diff options
| -rw-r--r-- | ssh-sk-client.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/ssh-sk-client.c b/ssh-sk-client.c index 9121570d..359327b6 100644 --- a/ssh-sk-client.c +++ b/ssh-sk-client.c @@ -1,4 +1,4 @@ -/* $OpenBSD: ssh-sk-client.c,v 1.5 2020/01/10 23:43:26 djm Exp $ */ +/* $OpenBSD: ssh-sk-client.c,v 1.6 2020/01/21 07:07:31 djm Exp $ */ /* * Copyright (c) 2019 Google LLC * @@ -21,6 +21,7 @@ #include <sys/socket.h> #include <sys/wait.h> +#include <fcntl.h> #include <limits.h> #include <errno.h> #include <signal.h> @@ -56,6 +57,13 @@ start_helper(int *fdp, pid_t *pidp, void (**osigchldp)(int)) helper = getenv("SSH_SK_HELPER"); if (helper == NULL || strlen(helper) == 0) helper = _PATH_SSH_SK_HELPER; + if (access(helper, X_OK) != 0) { + oerrno = errno; + error("%s: helper \"%s\" unusable: %s", __func__, helper, + strerror(errno)); + errno = oerrno; + return SSH_ERR_SYSTEM_ERROR; + } #ifdef DEBUG_SK verbosity = "-vvv"; #endif |