frostfs-api/proto-docs/session.md

Protocol Documentation

Table of Contents

• session/service.proto

  • Services

    • SessionService

  • Messages

    • CreateRequest
    • CreateRequest.Body
    • CreateResponse
    • CreateResponse.Body

• session/types.proto

  • Messages
    • ContainerSessionContext
    • ObjectSessionContext
    • ObjectSessionContext.Target
    • RequestMetaHeader
    • RequestVerificationHeader
    • ResponseMetaHeader
    • ResponseVerificationHeader
    • SessionToken
    • SessionToken.Body
    • SessionToken.Body.TokenLifetime
    • XHeader

• Scalar Value Types

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session/service.proto

Service "frost.fs.session.SessionService"

SessionService allows to establish a temporary trust relationship between two peer nodes and generate a SessionToken as the proof of trust to be attached in requests for further verification. Please see corresponding section of FrostFS Technical Specification for details.

rpc Create(CreateRequest) returns (CreateResponse);

Method Create

Open a new session between two peers.

Statuses:

• OK (0, SECTION_SUCCESS): session has been successfully opened;
• Common failures (SECTION_FAILURE_COMMON).

Name	Input	Output
Create	CreateRequest	CreateResponse

Message CreateRequest

Information necessary for opening a session.

Field	Type	Label	Description
body	CreateRequest.Body		Body of a create session token request message.
meta_header	RequestMetaHeader		Carries request meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	RequestVerificationHeader		Carries request verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message CreateRequest.Body

Session creation request body

Field	Type	Label	Description
owner_id	frost.fs.refs.OwnerID		Session initiating user's or node's key derived OwnerID
expiration	uint64		Session expiration Epoch

Message CreateResponse

Information about the opened session.

Field	Type	Label	Description
body	CreateResponse.Body		Body of create session token response message.
meta_header	ResponseMetaHeader		Carries response meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	ResponseVerificationHeader		Carries response verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message CreateResponse.Body

Session creation response body

Field	Type	Label	Description
id	bytes		Identifier of a newly created session
session_key	bytes		Public key used for session

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session/types.proto

Message ContainerSessionContext

Context information for Session Tokens related to ContainerService requests.

Field	Type	Label	Description
verb	ContainerSessionContext.Verb		Type of request for which the token is issued
wildcard	bool		Spreads the action to all owner containers. If set, container_id field is ignored.
container_id	frost.fs.refs.ContainerID		Particular container to which the action applies. Ignored if wildcard flag is set.

Message ObjectSessionContext

Context information for Session Tokens related to ObjectService requests

Field	Type	Label	Description
verb	ObjectSessionContext.Verb		Type of request for which the token is issued
target	ObjectSessionContext.Target		Object session target. MUST be correctly formed and set. If objects field is not empty, then the session applies only to these elements, otherwise, to all objects from the specified container.

Message ObjectSessionContext.Target

Carries objects involved in the object session.

Field	Type	Label	Description
container	frost.fs.refs.ContainerID		Indicates which container the session is spread to. Field MUST be set and correct.
objects	frost.fs.refs.ObjectID	repeated	Indicates which objects the session is spread to. Objects are expected to be stored in the FrostFS container referenced by container field. Each element MUST have correct format.

Message RequestMetaHeader

Meta information attached to the request. When forwarded between peers, request meta headers are folded in matryoshka style.

Field	Type	Label	Description
version	frost.fs.refs.Version		Peer's API version used
epoch	uint64		Peer's local epoch number. Set to 0 if unknown.
ttl	uint32		Maximum number of intermediate nodes in the request route
x_headers	XHeader	repeated	Request X-Headers
session_token	SessionToken		Session token within which the request is sent
bearer_token	frost.fs.acl.BearerToken		BearerToken with eACL overrides for the request
origin	RequestMetaHeader		RequestMetaHeader of the origin request
magic_number	uint64		FrostFS network magic. Must match the value for the network that the server belongs to.

Message RequestVerificationHeader

Verification info for the request signed by all intermediate nodes.

