1 files changed, 140 insertions, 0 deletions
diff --git a/debian/patches/CVE-2023-38408-3.patch b/debian/patches/CVE-2023-38408-3.patch
new file mode 100644
index 0000000..acbdf84
--- /dev/null
+++ b/debian/patches/CVE-2023-38408-3.patch
@@ -0,0 +1,140 @@
+Backport of:
+
+From 29ef8a04866ca14688d5b7fed7b8b9deab851f77 Mon Sep 17 00:00:00 2001
+From: "djm@openbsd.org" <djm@openbsd.org>
+Date: Wed, 19 Jul 2023 14:02:27 +0000
+Subject: [PATCH] upstream: Ensure FIDO/PKCS11 libraries contain expected
+ symbols
+
+This checks via nlist(3) that candidate provider libraries contain one
+of the symbols that we will require prior to dlopen(), which can cause
+a number of side effects, including execution of constructors.
+
+Feedback deraadt; ok markus
+
+OpenBSD-Commit-ID: 1508a5fbd74e329e69a55b56c453c292029aefbe
+---
+ misc.c       | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++-
+ misc.h       |  3 +-
+ ssh-pkcs11.c |  6 +++-
+ 3 files changed, 83 insertions(+), 4 deletions(-)
+
+--- a/misc.c
++++ b/misc.c
+@@ -28,6 +28,7 @@
+ 
+ #include <sys/types.h>
+ #include <sys/ioctl.h>
++#include <sys/mman.h>
+ #include <sys/socket.h>
+ #include <sys/stat.h>
+ #include <sys/time.h>
+@@ -38,6 +39,9 @@
+ #ifdef HAVE_LIBGEN_H
+ # include <libgen.h>
+ #endif
++#ifdef HAVE_NLIST_H
++#include <nlist.h>
++#endif
+ #include <signal.h>
+ #include <stdarg.h>
+ #include <stdio.h>
+@@ -2085,3 +2089,75 @@
+ 	localtime_r(&tt, &tm);
+ 	strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm);
+ }
++
++/*
++ * Returns zero if the library at 'path' contains symbol 's', nonzero
++ * otherwise.
++ */
++int
++lib_contains_symbol(const char *path, const char *s)
++{
++#ifdef HAVE_NLIST_H
++	struct nlist nl[2];
++	int ret = -1, r;
++
++	memset(nl, 0, sizeof(nl));
++	nl[0].n_name = xstrdup(s);
++	nl[1].n_name = NULL;
++	if ((r = nlist(path, nl)) == -1) {
++		error("nlist failed for %s", path);
++		goto out;
++	}
++	if (r != 0 || nl[0].n_value == 0 || nl[0].n_type == 0) {
++		error("library %s does not contain symbol %s", path, s);
++		goto out;
++	}
++	/* success */
++	ret = 0;
++ out:
++	free(nl[0].n_name);
++	return ret;
++#else /* HAVE_NLIST_H */
++	int fd, ret = -1;
++	struct stat st;
++	void *m = NULL;
++	size_t sz = 0;
++
++	memset(&st, 0, sizeof(st));
++	if ((fd = open(path, O_RDONLY)) < 0) {
++		error("open %s: %s", path, strerror(errno));
++		return -1;
++	}
++	if (fstat(fd, &st) != 0) {
++		error("fstat %s: %s", path, strerror(errno));
++		goto out;
++	}
++	if (!S_ISREG(st.st_mode)) {
++		error("%s is not a regular file", path);
++		goto out;
++	}
++	if (st.st_size < 0 ||
++	    (size_t)st.st_size < strlen(s) ||
++	    st.st_size >= INT_MAX/2) {
++		error("%s bad size %lld", path, (long long)st.st_size);
++		goto out;
++	}
++	sz = (size_t)st.st_size;
++	if ((m = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, fd, 0)) == MAP_FAILED ||
++	    m == NULL) {
++		error("mmap %s: %s", path, strerror(errno));
++		goto out;
++	}
++	if (memmem(m, sz, s, strlen(s)) == NULL) {
++		error("%s does not contain expected string %s", path, s);
++		goto out;
++	}
++	/* success */
++	ret = 0;
++ out:
++	if (m != NULL && m != MAP_FAILED)
++		munmap(m, sz);
++	close(fd);
++	return ret;
++#endif /* HAVE_NLIST_H */
++}
+--- a/misc.h
++++ b/misc.h
+@@ -78,6 +78,7 @@
+ const char *atoi_err(const char *, int *);
+ int	 parse_absolute_time(const char *, uint64_t *);
+ void	 format_absolute_time(uint64_t, char *, size_t);
++int	 lib_contains_symbol(const char *, const char *);
+ 
+ void	 sock_set_v6only(int);
+ 
+--- a/ssh-pkcs11.c
++++ b/ssh-pkcs11.c
+@@ -607,6 +607,10 @@
+ 		    __func__, provider_id);
+ 		goto fail;
+ 	}
++	if (lib_contains_symbol(provider_id, "C_GetFunctionList") != 0) {
++		error("provider %s is not a PKCS11 library", provider_id);
++		goto fail;
++	}
+ 	/* open shared pkcs11-libarary */
+ 	if ((handle = dlopen(provider_id, RTLD_NOW)) == NULL) {
+ 		error("dlopen %s failed: %s", provider_id, dlerror());