60 lines
1.9 KiB
Diff
60 lines
1.9 KiB
Diff
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From 61414430c6bd6c9c9bfa1512880ecc6adbdbf9b4 Mon Sep 17 00:00:00 2001
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From: Andrew Bartlett <abartlet@samba.org>
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Date: Thu, 21 Mar 2019 17:24:14 +1300
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Subject: [PATCH 5/5] CVE-2019-3870 pysmbd: Ensure a zero umask is set for
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smbd.mkdir()
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mkdir() is the other call that requires a umask of 0 in Samba.
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BUG: https://bugzilla.samba.org/show_bug.cgi?id=13834
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Signed-off-by: Andrew Bartlett <abartlet@samba.org>
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Reviewed-by: Jeremy Allison <jra@samba.org>
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---
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selftest/knownfail.d/pymkdir-umask | 1 -
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source3/smbd/pysmbd.c | 11 ++++++++++-
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2 files changed, 10 insertions(+), 2 deletions(-)
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delete mode 100644 selftest/knownfail.d/pymkdir-umask
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diff --git a/selftest/knownfail.d/pymkdir-umask b/selftest/knownfail.d/pymkdir-umask
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deleted file mode 100644
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index 5af01be44e3..00000000000
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--- a/selftest/knownfail.d/pymkdir-umask
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+++ /dev/null
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@@ -1 +0,0 @@
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-^samba.tests.ntacls_backup.samba.tests.ntacls_backup.NtaclsBackupRestoreTests.test_smbd_mkdir
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\ No newline at end of file
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diff --git a/source3/smbd/pysmbd.c b/source3/smbd/pysmbd.c
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index 179a1ee2943..845ea25f936 100644
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--- a/source3/smbd/pysmbd.c
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+++ b/source3/smbd/pysmbd.c
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@@ -739,6 +739,8 @@ static PyObject *py_smbd_mkdir(PyObject *self, PyObject *args, PyObject *kwargs)
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TALLOC_CTX *frame = talloc_stackframe();
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struct connection_struct *conn = NULL;
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struct smb_filename *smb_fname = NULL;
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+ int ret;
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+ mode_t saved_umask;
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if (!PyArg_ParseTupleAndKeywords(args,
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kwargs,
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@@ -769,8 +771,15 @@ static PyObject *py_smbd_mkdir(PyObject *self, PyObject *args, PyObject *kwargs)
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return NULL;
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}
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+ /* we want total control over the permissions on created files,
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+ so set our umask to 0 */
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+ saved_umask = umask(0);
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+
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+ ret = SMB_VFS_MKDIR(conn, smb_fname, 00755);
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- if (SMB_VFS_MKDIR(conn, smb_fname, 00755) == -1) {
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+ umask(saved_umask);
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+
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+ if (ret == -1) {
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DBG_ERR("mkdir error=%d (%s)\n", errno, strerror(errno));
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TALLOC_FREE(frame);
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return NULL;
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--
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2.11.0
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