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upstream commit
support arguments to AuthorizedKeysCommand bz#2081 loosely based on patch by Sami Hartikainen feedback and ok markus@ Upstream-ID: b080387a14aa67dddd8ece67c00f268d626541f7
This commit is contained in:
djm@openbsd.org
Damien Miller
parent
d80fbe41a5
commit
24232a3e5a
470
auth2-pubkey.c
470
auth2-pubkey.c
@ -1,4 +1,4 @@
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/* $OpenBSD: auth2-pubkey.c,v 1.49 2015/05/04 06:10:48 djm Exp $ */
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/* $OpenBSD: auth2-pubkey.c,v 1.50 2015/05/21 06:38:35 djm Exp $ */
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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@ -65,6 +65,9 @@
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#include "monitor_wrap.h"
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#include "authfile.h"
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#include "match.h"
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#include "ssherr.h"
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#include "channels.h" /* XXX for session.h */
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#include "session.h" /* XXX for child_set_env(); refactor? */
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/* import */
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extern ServerOptions options;
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@ -248,6 +251,288 @@ pubkey_auth_info(Authctxt *authctxt, const Key *key, const char *fmt, ...)
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free(extra);
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}
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/*
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* Splits 's' into an argument vector. Handles quoted string and basic
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* escape characters (\\, \", \'). Caller must free the argument vector
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* and its members.
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*/
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static int
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split_argv(const char *s, int *argcp, char ***argvp)
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{
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int r = SSH_ERR_INTERNAL_ERROR;
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int argc = 0, quote, i, j;
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char *arg, **argv = xcalloc(1, sizeof(*argv));
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*argvp = NULL;
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*argcp = 0;
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for (i = 0; s[i] != '\0'; i++) {
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/* Skip leading whitespace */
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if (s[i] == ' ' || s[i] == '\t')
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continue;
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/* Start of a token */
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quote = 0;
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if (s[i] == '\\' &&
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(s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\'))
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i++;
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else if (s[i] == '\'' || s[i] == '"')
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quote = s[i++];
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argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
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arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
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argv[argc] = NULL;
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/* Copy the token in, removing escapes */
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for (j = 0; s[i] != '\0'; i++) {
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if (s[i] == '\\') {
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if (s[i + 1] == '\'' ||
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s[i + 1] == '\"' ||
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s[i + 1] == '\\') {
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i++; /* Skip '\' */
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arg[j++] = s[i];
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} else {
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/* Unrecognised escape */
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arg[j++] = s[i];
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}
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} else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
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break; /* done */
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else if (quote != 0 && s[i] == quote)
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break; /* done */
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else
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arg[j++] = s[i];
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}
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if (s[i] == '\0') {
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if (quote != 0) {
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/* Ran out of string looking for close quote */
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r = SSH_ERR_INVALID_FORMAT;
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goto out;
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}
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break;
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}
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}
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/* Success */
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*argcp = argc;
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*argvp = argv;
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argc = 0;
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argv = NULL;
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r = 0;
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out:
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if (argc != 0 && argv != NULL) {
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for (i = 0; i < argc; i++)
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free(argv[i]);
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free(argv);
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}
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return r;
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}
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/*
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* Reassemble an argument vector into a string, quoting and escaping as
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* necessary. Caller must free returned string.
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*/
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static char *
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assemble_argv(int argc, char **argv)
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{
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int i, j, ws, r;
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char c, *ret;
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struct sshbuf *buf, *arg;
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if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
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fatal("%s: sshbuf_new failed", __func__);
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for (i = 0; i < argc; i++) {
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ws = 0;
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sshbuf_reset(arg);
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for (j = 0; argv[i][j] != '\0'; j++) {
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r = 0;
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c = argv[i][j];
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switch (c) {
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case ' ':
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case '\t':
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ws = 1;
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r = sshbuf_put_u8(arg, c);
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break;
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case '\\':
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case '\'':
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case '"':
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if ((r = sshbuf_put_u8(arg, '\\')) != 0)
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break;
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/* FALLTHROUGH */
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default:
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r = sshbuf_put_u8(arg, c);
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break;
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}
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if (r != 0)
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fatal("%s: sshbuf_put_u8: %s",
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__func__, ssh_err(r));
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}
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if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
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(ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
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(r = sshbuf_putb(buf, arg)) != 0 ||
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(ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
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fatal("%s: buffer error: %s", __func__, ssh_err(r));
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}
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if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
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fatal("%s: malloc failed", __func__);
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memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
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ret[sshbuf_len(buf)] = '\0';
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sshbuf_free(buf);
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sshbuf_free(arg);
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return ret;
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}
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/*
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* Runs command in a subprocess. Returns pid on success and a FILE* to the
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* subprocess' stdout or 0 on failure.
