Script to get SSL cert's dates from URLs
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#!/bin/sh
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#
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# Purpose {{{
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# This script will display SSL dates of a given URL
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# 1. …
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# …
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#
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# 2021-12-06
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# }}}
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# Vars {{{
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readonly PROGNAME=$(basename "${0}")
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readonly PROGDIR=$(readlink -m $(dirname "${0}"))
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readonly ARGS="${*}"
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readonly NBARGS="${#}"
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[ -z "${DEBUG}" ] && DEBUG=1
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## Export DEBUG for sub-script
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export DEBUG
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# Default values for some vars
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readonly MY_VAR_XY_DEFAULT="666"
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## Colors
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readonly PURPLE='\033[1;35m'
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readonly RED='\033[0;31m'
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readonly RESET='\033[0m'
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readonly COLOR_DEBUG="${PURPLE}"
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# }}}
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usage() { # {{{
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cat <<- EOF
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usage: $PROGNAME [-d|-h] -f /urls/list/path|-u URL
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Try to get SSL's date (notBefore and notAfter) from URL(s).
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EXAMPLES :
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- Get dates for wikipedia.org's SSL cert
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${PROGNAME} --url wikipedia.org
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- Get SSL dates for all URLs of the given file
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${PROGNAME} --file /tmp/ssl.url.list
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OPTIONS :
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-d,--debug
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Enable debug messages.
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-f,--file
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Specify the file with URLs to verify.
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-h,--help
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Print this help message.
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-u,--url
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Specify the URL to verify.
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EOF
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}
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# }}}
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debug_message() { # {{{
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local_message="${1}"
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## Print message if DEBUG is enable (=0)
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_message}"
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return 0
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}
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# }}}
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error_message() { # {{{
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local_error_message="${1}"
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local_error_code="${2}"
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## Print message if DEBUG is enable (=0)
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[ "${DEBUG}" -eq "0" ] && printf '%b\n' "ERROR − ${PROGNAME} : ${RED}${local_error_message}${RESET}"
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exit "${local_error_code:=66}"
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}
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# }}}
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define_vars() { # {{{
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## If my_var_xy wasn't defined (argument) {{{
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if [ -z "${my_var_xy}" ]; then
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## Use default value
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readonly my_var_xy="${MY_VAR_XY_DEFAULT}"
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fi
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## }}}
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}
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# }}}
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is_var_defined() { # {{{
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local_var_defined="${1}"
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## Return an error by default
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return_is_var_defined="1"
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## If the length of the variable is nonzero
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if [ -n "${local_var_defined}" ]; then
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debug_message "is_var_defined − \
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Variable ${RED}is defined${COLOR_DEBUG} and not empty."
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return_is_var_defined="0"
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else
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debug_message "is_var_defined − \
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Var is ${RED}not${COLOR_DEBUG} defined or empty."
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return_is_var_defined="1"
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fi
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return "${return_is_var_defined}"
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}
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# }}}
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is_file_present() { # {{{
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local_file_present="${1}"
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## File doesn't exist by default
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return_is_file_present="1"
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### Check if the file exists
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# shellcheck disable=SC2086
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if find ${local_file_present} > /dev/null 2>&1; then
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return_is_file_present="0"
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debug_message "is_file_present − \
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The file ${RED}${local_file_present}${COLOR_DEBUG} exists."
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else
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return_is_file_present="1"
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debug_message "is_file_present − \
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The file ${RED}${local_file_present}${COLOR_DEBUG} doesn't exist."
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fi
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return "${return_is_file_present}"
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}
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# }}}
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display_url_date() { # {{{
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local_ssl_url="${1}"
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## Return an error by default
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return_display_url_date="1"
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if echo | openssl s_client -servername "${local_ssl_url}" -connect "${local_ssl_url}":443 2>/dev/null \
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| openssl x509 > /dev/null 2>&1 ; then
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debug_message "display_url_date − \
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Successfully got SSL's dates from ${RED}${local_ssl_url}${COLOR_DEBUG} URL."
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### Display SSL's dates
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echo | openssl s_client -servername "${local_ssl_url}" -connect "${local_ssl_url}":443 2>/dev/null | openssl x509 -noout -dates
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return_display_url_date="0"
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else
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debug_message "display_url_date − \
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Error with 'openssl' command for ${RED}${local_ssl_url}${COLOR_DEBUG}."
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return_display_url_date="1"
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fi
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return "${return_display_url_date}"
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}
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# }}}
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main() { # {{{
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## If script should not be executed right now {{{
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### Exit
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#is_script_ok \
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#&& exit 0
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## }}}
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## Define all vars
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define_vars
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## If an URL was given as argument {{{
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### Display the URL
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### AND Try to get SSL's dates
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### AND exit
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is_var_defined "${ssl_url}" \
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&& printf '%b\n' "Try to get SSL dates for ${RED}${ssl_url}${RESET} URL :" \
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&& display_url_date "${ssl_url}" \
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&& exit 0
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## }}}
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## If a file was given as argument {{{
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### Display the URL
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### AND Try to get SSL's dates
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### AND exit
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is_var_defined "${ssl_url_list_path}" \
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&& is_file_present "${ssl_url_list_path}" \
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&& printf '%b\n' "Try to manage URLs from ${RED}${ssl_url_list_path}${RESET} file :" \
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&& while IFS= read -r url; do
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printf '%b\n' "Try to get SSL dates for ${RED}${url}${RESET} URL :"
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display_url_date "${url}"
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done < "${ssl_url_list_path}" \
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&& exit 0
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## }}}
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## Display help message {{{
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### AND exit with error
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usage \
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&& error_message "Please use at least -f or -u argument to give a file or an URL. See help message." 1
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## }}}
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}
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# }}}
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# Manage arguments # {{{
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# This code can't be in a function due to argument management
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if [ ! "${NBARGS}" -eq "0" ]; then
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manage_arg="0"
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## If the first argument is not an option
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if ! printf -- '%s' "${1}" | grep -q -E -- "^-+";
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then
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## Print help message and exit
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printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
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printf '%b\n' "---"
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usage
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exit 1
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fi
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# Parse all options (start with a "-") one by one
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while printf -- '%s' "${1}" | grep -q -E -- "^-+"; do
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case "${1}" in
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-d|--debug ) ## debug
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DEBUG=0
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;;
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-h|--help ) ## help
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usage
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## Exit after help informations
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exit 0
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;;
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-f|--file ) ## Define ssl_url_list_path with given arg
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## Move to the next argument
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shift
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## Define var
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readonly ssl_url_list_path="${1}"
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;;
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-u|--url ) ## Define ssl_url with given arg
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## Move to the next argument
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shift
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## Define var
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readonly ssl_url="${1}"
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;;
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* ) ## unknow option
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printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
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printf '%b\n' "---"
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usage
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exit 1
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;;
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esac
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debug_message "Arguments management − \
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${RED}${1}${COLOR_DEBUG} option managed."
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## Move to the next argument
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shift
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manage_arg=$((manage_arg+1))
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done
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debug_message "Arguments management − \
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${RED}${manage_arg}${COLOR_DEBUG} argument(s) successfully managed."
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else
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debug_message "Arguments management − \
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No arguments/options to manage."
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fi
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# }}}
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main
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exit 255
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