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471 lines
13 KiB
471 lines
13 KiB
#!/usr/bin/env bash |
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set -o pipefail |
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die(){ |
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echo "$@" >&2 |
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exit 1 |
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} |
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#RED='\033[0;31m' |
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RED='\033[1;31m' |
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YELLOW='\033[1;33m' |
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GREEN='\033[1;32m' |
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LBLUE='\033[1;34m' |
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LCYAN='\033[1;36m' |
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ORANGE='\033[0;33m' |
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LGREY='\033[0;37m' |
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BOLDJ='\033[1;37m' |
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NC='\033[0m' # No Color |
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stripAnsi(){ |
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sed -r "s/\x1B\[([0-9]{1,3}(;[0-9]{1,2})?)?[mGK]//g" |
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} |
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trimWhitespace(){ |
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sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' |
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} |
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#wrapped echo |
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wecho(){ |
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builtin echo -e "$@" | fold -s -w 80 |
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} |
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drawInBox(){ |
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innerWidth="45" |
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echo -en "${LBLUE}╭" |
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head -c $innerWidth /dev/zero | tr '\0' '-' |
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echo -e "╮${NC}" |
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while IFS= read -r line; do |
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# The ansi characters mess up the string length so we need to strip them to calculate the width |
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stripped="$(echo -n "$line" | stripAnsi)" |
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leftPad=$(( ( innerWidth - ${#stripped} ) / 2)) |
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rightPad=$(( ( innerWidth - leftPad ) - ${#stripped} )) |
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echo -en "${LBLUE}|${NC}" |
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head -c $leftPad /dev/zero | tr '\0' ' ' |
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echo -n "$line" |
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head -c $rightPad /dev/zero | tr '\0' ' ' |
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echo -e "${LBLUE}|${NC}" |
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done |
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echo -en "${LBLUE}╰" |
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head -c $innerWidth /dev/zero | tr '\0' '-' |
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echo -e "╯${NC}" |
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} |
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# gets the colour that should be output |
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# 0 = green |
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# 1 = yellow |
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# 2 = red |
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getColour(){ |
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case "$1" in |
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0) echo -en "$GREEN" ;; |
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1) echo -en "$YELLOW" ;; |
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2) echo -en "$RED" ;; |
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esac |
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} |
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printKey(){ |
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echo -e "Not checked\ |
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\t${GREEN}Fine${NC}\ |
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\t${YELLOW}Mis-configured${NC}\ |
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\t${RED}Missing${NC}" |
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} |
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generic_version_disclosure(){ |
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local value="$(echo "$1" | cut -d ':' -f 2- | trimWhitespace)" |
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local header="$(echo "$1" | cut -d ':' -f 1 | trimWhitespace)" |
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echo "$header" | drawInBox |
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wecho -e "The server responds with ${ORANGE}$value${NC} in the \ |
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$header header" |
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wecho -e "This is potentially un-necesary information disclosure\n\n" |
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[ -n "$value" ] && return 1 || return 0 |
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} |
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test_server(){ |
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local value="$(echo "$1" | cut -d ':' -f 2 | trimWhitespace)" |
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echo "Server" | drawInBox |
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wecho -e "The server responds with ${ORANGE}$value${NC} in the Server header" |
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wecho -e "This is potentially un-necesary information disclosure\n\n" |
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[ -n "$value" ] && return 1 || return 0 |
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} |
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test_x-powered-by(){ |
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local value="$(echo "$1" | cut -d ':' -f 2 | trimWhitespace)" |
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echo "X-Powered-By" | drawInBox |
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wecho -e "The server responds with ${ORANGE}$value${NC} in the X-Powered-By header" |
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wecho -e "This is potentially un-necesary information disclosure\n\n" |
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[ -n "$value" ] && return 1 || return 0 |
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} |
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test_x-xss-protection(){ |
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local value="$(echo "$1" | cut -d ':' -f 2 | grep -oE '[0-9]+' )" |
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if [ "$value" = "1" ]; then |
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return 0 |
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else |
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echo "X-XSS-Protection" | drawInBox |
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wecho -e "The X-XSS-Protection header asks browsers to try and prevent \ |
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reflected cross site scripting attacks. It has been replaced in modern browsers \ |
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by the content-security-policy although should still be included for the sake \ |
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of old browsers\n\n" |
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return 1 |
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fi |
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} |
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test_x-frame-options(){ |
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local value="$(echo "$1" | cut -d ':' -f 2 | trimWhitespace)" |
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case "$value" in |
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"SAMEORIGIN"|"DENY") return 0 ;; |
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"ALLOW-FROM"*) |
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echo "X-Frame-Opitons" | drawInBox |
