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56 lines
1.4 KiB
Bash
56 lines
1.4 KiB
Bash
#!/usr/bin/env bash
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# vim:ts=4:sts=4:sw=4:et
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#
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# Author: Hari Sekhon
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# Date: 2020-08-14 16:22:09 +0100 (Fri, 14 Aug 2020)
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#
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# https://github.com/harisekhon/bash-tools
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#
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# License: see accompanying Hari Sekhon LICENSE file
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#
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# 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
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#
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# https://www.linkedin.com/in/harisekhon
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#
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set -euo pipefail
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[ -n "${DEBUG:-}" ] && set -x
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srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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# shellcheck disable=SC1090
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. "$srcdir/lib/utils.sh"
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# shellcheck disable=SC2034,SC2154
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usage_description="
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Uses OpenSSL to get the sha256 hash of a certificate crt file
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Useful to generating the hash needed for joining a Kubernetes node to a cluster eg.
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kubeadm join \\
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--token <token> \\
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--discovery-token-ca-cert-hash sha256:<hash> \\
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k8smaster:6443
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To generate this actual command on a live cluster, run the adjacent k8s_join_cmd.sh script (which uses this script)
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"
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# used by usage() in lib/utils.sh
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# shellcheck disable=SC2034
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usage_args="<file.crt>"
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help_usage "$@"
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min_args 1 "$@"
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# eg. /etc/kubernetes/pki/ca.crt
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crt_file="$1"
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if ! [ -f "$crt_file" ]; then
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die "ERROR: file not found: $crt_file"
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fi
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openssl x509 -pubkey -in "$crt_file" |
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openssl rsa -pubin -outform der 2>/dev/null |
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openssl dgst -sha256 -hex |
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sed 's/^.* //'
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