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Support passing standard ssh keys to age encryption (#530)

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* Support passing standard ssh keys to age encryption

* Cover SSH keys in age test case
This commit is contained in:
Frederik Ring 2025-02-07 13:43:41 +01:00 committed by GitHub
parent 2652e05169
commit cbbaa6ba7a
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GPG Key ID: B5690EEEBB952194
5 changed files with 25 additions and 4 deletions
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16
cmd/backup/encrypt_archive.go
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@ -10,8 +10,10 @@ import (
"io"
"os"
"path"
"strings"
"filippo.io/age"
"filippo.io/age/agessh"
"github.com/ProtonMail/go-crypto/openpgp/armor"
openpgp "github.com/ProtonMail/go-crypto/openpgp/v2"
"github.com/offen/docker-volume-backup/internal/errwrap"
@ -73,7 +75,7 @@ func (s *script) getConfiguredAgeRecipients() ([]age.Recipient, error) {
recipients := []age.Recipient{}
if len(s.c.AgePublicKeys) > 0 {
for _, pk := range s.c.AgePublicKeys {
pkr, err := age.ParseX25519Recipient(pk)
pkr, err := parseAgeRecipient(pk)
if err != nil {
return nil, errwrap.Wrap(err, "failed to parse age public key")
}
@ -94,6 +96,18 @@ func (s *script) getConfiguredAgeRecipients() ([]age.Recipient, error) {
return recipients, nil
}
func parseAgeRecipient(arg string) (age.Recipient, error) {
// This logic is adapted from what the age CLI is doing
// stripping some special cases
switch {
case strings.HasPrefix(arg, "age1"):
return age.ParseX25519Recipient(arg)
case strings.HasPrefix(arg, "ssh-"):
return agessh.ParseRecipient(arg)
}
return nil, fmt.Errorf("unknown recipient type: %q", arg)
}
func (s *script) encryptWithAge(rec []age.Recipient) error {
return s.doEncrypt("age", func(ciphertextWriter io.Writer) (io.WriteCloser, error) {
return age.Encrypt(ciphertextWriter, rec...)

4
docs/reference/index.md
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@ -358,8 +358,8 @@ You can populate below template according to your requirements and use it as you
# AGE_PASSPHRASE="<xxx>"
# Backups can be encrypted asymmetrically using age in case publickeys are given.
# Multiple keys need to be provided as a comma separated list. Right now, this only
# support passing age keys, with no support for ssh keys.
# Multiple keys need to be provided as a comma separated list. Right now, this
# supports `age` and `ssh` keys
# AGE_PUBLIC_KEYS="<xxx>"

1
go.mod
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@ -27,6 +27,7 @@ require (
)
require (
filippo.io/edwards25519 v1.1.0 // indirect
github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 // indirect
github.com/cloudflare/circl v1.3.7 // indirect
github.com/containerd/log v0.1.0 // indirect

2
go.sum
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@ -35,6 +35,8 @@ cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9
dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
filippo.io/age v1.2.1 h1:X0TZjehAZylOIj4DubWYU1vWQxv9bJpo+Uu2/LGhi1o=
filippo.io/age v1.2.1/go.mod h1:JL9ew2lTN+Pyft4RiNGguFfOpewKwSHm5ayKD/A4004=
filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
github.com/Azure/azure-sdk-for-go/sdk/azcore v1.17.0 h1:g0EZJwz7xkXQiZAI5xi9f3WWFYBlX1CPTrR+NDToRkQ=
github.com/Azure/azure-sdk-for-go/sdk/azcore v1.17.0/go.mod h1:XCW7KnZet0Opnr7HccfUw1PLc4CjHqpcaxW8DHklNkQ=
github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.8.1 h1:1mvYtZfWQAnwNah/C+Z+Jb9rQH95LPE2vlmMuWAHJk8=

6
test/age-publickey/run.sh
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@ -13,7 +13,10 @@ PK_A="$(grep -E 'public key' <"$LOCAL_DIR/pk-a.txt" | cut -d: -f2 | xargs)"
age-keygen >"$LOCAL_DIR/pk-b.txt"
PK_B="$(grep -E 'public key' <"$LOCAL_DIR/pk-b.txt" | cut -d: -f2 | xargs)"
export BACKUP_AGE_PUBLIC_KEYS="$PK_A,$PK_B"
ssh-keygen -t ed25519 -m pem -f "$LOCAL_DIR/id_ed25519" -C "docker-volume-backup@local"
PK_C="$(cat $LOCAL_DIR/id_ed25519.pub)"
export BACKUP_AGE_PUBLIC_KEYS="$PK_A,$PK_B,$PK_C"
docker compose up -d --quiet-pull
sleep 5
@ -41,3 +44,4 @@ do_decrypt() {
do_decrypt "$LOCAL_DIR/pk-a.txt"
do_decrypt "$LOCAL_DIR/pk-b.txt"
do_decrypt "$LOCAL_DIR/id_ed25519"