Um script de shell compatível com POSIX que requer apenas openssl, curl e sed;
suportando o AWS Signature Versão 4, que é necessário para a região
eu-central-1 (Frankfurt) e recomendado para os outros:
link
#!/bin/sh -u
# To the extent possible under law, Viktor Szakats (vszakats.net)
# has waived all copyright and related or neighboring rights to this
# script.
# CC0 - https://creativecommons.org/publicdomain/zero/1.0/
# Upload a file to Amazon AWS S3 using Signature Version 4
#
# docs:
# https://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html
#
# requires:
# curl, openssl 1.x, GNU sed, LF EOLs in this file
fileLocal="${1:-example-local-file.ext}"
bucket="${2:-example-bucket}"
region="${3:-}"
storageClass="${4:-STANDARD}" # or 'REDUCED_REDUNDANCY'
m_openssl() {
if [ -f /usr/local/opt/[email protected]/bin/openssl ]; then
/usr/local/opt/[email protected]/bin/openssl "$@"
elif [ -f /usr/local/opt/openssl/bin/openssl ]; then
/usr/local/opt/openssl/bin/openssl "$@"
else
openssl "$@"
fi
}
m_sed() {
if which gsed > /dev/null 2>&1; then
gsed "$@"
else
sed "$@"
fi
}
awsStringSign4() {
kSecret="AWS4$1"
kDate=$(printf '%s' "$2" | m_openssl dgst -sha256 -hex -mac HMAC -macopt "key:${kSecret}" 2>/dev/null | m_sed 's/^.* //')
kRegion=$(printf '%s' "$3" | m_openssl dgst -sha256 -hex -mac HMAC -macopt "hexkey:${kDate}" 2>/dev/null | m_sed 's/^.* //')
kService=$(printf '%s' "$4" | m_openssl dgst -sha256 -hex -mac HMAC -macopt "hexkey:${kRegion}" 2>/dev/null | m_sed 's/^.* //')
kSigning=$(printf 'aws4_request' | m_openssl dgst -sha256 -hex -mac HMAC -macopt "hexkey:${kService}" 2>/dev/null | m_sed 's/^.* //')
signedString=$(printf '%s' "$5" | m_openssl dgst -sha256 -hex -mac HMAC -macopt "hexkey:${kSigning}" 2>/dev/null | m_sed 's/^.* //')
printf '%s' "${signedString}"
}
iniGet() {
# based on: https://stackoverflow.com/questions/22550265/read-certain-key-from-certain-section-of-ini-file-sed-awk#comment34321563_22550640
printf '%s' "$(m_sed -n -E "/\[$2\]/,/\[.*\]/{/$3/s/(.*)=[ \t]*(.*)//p}" "$1")"
}
# Initialize access keys
if [ -z "${AWS_CONFIG_FILE:-}" ]; then
if [ -z "${AWS_ACCESS_KEY:-}" ]; then
echo 'AWS_CONFIG_FILE or AWS_ACCESS_KEY/AWS_SECRET_KEY envvars not set.'
exit 1
else
awsAccess="${AWS_ACCESS_KEY}"
awsSecret="${AWS_SECRET_KEY}"
awsRegion='us-east-1'
fi
else
awsProfile='default'
# Read standard aws-cli configuration file
# pointed to by the envvar AWS_CONFIG_FILE
awsAccess="$(iniGet "${AWS_CONFIG_FILE}" "${awsProfile}" 'aws_access_key_id')"
awsSecret="$(iniGet "${AWS_CONFIG_FILE}" "${awsProfile}" 'aws_secret_access_key')"
awsRegion="$(iniGet "${AWS_CONFIG_FILE}" "${awsProfile}" 'region')"
fi
# Initialize defaults
fileRemote="${fileLocal}"
if [ -z "${region}" ]; then
region="${awsRegion}"
fi
echo "Uploading" "${fileLocal}" "->" "${bucket}" "${region}" "${storageClass}"
echo "| $(uname) | $(m_openssl version) | $(m_sed --version | head -1) |"
# Initialize helper variables
httpReq='PUT'
authType='AWS4-HMAC-SHA256'
service='s3'
baseUrl=".${service}.amazonaws.com"
dateValueS=$(date -u +'%Y%m%d')
dateValueL=$(date -u +'%Y%m%dT%H%M%SZ')
if hash file 2>/dev/null; then
contentType="$(file -b --mime-type "${fileLocal}")"
else
contentType='application/octet-stream'
fi
# 0. Hash the file to be uploaded
if [ -f "${fileLocal}" ]; then
payloadHash=$(m_openssl dgst -sha256 -hex < "${fileLocal}" 2>/dev/null | m_sed 's/^.* //')
else
echo "File not found: '${fileLocal}'"
exit 1
fi
# 1. Create canonical request
# NOTE: order significant in ${headerList} and ${canonicalRequest}
headerList='content-type;host;x-amz-content-sha256;x-amz-date;x-amz-server-side-encryption;x-amz-storage-class'
canonicalRequest="\
${httpReq}
/${fileRemote}
content-type:${contentType}
host:${bucket}${baseUrl}
x-amz-content-sha256:${payloadHash}
x-amz-date:${dateValueL}
x-amz-server-side-encryption:AES256
x-amz-storage-class:${storageClass}
${headerList}
${payloadHash}"
# Hash it
canonicalRequestHash=$(printf '%s' "${canonicalRequest}" | m_openssl dgst -sha256 -hex 2>/dev/null | m_sed 's/^.* //')
# 2. Create string to sign
stringToSign="\
${authType}
${dateValueL}
${dateValueS}/${region}/${service}/aws4_request
${canonicalRequestHash}"
# 3. Sign the string
signature=$(awsStringSign4 "${awsSecret}" "${dateValueS}" "${region}" "${service}" "${stringToSign}")
# Upload
curl -s -L --proto-redir =https -X "${httpReq}" -T "${fileLocal}" \
-H "Content-Type: ${contentType}" \
-H "Host: ${bucket}${baseUrl}" \
-H "X-Amz-Content-SHA256: ${payloadHash}" \
-H "X-Amz-Date: ${dateValueL}" \
-H "X-Amz-Server-Side-Encryption: AES256" \
-H "X-Amz-Storage-Class: ${storageClass}" \
-H "Authorization: ${authType} Credential=${awsAccess}/${dateValueS}/${region}/${service}/aws4_request, SignedHeaders=${headerList}, Signature=${signature}" \
"https://${bucket}${baseUrl}/${fileRemote}"
Observe que o script ativará o servidor
Criptografia AES256 por padrão.