main/alpine-baselayout: sysctl security changes.

1 files changed, 36 insertions, 2 deletions

diff --git a/main/alpine-baselayout/APKBUILD b/main/alpine-baselayout/APKBUILD
index 87229ccf70..2e1a8673a2 100644
--- a/main/alpine-baselayout/APKBUILD
+++ b/main/alpine-baselayout/APKBUILD
@@ -1,8 +1,8 @@
 # Contributor: Sören Tempel <soeren+alpine@soeren-tempel.net>
 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=alpine-baselayout
-pkgver=3.0.5
-pkgrel=3
+pkgver=3.0.6
+pkgrel=0
 pkgdesc="Alpine base dir structure and init scripts"
 url="https://git.alpinelinux.org/cgit/aports/tree/main/alpine-baselayout"
 arch="all"
@@ -145,11 +145,45 @@ package() {
                 # content of this file will override /etc/sysctl.d/*
         EOF
         cat > "$pkgdir"/etc/sysctl.d/00-alpine.conf <<-EOF
+                # Prevents SYN DOS attacks. Applies to ipv6 as well, despite name.
                 net.ipv4.tcp_syncookies = 1
+
+                # Prevents ip spoofing.
                 net.ipv4.conf.default.rp_filter = 1
                 net.ipv4.conf.all.rp_filter = 1
+
+                # Only groups within this id range can use ping.
                 net.ipv4.ping_group_range=999 59999
+
+                # Redirects can potentially be used to maliciously alter hosts
+                # routing tables.
+                net.ipv4.conf.all.accept_redirects = 0
+                net.ipv4.conf.all.secure_redirects = 1
+                net.ipv6.conf.all.accept_redirects = 0
+                net.ipv6.conf.all.secure_redirects = 1
+
+                # The source routing feature includes some known vulnerabilities.
+                net.ipv4.conf.all.accept_source_route = 0
+                net.ipv6.conf.all.accept_source-route = 0
+
+                # See RFC 1337
+                net.ipv4.tcp_rfc1337 = 1
+
+                ## Enable IPv6 Privacy Extensions (see RFC4941 and RFC3041)
+                net.ipv6.conf.default.use_tempaddr = 2
+                net.ipv6.conf.all.use_tempaddr = 2
+
+                # Restarts computer after 120 seconds after kernel panic
                 kernel.panic = 120
+
+                ## Disable magic-sysrq key
+                kernel.sysrq = 0
+
+                # Users should not be able to create soft or hard links to files
+                # which they do not own. This mitigates several privilege
+                # escalation vulnerabilities.
+                fs.protected_hardlinks = 1
+                fs.protected_symlinks = 1
         EOF
         cat > "$pkgdir"/etc/fstab <<-EOF
                 /dev/cdrom      /media/cdrom    iso9660 noauto,ro 0 0