@@ -3,20 +3,20 @@ From: Alexey Abramov <levenson@mmer.org>
Date: Fri, 22 Apr 2022 11:32:15 +0200
Subject: [PATCH] Trust guix store directory
-To be able to execute binaries defined in OpenSSH configuration, we
-need to tell OpenSSH that we can trust Guix store objects. safe_path
-procedure takes a canonical path and for each component, walking
-upwards, checks ownership and permissions constrains which are: must
-be owned by root, not writable by group or others.
+To be able to execute binaries defined in OpenSSH configuration, we need to
+tell OpenSSH that we can trust Guix store objects. safe_path procedure is
+patched to assume files in Guix store to be safe. Additionally configuration
+file placed in Guix store is assumed to be safe to load.
---
- misc.c | 5 +++++
- 1 file changed, 5 insertions(+)
+ misc.c | 6 ++++++
+ readconf.c | 7 ++++---
+ 2 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/misc.c b/misc.c
-index 0134d69..7131d5e 100644
+index dd0bd032a..6b866464c 100644
--- a/misc.c
+++ b/misc.c
-@@ -2146,6 +2146,7 @@ int
+@@ -2254,6 +2254,7 @@ int
safe_path(const char *name, struct stat *stp, const char *pw_dir,
uid_t uid, char *err, size_t errlen)
{
@@ -24,17 +24,42 @@ index 0134d69..7131d5e 100644
char buf[PATH_MAX], homedir[PATH_MAX];
char *cp;
int comparehome = 0;
-@@ -2178,6 +2179,10 @@ safe_path(const char *name, struct stat *stp, const char *pw_dir,
- }
- strlcpy(buf, cp, sizeof(buf));
-
-+ /* If we are past the Guix store then we can stop */
-+ if (strcmp(guix_store, buf) == 0)
-+ break;
+@@ -2271,6 +2272,11 @@ safe_path(const char *name, struct stat *stp, const char *pw_dir,
+ snprintf(err, errlen, "%s is not a regular file", buf);
+ return -1;
+ }
++ // the file is trusted when it is located in guix store
++ if (strncmp(buf, guix_store, strlen(guix_store)) == 0) {
++ return 0;
++ }
+
- if (stat(buf, &st) == -1 ||
- (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) ||
- (st.st_mode & 022) != 0) {
+ if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) ||
+ (stp->st_mode & 022) != 0) {
+ snprintf(err, errlen, "bad ownership or modes for file %s",
+diff --git a/readconf.c b/readconf.c
+index 7cbe7d2c2..40a5f1ace 100644
+--- a/readconf.c
++++ b/readconf.c
+@@ -2566,6 +2566,7 @@ read_config_file_depth(const char *filename, struct passwd *pw,
+ {
+ FILE *f;
+ char *line = NULL;
++ char errmsg[512];
+ size_t linesize = 0;
+ int linenum;
+ int bad_options = 0;
+@@ -2581,9 +2582,9 @@ read_config_file_depth(const char *filename, struct passwd *pw,
+
+ if (fstat(fileno(f), &sb) == -1)
+ fatal("fstat %s: %s", filename, strerror(errno));
+- if (((sb.st_uid != 0 && sb.st_uid != getuid()) ||
+- (sb.st_mode & 022) != 0))
+- fatal("Bad owner or permissions on %s", filename);
++ if (safe_path(filename, &sb, pw->pw_dir, pw->pw_uid, errmsg, sizeof(errmsg)) != 0) {
++ fatal(errmsg);
++ }
+ }
+
+ debug("Reading configuration data %.200s", filename);
--
-2.34.0
-
+2.49.0
@@ -262,7 +262,7 @@ (define-public openssh
(lambda _
(substitute* "misc.c"
(("@STORE_DIRECTORY@")
- (string-append "\"" (%store-directory) "\"")))))
+ (string-append "\"" (%store-directory) "/\"")))))
(add-before 'check 'patch-tests
(lambda _
(substitute* "regress/test-exec.sh"