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* NB. "command" is only used for logging.
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*/
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static pid_t
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subprocess(const char *tag, struct passwd *pw, const char *command,
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int ac, char **av, FILE **child)
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{
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FILE *f;
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struct stat st;
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int devnull, p[2], i;
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pid_t pid;
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char *cp, errmsg[512];
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u_int envsize;
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char **child_env;
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*child = NULL;
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debug3("%s: %s command \"%s\" running as %s", __func__,
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tag, command, pw->pw_name);
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/* Verify the path exists and is safe-ish to execute */
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if (*av[0] != '/') {
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error("%s path is not absolute", tag);
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return 0;
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}
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temporarily_use_uid(pw);
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if (stat(av[0], &st) < 0) {
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error("Could not stat %s \"%s\": %s", tag,
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av[0], strerror(errno));
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restore_uid();
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return 0;
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}
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if (auth_secure_path(av[0], &st, NULL, 0,
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errmsg, sizeof(errmsg)) != 0) {
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error("Unsafe %s \"%s\": %s", tag, av[0], errmsg);
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restore_uid();
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return 0;
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}
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/*
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* Run the command; stderr is left in place, stdout is the
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* authorized_keys output.
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*/
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if (pipe(p) != 0) {
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error("%s: pipe: %s", tag, strerror(errno));
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restore_uid();
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return 0;
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}
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/*
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* Don't want to call this in the child, where it can fatal() and
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* run cleanup_exit() code.
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*/
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restore_uid();
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switch ((pid = fork())) {
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case -1: /* error */
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error("%s: fork: %s", tag, strerror(errno));
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close(p[0]);
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close(p[1]);
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return 0;
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case 0: /* child */
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/* Prepare a minimal environment for the child. */
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envsize = 5;
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child_env = xcalloc(sizeof(*child_env), envsize);
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child_set_env(&child_env, &envsize, "PATH", _PATH_STDPATH);
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child_set_env(&child_env, &envsize, "USER", pw->pw_name);
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child_set_env(&child_env, &envsize, "LOGNAME", pw->pw_name);
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child_set_env(&child_env, &envsize, "HOME", pw->pw_dir);
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if ((cp = getenv("LANG")) != NULL)
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child_set_env(&child_env, &envsize, "LANG", cp);
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for (i = 0; i < NSIG; i++)
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signal(i, SIG_DFL);
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if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
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error("%s: open %s: %s", tag, _PATH_DEVNULL,
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strerror(errno));
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_exit(1);
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}
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/* Keep stderr around a while longer to catch errors */
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if (dup2(devnull, STDIN_FILENO) == -1 ||
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dup2(p[1], STDOUT_FILENO) == -1) {
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error("%s: dup2: %s", tag, strerror(errno));
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_exit(1);
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}
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closefrom(STDERR_FILENO + 1);
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/* Don't use permanently_set_uid() here to avoid fatal() */
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if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) != 0) {
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error("%s: setresgid %u: %s", tag, (u_int)pw->pw_gid,
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strerror(errno));
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_exit(1);
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}
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if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) != 0) {
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error("%s: setresuid %u: %s", tag, (u_int)pw->pw_uid,
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strerror(errno));
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_exit(1);
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}
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/* stdin is pointed to /dev/null at this point */
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if (dup2(STDIN_FILENO, STDERR_FILENO) == -1) {
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error("%s: dup2: %s", tag, strerror(errno));
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_exit(1);
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}
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execve(av[0], av, child_env);
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error("%s exec \"%s\": %s", tag, command, strerror(errno));
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_exit(127);
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default: /* parent */
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break;
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}
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close(p[1]);
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if ((f = fdopen(p[0], "r")) == NULL) {
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error("%s: fdopen: %s", tag, strerror(errno));
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close(p[0]);
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/* Don't leave zombie child */
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kill(pid, SIGTERM);
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while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
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;
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return 0;
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}
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/* Success */
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debug3("%s: %s pid %ld", __func__, tag, (long)pid);
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*child = f;
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return pid;
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}
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/* Returns 0 if pid exited cleanly, non-zero otherwise */
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static int
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exited_cleanly(pid_t pid, const char *tag, const char *cmd)
