147 lines
5.4 KiB
Diff
147 lines
5.4 KiB
Diff
From d238e71d979dce51afed11b9b8af0898be5daafe Mon Sep 17 00:00:00 2001
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From: Vit Mojzis <vmojzis@redhat.com>
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Date: Mon, 29 Jul 2024 13:26:45 +0200
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Subject: [PATCH] libsemanage: Preserve file context and ownership in policy
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store
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Make sure that file context (all parts) and ownership of
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files/directories in policy store does not change no matter which user
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and under which context executes policy rebuild.
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Fixes:
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# semodule -B
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# ls -lZ /etc/selinux/targeted/contexts/files
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-rw-r--r--. 1 root root unconfined_u:object_r:file_context_t:s0 421397 Jul 11 09:57 file_contexts
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-rw-r--r--. 1 root root unconfined_u:object_r:file_context_t:s0 593470 Jul 11 09:57 file_contexts.bin
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-rw-r--r--. 1 root root unconfined_u:object_r:file_context_t:s0 14704 Jul 11 09:57 file_contexts.homedirs
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-rw-r--r--. 1 root root unconfined_u:object_r:file_context_t:s0 20289 Jul 11 09:57 file_contexts.homedirs.bin
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SELinux user changed from system_u to the user used to execute semodule
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# capsh --user=testuser --caps="cap_dac_override,cap_chown+eip" --addamb=cap_dac_override,cap_chown -- -c "semodule -B"
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# ls -lZ /etc/selinux/targeted/contexts/files
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-rw-r--r--. 1 testuser testuser unconfined_u:object_r:file_context_t:s0 421397 Jul 19 09:10 file_contexts
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-rw-r--r--. 1 testuser testuser unconfined_u:object_r:file_context_t:s0 593470 Jul 19 09:10 file_contexts.bin
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-rw-r--r--. 1 testuser testuser unconfined_u:object_r:file_context_t:s0 14704 Jul 19 09:10 file_contexts.homedirs
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-rw-r--r--. 1 testuser testuser unconfined_u:object_r:file_context_t:s0 20289 Jul 19 09:10 file_contexts.homedirs.bin
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Both file context and ownership changed -- causes remote login
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failures and other issues in some scenarios.
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Signed-off-by: Vit Mojzis <vmojzis@redhat.com>
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Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com>
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---
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libsemanage/src/semanage_store.c | 32 ++++++++++++++++++++++++++++++++
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libsemanage/src/semanage_store.h | 1 +
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2 files changed, 33 insertions(+)
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diff --git a/libsemanage/src/semanage_store.c b/libsemanage/src/semanage_store.c
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index 27c5d349..0ac2e5b2 100644
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--- a/libsemanage/src/semanage_store.c
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+++ b/libsemanage/src/semanage_store.c
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@@ -36,6 +36,7 @@ typedef struct dbase_policydb dbase_t;
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#include "database_policydb.h"
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#include "handle.h"
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+#include <selinux/restorecon.h>
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#include <selinux/selinux.h>
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#include <sepol/policydb.h>
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#include <sepol/module.h>
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@@ -767,6 +768,7 @@ int semanage_copy_file(const char *src, const char *dst, mode_t mode,
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if (!retval && rename(tmp, dst) == -1)
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return -1;
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+ semanage_setfiles(dst);
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out:
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errno = errsv;
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return retval;
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@@ -819,6 +821,8 @@ static int semanage_copy_dir_flags(const char *src, const char *dst, int flag)
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goto cleanup;
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}
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umask(mask);
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+
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+ semanage_setfiles(dst);
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}
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for (i = 0; i < len; i++) {
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@@ -837,6 +841,7 @@ static int semanage_copy_dir_flags(const char *src, const char *dst, int flag)
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goto cleanup;
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}
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umask(mask);
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+ semanage_setfiles(path2);
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} else if (S_ISREG(sb.st_mode) && flag == 1) {
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mask = umask(0077);
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if (semanage_copy_file(path, path2, sb.st_mode,
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@@ -938,6 +943,7 @@ int semanage_mkdir(semanage_handle_t *sh, const char *path)
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}
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umask(mask);
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+ semanage_setfiles(path);
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}
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else {
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/* check that it really is a directory */
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@@ -1614,16 +1620,19 @@ static int semanage_validate_and_compile_fcontexts(semanage_handle_t * sh)
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semanage_final_path(SEMANAGE_FINAL_TMP, SEMANAGE_FC)) != 0) {
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goto cleanup;
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}
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+ semanage_setfiles(semanage_final_path(SEMANAGE_FINAL_TMP, SEMANAGE_FC_BIN));
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if (sefcontext_compile(sh,
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semanage_final_path(SEMANAGE_FINAL_TMP, SEMANAGE_FC_LOCAL)) != 0) {
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goto cleanup;
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}
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+ semanage_setfiles(semanage_final_path(SEMANAGE_FINAL_TMP, SEMANAGE_FC_LOCAL_BIN));
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if (sefcontext_compile(sh,
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semanage_final_path(SEMANAGE_FINAL_TMP, SEMANAGE_FC_HOMEDIRS)) != 0) {
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goto cleanup;
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}
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+ semanage_setfiles(semanage_final_path(SEMANAGE_FINAL_TMP, SEMANAGE_FC_HOMEDIRS_BIN));
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status = 0;
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cleanup:
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@@ -3018,3 +3027,26 @@ int semanage_nc_sort(semanage_handle_t * sh, const char *buf, size_t buf_len,
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return 0;
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}
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+
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+/* Make sure the file context and ownership of files in the policy
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+ * store does not change */
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+void semanage_setfiles(const char *path){
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+ struct stat sb;
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+ int fd;
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+ /* Fix the user and role portions of the context, ignore errors
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+ * since this is not a critical operation */
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+ selinux_restorecon(path, SELINUX_RESTORECON_SET_SPECFILE_CTX | SELINUX_RESTORECON_IGNORE_NOENTRY);
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+
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+ /* Make sure "path" is owned by root */
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+ if ((geteuid() != 0 || getegid() != 0) &&
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+ ((fd = open(path, O_RDONLY)) != -1)){
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+ /* Skip files with the SUID or SGID bit set -- abuse protection */
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+ if ((fstat(fd, &sb) != -1) &&
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+ !(S_ISREG(sb.st_mode) &&
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+ (sb.st_mode & (S_ISUID | S_ISGID))) &&
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+ (fchown(fd, 0, 0) == -1))
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+ fprintf(stderr, "Warning! Could not set ownership of %s to root\n", path);
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+
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+ close(fd);
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+ }
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+}
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diff --git a/libsemanage/src/semanage_store.h b/libsemanage/src/semanage_store.h
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index 1fc77da8..e21dadeb 100644
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--- a/libsemanage/src/semanage_store.h
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+++ b/libsemanage/src/semanage_store.h
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@@ -124,6 +124,7 @@ int semanage_get_cil_paths(semanage_handle_t * sh, semanage_module_info_t *modin
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int semanage_get_active_modules(semanage_handle_t *sh,
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semanage_module_info_t **modinfo, int *num_modules);
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+void semanage_setfiles(const char *path);
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/* lock file routines */
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int semanage_get_trans_lock(semanage_handle_t * sh);
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--
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2.45.2
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