[source] dropbear: add option to set max auth tries

[LEDE Commits]

jow pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/d413c75d24f9fe231b992c47b1367b095f4571fc

commit d413c75d24f9fe231b992c47b1367b095f4571fc
Author: Stijn Tintel <stijn at linux-ipv6.be>
AuthorDate: Tue Jun 27 22:30:01 2017 +0200

    dropbear: add option to set max auth tries
    
    Add a uci option to set the new max auth tries paramater in dropbear.
    Set the default to 3, as 10 seems excessive.
    
    Signed-off-by: Stijn Tintel <stijn at linux-ipv6.be>
    (cherry picked from commit 6371159b4ae8b4dd94d6319ac805b0c26962bb14)
---
 package/network/services/dropbear/Makefile            | 2 +-
 package/network/services/dropbear/files/dropbear.init | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/package/network/services/dropbear/Makefile b/package/network/services/dropbear/Makefile
index 05df1bc..7302db2 100644
--- a/package/network/services/dropbear/Makefile
+++ b/package/network/services/dropbear/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=dropbear
 PKG_VERSION:=2017.75
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:= \
diff --git a/package/network/services/dropbear/files/dropbear.init b/package/network/services/dropbear/files/dropbear.init
index 2d23ebd..3d8cb2c 100755
--- a/package/network/services/dropbear/files/dropbear.init
+++ b/package/network/services/dropbear/files/dropbear.init
@@ -41,6 +41,7 @@ validate_section_dropbear()
 		'Port:list(port):22' \
 		'SSHKeepAlive:uinteger:300' \
 		'IdleTimeout:uinteger:0' \
+		'MaxAuthTries:uinteger:3' \
 		'mdns:bool:1'
 }
 
@@ -49,7 +50,7 @@ dropbear_instance()
 	local PasswordAuth enable Interface GatewayPorts \
 		RootPasswordAuth RootLogin rsakeyfile \
 		BannerFile Port SSHKeepAlive IdleTimeout \
-		mdns ipaddrs
+		MaxAuthTries mdns ipaddrs
 
 	validate_section_dropbear "${1}" || {
 		echo "validation failed"
@@ -78,6 +79,7 @@ dropbear_instance()
 	append_ports "${ipaddrs}" "${Port}"
 	[ "${IdleTimeout}" -ne 0 ] && procd_append_param command -I "${IdleTimeout}"
 	[ "${SSHKeepAlive}" -ne 0 ] && procd_append_param command -K "${SSHKeepAlive}"
+	[ "${MaxAuthTries}" -ne 0 ] && procd_append_param command -T "${MaxAuthTries}"
 	[ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
 	procd_set_param respawn
 	procd_close_instance