");
-#ifdef HAVE_BSD_AUTH_H
char *challenge = NULL, *response, rbuf[1024], cbuf[128];
auth_session_t *as;
errc(1, EPERM, NULL);
}
explicit_bzero(rbuf, sizeof(rbuf));
+ }
+#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 (!auth_userokay(myname, NULL, NULL, NULL)) {
- syslog(LOG_AUTHPRIV | LOG_NOTICE,
- "failed auth for %s", myname);
- errc(1, EPERM, NULL);
- }
+ 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");
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);