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ec3db0f56c
* signer: introduce external signer command * cmd/signer, rpc: Implement new signer. Add info about remote user to Context * signer: refactored request/response, made use of urfave.cli * cmd/signer: Use common flags * cmd/signer: methods to validate calldata against abi * cmd/signer: work on abi parser * signer: add mutex around UI * cmd/signer: add json 4byte directory, remove passwords from api * cmd/signer: minor changes * cmd/signer: Use ErrRequestDenied, enable lightkdf * cmd/signer: implement tests * cmd/signer: made possible for UI to modify tx parameters * cmd/signer: refactors, removed channels in ui comms, added UI-api via stdin/out * cmd/signer: Made lowercase json-definitions, added UI-signer test functionality * cmd/signer: update documentation * cmd/signer: fix bugs, improve abi detection, abi argument display * cmd/signer: minor change in json format * cmd/signer: rework json communication * cmd/signer: implement mixcase addresses in API, fix json id bug * cmd/signer: rename fromaccount, update pythonpoc with new json encoding format * cmd/signer: make use of new abi interface * signer: documentation * signer/main: remove redundant option * signer: implement audit logging * signer: create package 'signer', minor changes * common: add 0x-prefix to mixcaseaddress in json marshalling + validation * signer, rules, storage: implement rules + ephemeral storage for signer rules * signer: implement OnApprovedTx, change signing response (API BREAKAGE) * signer: refactoring + documentation * signer/rules: implement dispatching to next handler * signer: docs * signer/rules: hide json-conversion from users, ensure context is cleaned * signer: docs * signer: implement validation rules, change signature of call_info * signer: fix log flaw with string pointer * signer: implement custom 4byte databsae that saves submitted signatures * signer/storage: implement aes-gcm-backed credential storage * accounts: implement json unmarshalling of url * signer: fix listresponse, fix gas->uint64 * node: make http/ipc start methods public * signer: add ipc capability+review concerns * accounts: correct docstring * signer: address review concerns * rpc: go fmt -s * signer: review concerns+ baptize Clef * signer,node: move Start-functions to separate file * signer: formatting
199 lines
7.9 KiB
Markdown
199 lines
7.9 KiB
Markdown
## Initializing the signer
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First, initialize the master seed.
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```text
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#./signer init
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WARNING!
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The signer is alpha software, and not yet publically released. This software has _not_ been audited, and there
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are no guarantees about the workings of this software. It may contain severe flaws. You should not use this software
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unless you agree to take full responsibility for doing so, and know what you are doing.
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TLDR; THIS IS NOT PRODUCTION-READY SOFTWARE!
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Enter 'ok' to proceed:
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>ok
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A master seed has been generated into /home/martin/.signer/secrets.dat
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This is required to be able to store credentials, such as :
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* Passwords for keystores (used by rule engine)
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* Storage for javascript rules
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* Hash of rule-file
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You should treat that file with utmost secrecy, and make a backup of it.
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NOTE: This file does not contain your accounts. Those need to be backed up separately!
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```
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(for readability purposes, we'll remove the WARNING printout in the rest of this document)
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## Creating rules
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Now, you can create a rule-file.
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```javascript
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function ApproveListing(){
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return "Approve"
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}
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```
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Get the `sha256` hash....