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wecho -e "The ALLOW-FROM derivative is obsolete and no longer works \ |
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in modern browsers.\n\n" |
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wecho -e "The Content-Security-Policy HTTP header has a \ |
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frame-ancestors directive which you can use instead.\n\n" |
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return 1 |
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;; |
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*) |
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echo "X-Frame-Opitons" | drawInBox |
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wecho "The X-Frame-Options HTTP response header can be used to \ |
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indicate whether or not a browser should be allowed to render a page in a \ |
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<frame>, <iframe>, <embed> or <object>. Sites can use this to avoid \ |
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click-jacking attacks, by ensuring that their content is not embedded into \ |
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other sites." |
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if echo "$headers" | |
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grep -Eqi '^content-security-policy:.*frame-ancestors.*'; then |
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wecho "It looks like the content security policy contains the \ |
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frame ancestors directive. This also mitigates against the clickjacking \ |
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although browser support isn't as strong meaning you should still include the \ |
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x-frame-options header" |
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fi |
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source=" |
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<!DOCTYPE html> |
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<html> |
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<head> |
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<meta charset='UTF-8' /> |
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<meta name='viewport' content='width=device-width' /> |
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<title>Clickjacking example</title> |
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<style type='text/css' media='screen'> |
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body{ |
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width: 100vw; |
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height: 100vh; |
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border: 2px solid black; |
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} |
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iframe{ |
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border: 3px solid black; |
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width: 80%; |
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height: 80%; |
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margin: 20px auto; |
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display: block; |
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} |
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h1, p{ |
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text-align: center; |
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} |
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</style> |
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</head> |
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<body> |
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<h1>Clickjacking example</h1> |
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<iframe src='$url'> |
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</iframe> |
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<p>If content is rendered above, the site is vulnerable to clickjacking</p> |
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</body> |
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</html> |
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" |
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wecho "To verify, type paste the following into your browser:" |
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echo -e "\ndata:text/html;base64,$(echo "$source" | base64 -w 0)\n\n" |
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return 2 |
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esac |
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} |
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#test_x-content-type-options(){ |
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#} |
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test_content-security-policy(){ |
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local value="$(echo "$1" | cut -d ':' -f 2 | trimWhitespace)" |
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# TODO: work on content security testing |
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if [ -z "$value" ]; then |
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echo "Content-Security-Policy" | drawInBox |
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wecho -e "The HTTP Content-Security-Policy response header allows web site \ |
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administrators to control resources the user agent is allowed to load for a \ |
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given page. With a few exceptions, policies mostly involve specifying server \ |
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origins and script endpoints. This helps guard against cross-site scripting \ |
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attacks (XSS).\n\n" |
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return 2 |
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elif echo "$value" | grep -q 'unsafe-inline'; then |
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echo "Content-Security-Policy" | drawInBox |
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wecho -e "The content security policy includes the \ |
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${ORANGE}unsafe-inline${NC} property which allows for inline JS/CSS assets. \ |
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This prevents the content security policy from effectively mitigating against |
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reflected or stored XSS attacks\n\n" |
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elif echo "$value" | grep -q 'unsafe-eval'; then |
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echo "Content-Security-Policy" | drawInBox |
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wecho -e "The content security policy includes the \ |
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${ORANGE}unsafe-eval${NC} property which allows for eval to be used in JS. \ |
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This prevents the content security policy from effectively mitigating against |
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DOM based XSS attacks\n\n" |
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fi |
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return 0 |
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} |
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test_strict-transport-security(){ |
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local value="$(echo "$1" | cut -d ':' -f 2 | trimWhitespace)" |
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local ret=0 |
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local output="" |
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local maxAge="$(echo "$value" | grep -oE 'max-age=[0-9]+' | |
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grep -oE '[0-9]+')" |
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if [ "$maxAge" -lt "31536000" ]; then |
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output+="The max-age is set to a low value of ${ORANGE}$maxAge${NC}. |
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We suggest setting it to at least 31536000.\n\n" |
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ret=$((ret>1 ? ret : 1)) |
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fi |
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if ! echo "$value" | grep -q 'includeSubDomains'; then |
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output+="The ${ORANGE}includeSubdomains${NC} property was not found. \ |
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When included browsers won't connect to subdomains unless over an encrypted \ |