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{
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int status;
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while (waitpid(pid, &status, 0) == -1) {
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if (errno != EINTR) {
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error("%s: waitpid: %s", tag, strerror(errno));
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return -1;
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}
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}
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if (WIFSIGNALED(status)) {
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error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
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return -1;
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} else if (WEXITSTATUS(status) != 0) {
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error("%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
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return -1;
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}
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return 0;
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}
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static int
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match_principals_option(const char *principal_list, struct sshkey_cert *cert)
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{
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@ -526,144 +811,117 @@ user_key_allowed2(struct passwd *pw, Key *key, char *file)
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static int
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user_key_command_allowed2(struct passwd *user_pw, Key *key)
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{
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FILE *f;
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int ok, found_key = 0;
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FILE *f = NULL;
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int r, ok, found_key = 0;
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struct passwd *pw;
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struct stat st;
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int status, devnull, p[2], i;
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int i, uid_swapped = 0, ac = 0;
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pid_t pid;
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char *username, errmsg[512];
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char *username = NULL, *key_fp = NULL, *keytext = NULL;
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char *tmp, *command = NULL, **av = NULL;
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void (*osigchld)(int);
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if (options.authorized_keys_command == NULL ||
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options.authorized_keys_command[0] != '/')
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if (options.authorized_keys_command == NULL)
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return 0;
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if (options.authorized_keys_command_user == NULL) {
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error("No user for AuthorizedKeysCommand specified, skipping");
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return 0;
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}
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/*
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* NB. all returns later this function should go via "out" to
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* ensure the original SIGCHLD handler is restored properly.
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*/
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osigchld = signal(SIGCHLD, SIG_DFL);
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/* Prepare and verify the user for the command */
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username = percent_expand(options.authorized_keys_command_user,
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"u", user_pw->pw_name, (char *)NULL);
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pw = getpwnam(username);
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if (pw == NULL) {
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error("AuthorizedKeysCommandUser \"%s\" not found: %s",
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username, strerror(errno));
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free(username);
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return 0;
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}
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free(username);
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temporarily_use_uid(pw);
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if (stat(options.authorized_keys_command, &st) < 0) {
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error("Could not stat AuthorizedKeysCommand \"%s\": %s",
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options.authorized_keys_command, strerror(errno));
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goto out;
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}
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if (auth_secure_path(options.authorized_keys_command, &st, NULL, 0,
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errmsg, sizeof(errmsg)) != 0) {
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error("Unsafe AuthorizedKeysCommand: %s", errmsg);
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goto out;
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}
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if (pipe(p) != 0) {
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error("%s: pipe: %s", __func__, strerror(errno));
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/* Prepare AuthorizedKeysCommand */
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if ((key_fp = sshkey_fingerprint(key, options.fingerprint_hash,
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SSH_FP_DEFAULT)) == NULL) {
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error("%s: sshkey_fingerprint failed", __func__);
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goto out;
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}
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if ((r = sshkey_to_base64(key, &keytext)) != 0) {
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error("%s: sshkey_to_base64 failed: %s", __func__, ssh_err(r));
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goto out;
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}
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debug3("Running AuthorizedKeysCommand: \"%s %s\" as \"%s\"",
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options.authorized_keys_command, user_pw->pw_name, pw->pw_name);
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/* Turn the command into an argument vector */
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if (split_argv(options.authorized_keys_command, &ac, &av) != 0) {
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error("AuthorizedKeysCommand \"%s\" contains invalid quotes",
|
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command);
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goto out;
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}
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if (ac == 0) {
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error("AuthorizedKeysCommand \"%s\" yielded no arguments",
|
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command);
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goto out;
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}
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for (i = 1; i < ac; i++) {
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tmp = percent_expand(av[i],
|
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"u", user_pw->pw_name,
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"h", user_pw->pw_dir,
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"t", sshkey_ssh_name(key),
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"f", key_fp,
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"k", keytext,
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(char *)NULL);
|
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if (tmp == NULL)
|
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fatal("%s: percent_expand failed", __func__);
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free(av[i]);
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av[i] = tmp;
|
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}
|
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/* Prepare a printable command for logs, etc. */
|
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command = assemble_argv(ac, av);
|
||||
|
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/*
|
||||
* Don't want to call this in the child, where it can fatal() and
|
||||
* run cleanup_exit() code.