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```text
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#sha256sum rules.js
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6c21d1737429d6d4f2e55146da0797782f3c0a0355227f19d702df377c165d72 rules.js
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```
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...And then `attest` the file:
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```text
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#./signer attest 6c21d1737429d6d4f2e55146da0797782f3c0a0355227f19d702df377c165d72
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INFO [02-21|12:14:38] Ruleset attestation updated sha256=6c21d1737429d6d4f2e55146da0797782f3c0a0355227f19d702df377c165d72
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```
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At this point, we then start the signer with the rule-file:
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```text
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#./signer --rules rules.json
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INFO [02-21|12:15:18] Using CLI as UI-channel
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INFO [02-21|12:15:18] Loaded 4byte db signatures=5509 file=./4byte.json
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INFO [02-21|12:15:18] Could not load rulefile, rules not enabled file=rulefile
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DEBUG[02-21|12:15:18] FS scan times list=35.335µs set=5.536µs diff=5.073µs
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DEBUG[02-21|12:15:18] Ledger support enabled
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DEBUG[02-21|12:15:18] Trezor support enabled
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INFO [02-21|12:15:18] Audit logs configured file=audit.log
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INFO [02-21|12:15:18] HTTP endpoint opened url=http://localhost:8550
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------- Signer info -------
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* extapi_http : http://localhost:8550
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* extapi_ipc : <nil>
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* extapi_version : 2.0.0
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* intapi_version : 1.2.0
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```
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Any list-requests will now be auto-approved by our rule-file.
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## Under the hood
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While doing the operations above, these files have been created:
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```text
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#ls -laR ~/.signer/
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/home/martin/.signer/:
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total 16
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drwx------ 3 martin martin 4096 feb 21 12:14 .
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drwxr-xr-x 71 martin martin 4096 feb 21 12:12 ..
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drwx------ 2 martin martin 4096 feb 21 12:14 43f73718397aa54d1b22
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-rwx------ 1 martin martin 256 feb 21 12:12 secrets.dat
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/home/martin/.signer/43f73718397aa54d1b22:
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total 12
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drwx------ 2 martin martin 4096 feb 21 12:14 .
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drwx------ 3 martin martin 4096 feb 21 12:14 ..
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-rw------- 1 martin martin 159 feb 21 12:14 config.json
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#cat /home/martin/.signer/43f73718397aa54d1b22/config.json
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{"ruleset_sha256":{"iv":"6v4W4tfJxj3zZFbl","c":"6dt5RTDiTq93yh1qDEjpsat/tsKG7cb+vr3sza26IPL2fvsQ6ZoqFx++CPUa8yy6fD9Bbq41L01ehkKHTG3pOAeqTW6zc/+t0wv3AB6xPmU="}}
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```
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In `~/.signer`, the `secrets.dat` file was created, containing the `master_seed`.
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The `master_seed` was then used to derive a few other things:
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- `vault_location` : in this case `43f73718397aa54d1b22` .
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- Thus, if you use a different `master_seed`, another `vault_location` will be used that does not conflict with each other.
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- Example: `signer --signersecret /path/to/afile ...`
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- `config.json` which is the encrypted key/value storage for configuration data, containing the key `ruleset_sha256`.
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## Adding credentials
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In order to make more useful rules; sign transactions, the signer needs access to the passwords needed to unlock keystores.
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```text
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#./signer addpw 0x694267f14675d7e1b9494fd8d72fefe1755710fa test
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INFO [02-21|13:43:21] Credential store updated key=0x694267f14675d7e1b9494fd8d72fefe1755710fa
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```
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## More advanced rules
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Now let's update the rules to make use of credentials
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```javascript
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function ApproveListing(){
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return "Approve"
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}
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function ApproveSignData(r){
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if( r.address.toLowerCase() == "0x694267f14675d7e1b9494fd8d72fefe1755710fa")
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{
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if(r.message.indexOf("bazonk") >= 0){
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return "Approve"
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}
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return "Reject"
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}
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// Otherwise goes to manual processing
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}
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```
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In this example,
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* any requests to sign data with the account `0x694...` will be
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* auto-approved if the message contains with `bazonk`,
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* and auto-rejected if it does not.
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* Any other signing-requests will be passed along for manual approve/reject.