Field	Type	Label	Description
body_signature	frost.fs.refs.Signature		Request Body signature. Should be generated once by the request initiator.
meta_signature	frost.fs.refs.Signature		Request Meta signature is added and signed by each intermediate node
origin_signature	frost.fs.refs.Signature		Signature of previous hops
origin	RequestVerificationHeader		Chain of previous hops signatures

Message ResponseMetaHeader

Information about the response

Field	Type	Label	Description
version	frost.fs.refs.Version		Peer's API version used
epoch	uint64		Peer's local epoch number
ttl	uint32		Maximum number of intermediate nodes in the request route
x_headers	XHeader	repeated	Response X-Headers
origin	ResponseMetaHeader		ResponseMetaHeader of the origin request
status	frost.fs.status.Status		Status return

Message ResponseVerificationHeader

Verification info for the response signed by all intermediate nodes

Field	Type	Label	Description
body_signature	frost.fs.refs.Signature		Response Body signature. Should be generated once by an answering node.
meta_signature	frost.fs.refs.Signature		Response Meta signature is added and signed by each intermediate node
origin_signature	frost.fs.refs.Signature		Signature of previous hops
origin	ResponseVerificationHeader		Chain of previous hops signatures

Message SessionToken

FrostFS Session Token.

Field	Type	Label	Description
body	SessionToken.Body		Session Token contains the proof of trust between peers to be attached in requests for further verification. Please see corresponding section of FrostFS Technical Specification for details.
signature	frost.fs.refs.Signature		Signature of SessionToken information

Message SessionToken.Body

Session Token body

Field	Type	Label	Description
id	bytes		Token identifier is a valid UUIDv4 in binary form
owner_id	frost.fs.refs.OwnerID		Identifier of the session initiator
lifetime	SessionToken.Body.TokenLifetime		Lifetime of the session
session_key	bytes		Public key used in session
object	ObjectSessionContext		ObjectService session context
container	ContainerSessionContext		ContainerService session context

Message SessionToken.Body.TokenLifetime

Lifetime parameters of the token. Field names taken from rfc7519.

Field	Type	Label	Description
exp	uint64		Expiration Epoch
nbf	uint64		Not valid before Epoch
iat	uint64		Issued at Epoch

Message XHeader

Extended headers for Request/Response. They may contain any user-defined headers to be interpreted on application level.

Key name must be a unique valid UTF-8 string. Value can't be empty. Requests or Responses with duplicated header names or headers with empty values will be considered invalid.

There are some "well-known" headers starting with __SYSTEM__ prefix that affect system behaviour:

• [ __SYSTEM__NETMAP_EPOCH ]
  Netmap epoch to use for object placement calculation. The value is string encoded uint64 in decimal presentation. If set to '0' or not set, the current epoch only will be used.
• [ __SYSTEM__NETMAP_LOOKUP_DEPTH ]
  If object can't be found using current epoch's netmap, this header limits how many past epochs the node can look up through. The value is string encoded uint64 in decimal presentation. If set to '0' or not set, only the current epoch will be used.

Field	Type	Label	Description
key	string		Key of the X-Header
value	string		Value of the X-Header

ContainerSessionContext.Verb

Container request verbs

Name	Number	Description
VERB_UNSPECIFIED	0	Unknown verb
PUT	1	Refers to container.Put RPC call
DELETE	2	Refers to container.Delete RPC call
SETEACL	3	Refers to container.SetExtendedACL RPC call

ObjectSessionContext.Verb

Object request verbs

Name	Number	Description
VERB_UNSPECIFIED	0	Unknown verb
PUT	1	Refers to object.Put RPC call
GET	2	Refers to object.Get RPC call
HEAD	3	Refers to object.Head RPC call
SEARCH	4	Refers to object.Search RPC call
DELETE	5	Refers to object.Delete RPC call
RANGE	6	Refers to object.GetRange RPC call
RANGEHASH	7	Refers to object.GetRangeHash RPC call
PATCH	8	Refers to object.Patch RPC call

Scalar Value Types

.proto Type	Notes	C++ Type	Java Type	Python Type
double		double	double	float
float		float	float	float
int32	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead.	int32	int	int
int64	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead.	int64	long	int/long
uint32	Uses variable-length encoding.	uint32	int	int/long
uint64	Uses variable-length encoding.	uint64	long	int/long
sint32	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s.	int32	int	int
sint64	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s.	int64	long	int/long
fixed32	Always four bytes. More efficient than uint32 if values are often greater than 2^28.	uint32	int	int
fixed64	Always eight bytes. More efficient than uint64 if values are often greater than 2^56.	uint64	long	int/long
sfixed32	Always four bytes.	int32	int	int
sfixed64	Always eight bytes.	int64	long	int/long
bool		bool	boolean	boolean
string	A string must always contain UTF-8 encoded or 7-bit ASCII text.	string	String	str/unicode
bytes	May contain any arbitrary sequence of bytes.	string	ByteString	str