NeoFS S3 Gateway

NeoFS S3 gateway provides API compatible with Amazon S3 cloud storage service.

Installation

go get -u github.com/nspcc-dev/neofs-s3-gw

Or you can call make to build it from the cloned repository (the binary will end up in bin/neofs-s3-gw with authmate helper in bin/neofs-authmate).

Notable make targets:

dep          Check and ensure dependencies
image        Build clean docker image
dirty-image  Build dirty docker image with host-built binaries
format       Run all code formatters
lint         Run linters
version      Show current version

Or you can also use a Docker image provided for released (and occasionally unreleased) versions of gateway (:latest points to the latest stable release).

Execution

Minimalistic S3 gateway setup needs:

• NeoFS node(s) address (S3 gateway itself is not a NeoFS node) Passed via -p parameter or via S3_GW_PEERS_<N>_ADDRESS and S3_GW_PEERS_<N>_WEIGHT environment variables (gateway supports multiple NeoFS nodes with weighted load balancing).
• a wallet used to fetch key and communicate with NeoFS nodes Passed via --wallet parameter or S3_GW_WALLET environment variable.

These two commands are functionally equivalent, they run the gate with one backend node, some keys and otherwise default settings:

$ neofs-s3-gw -p 192.168.130.72:8080 --wallet wallet.json

$ S3_GW_PEERS_0_ADDRESS=192.168.130.72:8080 \
  S3_GW_WALLET=wallet.json \
  neofs-s3-gw

It's also possible to specify uri scheme (grpc or grpcs) when using -p or environment variables:

$ neofs-s3-gw -p grpc://192.168.130.72:8080 --wallet wallet.json

$ S3_GW_PEERS_0_ADDRESS=grpcs://192.168.130.72:8080 \
  S3_GW_WALLET=wallet.json \
  neofs-s3-gw

Configuration

In general, everything available as CLI parameter can also be specified via environment variables, so they're not specifically mentioned in most cases (see --help also). If you prefer a config file you can use it in yaml format.

Nodes and weights

You can specify multiple -p options to add more NeoFS nodes, this will make gateway spread requests equally among them (using weight 1 for every node):

$ neofs-s3-gw -p 192.168.130.72:8080 -p 192.168.130.71:8080

If you want some specific load distribution proportions, use weights, but they can only be specified via environment variables:

$ HTTP_GW_PEERS_0_ADDRESS=192.168.130.72:8080 HTTP_GW_PEERS_0_WEIGHT=9 \
  HTTP_GW_PEERS_1_ADDRESS=192.168.130.71:8080 HTTP_GW_PEERS_1_WEIGHT=1 neofs-s3-gw

This command will make gateway use 192.168.130.72 for 90% of requests and 192.168.130.71 for remaining 10%.

Key

Wallet (--wallet) is mandatory parameter. It is a path to wallet file. You can provide password to decrypt wallet via S3_GW_WALLET_PASSPHRASE variable or you will be asked to enter the password interactively. You also can specify account address to use from wallet using --address parameter.

Binding and TLS

Gateway binds to 0.0.0.0:8080 by default and you can change that with --listen_address option.

It can also provide TLS interface for its users, just specify paths to key and certificate files via --tls.key_file and --tls.cert_file parameters. Note that using these options makes gateway TLS-only, if you need to serve both TLS and plain text you either have to run two gateway instances or use some external redirecting solution.

Example to bind to 192.168.130.130:443 and serve TLS there (keys and nodes omitted):

$ neofs-s3-gw --listen_address 192.168.130.130:443 \
  --tls.key_file=key.pem --tls.cert_file=cert.pem

Monitoring and metrics

Pprof and Prometheus are integrated into the gateway, but not enabled by default. To enable them use --pprof and --metrics flags or HTTP_GW_PPROF/HTTP_GW_METRICS environment variables.

Yaml file

Configuration file is optional and can be used instead of environment variables/other parameters. It can be specified with --config parameter:

$ neofs-s3-gw --config your-config.yaml

Configuration file example:

listen_address: 0.0.0.0:8084

wallet:
  passphrase: 123456

logger:
  level: debug

peers:
  0:
    address: s01.neofs.devenv:8080
    weight: 1

To know nesting level of variable you need to cut off the prefix S3_GW from variable and split the rest parts by _. For example variable S3_GW_PEERS_0_WEIGHT=1 will be transformed to:

peers:
  0:
    weight: 1

If parameter doesn't support environment variable (e.g. --listen_address 0.0.0.0:8084) form it is used as is:

listen_address: 0.0.0.0:8084

NeoFS AuthMate

Authmate is a tool to create gateway AWS credentials. AWS users are authenticated with access key IDs and secrets, while NeoFS users are authenticated with key pairs. To complicate things further we have S3 gateway that usually acts on behalf of some user, but user doesn't necessarily want to give his keys to the gateway.

