Adding upstream version 2.9.4.upstream/2.9.4

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

1 files changed, 105 insertions, 0 deletions

diff --git a/src/util/check_file.c b/src/util/check_file.c
new file mode 100644
index 0000000..2203a41
--- /dev/null
+++ b/src/util/check_file.c
@@ -0,0 +1,105 @@
+/*
+    SSSD
+
+    Check file permissions
+
+    Authors:
+        Sumit Bose <sbose@redhat.com>
+
+    Copyright (C) 2009 Red Hat
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "util/util.h"
+
+static errno_t perform_checks(const char *filename,
+                              struct stat *stat_buf,
+                              uid_t uid, gid_t gid,
+                              mode_t mode, mode_t mask);
+
+errno_t check_file(const char *filename,
+                   uid_t uid, uid_t gid, mode_t mode, mode_t mask,
+                   struct stat *caller_stat_buf, bool follow_symlink)
+{
+    int ret;
+    struct stat local_stat_buf;
+    struct stat *stat_buf;
+
+    if (caller_stat_buf == NULL) {
+        stat_buf = &local_stat_buf;
+    } else {
+        stat_buf = caller_stat_buf;
+    }
+
+    if (follow_symlink) {
+        ret = stat(filename, stat_buf);
+    } else {
+        ret = lstat(filename, stat_buf);
+    }
+    if (ret == -1) {
+        ret = errno;
+        DEBUG(SSSDBG_TRACE_FUNC, "lstat for '%s' failed: [%d][%s].\n",
+                                 filename, ret, strerror(ret));
+        return ret;
+    }
+
+    return perform_checks(filename, stat_buf, uid, gid, mode, mask);
+}
+
+static errno_t perform_checks(const char *filename,
+                              struct stat *stat_buf,
+                              uid_t uid, gid_t gid,
+                              mode_t mode, mode_t mask)
+{
+    mode_t st_mode;
+
+    if (mask) {
+        st_mode = stat_buf->st_mode & mask;
+    } else {
+        st_mode = stat_buf->st_mode & (S_IFMT|ALLPERMS);
+    }
+
+    if ((mode & S_IFMT) != (st_mode & S_IFMT)) {
+        DEBUG(SSSDBG_TRACE_LIBS, "File '%s' is not of the right type.\n",
+              filename);
+        return EINVAL;
+    }
+
+    if ((st_mode & ALLPERMS) != (mode & ALLPERMS)) {
+        DEBUG(SSSDBG_TRACE_LIBS,
+              "File '%s' has the wrong (bit masked) mode [%.7o], "
+              "expected [%.7o].\n", filename,
+              (st_mode & ALLPERMS), (mode & ALLPERMS));
+        return EINVAL;
+    }
+
+    if (uid != (uid_t)(-1) && stat_buf->st_uid != uid) {
+        DEBUG(SSSDBG_TRACE_LIBS, "File '%s' must be owned by uid [%d].\n",
+              filename, uid);
+        return EINVAL;
+    }
+
+    if (gid != (gid_t)(-1) && stat_buf->st_gid != gid) {
+        DEBUG(SSSDBG_TRACE_LIBS, "File '%s' must be owned by gid [%d].\n",
+              filename, gid);
+        return EINVAL;
+    }
+
+    return EOK;
+}