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NeoFS S3 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 the user doesn't necessarily want to give their 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 to use this token. However, tokens can't be used as AWS credentials directly. Thus, they're stored on NeoFS as regular objects, and an access key ID is just an address of this object while a 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 a 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).

  1. Generation of wallet
  2. Issuance of a secret
    1. CLI parameters
    2. Bearer tokens
    3. Session tokens
    4. Containers policy
  3. Obtainment of a secret
  4. Generate presigned url

Generation of wallet

To generate a wallet for a gateway, 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 is successfully created, the file location is wallet.json

To get the public key from the wallet:

$ ./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 Bearer and, optionally, Session tokens and put them as an object into a container on the NeoFS network.

CLI parameters

Required parameters:

  • --wallet is a path to a wallet .json file. You can provide a passphrase to decrypt a wallet via environment variable AUTHMATE_WALLET_PASSPHRASE, or you will be asked to enter a passphrase interactively. You can also specify an account address to use from a wallet using the --address parameter.
  • --peer is an address of a NeoFS peer to connect to
  • --gate-public-key is a public secp256r1 33-byte short key of a gate (use flags repeatedly for multiple gates). The tokens are encrypted by a set of gateway keys, so you need to pass them as well.

You can issue a secret using the parameters above only. The tool will

  1. create a new container
    1. without a friendly name
    2. with ACL 0x3c8c8cce -- all operations are forbidden for OTHERS and BEARER user groups, except for GET
    3. with policy REP 2 IN X CBF 3 SELECT 2 FROM * AS X
  2. put bearer and session tokens with default rules (details in [Bearer tokens](#Bearer tokens) and [Session tokens](#Session tokens))

E.g.:

$ neofs-s3-authmate issue-secret --wallet wallet.json \
 --peer 192.168.130.71:8080 \
 --gate-public-key 0313b1ac3a8076e155a7e797b24f0b650cccad5941ea59d7cfd51a024a8b2a06bf\
 --gate-public-key 0317585fa8274f7afdf1fc5f2a2e7bece549d5175c4e5182e37924f30229aef967
 
 Enter password for wallet.json > 
 
{
  "access_key_id": "5g933dyLEkXbbAspouhPPTiyLZRg4axBW1axSPD87eVT0AiXsH4AjYy1iTJ4C1WExzjBrSobJsQFWEyKLREe5sQYM",
  "secret_access_key": "438bbd8243060e1e1c9dd4821756914a6e872ce29bf203b68f81b140ac91231c",
  "owner_private_key": "274fdd6e71fc6a6b8fe77bec500254115d66d6d17347d7db0880d2eb80afc72a",
  "container_id":"5g933dyLEkXbbAspouhPPTiyLZRg4axBW1axSPD87eVT"
}

access_key_id and secret_access_key are AWS credentials that you can use with any S3 client.

access_key_id consists of Base58 encoded containerID(cid) and objectID(oid) stored on the NeoFS network and containing the secret. Format of access_key_id: %cid0%oid, where 0(zero) is a delimiter.

Optional parameters:

  • --container-id - you can put the tokens into an existing container, but this way is not recommended.
  • --container-friendly-name -- name of a container with tokens, by default container will not have a friendly name
  • --container-placement-policy - placement policy of auth container to put the secret into. Default value is REP 2 IN X CBF 3 SELECT 2 FROM * AS X
  • --lifetime-- lifetime of tokens. For example 50h30m (note: max time unit is an hour so to set a day you should use 24h). Default value is 720h (30 days). It will be ceil rounded to the nearest amount of epoch
  • --aws-cli-credentials - path to the aws cli credentials file, where authmate will write access_key_id and secret_access_key to

Bearer tokens

Creation of bearer tokens is mandatory.

Rules for a bearer token can be set via parameter --bearer-rules (json-string and file path allowed):

$ neofs-s3-authmate issue-secret --wallet wallet.json \
--peer 192.168.130.71:8080 \
--gate-public-key 0313b1ac3a8076e155a7e797b24f0b650cccad5941ea59d7cfd51a024a8b2a06bf \
--bearer-rules bearer-rules.json

where content of bearer-rules.json:

{
  "records": [
    {"operation": "PUT", "action": "ALLOW", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]},
    {"operation": "GET", "action": "ALLOW", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]},
    {"operation": "HEAD", "action": "ALLOW", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]},
    {"operation": "DELETE", "action": "ALLOW", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]},
    {"operation": "SEARCH", "action": "ALLOW", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]},
    {"operation": "GETRANGE", "action": "ALLOW", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]},
    {"operation": "GETRANGEHASH", "action": "ALLOW", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]}
  ]
}

Note: such rules allow all operations for all users (the same behavior when records are empty). To restrict access you MUST provide records with DENY action. That's why we recommend always place such records at the end of records (see default rules below) to prevent undesirable access violation. Since the rules are applied from top to bottom, they do not override what was previously allowed.