To solve this we use NeoFS bearer tokens that are signed by the owner (NeoFS "user") and that can implement any kind of policy for NeoFS requests allowed using this token. But tokens can't be used directly as AWS credentials, thus they're stored on NeoFS as regular objects and access key ID is just an address of this object while secret is generated randomly.

Tokens are not stored on NeoFS in plaintext, they're encrypted with a set of gateway keys. So in order for gateway to be able to successfully extract bearer token the object needs to be stored in a container available for the gateway to read and it needs to be encrypted with this gateway's key (among others potentially).

Variables

Authmate support the following variables to decrypt wallets provided by --wallet and --gate-wallet parameters respectevely:

• AUTHMATE_WALLET_PASSPHRASE
• AUTHMATE_WALLET_GATE_PASSPHRASE

If the passphrase is not specified, you will be asked to enter the password interactively:

Enter password for wallet.json > 

Generation of wallet

To generate wallets for gateways, run the following command:

$ ./neo-go wallet init -a -w wallet.json

Enter the name of the account > AccountTestName
Enter passphrase > 
Confirm passphrase > 

{
 	"version": "3.0",
 	"accounts": [
 		{
 			"address": "NhLQpDnerpviUWDF77j5qyjFgavCmasJ4p",
 			"key": "6PYUFyYpJ1JGyMrYV8NqeUFLKfpEVHsGGjCYtTDkjnKaSgYizRBZxVerte",
 			"label": "AccountTestName",
 			"contract": {
 				"script": "DCECXCsUZPwUyKHs6nAyyCvJ5s/vLwZkkVtWNC0zWzH8a9dBVuezJw==",
 				"parameters": [
 					{
 						"name": "parameter0",
 						"type": "Signature"
 					}
 				],
 				"deployed": false
 			},
 			"lock": false,
 			"isDefault": false
 		}
 	],
 	"scrypt": {
 		"n": 16384,
 		"r": 8,
 		"p": 8
 	},
 	"extra": {
 		"Tokens": null
 	}
 }

wallet successfully created, file location is wallet.json

To get public key from wallet run:

$ ./bin/neo-go wallet dump-keys -w wallet.json

NhLQpDnerpviUWDF77j5qyjFgavCmasJ4p (simple signature contract):
025c2b1464fc14c8a1ecea7032c82bc9e6cfef2f0664915b56342d335b31fc6bd7

Issuance of a secret

To issue a secret means to create a Bearer and (optionally) Session tokens and put them as an object into container on the NeoFS network. The tokens are encrypted by a set of gateway keys, so you need to pass them as well.

If a parameter container-id is not set, a new container will be created.

Creation of the bearer token is mandatory, and creation of the session token is optional. If you want to add the session token you need to add a parameter create-session-token.

Rules for bearer token can be set via param bearer-rules (json-string and file path allowed), if it is not set, it will be auto-generated with values:

{
    "version": {
        "major": 2,
        "minor": 6
    },
    "containerID": {
        "value": "%CID"
    },
    "records": [
        {
            "operation": "GET",
            "action": "ALLOW",
            "filters": [],
            "targets": [
                {
                    "role": "OTHERS",
                    "keys": []
                }
            ]
        }
    ]
}

Rules for session token can be set via param session-rules (json-string and file path allowed), default value is:

{
    "verb": "PUT",
    "wildcard": true,
    "containerID": null
}

If session-rules is set, but create-session-token is not, the session token will not be created.

Example of a command to issue a secret with custom rules for multiple gates:

$ ./neofs-authmate issue-secret --wallet wallet.json \
--peer 192.168.130.71:8080 \
--bearer-rules '{"records":[{"operation":"PUT","action":"ALLOW","filters":[],"targets":[{"role":"OTHERS","keys":[]}]}]}' \
--gate-public-key dd34f6dce9a4ce0990869ec6bd33a40e102a5798881cfe61d03a5659ceee1a64 \
--gate-public-key 20453af9d7f245ff6fdfb1260eaa411ae3be9c519a2a9bf1c98233522cbd0156 \
--create-session-token \
--session-rules '{"verb":"DELETE","wildcard":false,"containerID":{"value":"%CID"}}'

Enter password for wallet.json > 
{
  "access_key_id": "5g933dyLEkXbbAspouhPPTiyLZRg4axBW1axSPD87eVT_AiXsH4AjYy1iTJ4C1WExzjBrSobJsQFWEyKLREe5sQYM",
  "secret_access_key": "438bbd8243060e1e1c9dd4821756914a6e872ce29bf203b68f81b140ac91231c",
  "owner_private_key": "274fdd6e71fc6a6b8fe77bec500254115d66d6d17347d7db0880d2eb80afc72a"
}

Access key ID and secret access key are AWS credentials that you can use with any S3 client.

