Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 166 insertions, 0 deletions

diff --git a/src/shared/extension-util.c b/src/shared/extension-util.c
new file mode 100644
index 0000000..d8b16b9
--- /dev/null
+++ b/src/shared/extension-util.c
@@ -0,0 +1,166 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "architecture.h"
+#include "chase.h"
+#include "env-util.h"
+#include "extension-util.h"
+#include "log.h"
+#include "os-util.h"
+#include "strv.h"
+
+int extension_release_validate(
+                const char *name,
+                const char *host_os_release_id,
+                const char *host_os_release_version_id,
+                const char *host_os_extension_release_level,
+                const char *host_extension_scope,
+                char **extension_release,
+                ImageClass image_class) {
+
+        const char *extension_release_id = NULL, *extension_release_level = NULL, *extension_architecture = NULL;
+        const char *extension_level = image_class == IMAGE_CONFEXT ? "CONFEXT_LEVEL" : "SYSEXT_LEVEL";
+        const char *extension_scope = image_class == IMAGE_CONFEXT ? "CONFEXT_SCOPE" : "SYSEXT_SCOPE";
+
+        assert(name);
+        assert(!isempty(host_os_release_id));
+
+        /* Now that we can look into the extension/confext image, let's see if the OS version is compatible */
+        if (strv_isempty(extension_release)) {
+                log_debug("Extension '%s' carries no release data, ignoring.", name);
+                return 0;
+        }
+
+        if (host_extension_scope) {
+                _cleanup_strv_free_ char **scope_list = NULL;
+                const char *scope;
+                bool valid;
+
+                scope = strv_env_pairs_get(extension_release, extension_scope);
+                if (scope) {
+                        scope_list = strv_split(scope, WHITESPACE);
+                        if (!scope_list)
+                                return -ENOMEM;
+                }
+
+                /* By default extension are good for attachment in portable service and on the system */
+                valid = strv_contains(
+                        scope_list ?: STRV_MAKE("system", "portable"),
+                        host_extension_scope);
+                if (!valid) {
+                        log_debug("Extension '%s' is not suitable for scope %s, ignoring.", name, host_extension_scope);
+                        return 0;
+                }
+        }
+
+        /* When the architecture field is present and not '_any' it must match the host - for now just look at uname but in
+         * the future we could check if the kernel also supports 32 bit or binfmt has a translator set up for the architecture */
+        extension_architecture = strv_env_pairs_get(extension_release, "ARCHITECTURE");
+        if (!isempty(extension_architecture) && !streq(extension_architecture, "_any") &&
+        !streq(architecture_to_string(uname_architecture()), extension_architecture)) {
+                log_debug("Extension '%s' is for architecture '%s', but deployed on top of '%s'.",
+                        name, extension_architecture, architecture_to_string(uname_architecture()));
+                return 0;
+        }
+
+        extension_release_id = strv_env_pairs_get(extension_release, "ID");
+        if (isempty(extension_release_id)) {
+                log_debug("Extension '%s' does not contain ID in release file but requested to match '%s' or be '_any'",
+                        name, host_os_release_id);
+                return 0;
+        }
+
+        /* A sysext(or confext) with no host OS dependency (static binaries or scripts) can match
+         * '_any' host OS, and VERSION_ID or SYSEXT_LEVEL(or CONFEXT_LEVEL) are not required anywhere */
+        if (streq(extension_release_id, "_any")) {
+                log_debug("Extension '%s' matches '_any' OS.", name);
+                return 1;
+        }
+
+        if (!streq(host_os_release_id, extension_release_id)) {
+                log_debug("Extension '%s' is for OS '%s', but deployed on top of '%s'.",
+                          name, extension_release_id, host_os_release_id);
+                return 0;
+        }
+
+        /* Rolling releases do not typically set VERSION_ID (eg: ArchLinux) */
+        if (isempty(host_os_release_version_id) && isempty(host_os_extension_release_level)) {
+                log_debug("No version info on the host (rolling release?), but ID in %s matched.", name);
+                return 1;
+        }
+
+        /* If the extension has a sysext API level declared, then it must match the host API
+         * level. Otherwise, compare OS version as a whole */
+        extension_release_level = strv_env_pairs_get(extension_release, extension_level);
+        if (!isempty(host_os_extension_release_level) && !isempty(extension_release_level)) {
+                if (!streq_ptr(host_os_extension_release_level, extension_release_level)) {
+                        log_debug("Extension '%s' is for API level '%s', but running on API level '%s'",
+                                name, strna(extension_release_level), strna(host_os_extension_release_level));
+                        return 0;
+                }
+        } else if (!isempty(host_os_release_version_id)) {
+                const char *extension_release_version_id;
+
+                extension_release_version_id = strv_env_pairs_get(extension_release, "VERSION_ID");
+                if (isempty(extension_release_version_id)) {
+                        log_debug("Extension '%s' does not contain VERSION_ID in release file but requested to match '%s'",
+                                  name, strna(host_os_release_version_id));
+                        return 0;
+                }
+
+                if (!streq_ptr(host_os_release_version_id, extension_release_version_id)) {
+                        log_debug("Extension '%s' is for OS '%s', but deployed on top of '%s'.",
+                                  name, strna(extension_release_version_id), strna(host_os_release_version_id));
+                        return 0;
+                }
+        } else if (isempty(host_os_release_version_id) && isempty(host_os_extension_release_level)) {
+                /* Rolling releases do not typically set VERSION_ID (eg: ArchLinux) */
+                log_debug("No version info on the host (rolling release?), but ID in %s matched.", name);
+                return 1;
+        }
+
+        log_debug("Version info of extension '%s' matches host.", name);
+        return 1;
+}
+
+int parse_env_extension_hierarchies(char ***ret_hierarchies, const char *hierarchy_env) {
+        _cleanup_free_ char **l = NULL;
+        int r;
+
+        assert(hierarchy_env);
+        r = getenv_path_list(hierarchy_env, &l);
+        if (r == -ENXIO) {
+                if (streq(hierarchy_env, "SYSTEMD_CONFEXT_HIERARCHIES"))
+                        /* Default for confext when unset */
+                        l = strv_new("/etc");
+                else if (streq(hierarchy_env, "SYSTEMD_SYSEXT_HIERARCHIES"))
+                        /* Default for sysext when unset */
+                        l = strv_new("/usr", "/opt");
+                else if (streq(hierarchy_env, "SYSTEMD_SYSEXT_AND_CONFEXT_HIERARCHIES"))
+                        /* Combined sysext and confext directories */
+                        l = strv_new("/usr", "/opt", "/etc");
+                else
+                        return -ENXIO;
+        } else if (r < 0)
+                return r;
+
+        *ret_hierarchies = TAKE_PTR(l);
+        return 0;
+}
+
+int extension_has_forbidden_content(const char *root) {
+        int r;
+
+        /* Insist that extension images do not overwrite the underlying OS release file (it's fine if
+         * they place one in /etc/os-release, i.e. where things don't matter, as they aren't
+         * merged.) */
+        r = chase("/usr/lib/os-release", root, CHASE_PREFIX_ROOT, NULL, NULL);
+        if (r > 0) {
+                log_debug("Extension contains '/usr/lib/os-release', which is not allowed, refusing.");
+                return 1;
+        }
+        if (r < 0 && r != -ENOENT)
+                return log_debug_errno(r, "Failed to determine whether '/usr/lib/os-release' exists in the extension: %m");
+
+        return 0;
+}