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channel.\n\n" |
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ret=$((ret>1 ? ret : 1)) |
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fi |
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#if ! echo "$value" | grep -q 'preload'; then |
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# output+="The preload property " |
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# ret=$((ret>1 ? ret : 1)) |
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#fi |
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if [ "$ret" -gt 0 ]; then |
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echo "Strict-Transport-Security" | drawInBox |
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wecho -e "$output" |
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fi |
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return $ret |
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} |
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test_set-cookie(){ |
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local value="$(echo "$1" | cut -d ':' -f 2- | trimWhitespace)" |
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local cookieName="$(echo "$value" | cut -d '=' -f 1)" |
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local ret=0 |
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local output="" |
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if ! echo "$value" | grep -q "HttpOnly"; then |
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echo "$value" |
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echo "$value" | grep -qi "HttpOnly" --color always |
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output+="The HttpOnly flag isn't set which means the cookie value can \ |
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be read by JavaScript. If a malicious actor manages to run JavaScript through \ |
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methods like XSS, they may be able to steal the contents of cookies\n\n" |
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ret=$((ret>1 ? ret : 1)) |
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fi |
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if ! echo "$value" | grep -qi "Secure"; then |
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output+="The Secure flag isn't set which means the cookie could be \ |
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sent over unencrypted channels\n\n" |
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ret=$((ret>1 ? ret : 1)) |
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fi |
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if ! echo "$value" | grep -q "SameSite=Strict"; then |
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output+="The SameSite flag isn't set to Strict. The SameSite flag \ |
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controls whether a cookie is sent with cross-origin requests, \ |
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providing some protection against cross-site request forgery attacks. |
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Strict means the browser sends the cookie only for same-site requests\n\n" |
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ret=$((ret>1 ? ret : 1)) |
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fi |
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if [ "$ret" -gt 0 ]; then |
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echo "Set-Cookie: $cookieName" | drawInBox |
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wecho -e "$output" |
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fi |
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return "$ret" |
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} |
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test_permissions-policy(){ |
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if [ -z "$1" ]; then |
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echo "Permissions-Policy" | drawInBox |
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wecho "The Permission-Policy header replaces the Feature-Policy and is \ |
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used to allow or disallow certain browser features or apis in the interest of \ |
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security.\n\n" |
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return 2 |
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fi |
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local value="$(echo "$1" | cut -d ':' -f 2- | trimWhitespace)" |
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} |
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test_feature-policy(){ |
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if [ -z "$1" ]; then |
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echo "Feature-Policy" | drawInBox |
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wecho "The Feature-Policy header was used to allow or disallow certian \ |
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browser features or apis. It has been superceded by the permissions-policy |
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header but should still be included for legacy browsers.\n\n" |
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return 2 |
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fi |
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if ! echo "$headers" | grep -Eqi '^permissions-policy'; then |
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echo "Feature-Policy" | drawInBox |
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wecho "The Feature-Policy header was used to allow or disallow certian \ |
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browser features or apis. It has been superceded by the permissions-policy |
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header but should still be included for legacy browsers. |
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It has been highlighted because the Permissions-policy header wasn't found.\n\n" |
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return 2 |
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fi |
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local value="$(echo "$1" | cut -d ':' -f 2- | trimWhitespace)" |
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} |
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test_expect-ct(){ |
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local value="$(echo "$1" | cut -d ':' -f 2- | trimWhitespace)" |
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if [ -z "$1" ]; then |
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echo "Expect-CT" | drawInBox |
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wecho "When a site enables the Expect-CT header, they are requesting \ |
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that the browser check that any certificate for that site appears in public \ |
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CT logs. |
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Initially, set the header without the enforce option but with report in order \ |
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to check for potential breakages\n\n" |
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return 2 |
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elif ! echo "$value" | grep -q "enforce"; then |
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echo "Expect-CT" | drawInBox |
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wecho "The enforce directive was not found. It can be useful to omit \ |
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this whilst testing the header, but should be added once testing has finished. |
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Without the enforce directive, the browser will not refuse connections that \ |
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violate the Certificate Transparency policy. |
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The Expect-CT will likely become obsolete in June 2021. Since May 2018 new \ |
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certificates are expected to support SCTs by default. Certificates before \ |
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March 2018 were allowed to have a lifetime of 39 months, those will all be \ |
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expired in June 2021.\n\n" |
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return 1 |
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fi |
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} |