Obtainment of a secret access key

You can get a secret access key associated with access key ID by obtaining a secret stored on the NeoFS network. Here example of providing one password (for wallet.json) via env variable and other (for gate-wallet.json) interactively:

 $ AUTHMATE_WALLET_PASSPHRASE=some-pwd \
  ./neofs-authmate obtain-secret --wallet wallet.json \
 --peer 192.168.130.71:8080 \
 --gate-wallet gate-wallet.json \
 --access-key-id 5g933dyLEkXbbAspouhPPTiyLZRg4axBW1axSPD87eVT_AiXsH4AjYy1iTJ4C1WExzjBrSobJsQFWEyKLREe5sQYM

Enter password for gate-wallet.json >
{
  "secret_access_key": "438bbd8243060e1e1c9dd4821756914a6e872ce29bf203b68f81b140ac91231c"
}

AWS CLI usage

Configuration

Credentials

To configure basic settings that the AWS CLI uses to interact with the Gateway, do the following steps:

1. issue a secret with neofs-authmate tool (see [NeoFS Authmate] (#neofs-authmate))
2. execute the command

$ aws configure

after you enter this command, the AWS CLI will prompt you for four pieces of information, like in this example (replace with your own values):

AWS Access Key ID [None]: 5g933dyLEkXbbAspouhPPTiyLZRg4axBW1axSPD87eVT_AiXsH4AjYy1iTJ4C1WExzjBrSobJsQFWEyKLREe5sQYM
AWS Secret Access Key [None]: 438bbd8243060e1e1c9dd4821756914a6e872ce29bf203b68f81b140ac91231c
Default region name [None]: ru 
Default output format [none]: json 

Basic usage

NOTE: To specify IP and port of the gate, append --endpoint-url https://%IP:%PORT to your commands.

Bucket

Obtainment of a list of buckets

To view the list of the buckets in the NeoFS node, to which the gateway is connected, enter the command:

$ aws s3 ls 

Creation of a bucket

At this moment, the gateway supports only canned ACL and doesn't support the setting of location constraints.

To create a bucket, run the command:

$ aws s3api create-bucket --bucket %BUCKET_NAME --acl %ACL

where %ACL can be represented by a hex encoded value or by keywords public-read-write, private, public-read. If the parameter is not set, the default value is private.

Deletion of a bucket

To delete a bucket, execute the following command:

$ aws s3api delete-bucket --bucket %BUCKET_NAME

Object

Obtainment of a list of objects

To view the list of the objects in a bucket, run:

$ aws s3api list-objects --bucket %BUCKET_NAME 

Upload of a file

To upload the file into a bucket in the NeoFS network, run the following command:

$ aws s3api put-object --bucket %BUCKET_NAME --key %OBJECT_KEY --body  %FILEPATH

where %OBJECT_KEY is a filename of an object in NeoFS

Download of a file

To download the file from a bucket in the NeoFS Network, execute:

$ aws s3api get-object --bucket  %BUCKET_NAME --key %OBJECT_KEY

Deletion of a file

To delete the file:

$ aws s3api delete-object --bucket %BUCKET_NAME --key %FILE_NAME

S3 API supported

Reference:

• AWS S3 API Reference

Object

Method	Status
CopyObject	Supported
DeleteObject	Supported
DeleteObjects	Supported, aka DeleteMultipleObjects
GetObject	Supported
GetObjectTorrent	Unsupported, won't be
HeadObject	Supported
ListObjectParts	Unsupported
ListObjects	Supported
ListObjectsV2	Supported
PutObject	Supported (Content-MD5 option is not supported)
SelectObjectContent	Unsupported
WriteGetObjectResponse	Unsupported

ACL

Method	Status
GetObjectAcl	Unsupported
PutObjectAcl	Unsupported

Locking

Method	Status
GetObjectLegalHold	Unsupported
GetObjectLockConfiguration	Unsupported, aka GetBucketObjectLockConfig
GetObjectRetention	Unsupported
PutObjectLegalHold	Unsupported
PutObjectLockConfiguration	Unsupported, aka PutBucketObjectLockConfig
PutObjectRetention	Unsupported

Multipart

Should be supported eventually.

