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README: add more sections based on http-gw, explain auth more

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Fixes #42.

Signed-off-by: Roman Khimov <roman@nspcc.ru>
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Roman Khimov 2021-06-10 16:29:12 +03:00
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README.md
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@ -1,82 +1,117 @@
# NeoFS S3 Gate
# NeoFS S3 Gateway
S3Gate provides API compatible with Amazon S3 cloud storage service.
NeoFS S3 gateway provides API compatible with Amazon S3 cloud storage service.
## Notable make targets
## 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:
```
Usage:
make <target>
Targets:
deps Check and ensure dependencies
format Reformat code
help Show this help prompt
image Build current docker image
publish Publish docker image
version Show current version
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
```
## Example of configuration
Or you can also use a [Docker
image](https://hub.docker.com/r/nspccdev/neofs-s3-gw) 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 key used to communicate with NeoFS nodes
Passed via `--neofs-key` parameter or `S3_GW_NEOFS-KEY` environment variable.
* a key used for client authentication
Passed via `--auth-key` parameter or `S3_GW_AUTH-KEY` environment variable.
To generate it use `neofs-authmate generate-keys` command.
These two commands are functionally equivalent, they run the gate with one
backend node, some keys and otherwise default settings:
```
# Flags
--pprof enable pprof
--metrics enable prometheus metrics
-h, --help show help
-v, --version show version
--neofs-key string set value to hex string, WIF string, or path to NeoFS private key file
--auth-key string set path to file with auth (curve25519) private key to use in auth scheme
--verbose set debug mode of gRPC connections
--request_timeout duration set gRPC request timeout (default 15s)
--connect_timeout duration set gRPC connect timeout (default 30s)
--rebalance_timer duration set gRPC connection rebalance timer (default 15s)
--max_clients_count int set max-clients count (default 100)
--max_clients_deadline duration set max-clients deadline (default 30s)
-t, --con_ttl duration set gRPC connection time to live (default 5m0s)
--listen_address string set address to listen (default "0.0.0.0:8080")
-p, --peers stringArray set NeoFS nodes
-d, --listen_domains stringArray set domains to be listened
$ neofs-s3-gw -p 192.168.130.72:8080 --neofs-key KxDgvEKzgSBPPfuVfw67oPQBSjidEiqTHURKSDL1R7yGaGYAeYnr \
--auth-key a04edd5b3c497eed83be25fb136bafd056928c17986440745775223615f2cbab
# Environments
S3_GW_AUTH-KEY =
S3_GW_NEOFS-KEY =
S3_GW_CON_TTL = 5m0s
S3_GW_CONNECT_TIMEOUT = 30s
S3_GW_REBALANCE_TIMER = 15s
S3_GW_REQUEST_TIMEOUT = 15s
S3_GW_KEEPALIVE_PERMIT_WITHOUT_STREAM = true
S3_GW_KEEPALIVE_TIME = 10s
S3_GW_KEEPALIVE_TIMEOUT = 10s
S3_GW_LISTEN_ADDRESS = 0.0.0.0:8080
S3_GW_LISTEN_DOMAINS = []
S3_GW_LOGGER_FORMAT = console
S3_GW_LOGGER_LEVEL = debug
S3_GW_LOGGER_NO_CALLER = false
S3_GW_LOGGER_NO_DISCLAIMER = true
S3_GW_LOGGER_SAMPLING_INITIAL = 1000
S3_GW_LOGGER_SAMPLING_THEREAFTER = 1000
S3_GW_LOGGER_TRACE_LEVEL = panic
S3_GW_MAX_CLIENTS_COUNT = 100
S3_GW_MAX_CLIENTS_DEADLINE = 30s
S3_GW_METRICS = false
S3_GW_PPROF = false
S3_GW_VERBOSE = false
# Peers preset
S3_GW_PEERS_[N]_ADDRESS = string
S3_GW_PEERS_[N]_WEIGHT = 0..1 (float)
$ S3_GW_PEERS_0_ADDRESS=192.168.130.72:8080 \
S3_GW_NEOFS-KEY=KxDgvEKzgSBPPfuVfw67oPQBSjidEiqTHURKSDL1R7yGaGYAeYnr \
S3_GW_AUTH-KEY=a04edd5b3c497eed83be25fb136bafd056928c17986440745775223615f2cbab \
neofs-s3-gw
```
## Reference Resources
## 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).
### 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%.
### Keys
NeoFS (`--neofs-key`) and authentication (`--auth-key`) keys are mandatory
parameters. NeoFS key can be a path to private key file (as raw bytes), a hex
string or (unencrypted) WIF string. Authentication key is either a path to
raw private key file or a hex string.
### 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.
## S3 API supported
Reference:
* [AWS S3 API Reference](https://docs.aws.amazon.com/AmazonS3/latest/API/s3-api.pdf)
### Bucket/Object-Level Actions
| # | Method Name | Status |
@ -143,9 +178,28 @@ S3_GW_PEERS_[N]_WEIGHT = 0..1 (float)
## NeoFS AuthMate
Authmate is a tool to create gateway key pairs and 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 an SHA256 hash of this key.
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).
#### Generation of key pairs
To generate key pairs for gates, run the following command:
To generate key pairs for gateways, run the following command (`--count` is 1
by default):
```
$ ./neofs-authmate generate-keys --count=2
@ -162,10 +216,14 @@ $ ./neofs-authmate generate-keys --count=2
]
```
#### Issuing of a secret
Private key is the one to use for `neofs-s3-gw` command, public one can be
used to create new AWS credentials.
To issue a secret means to create a Bearer token and put it into a container in
the NeoFS network as an object.
#### Issuance of a secret
To issue a secret means to create a Bearer token and put it as an object into
container on the NeoFS network. The token is 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.
@ -211,9 +269,13 @@ $ ./neofs-authmate issue-secret --neofs-key user.key \
}
```
#### Obtaining of a secret
Access key ID and secret access key are AWS credentials that you can use with
any S3 client.
Example of a command for obtaining of a secret stored in the NeoFS network:
#### 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:
```
$ ./neofs-authmate obtain-secret --neofs-key user.key \
@ -224,4 +286,4 @@ Example of a command for obtaining of a secret stored in the NeoFS network:
{
"secret_access_key": "438bbd8243060e1e1c9dd4821756914a6e872ce29bf203b68f81b140ac91231c"
}
```
```