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96 lines
2.4 KiB
Groff
96 lines
2.4 KiB
Groff
.\" Generated by Mmark Markdown Processer - mmark.miek.nl
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.TH "COREDNS-TLS" 7 "August 2020" "CoreDNS" "CoreDNS Plugins"
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.SH "NAME"
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.PP
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\fItls\fP - allows you to configure the server certificates for the TLS and gRPC servers.
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.SH "DESCRIPTION"
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.PP
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CoreDNS supports queries that are encrypted using TLS (DNS over Transport Layer Security, RFC 7858)
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or are using gRPC (https://grpc.io/
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\[la]https://grpc.io/\[ra], not an IETF standard). Normally DNS traffic isn't encrypted at
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all (DNSSEC only signs resource records).
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.PP
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The \fItls\fP "plugin" allows you to configure the cryptographic keys that are needed for both
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DNS-over-TLS and DNS-over-gRPC. If the \fItls\fP plugin is omitted, then no encryption takes place.
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.PP
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The gRPC protobuffer is defined in \fB\fCpb/dns.proto\fR. It defines the proto as a simple wrapper for the
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wire data of a DNS message.
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.SH "SYNTAX"
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.PP
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.RS
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.nf
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tls CERT KEY [CA]
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.fi
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.RE
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.PP
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Parameter CA is optional. If not set, system CAs can be used to verify the client certificate
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.PP
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.RS
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.nf
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tls CERT KEY [CA] {
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client\_auth nocert|request|require|verify\_if\_given|require\_and\_verify
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}
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.fi
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.RE
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.PP
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If client_auth option is specified, it controls the client authentication policy.
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The option value corresponds to the ClientAuthType values of the Go tls package
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\[la]https://golang.org/pkg/crypto/tls/#ClientAuthType\[ra]: NoClientCert, RequestClientCert, RequireAnyClientCert, VerifyClientCertIfGiven, and RequireAndVerifyClientCert, respectively.
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The default is "nocert". Note that it makes no sense to specify parameter CA unless this option is
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set to verify_if_given or require_and_verify.
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.SH "EXAMPLES"
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.PP
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Start a DNS-over-TLS server that picks up incoming DNS-over-TLS queries on port 5553 and uses the
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nameservers defined in \fB\fC/etc/resolv.conf\fR to resolve the query. This proxy path uses plain old DNS.
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.PP
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.RS
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.nf
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tls://.:5553 {
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tls cert.pem key.pem ca.pem
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forward . /etc/resolv.conf
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}
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.fi
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.RE
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.PP
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Start a DNS-over-gRPC server that is similar to the previous example, but using DNS-over-gRPC for
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incoming queries.
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.PP
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.RS
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.nf
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grpc://. {
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tls cert.pem key.pem ca.pem
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forward . /etc/resolv.conf
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}
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.fi
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.RE
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.PP
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Only Knot DNS' \fB\fCkdig\fR supports DNS-over-TLS queries, no command line client supports gRPC making
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debugging these transports harder than it should be.
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.SH "ALSO SEE"
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.PP
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RFC 7858 and https://grpc.io
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\[la]https://grpc.io\[ra].
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