Method	Status
AbortMultipartUpload	Unsupported
CompleteMultipartUpload	Unsupported
CreateMultipartUpload	Unsupported, aka InitiateMultipartUpload and NewMultipartUpload
ListMultipartUploads	Unsupported
ListParts	Unsupported
UploadPart	Unsupported, aka PutObjectPart
UploadPartCopy	Unsupported, aka CopyObjectPart

Tagging

Also passed in PutObject parameters. We can support adding via PutObject and getting via GetBucketTagging, but deleting and putting can't be supported normally.

Method	Status
DeleteObjectTagging	Unsupported
GetObjectTagging	Unsupported
PutObjectTagging	Unsupported

Versioning

See also GetObject and other method parameters.

Method	Status
ListObjectVersions	Supported (null-versioning), aka ListBucketObjectVersions
RestoreObject	Unsupported

Bucket

Method	Status
CreateBucket	Supported, aka PutBucket
DeleteBucket	Supported
GetBucketLocation	Unsupported
HeadBucket	Supported
ListBuckets	Supported
PutPublicAccessBlock	Unsupported

Acceleration

Method	Status
GetBucketAccelerateConfiguration	Unsupported, aka GetBucketAccelerate
PutBucketAccelerateConfiguration	Unsupported

ACL

Method	Status
GetBucketAcl	Unsupported
PutBucketAcl	Unsupported

Analytics

Method	Status
DeleteBucketAnalyticsConfiguration	Unsupported
GetBucketAnalyticsConfiguration	Unsupported
ListBucketAnalyticsConfigurations	Unsupported
PutBucketAnalyticsConfiguration	Unsupported

Cors

Method	Status
DeleteBucketCors	Unsupported
GetBucketCors	Unsupported
PutBucketCors	Unsupported

Encryption

Method	Status
DeleteBucketEncryption	Unsupported
GetBucketEncryption	Unsupported
PutBucketEncryption	Unsupported

Inventory

Method	Status
DeleteBucketInventoryConfiguration	Unsupported
GetBucketInventoryConfiguration	Unsupported
ListBucketInventoryConfigurations	Unsupported
PutBucketInventoryConfiguration	Unsupported

Lifecycle

Method	Status
DeleteBucketLifecycle	Unsupported
GetBucketLifecycle	Unsupported
GetBucketLifecycleConfiguration	Unsupported
PutBucketLifecycle	Unsupported
PutBucketLifecycleConfiguration	Unsupported

Logging

Method	Status
GetBucketLogging	Unsupported
PutBucketLogging	Unsupported

Metrics

Method	Status
DeleteBucketMetricsConfiguration	Unsupported
GetBucketMetricsConfiguration	Unsupported
ListBucketMetricsConfigurations	Unsupported
PutBucketMetricsConfiguration	Unsupported

Notifications

Method	Status
GetBucketNotification	Unsupported
GetBucketNotificationConfiguration	Unsupported
ListenBucketNotification	Unsupported, non-standard?
PutBucketNotification	Unsupported
PutBucketNotificationConfiguration	Unsupported

Ownership controls

Method	Status
DeleteBucketOwnershipControls	Unsupported
GetBucketOwnershipControls	Unsupported
PutBucketOwnershipControls	Unsupported

Policy and replication

Method	Status
DeleteBucketPolicy	Unsupported
DeleteBucketReplication	Unsupported
DeletePublicAccessBlock	Unsupported
GetBucketPolicy	Unsupported
GetBucketPolicyStatus	Unsupported
GetBucketReplication	Unsupported
PostPolicyBucket	Unsupported, non-standard?
PutBucketPolicy	Unsupported
PutBucketReplication	Unsupported

Request payment

Method	Status
GetBucketRequestPayment	Unsupported
PutBucketRequestPayment	Unsupported

Tagging

Method	Status
DeleteBucketTagging	Unsupported
GetBucketTagging	Unsupported
PutBucketTagging	Unsupported

Tiering

Method	Status
DeleteBucketIntelligentTieringConfiguration	Unsupported
GetBucketIntelligentTieringConfiguration	Unsupported
ListBucketIntelligentTieringConfigurations	Unsupported
PutBucketIntelligentTieringConfiguration	Unsupported

Versioning

Method	Status
GetBucketVersioning	Unsupported
PutBucketVersioning	Unsupported

Website

Method	Status
DeleteBucketWebsite	Unsupported
GetBucketWebsite	Unsupported
PutBucketWebsite	Unsupported