If bearer rules are not set, a token will be auto-generated with a value:

{
    "version": {
       "major": 2,
       "minor": 11
    },
    "containerID": {
       "value": null
    },
    "records": [
       {"operation": "GET", "action": "ALLOW", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]},

       {"operation": "GET", "action": "DENY", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]},
       {"operation": "HEAD", "action": "DENY", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]},
       {"operation": "PUT", "action": "DENY", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]},
       {"operation": "DELETE", "action": "DENY", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]},
       {"operation": "SEARCH", "action": "DENY", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]},
       {"operation": "GETRANGE", "action": "DENY", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]},
       {"operation": "GETRANGEHASH", "action": "DENY", "filters": [], "targets": [{"role": "OTHERS", "keys": []}]}
    ]
}

Session tokens

With a session token, there are 3 options:

  1. append --session-tokens parameter with your custom rules in json format (as a string or file path). E.g.:
$ neofs-s3-authmate issue-secret --wallet wallet.json \
--peer 192.168.130.71:8080 \
--gate-public-key 0313b1ac3a8076e155a7e797b24f0b650cccad5941ea59d7cfd51a024a8b2a06bf \
--session-tokens session.json

where content of session.json:

[
  {
    "verb": "PUT",
    "containerID": null
  },
  {
    "verb": "DELETE",
    "containerID": null
  },
  {
    "verb": "SETEACL",
    "containerID": null
  }
]

Available verb values: PUT, DELETE, SETEACL.

If containerID is null or omitted, then session token rule will be applied to all containers. Otherwise, specify containerID value in human-redabale format (base58 encoded string).

NB! To create buckets in NeoFS it's necessary to have session tokens with PUT and SETEACL permissions, that's why the authmate creates a SETEACL session token automatically in case when a user specified the token rule with PUT and forgot about the rule with SETEACL.

  1. append --session-tokens parameter with the value none -- no session token will be created
  2. skip the parameter, and authmate will create session tokens with default rules (the same as in session.json in example above)

Containers policy

Rules for mapping of LocationConstraint (aws spec) to PlacementPolicy (neofs spec) can be set via parameter --container-policy (json-string and file path allowed):

{
  "rep-3": "REP 3",
  "complex": "REP 1 IN X CBF 1 SELECT 1 FROM * AS X",
  "example-json-policy": "{\"replicas\":[{\"count\":3,\"selector\":\"SelASD0\"}],\"container_backup_factor\":3,\"selectors\":[{\"name\":\"SelASD0\",\"count\":3,\"filter\":\"*\"}],\"filters\":[]}"
}

Obtainment of a secret access key

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

$ AUTHMATE_WALLET_PASSPHRASE=some-pwd \
neofs-s3-authmate obtain-secret --wallet wallet.json \
--peer 192.168.130.71:8080 \
--gate-wallet gate-wallet.json \
--access-key-id 5g933dyLEkXbbAspouhPPTiyLZRg4axBW1axSPD87eVT0AiXsH4AjYy1iTJ4C1WExzjBrSobJsQFWEyKLREe5sQYM

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

Generate presigned URL

You can generate presigned url using AWS credentials from ~/.aws/credentials (you can specify profile using the --profile flag) with the following command:

$ neofs-s3-authmate generate-presigned-url --endpoint http://localhost:8084 \
  --method get --bucket presigned --object obj --lifetime 30s
  
{
  "URL": "http://localhost:8084/presigned/obj?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=6UpmiuYspPLMWfyhEKYmZQSsTGkFLS5MhQVdsda3fhz908Hw9eo9urTmaJtfvHMHUpY8SWAptk61bns2Js8f1M5tZ%2F20220615%2Fus-east-2%2Fs3%2Faws4_request&X-Amz-Date=20220615T084203Z&X-Amz-Expires=30&X-Amz-SignedHeaders=host&X-Amz-Signature=47f74d4b84566708a17dded05cce732690745f141235215104ad051e265e3c59"
}

You can also provide credential explicitly:

$ neofs-s3-authmate generate-presigned-url --endpoint http://localhost:8084 \
  --method put --bucket presigned --object obj --lifetime 12h \
  --region ru --aws-secret-access-key c2d65ef2980f03f4f495bdebedeeae760496697880d61d106bb9a4e5cd2e0607 \
  --aws-access-key-id ETaA2CadPcA7bAkLsML2PbTudXY8uRt2PDjCCwkvRv9s0FDCxWDXYc1SA1vKv8KbyCNsLY2AmAjJ92Vz5rgvsFCy

{
  "URL": "http://localhost:8084/presigned/obj?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ETaA2CadPcA7bAkLsML2PbTudXY8uRt2PDjCCwkvRv9s0FDCxWDXYc1SA1vKv8KbyCNsLY2AmAjJ92Vz5rgvsFCy%2F20220615%2Fru%2Fs3%2Faws4_request&X-Amz-Date=20220615T084455Z&X-Amz-Expires=43200&X-Amz-SignedHeaders=host&X-Amz-Signature=ac92aecc3787eeed03922ea82af082091c806f1bb58a7101602ed21369815d04"
}

AWS CLI

You can also can get the presigned URL (only for GET) using aws cli v2:

$ aws s3 --endpoint http://localhost:8084 presign s3://pregigned/obj 

http://localhost:8084/pregigned/obj?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=6UpmiuYspPLMWfyhEKYmZQSsTGkFLS5MhQVdsda3fhz908Hw9eo9urTmaJtfvHMHUpY8SWAptk61bns2Js8f1M5tZ%2F20220615%2Fus-east-2%2Fs3%2Faws4_request&X-Amz-Date=20220615T072348Z&X-Amz-Expires=3600&X-Amz-SignedHeaders=host&X-Amz-Signature=b82c13952534b1bba699a718f2d42d135c2833a1e64030d4ce0e198af46551d4