mirror of
https://github.com/coredns/coredns.git
synced 2025-10-28 08:44:17 -04:00
6676e6185d
The coredns/caddy lexer replaces invalid UTF‑8 bytes in tokens with U+FFFD. When that lossy-decoded value is used as `dbfile` in the sign plugin, the source zone file path never exists. On startup/refresh, the `resign()` function sees the signed file missing and triggers signing. Consequently `Sign()` then fails opening the bogus path, the signed file is never created, and the cycle repeats across all expanded origins (e.g., reverse CIDRs), causing unbounded churn/OOM. Validate `dbfile` in setup and error if it contains U+FFFD. Add a regression test. Note: Unicode paths are supported; only U+FFFD (replacement-rune) is rejected. Signed-off-by: Ville Vesilehto <ville@vesilehto.fi>
87 lines
2.1 KiB
Go
87 lines
2.1 KiB
Go
package sign
|
|
|
|
import (
|
|
"testing"
|
|
|
|
"github.com/coredns/caddy"
|
|
)
|
|
|
|
func TestParse(t *testing.T) {
|
|
tests := []struct {
|
|
input string
|
|
shouldErr bool
|
|
exp *Signer
|
|
}{
|
|
{`sign testdata/db.miek.nl miek.nl {
|
|
key file testdata/Kmiek.nl.+013+59725
|
|
}`,
|
|
false,
|
|
&Signer{
|
|
keys: []Pair{},
|
|
origin: "miek.nl.",
|
|
dbfile: "testdata/db.miek.nl",
|
|
directory: "/var/lib/coredns",
|
|
signedfile: "db.miek.nl.signed",
|
|
},
|
|
},
|
|
{`sign testdata/db.miek.nl example.org {
|
|
key file testdata/Kmiek.nl.+013+59725
|
|
directory testdata
|
|
}`,
|
|
false,
|
|
&Signer{
|
|
keys: []Pair{},
|
|
origin: "example.org.",
|
|
dbfile: "testdata/db.miek.nl",
|
|
directory: "testdata",
|
|
signedfile: "db.example.org.signed",
|
|
},
|
|
},
|
|
// errors
|
|
{`sign db.example.org {
|
|
key file /etc/coredns/keys/Kexample.org
|
|
}`,
|
|
true,
|
|
nil,
|
|
},
|
|
}
|
|
for i, tc := range tests {
|
|
c := caddy.NewTestController("dns", tc.input)
|
|
sign, err := parse(c)
|
|
|
|
if err == nil && tc.shouldErr {
|
|
t.Fatalf("Test %d expected errors, but got no error", i)
|
|
}
|
|
if err != nil && !tc.shouldErr {
|
|
t.Fatalf("Test %d expected no errors, but got '%v'", i, err)
|
|
}
|
|
if tc.shouldErr {
|
|
continue
|
|
}
|
|
signer := sign.signers[0]
|
|
if x := signer.origin; x != tc.exp.origin {
|
|
t.Errorf("Test %d expected %s as origin, got %s", i, tc.exp.origin, x)
|
|
}
|
|
if x := signer.dbfile; x != tc.exp.dbfile {
|
|
t.Errorf("Test %d expected %s as dbfile, got %s", i, tc.exp.dbfile, x)
|
|
}
|
|
if x := signer.directory; x != tc.exp.directory {
|
|
t.Errorf("Test %d expected %s as directory, got %s", i, tc.exp.directory, x)
|
|
}
|
|
if x := signer.signedfile; x != tc.exp.signedfile {
|
|
t.Errorf("Test %d expected %s as signedfile, got %s", i, tc.exp.signedfile, x)
|
|
}
|
|
}
|
|
}
|
|
|
|
// With setup validation in place, an invalid utf-8 dbfile token must cause parse() to error.
|
|
func TestParseRejectsInvalidDbfileToken(t *testing.T) {
|
|
input := "sign \"\xff\" 8.44.in-addr.arpa. 9.44.in-addr.arpa. {}"
|
|
c := caddy.NewTestController("dns", input)
|
|
|
|
_, err := parse(c)
|
|
if err == nil {
|
|
t.Fatalf("expected parse to fail for invalid dbfile token")
|
|
}
|
|
}
|