|
||||
* If AuthorizedKeysCommand was run without arguments
|
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* then fall back to the old behaviour of passing the
|
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* target username as a single argument.
|
||||
*/
|
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restore_uid();
|
||||
|
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switch ((pid = fork())) {
|
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case -1: /* error */
|
||||
error("%s: fork: %s", __func__, strerror(errno));
|
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close(p[0]);
|
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close(p[1]);
|
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return 0;
|
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case 0: /* child */
|
||||
for (i = 0; i < NSIG; i++)
|
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signal(i, SIG_DFL);
|
||||
|
||||
if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
|
||||
error("%s: open %s: %s", __func__, _PATH_DEVNULL,
|
||||
strerror(errno));
|
||||
_exit(1);
|
||||
}
|
||||
/* Keep stderr around a while longer to catch errors */
|
||||
if (dup2(devnull, STDIN_FILENO) == -1 ||
|
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dup2(p[1], STDOUT_FILENO) == -1) {
|
||||
error("%s: dup2: %s", __func__, strerror(errno));
|
||||
_exit(1);
|
||||
}
|
||||
closefrom(STDERR_FILENO + 1);
|
||||
|
||||
/* Don't use permanently_set_uid() here to avoid fatal() */
|
||||
if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) != 0) {
|
||||
error("setresgid %u: %s", (u_int)pw->pw_gid,
|
||||
strerror(errno));
|
||||
_exit(1);
|
||||
}
|
||||
if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) != 0) {
|
||||
error("setresuid %u: %s", (u_int)pw->pw_uid,
|
||||
strerror(errno));
|
||||
_exit(1);
|
||||
}
|
||||
/* stdin is pointed to /dev/null at this point */
|
||||
if (dup2(STDIN_FILENO, STDERR_FILENO) == -1) {
|
||||
error("%s: dup2: %s", __func__, strerror(errno));
|
||||
_exit(1);
|
||||
}
|
||||
|
||||
execl(options.authorized_keys_command,
|
||||
options.authorized_keys_command, user_pw->pw_name, NULL);
|
||||
|
||||
error("AuthorizedKeysCommand %s exec failed: %s",
|
||||
options.authorized_keys_command, strerror(errno));
|
||||
_exit(127);
|
||||
default: /* parent */
|
||||
break;
|
||||
if (ac == 1) {
|
||||
av = xreallocarray(av, ac + 2, sizeof(*av));
|
||||
av[1] = xstrdup(user_pw->pw_name);
|
||||
av[2] = NULL;
|
||||
/* Fix up command too, since it is used in log messages */
|
||||
free(command);
|
||||
xasprintf(&command, "%s %s", av[0], av[1]);
|
||||
}
|
||||
|
||||
if ((pid = subprocess("AuthorizedKeysCommand", pw, command,
|
||||
ac, av, &f)) == 0)
|
||||
goto out;
|
||||
|
||||
uid_swapped = 1;
|
||||
temporarily_use_uid(pw);
|
||||
|
||||
close(p[1]);
|
||||
if ((f = fdopen(p[0], "r")) == NULL) {
|
||||
error("%s: fdopen: %s", __func__, strerror(errno));
|
||||
close(p[0]);
|
||||
/* Don't leave zombie child */
|
||||
kill(pid, SIGTERM);
|
||||
while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
|
||||
;
|
||||