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test_referer-policy-ct(){ |
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local value="$(echo "$1" | cut -d ':' -f 2- | trimWhitespace)" |
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if [ -z "$1" ]; then |
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echo "Referrer-Policy" | drawInBox |
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wecho "The Referrer-Policy HTTP header controls how much referrer \ |
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information (sent via the Referer header) should be included with requests.\n\n" |
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return 2 |
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elif ! echo "$value" | grep -q "enforce"; then |
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# TODO: add checks for different referer policy opitons |
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return 1 |
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fi |
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} |
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usage(){ |
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echo -n "analyse-headers [OPTIONS]... URL |
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Analyse the headers of a website |
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Options: |
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-h, --help Display this help and exit |
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" |
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} |
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# Iterate over options breaking -ab into -a -b when needed and --foo=bar into |
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# --foo bar |
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optstring=h |
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unset options |
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while (($#)); do |
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case $1 in |
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# If option is of type -ab |
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-[!-]?*) |
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# Loop over each character starting with the second |
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for ((i=1; i < ${#1}; i++)); do |
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c=${1:i:1} |
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# Add current char to options |
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options+=("-$c") |
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# If option takes a required argument, and it's not the last char make |
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# the rest of the string its argument |
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if [[ $optstring = *"$c:"* && ${1:i+1} ]]; then |
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options+=("${1:i+1}") |
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break |
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fi |
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done |
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;; |
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# If option is of type --foo=bar |
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--?*=*) options+=("${1%%=*}" "${1#*=}") ;; |
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# add --endopts for -- |
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--) options+=(--endopts) ;; |
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# Otherwise, nothing special |
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*) options+=("$1") ;; |
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esac |
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shift |
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done |
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set -- "${options[@]}" |
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unset options |
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followRedirect="false" |
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# Read the options and set stuff |
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while [[ $1 = -?* ]]; do |
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case $1 in |
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-h|--help) usage; exit;; |
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--) shift; break ;; |
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*) die "invalid option: '$1'." ;; |
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esac |
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shift |
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done |
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# Store the remaining part as arguments. |
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args+=("$@") |
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url="${args[0]}" |
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[ -z "$url" ] && die "You need to specify a url" |
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# If url is -, read headers from stdin |
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if [ "$url" = "-" ]; then |
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headers="$(cat -)" |
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else |
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headers="$(curl -s -I "$url")" |
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fi |
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missingHeaders="x-frame-options |
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content-security-policy |
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x-xss-protection |
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x-content-type-options |
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feature-policy |
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permissions-policy |
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expect-ct" |
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tmpfile="$(mktemp)" |
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touch "$tmpfile" |
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printKey |
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echo "" |
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echo "$headers" | sed -n '1p' |
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while read line; do |
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headerKey="$(echo "$line" | cut -d ':' -f1)" |
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lowercase="$(echo "$headerKey" | tr '[A-Z]' '[a-z]')" |
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missingHeaders="$(echo -n "$missingHeaders" | sed '/'"$lowercase"'/d')" |
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functionName="test_$lowercase" |
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if declare -f "$functionName" > /dev/null; then |
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"$functionName" "$line" >> "$tmpfile" |
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colour="$(getColour "$?")" |
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echo -e "${colour}$line${NC}" |
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elif echo "$lowercase" | grep "version" > /dev/null; then |
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# if the word version is in the line, assume version disclosure |
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generic_version_disclosure "$line" >> "$tmpfile" |
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colour="$(getColour "$?")" |
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echo -e "${colour}$line${NC}" |
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else |
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echo "$line" |
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fi |
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done<<<$(echo "$headers" | sed '1d') # We don't want the initial http banner |
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echo "$missingHeaders" | while read line; do |
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echo -e "${RED}$line${NC}" |
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functionName="test_$line" |
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"$functionName" >> "$tmpfile" |
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done |
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echo "" |
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cat "$tmpfile" |
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rm "$tmpfile" |
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