-/* $OpenBSD: doas.c,v 1.18 2015/07/21 17:49:33 jmc Exp $ */
+/* $OpenBSD: doas.c,v 1.29 2015/07/28 14:08:52 zhuk Exp $ */
/*
* Copyright (c) 2015 Ted Unangst <tedu@openbsd.org>
*
static void __dead
usage(void)
{
- fprintf(stderr, "usage: doas [-s] [-C config] [-u user] command [args]\n");
+ fprintf(stderr, "usage: doas [-ns] [-C config] [-u user] command [args]\n");
exit(1);
}
}
static void
-parseconfig(const char *filename)
+parseconfig(const char *filename, int checkperms)
{
extern FILE *yyfp;
extern int yyparse(void);
yyfp = fopen(filename, "r");
if (!yyfp) {
- fprintf(stderr, "doas is not enabled.\n");
+ if (checkperms)
+ fprintf(stderr, "doas is not enabled.\n");
+ else
+ warn("could not open config file");
exit(1);
}
- if (fstat(fileno(yyfp), &sb) != 0)
- err(1, "fstat(\"%s\")", filename);
- if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0)
- errx(1, "%s is writable by group or other", filename);
- if (sb.st_uid != 0)
- errx(1, "%s is not owned by root", filename);
+ if (checkperms) {
+ if (fstat(fileno(yyfp), &sb) != 0)
+ err(1, "fstat(\"%s\")", filename);
+ if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0)
+ errx(1, "%s is writable by group or other", filename);
+ if (sb.st_uid != 0)
+ errx(1, "%s is not owned by root", filename);
+ }
yyparse();
fclose(yyfp);
+ if (parse_errors)
+ exit(1);
}
+/*
+ * Copy to envp environment variables from oldenvp which names are
+ * in safeset.
+ */
static int
copyenvhelper(const char **oldenvp, const char **safeset, int nsafe,
char **envp, int ei)
int ei;
int nsafe, nbad;
int nextras = 0;
-
+
+ /* if there was no envvar whitelist, pass all except badset ones */
nbad = arraylen(badset);
if ((rule->options & KEEPENV) && !rule->envlist) {
- size_t i, ii;
+ size_t iold, inew;
size_t oldlen = arraylen(oldenvp);
envp = reallocarray(NULL, oldlen + 1, sizeof(char *));
if (!envp)
err(1, "reallocarray");
- for (ii = i = 0; i < oldlen; i++) {
- size_t j;
- for (j = 0; j < nbad; j++) {
- size_t len = strlen(badset[j]);
- if (strncmp(oldenvp[i], badset[j], len) == 0 &&
- oldenvp[i][len] == '=') {
+ for (inew = iold = 0; iold < oldlen; iold++) {
+ size_t ibad;
+ for (ibad = 0; ibad < nbad; ibad++) {
+ size_t len = strlen(badset[ibad]);
+ if (strncmp(oldenvp[iold], badset[ibad], len) == 0 &&
+ oldenvp[iold][len] == '=') {
break;
}
}
- if (j == nbad) {
- if (!(envp[ii] = strdup(oldenvp[i])))
+ if (ibad == nbad) {
+ if (!(envp[inew] = strdup(oldenvp[iold])))
err(1, "strdup");
- ii++;
+ inew++;
}
}
- envp[ii] = NULL;
+ envp[inew] = NULL;
return envp;
}
nsafe = arraylen(safeset);
if ((extra = rule->envlist)) {
- size_t i;
+ size_t isafe;
nextras = arraylen(extra);
- for (i = 0; i < nsafe; i++) {
- size_t j;
- for (j = 0; j < nextras; j++) {
- if (strcmp(extra[j], safeset[i]) == 0) {
- extra[j--] = extra[nextras--];
+ for (isafe = 0; isafe < nsafe; isafe++) {
+ size_t iextras;
+ for (iextras = 0; iextras < nextras; iextras++) {
+ if (strcmp(extra[iextras], safeset[isafe]) == 0) {
+ nextras--;
+ extra[iextras] = extra[nextras];
extra[nextras] = NULL;
+ iextras--;
}
}
}
exit(1);
}
+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);
+ parseconfig(confpath, 0);
+ if (!argc)
+ exit(0);
+
+ if (permit(uid, groups, ngroups, &rule, target, argv[0],
+ (const char **)argv + 1)) {
+ printf("permit%s\n", (rule->options & NOPASS) ? " nopass" : "");
+ exit(0);
+ } else {
+ printf("deny\n");
+ exit(1);
+ }
+}
+
int
main(int argc, char **argv, char **envp)
{
const char *safepath = "/bin:/sbin:/usr/bin:/usr/sbin:"
"/usr/local/bin:/usr/local/sbin";
+ const char *confpath = NULL;
char *shargv[] = { NULL, NULL };
char *sh;
const char *cmd;
int ngroups;
int i, ch;
int sflag = 0;
+ int nflag = 0;
- while ((ch = getopt(argc, argv, "C:su:")) != -1) {
+ uid = getuid();
+ while ((ch = getopt(argc, argv, "C:nsu:")) != -1) {
switch (ch) {
case 'C':
- target = getuid();
- setresuid(target, target, target);
- parseconfig(optarg);
- exit(0);
+ confpath = optarg;
+ break;
case 'u':
if (parseuid(optarg, &target) != 0)
errx(1, "unknown user");
break;
+ case 'n':
+ nflag = 1;
+ break;
case 's':
sflag = 1;
break;
argv += optind;
argc -= optind;
- if ((!sflag && !argc) || (sflag && argc))
+ if (confpath) {
+ if (sflag)
+ usage();
+ } else if ((!sflag && !argc) || (sflag && argc))
usage();
- parseconfig("/etc/doas.conf");
-
uid = getuid();
pw = getpwuid(uid);
if (!pw)
argc = 1;
}
- cmd = argv[0];
- if (strlcpy(cmdline, argv[0], sizeof(cmdline)) >= sizeof(cmdline))
- errx(1, "command line too long");
+ if (confpath) {
+ checkconfig(confpath, argc, argv, uid, groups, ngroups,
+ target);
+ exit(1); /* fail safe */
+ }
+
+ parseconfig("/etc/doas.conf", 1);
+
+ /* cmdline is used only for logging, no need to abort on truncate */
+ (void) strlcpy(cmdline, argv[0], sizeof(cmdline));
for (i = 1; i < argc; i++) {
if (strlcat(cmdline, " ", sizeof(cmdline)) >= sizeof(cmdline))
- errx(1, "command line too long");
+ break;
if (strlcat(cmdline, argv[i], sizeof(cmdline)) >= sizeof(cmdline))
- errx(1, "command line too long");
+ break;
}
+ cmd = argv[0];
if (!permit(uid, groups, ngroups, &rule, target, cmd,
(const char**)argv + 1)) {
syslog(LOG_AUTHPRIV | LOG_NOTICE,
}
if (!(rule->options & NOPASS)) {
+ if (nflag)
+ errx(1, "Authorization required");
if (!auth_userokay(myname, NULL, NULL, NULL)) {
syslog(LOG_AUTHPRIV | LOG_NOTICE,
"failed password for %s", myname);
projects / opendoas.git / blobdiff