goto out;
|
||||
}
|
||||
ok = check_authkeys_file(f, options.authorized_keys_command, key, pw);
|
||||
fclose(f);
|
||||
|
||||
while (waitpid(pid, &status, 0) == -1) {
|
||||
if (errno != EINTR) {
|
||||
error("%s: waitpid: %s", __func__, strerror(errno));
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
if (WIFSIGNALED(status)) {
|
||||
error("AuthorizedKeysCommand %s exited on signal %d",
|
||||
options.authorized_keys_command, WTERMSIG(status));
|
||||
if (exited_cleanly(pid, "AuthorizedKeysCommand", command) != 0)
|
||||
goto out;
|
||||
} else if (WEXITSTATUS(status) != 0) {
|
||||
error("AuthorizedKeysCommand %s returned status %d",
|
||||
options.authorized_keys_command, WEXITSTATUS(status));
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* Read completed successfully */
|
||||
found_key = ok;
|
||||
out:
|
||||
restore_uid();
|
||||
if (f != NULL)
|
||||
fclose(f);
|
||||
signal(SIGCHLD, osigchld);
|
||||
for (i = 0; i < ac; i++)
|
||||
free(av[i]);
|
||||
free(av);
|
||||
if (uid_swapped)
|
||||
restore_uid();
|
||||
free(command);
|
||||
free(username);
|
||||
free(key_fp);
|
||||
free(keytext);
|
||||
return found_key;
|
||||
}
|
||||
|
||||
|
||||
@ -33,8 +33,8 @@
|
||||
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
||||
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
.\"
|
||||
.\" $OpenBSD: sshd_config.5,v 1.200 2015/04/29 03:48:56 dtucker Exp $
|
||||
.Dd $Mdocdate: April 29 2015 $
|
||||
.\" $OpenBSD: sshd_config.5,v 1.201 2015/05/21 06:38:35 djm Exp $
|
||||
.Dd $Mdocdate: May 21 2015 $
|
||||
.Dt SSHD_CONFIG 5
|
||||
.Os
|
||||
.Sh NAME
|
||||
@ -234,9 +234,21 @@ The default is not to require multiple authentication; successful completion
|
||||
of a single authentication method is sufficient.
|
||||
.It Cm AuthorizedKeysCommand
|
||||
Specifies a program to be used to look up the user's public keys.
|
||||
The program must be owned by root and not writable by group or others.
|
||||
It will be invoked with a single argument of the username
|
||||
being authenticated, and should produce on standard output zero or
|
||||
The program must be owned by root, not writable by group or others and
|
||||
specified by an absolute path.
|
||||
.Pp
|
||||
Arguments to
|
||||
.Cm AuthorizedKeysCommand
|
||||
may be provided using the following tokens, which will be expanded
|
||||
at runtime: %% is replaced by a literal '%', %u is replaced by the
|
||||
username being authenticated, %h is replaced by the home directory
|
||||
of the user being authenticated, %t is replaced with the key type
|
||||
offered for authentication, %f is replaced with the fingerprint of
|
||||
the key, and %k is replaced with the key being offered for authentication.
|
||||
If no arguments are specified then the username of the target user
|
||||
will be supplied.
|
||||
.Pp
|
||||
The program should produce on standard output zero or
|
||||
more lines of authorized_keys output (see AUTHORIZED_KEYS in
|
||||
.Xr sshd 8 ) .
|
||||
If a key supplied by AuthorizedKeysCommand does not successfully authenticate
|
||||
|
||||
Loading…
Reference in New Issue
Block a user