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Merge pull request #6230 from Security-Onion-Solutions/fix/cidr-full-validation-bash

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Check CIDR validity completely
This commit is contained in:
Mike Reeves
2021-11-15 15:43:58 -05:00
committed by GitHub
parent a8aae544d5 f674555290
commit 85c0b0818b
1 changed files with 6 additions and 5 deletions
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11
salt/common/tools/sbin/so-common
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@@ -393,14 +393,15 @@ valid_cidr() {
# Verify there is a backslash in the string
echo "$1" | grep -qP "^[^/]+/[^/]+$" || return 1
local cidr
local cidr="$1"
local ip
cidr=$(echo "$1" | sed 's/.*\///')
ip=$(echo "$1" | sed 's/\/.*//' )
ip=$(echo "$cidr" | sed 's/\/.*//' )
if valid_ip4 "$ip"; then
[[ $cidr =~ ([0-9]|[1-2][0-9]|3[0-2]) ]] && return 0 || return 1
local ip1 ip2 ip3 ip4 N
IFS="./" read -r ip1 ip2 ip3 ip4 N <<< "$cidr"
ip_total=$((ip1 * 256 ** 3 + ip2 * 256 ** 2 + ip3 * 256 + ip4))
[[ $((ip_total % 2**(32-N))) == 0 ]] && return 0 || return 1
else
return 1
fi