From d23386f61d810dab77e9d9d9130adbd826ea823f Mon Sep 17 00:00:00 2001

From: Michal Sekletar <msekleta@redhat.com>

Date: Thu, 7 Sep 2017 15:49:08 +0200

Subject: [PATCH] tmpfiles: substitute % specifiers in arguments for writing

 files and xattrs

(cherry-picked from commit bd550f78eb261c757cbff85acdb55563c56521f2)

Related: #1299714

---

 src/tmpfiles/tmpfiles.c | 79 ++++++++++++++++++++++-------------------

 1 file changed, 42 insertions(+), 37 deletions(-)

diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c

index 70e0cc2fa3..ddb274fcec 100644

--- a/src/tmpfiles/tmpfiles.c

+++ b/src/tmpfiles/tmpfiles.c

@@ -151,6 +151,14 @@ static const char conf_file_dirs[] = CONF_DIRS_NULSTR("tmpfiles");

 static Hashmap *items = NULL, *globs = NULL;

 static Set *unix_sockets = NULL;

+static const Specifier specifier_table[] = {

+        { 'm', specifier_machine_id, NULL },

+        { 'b', specifier_boot_id, NULL },

+        { 'H', specifier_host_name, NULL },

+        { 'v', specifier_kernel_release, NULL },

+        {}

+};

+

 static bool needs_glob(ItemType t) {

         return IN_SET(t,

                       WRITE_FILE,

@@ -657,8 +665,7 @@ static int path_set_perms(Item *i, const char *path) {

         return label_fix(path, false, false);

 }

-static int get_xattrs_from_arg(Item *i) {

-        char *xattr;

+static int parse_xattrs_from_arg(Item *i) {

         const char *p;

         int r;

@@ -667,35 +674,37 @@ static int get_xattrs_from_arg(Item *i) {

         p = i->argument;

-        while ((r = unquote_first_word(&p, &xattr, false)) > 0) {

-                _cleanup_free_ char *tmp = NULL, *name = NULL,

-                        *value = NULL, *value2 = NULL, *_xattr = xattr;

+        for (;;) {

+                _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL, *xattr_replaced = NULL;

+

+                r = unquote_first_word(&p, &xattr, false);

+                if (r < 0)

+                        log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);

+                if (r <= 0)

+                        break;

+

+                r = specifier_printf(xattr, specifier_table, NULL, &xattr_replaced);

+                if (r < 0)

+                        return log_error_errno(r, "Failed to replace specifiers in extended attribute '%s': %m", xattr);

-                r = split_pair(xattr, "=", &name, &value);

+                r = split_pair(xattr_replaced, "=", &name, &value);

                 if (r < 0) {

                         log_warning("Illegal xattr found: \"%s\" - ignoring.", xattr);

                         continue;

                 }

-                if (strempty(name) || strempty(value)) {

-                        log_warning("Malformed xattr found: \"%s\" - ignoring.", xattr);

+                if (isempty(name) || isempty(value)) {

+                        log_warning("Malformed extended attribute found, ignoring: %s", xattr);

                         continue;

                 }

-                tmp = unquote(value, "\"");

-                if (!tmp)

-                        return log_oom();

-

-                value2 = cunescape(tmp);

-                if (!value2)

+                if (strv_push_pair(&i->xattrs, name, value) < 0)

                         return log_oom();

-                if (strv_push_pair(&i->xattrs, name, value2) < 0)

-                        return log_oom();

-                name = value2 = NULL;

+                name = value = NULL;

         }

-        return r;

+        return 0;

 }

 static int path_set_xattrs(Item *i, const char *path) {

@@ -708,17 +717,16 @@ static int path_set_xattrs(Item *i, const char *path) {

                 int n;

                 n = strlen(*value);

-                log_debug("\"%s\": setting xattr \"%s=%s\"", path, *name, *value);

+                log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);

                 if (lsetxattr(path, *name, *value, n, 0) < 0) {

-                        log_error("Setting extended attribute %s=%s on %s failed: %m",

-                                  *name, *value, path);

+                        log_error("Setting extended attribute %s=%s on %s failed: %m", *name, *value, path);

                         return -errno;

                 }

         }

         return 0;

 }

-static int get_acls_from_arg(Item *item) {

+static int parse_acls_from_arg(Item *item) {

 #ifdef HAVE_ACL

         int r;

@@ -726,6 +734,7 @@ static int get_acls_from_arg(Item *item) {

         /* If force (= modify) is set, we will not modify the acl

          * afterwards, so the mask can be added now if necessary. */

+

         r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->force);

         if (r < 0)

                 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring",

@@ -839,7 +848,7 @@ static int path_set_acls(Item *item, const char *path) {

          FS_TOPDIR_FL       |                   \

          FS_NOCOW_FL)

-static int get_attribute_from_arg(Item *item) {

+static int parse_attribute_from_arg(Item *item) {

         static const struct {

                 char character;

@@ -993,7 +1002,7 @@ static int write_one_file(Item *i, const char *path) {

         }

         if (i->argument) {

-                _cleanup_free_ char *unescaped;

+                _cleanup_free_ char *unescaped = NULL, *replaced = NULL;

                 log_debug("%s to \"%s\".",

                           i->type == CREATE_FILE ? "Appending" : "Writing", path);

@@ -1002,7 +1011,11 @@ static int write_one_file(Item *i, const char *path) {

                 if (!unescaped)

                         return log_oom();

-                r = loop_write(fd, unescaped, strlen(unescaped), false);

+                r = specifier_printf(unescaped, specifier_table, NULL, &replaced);

+                if (r < 0)

+                        return log_error_errno(r, "Failed to replace specifiers in parameter to write '%s': %m", unescaped);

+

+                r = loop_write(fd, replaced, strlen(replaced), false);

                 if (r < 0)

                         return log_error_errno(r, "Failed to write file \"%s\": %m", path);

         } else

@@ -1712,14 +1725,6 @@ static bool should_include_path(const char *path) {

 static int parse_line(const char *fname, unsigned line, const char *buffer) {

-        static const Specifier specifier_table[] = {

-                { 'm', specifier_machine_id, NULL },

-                { 'b', specifier_boot_id, NULL },

-                { 'H', specifier_host_name, NULL },

-                { 'v', specifier_kernel_release, NULL },

-                {}

-        };

-

         _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;

         _cleanup_(item_free_contents) Item i = {};

         ItemArray *existing;

@@ -1801,7 +1806,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {

         case RELABEL_PATH:

         case RECURSIVE_RELABEL_PATH:

                 if (i.argument)

-                        log_warning("[%s:%u] %c lines don't take argument field, ignoring.", fname, line, i.type);

+                        log_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type);

                 break;

@@ -1861,7 +1866,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {

                         log_error("[%s:%u] Set extended attribute requires argument.", fname, line);

                         return -EBADMSG;

                 }

-                r = get_xattrs_from_arg(&i);

+                r = parse_xattrs_from_arg(&i);

                 if (r < 0)

                         return r;

                 break;

@@ -1872,7 +1877,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {

                         log_error("[%s:%u] Set ACLs requires argument.", fname, line);

                         return -EBADMSG;

                 }

-                r = get_acls_from_arg(&i);

+                r = parse_acls_from_arg(&i);

                 if (r < 0)

                         return r;

                 break;

@@ -1883,7 +1888,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {

                         log_error("[%s:%u] Set file attribute requires argument.", fname, line);

                         return -EBADMSG;

                 }

-                r = get_attribute_from_arg(&i);

+                r = parse_attribute_from_arg(&i);

                 if (r < 0)

                         return r;

                 break;