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Allow RSA 2047 bit keys (#20272) (#20396) 

Backport #20272

Unfortunately it appears that 2048 bit RSA keys can occasionally be created in such
a way that they appear to have 2047 bit length. This PR simply changes our defaults to
allow these.

Fix #20249

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
This commit is contained in:
zeripath 2022-07-18 15:30:01 +01:00 committed by GitHub
parent c16f0d2a19
commit 90b4a9e929
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3 changed files with 3 additions and 3 deletions
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2
custom/conf/app.example.ini
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@ -1245,7 +1245,7 @@ ROUTER = console
;; Define allowed algorithms and their minimum key length (use -1 to disable a type)
;ED25519 = 256
;ECDSA = 256
;RSA = 2048
;RSA = 2047 ; we allow 2047 here because an otherwise valid 2048 bit RSA key can be reported as having 2047 bit length
;DSA = -1 ; set to 1024 to switch on
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

2
docs/content/doc/advanced/config-cheat-sheet.en-us.md
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@ -620,7 +620,7 @@ Define allowed algorithms and their minimum key length (use -1 to disable a type
- `ED25519`: **256**
- `ECDSA`: **256**
- `RSA`: **2048**
- `RSA`: **2047**: We set 2047 here because an otherwise valid 2048 RSA key can be reported as 2047 length.
- `DSA`: **-1**: DSA is now disabled by default. Set to **1024** to re-enable but ensure you may need to reconfigure your SSHD provider
## Webhook (`webhook`)

2
modules/setting/setting.go
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@ -170,7 +170,7 @@ var (
ServerMACs: []string{"hmac-sha2-256-etm@openssh.com", "hmac-sha2-256", "hmac-sha1"},
KeygenPath: "ssh-keygen",
MinimumKeySizeCheck: true,
MinimumKeySizes: map[string]int{"ed25519": 256, "ed25519-sk": 256, "ecdsa": 256, "ecdsa-sk": 256, "rsa": 2048},
MinimumKeySizes: map[string]int{"ed25519": 256, "ed25519-sk": 256, "ecdsa": 256, "ecdsa-sk": 256, "rsa": 2047},
ServerHostKeys: []string{"ssh/gitea.rsa", "ssh/gogs.rsa"},
AuthorizedKeysCommandTemplate: "{{.AppPath}} --config={{.CustomConf}} serv key-{{.Key.ID}}",
PerWriteTimeout: PerWriteTimeout,