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..attest the new file
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```text
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#sha256sum rules.js
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2a0cb661dacfc804b6e95d935d813fd17c0997a7170e4092ffbc34ca976acd9f rules.js
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#./signer attest 2a0cb661dacfc804b6e95d935d813fd17c0997a7170e4092ffbc34ca976acd9f
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INFO [02-21|14:36:30] Ruleset attestation updated sha256=2a0cb661dacfc804b6e95d935d813fd17c0997a7170e4092ffbc34ca976acd9f
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```
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And start the signer:
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```
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#./signer --rules rules.js
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INFO [02-21|14:41:56] Using CLI as UI-channel
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INFO [02-21|14:41:56] Loaded 4byte db signatures=5509 file=./4byte.json
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INFO [02-21|14:41:56] Rule engine configured file=rules.js
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DEBUG[02-21|14:41:56] FS scan times list=34.607µs set=4.509µs diff=4.87µs
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DEBUG[02-21|14:41:56] Ledger support enabled
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DEBUG[02-21|14:41:56] Trezor support enabled
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INFO [02-21|14:41:56] Audit logs configured file=audit.log
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INFO [02-21|14:41:56] HTTP endpoint opened url=http://localhost:8550
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------- Signer info -------
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* extapi_version : 2.0.0
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* intapi_version : 1.2.0
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* extapi_http : http://localhost:8550
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* extapi_ipc : <nil>
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INFO [02-21|14:41:56] error occurred during execution error="ReferenceError: 'OnSignerStartup' is not defined"
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```
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And then test signing, once with `bazonk` and once without:
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```
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#curl -H "Content-Type: application/json" -X POST --data "{\"jsonrpc\":\"2.0\",\"method\":\"account_sign\",\"params\":[\"0x694267f14675d7e1b9494fd8d72fefe1755710fa\",\"0x$(xxd -pu <<< ' bazonk baz gaz')\"],\"id\":67}" http://localhost:8550/
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{"jsonrpc":"2.0","id":67,"result":"0x93e6161840c3ae1efc26dc68dedab6e8fc233bb3fefa1b4645dbf6609b93dace160572ea4ab33240256bb6d3dadb60dcd9c515d6374d3cf614ee897408d41d541c"}
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#curl -H "Content-Type: application/json" -X POST --data "{\"jsonrpc\":\"2.0\",\"method\":\"account_sign\",\"params\":[\"0x694267f14675d7e1b9494fd8d72fefe1755710fa\",\"0x$(xxd -pu <<< ' bonk baz gaz')\"],\"id\":67}" http://localhost:8550/
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{"jsonrpc":"2.0","id":67,"error":{"code":-32000,"message":"Request denied"}}
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```
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Meanwhile, in the signer output:
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```text
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INFO [02-21|14:42:41] Op approved
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INFO [02-21|14:42:56] Op rejected
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```
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The signer also stores all traffic over the external API in a log file. The last 4 lines shows the two requests and their responses:
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```text
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#tail audit.log -n 4
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t=2018-02-21T14:42:41+0100 lvl=info msg=Sign api=signer type=request metadata="{\"remote\":\"127.0.0.1:49706\",\"local\":\"localhost:8550\",\"scheme\":\"HTTP/1.1\"}" addr="0x694267f14675d7e1b9494fd8d72fefe1755710fa [chksum INVALID]" data=202062617a6f6e6b2062617a2067617a0a
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t=2018-02-21T14:42:42+0100 lvl=info msg=Sign api=signer type=response data=93e6161840c3ae1efc26dc68dedab6e8fc233bb3fefa1b4645dbf6609b93dace160572ea4ab33240256bb6d3dadb60dcd9c515d6374d3cf614ee897408d41d541c error=nil
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t=2018-02-21T14:42:56+0100 lvl=info msg=Sign api=signer type=request metadata="{\"remote\":\"127.0.0.1:49708\",\"local\":\"localhost:8550\",\"scheme\":\"HTTP/1.1\"}" addr="0x694267f14675d7e1b9494fd8d72fefe1755710fa [chksum INVALID]" data=2020626f6e6b2062617a2067617a0a
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t=2018-02-21T14:42:56+0100 lvl=info msg=Sign api=signer type=response data= error="Request denied"
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```
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