[Pkg-samba-maint] [samba] 09/12: CVE-2017-12151: s3:libsmb: add cli_state_is_encryption_on() helper function

[Mathieu Parent]

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sathieu pushed a commit to branch stretch-security
in repository samba.

commit 38c98c74d1980ad86afedda436fc24d5a139ac23
Author: Stefan Metzmacher <metze at samba.org>
Date:   Mon Aug 14 12:13:18 2017 +0200

    CVE-2017-12151: s3:libsmb: add cli_state_is_encryption_on() helper function
    
    This allows to check if the current cli_state uses encryption
    (either via unix extentions or via SMB3).
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=12996
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
---
 source3/libsmb/clientgen.c | 13 +++++++++++++
 source3/libsmb/proto.h     |  1 +
 2 files changed, 14 insertions(+)

diff --git a/source3/libsmb/clientgen.c b/source3/libsmb/clientgen.c
index bc5c1b1..3e8523e 100644
--- a/source3/libsmb/clientgen.c
+++ b/source3/libsmb/clientgen.c
@@ -339,6 +339,19 @@ uint32_t cli_getpid(struct cli_state *cli)
 	return cli->smb1.pid;
 }
 
+bool cli_state_is_encryption_on(struct cli_state *cli)
+{
+	if (smbXcli_conn_protocol(cli->conn) < PROTOCOL_SMB2_02) {
+		return smb1cli_conn_encryption_on(cli->conn);
+	}
+
+	if (cli->smb2.tcon == NULL) {
+		return false;
+	}
+
+	return smb2cli_tcon_is_encryption_on(cli->smb2.tcon);
+}
+
 bool cli_state_has_tcon(struct cli_state *cli)
 {
 	uint16_t tid = cli_state_get_tid(cli);
diff --git a/source3/libsmb/proto.h b/source3/libsmb/proto.h
index c0e1b74..d474c7f 100644
--- a/source3/libsmb/proto.h
+++ b/source3/libsmb/proto.h
@@ -174,6 +174,7 @@ const char *cli_state_remote_realm(struct cli_state *cli);
 uint16_t cli_state_get_vc_num(struct cli_state *cli);
 uint32_t cli_setpid(struct cli_state *cli, uint32_t pid);
 uint32_t cli_getpid(struct cli_state *cli);
+bool cli_state_is_encryption_on(struct cli_state *cli);
 bool cli_state_has_tcon(struct cli_state *cli);
 uint16_t cli_state_get_tid(struct cli_state *cli);
 uint16_t cli_state_set_tid(struct cli_state *cli, uint16_t tid);

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