Adding encryption option to postgres s3 backup

postgres-backup-s3/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.15
+FROM webdevops/go-crond:master-alpine
 LABEL maintainer="Johannes Schickling <schickling.j@gmail.com>"
 
 ADD install.sh install.sh
@@ -19,8 +19,10 @@ ENV S3_PATH 'backup'
 ENV S3_ENDPOINT **None**
 ENV S3_S3V4 no
 ENV SCHEDULE **None**
+ENV ENCRYPTION_PASSWORD **None**
 
 ADD run.sh run.sh
 ADD backup.sh backup.sh
 
+ENTRYPOINT []
 CMD ["sh", "run.sh"]

postgres-backup-s3/README.md

@@ -57,3 +57,7 @@ An Endpoint is the URL of the entry point for an AWS web service or S3 Compitabl
 You can specify an alternate endpoint by setting `S3_ENDPOINT` environment variable like `protocol://endpoint`
 
 **Note:** S3 Compitable Storage Provider requires `S3_ENDPOINT` environment variable
+
+### Encryption
+
+You can additionally set the `ENCRYPTION_PASSWORD` environment variable like `-e ENCRYPTION_PASSWORD="superstrongpassword"` to encrypt the backup. It can be decrypted using `openssl aes-256-cbc -d -in backup.sql.gz.enc -out backup.sql.gz`.

postgres-backup-s3/backup.sh

@@ -1,7 +1,6 @@
 #! /bin/sh
 
 set -eo pipefail
-set -o pipefail
 
 if [ "${S3_ACCESS_KEY_ID}" = "**None**" ]; then
   echo "You need to set the S3_ACCESS_KEY_ID environment variable."
@@ -63,19 +62,29 @@ else
   S3_PREFIX="/${S3_PREFIX}/"
 fi
 
-
 if [ "${POSTGRES_BACKUP_ALL}" == "true" ]; then
-  echo "Creating dump of all databases from ${POSTGRES_HOST}..."
+  SRC_FILE=dump.sql.gz
+  DEST_FILE=all_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz
 
-  pg_dumpall -h $POSTGRES_HOST -p $POSTGRES_PORT -U $POSTGRES_USER | gzip > dump.sql.gz
+  echo "Creating dump of all databases from ${POSTGRES_HOST}..."
+  pg_dumpall -h $POSTGRES_HOST -p $POSTGRES_PORT -U $POSTGRES_USER | gzip > $SRC_FILE
+
+  if [ "${ENCRYPTION_PASSWORD}" != "**None**" ]; then
+    echo "Encrypting ${SRC_FILE}"
+    openssl enc -aes-256-cbc -in $SRC_FILE -out ${SRC_FILE}.enc -k $ENCRYPTION_PASSWORD
+    if [ $? != 0 ]; then
+      >&2 echo "Error encrypting ${SRC_FILE}"
+    fi
+    rm $SRC_FILE
+    SRC_FILE="${SRC_FILE}.enc"
+    DEST_FILE="${DEST_FILE}.enc"
+  fi
 
   echo "Uploading dump to $S3_BUCKET"
-
-  cat dump.sql.gz | aws $AWS_ARGS s3 cp - "s3://${S3_BUCKET}${S3_PREFIX}all_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz" || exit 2
+  cat $SRC_FILE | aws $AWS_ARGS s3 cp - "s3://${S3_BUCKET}${S3_PREFIX}${DEST_FILE}" || exit 2
 
   echo "SQL backup uploaded successfully"
-
-  rm -rf dump.sql.gz
+  rm -rf $SRC_FILE
 else
   OIFS="$IFS"
   IFS=','
@@ -83,17 +92,27 @@ else
   do
     IFS="$OIFS"
 
-    echo "Creating dump of ${DB} database from ${POSTGRES_HOST}..."
+    SRC_FILE=dump.sql.gz
+    DEST_FILE${DB}_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz
 
-    pg_dump $POSTGRES_HOST_OPTS $DB | gzip > dump.sql.gz
+    if [ "${ENCRYPTION_PASSWORD}" != "**None**" ]; then
+      echo "Encrypting ${SRC_FILE}"
+      openssl enc -aes-256-cbc -in $SRC_FILE -out ${SRC_FILE}.enc -k $ENCRYPTION_PASSWORD
+      if [ $? != 0 ]; then
+        >&2 echo "Error encrypting ${SRC_FILE}"
+      fi
+      rm $SRC_FILE
+      SRC_FILE="${SRC_FILE}.enc"
+      DEST_FILE="${DEST_FILE}.enc"
+    fi
 
-    echo "Uploading dump to $S3_BUCKET"
+    echo "Creating dump of ${DB} database from ${POSTGRES_HOST}..."
+    pg_dump $POSTGRES_HOST_OPTS $DB | gzip > $SRC_FILE
 
-    cat dump.sql.gz | aws $AWS_ARGS s3 cp - "s3://${S3_BUCKET}${S3_PREFIX}${DB}_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz" || exit 2
+    echo "Uploading dump to $S3_BUCKET"
+    cat $SRC_FILE | aws $AWS_ARGS s3 cp - "s3://${S3_BUCKET}${S3_PREFIX}${DEST_FILE}" || exit 2
 
     echo "SQL backup uploaded successfully"
-
-    rm -rf dump.sql.gz
+    rm -rf $SRC_FILE
   done
 fi
-

postgres-backup-s3/install.sh

@@ -3,21 +3,8 @@
 # exit if a command fails
 set -eo pipefail
 
-
 apk update
-
-# install pg_dump
-apk add postgresql-client
-
-# install s3 tools
-apk add aws-cli
-
-# install go-cron
-apk add curl
-curl -L https://github.com/odise/go-cron/releases/download/v0.0.6/go-cron-linux.gz | zcat > /usr/local/bin/go-cron
-chmod u+x /usr/local/bin/go-cron
-apk del curl
-
+apk add postgresql-client openssl aws-cli
 
 # cleanup
 rm -rf /var/cache/apk/*

postgres-backup-s3/run.sh

@@ -9,5 +9,6 @@ fi
 if [ "${SCHEDULE}" = "**None**" ]; then
   sh backup.sh
 else
-  exec go-cron "$SCHEDULE" /bin/sh backup.sh
+  echo -e "SHELL=/bin/sh\n${SCHEDULE} /bin/sh /backup.sh" > /etc/crontabs/root
+  exec go-crond /etc/crontabs/root
 fi