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DevOps-Bash-tools/curl_auth.sh

117 lines
3.4 KiB
Bash

#!/usr/bin/env bash
# vim:ts=4:sts=4:sw=4:et
#
# Author: Hari Sekhon
# Date: 2019-01-02 21:08:12 +0000 (Wed, 02 Jan 2019)
#
# https://github.com/harisekhon/bash-tools
#
# License: see accompanying Hari Sekhon LICENSE file
#
# If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
#
# https://www.linkedin.com/in/harisekhon
#
set -euo pipefail
[ -n "${DEBUG:-}" ] && set -x
srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# used by utils.sh usage()
# shellcheck disable=SC2034
usage_description="Runs curl with either Kerberos SpNego (if \$KRB5 is set) or
a ram file descriptor using \$PASSWORD to avoid credentials being exposed via process list or command line logging
Requires prefixing url with http:// or https:// to work on older versions of curl in order to parse hostname
for constructing the authentication string to be specific to the host as using netrc default login doesn't always work
"
# shellcheck source=lib/utils.sh
. "$srcdir/lib/utils.sh"
# used by utils.sh usage()
# shellcheck disable=SC2034
usage_args="[<curl_options>] <url>"
if [ $# -lt 1 ]; then
# shellcheck disable=SC2119
usage
fi
for x in "$@"; do
# shellcheck disable=SC2119
case "$x" in
-h|--help) usage
;;
esac
done
check_bin curl
USERNAME="${USERNAME:-$USER}"
# Only do password mechanism and netrc_contents workaround if not using Kerberos
if [ -z "${KRB5:-${KERBEROS:-}}" ]; then
if [ -z "${PASSWORD:-}" ]; then
pass
fi
# ==============================================
# option 1
# works on Mac but not on Linux, so going back to parsing the hostname and dynamic loading
# curl 7.64.1 (x86_64-apple-darwin19.0) libcurl/7.64.1 (SecureTransport) LibreSSL/2.8.3 zlib/1.2.11 nghttp2/1.39.2
# curl 7.35.0 (x86_64-pc-linux-gnu) libcurl/7.35.0 OpenSSL/1.0.1f zlib/1.2.8 libidn/1.28 librtmp/2.3
if is_curl_min_version 7.64; then
netrc_contents="default login $USERNAME password $PASSWORD"
fi
# ==============================================
# option 2
#
#hosts="$(awk '{print $1}' < ~/.ssh/known_hosts 2>/dev/null | sed 's/,.*//' | sort -u)"
# use built-in echo if availble, cat is slow with ~1000 .ssh/known_hosts
#if help echo &>/dev/null; then
# netrc_contents="$(for host in $hosts; do echo "machine $host login $USERNAME password $PASSWORD"; done)"
#else
# # slow fallback with lots of forks
# netrc_contents="$(for host in $hosts; do cat <<< "machine $host login $USERNAME password $PASSWORD"; done)"
#fi
# ==============================================
# option 3
# Instead of generating this for all known hosts above just do it for the host extracted from the args url now
if [ -z "${netrc_contents:-}" ]; then
if ! [[ "$*" =~ :// ]]; then
usage "http(s):// not specified in URL"
fi
# sed https* - because sed on Mac doesn't respect either ? or \? and otherwise I'd have to use:
#
# perl -pe 's/https?:\/\///'
#
# or else wrap
#
# if is_mac; then
# sed(){ gsed "$@" }
# fi
#
host="$(grep -Eom 1 'https?://[^:\/[:space:]]+' <<< "$*" | sed 's,https*://,,' | grep -v localhost | head -n1)"
netrc_contents="machine $host login $USERNAME password $PASSWORD"
fi
# ==============================================
fi
if [ -n "${KRB5:-${KERBEROS:-}}" ]; then
command curl -u : --negotiate "$@"
else
command curl --netrc-file <(cat <<< "$netrc_contents") "$@"
fi