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services: secret-service: Make the endpoint configurable.
Until now, the secret service had a hard-coded TCP endpoint on port 1004. This change lets users specify arbitrary socket addresses. * gnu/build/secret-service.scm (socket-address->string): New procedure, taken from Shepherd. (secret-service-send-secrets): Replace ‘port’ by ‘address’ and adjust accordingly. (secret-service-receive-secrets): Likewise. * gnu/services/virtualization.scm (secret-service-shepherd-services): Likewise. (secret-service-operating-system): Add optional ‘address’ parameter and honor it. Adjust ‘start’ method accordingly. Change-Id: I87a9514f1c170dca756ce76083d7182c6ebf6578
This commit is contained in:
Ludovic Courtès
parent
11d5b505e5
commit
f331a667d3
2 changed files with 63 additions and 39 deletions
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@ -1,5 +1,5 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2020-2022 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2020-2023 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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@ -93,13 +93,28 @@ (define (wait-for-readable-fd port timeout)
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('readable #t)
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('timeout #f)))))))
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(define* (secret-service-send-secrets port secret-root
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(define (socket-address->string address)
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"Return a human-readable representation of ADDRESS, an object as returned by
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'make-socket-address'."
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(let ((family (sockaddr:fam address)))
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(cond ((= AF_INET family)
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(string-append (inet-ntop AF_INET (sockaddr:addr address))
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":" (number->string (sockaddr:port address))))
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((= AF_INET6 family)
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(string-append "[" (inet-ntop AF_INET6 (sockaddr:addr address)) "]"
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":" (number->string (sockaddr:port address))))
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((= AF_UNIX family)
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(sockaddr:path address))
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(else
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(object->string address)))))
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(define* (secret-service-send-secrets address secret-root
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#:key (retry 60)
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(handshake-timeout 180))
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"Copy all files under SECRET-ROOT using TCP to secret-service listening at
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local PORT. If connect fails, sleep 1s and retry RETRY times; once connected,
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wait for at most HANDSHAKE-TIMEOUT seconds for handshake to complete. Return
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#f on failure."
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"Copy all files under SECRET-ROOT by connecting to secret-service listening
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at ADDRESS, an address as returned by 'make-socket-address'. If connection
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fails, sleep 1s and retry RETRY times; once connected, wait for at most
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HANDSHAKE-TIMEOUT seconds for handshake to complete. Return #f on failure."
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(define (file->file+size+mode file-name)
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(let ((stat (stat file-name))
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(target (substring file-name (string-length secret-root))))
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@ -118,9 +133,9 @@ (define (send-files sock)
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(dump-port input sock))))
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files)))
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(log "sending secrets to ~a~%" port)
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(log "sending secrets to ~a~%" (socket-address->string address))
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(let ((sock (socket AF_INET (logior SOCK_CLOEXEC SOCK_STREAM) 0))
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(addr (make-socket-address AF_INET INADDR_LOOPBACK port))
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(sleep (if (resolve-module '(fibers) #f)
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(module-ref (resolve-interface '(fibers)) 'sleep)
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sleep)))
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@ -129,7 +144,7 @@ (define (send-files sock)
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;; forward port inside the guest.
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(let loop ((retry retry))
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(catch 'system-error
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(cute connect sock addr)
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(cute connect sock address)
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(lambda (key . args)
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(when (zero? retry)
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(apply throw key args))
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@ -147,7 +162,8 @@ (define (send-files sock)
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(('secret-service-server ('version version ...))
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(log "sending files from ~s...~%" secret-root)
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(send-files sock)
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(log "done sending files to port ~a~%" port)
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(log "done sending files to ~a~%"
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(socket-address->string address))
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(close-port sock)
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secret-root)
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(x
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@ -155,7 +171,8 @@ (define (send-files sock)
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(close-port sock)
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#f))
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(begin ;timeout
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(log "timeout while sending files to ~a~%" port)
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(log "timeout while sending files to ~a~%"
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(socket-address->string address))
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(close-port sock)
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#f))))
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@ -168,19 +185,20 @@ (define (delete-file* file)
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(unless (= ENOENT (system-error-errno args))
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(apply throw args)))))
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(define (secret-service-receive-secrets port)
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"Listen to local PORT and wait for a secret service client to send secrets.
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Write them to the file system. Return the list of files installed on success,
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and #f otherwise."
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(define (secret-service-receive-secrets address)
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"Listen to ADDRESS, an address returned by 'make-socket-address', and wait
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for a secret service client to send secrets. Write them to the file system.
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Return the list of files installed on success, and #f otherwise."
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(define (wait-for-client port)
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;; Wait for a TCP connection on PORT. Note: We cannot use the
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;; virtio-serial ports, which would be safer, because they are
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;; (presumably) unsupported on GNU/Hurd.
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(define (wait-for-client address)
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;; Wait for a connection on ADDRESS. Note: virtio-serial ports are safer
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;; than TCP connections but they are (presumably) unsupported on GNU/Hurd.
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(let ((sock (socket AF_INET (logior SOCK_CLOEXEC SOCK_STREAM) 0)))
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(bind sock AF_INET INADDR_ANY port)
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(bind sock address)
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(listen sock 1)
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(log "waiting for secrets on port ~a...~%" port)
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(log "waiting for secrets on ~a...~%"
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(socket-address->string address))
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(match (select (list sock) '() '() 60)
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(((_) () ())
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(match (accept sock)
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@ -244,7 +262,7 @@ (define (read-secrets port)
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(log "invalid secrets received~%")
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#f)))
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(let* ((port (wait-for-client port))
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(let* ((port (wait-for-client address))
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(result (and=> port read-secrets)))
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(when port
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(close-port port))
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@ -996,7 +996,7 @@ (define qemu-guest-agent-service-type
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;;; Secrets for guest VMs.
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;;;
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(define (secret-service-shepherd-services port)
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(define (secret-service-shepherd-services address)
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"Return a Shepherd service that fetches sensitive material at local PORT,
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over TCP. Reboot upon failure."
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;; This is a Shepherd service, rather than an activation snippet, to make
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@ -1018,7 +1018,7 @@ (define (secret-service-shepherd-services port)
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"receiving secrets from the host...~%")
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(force-output (current-error-port))
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(let ((sent (secret-service-receive-secrets #$port)))
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(let ((sent (secret-service-receive-secrets #$address)))
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(unless sent
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(sleep 3)
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(reboot))))))
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@ -1039,9 +1039,13 @@ (define secret-service-type
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boot time. This service is meant to be used by virtual machines (VMs) that
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can only be accessed by their host.")))
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(define (secret-service-operating-system os)
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(define* (secret-service-operating-system os
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#:optional
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(address
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#~(make-socket-address
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AF_INET INADDR_ANY 1004)))
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"Return an operating system based on OS that includes the secret-service,
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that will be listening to receive secret keys on port 1004, TCP."
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that will be listening to receive secret keys on ADDRESS."
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(operating-system
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(inherit os)
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(services
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@ -1049,7 +1053,7 @@ (define (secret-service-operating-system os)
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;; activation: that requires entropy and thus takes time during boot, and
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;; those keys are going to be overwritten by secrets received from the
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;; host anyway.
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(cons (service secret-service-type 1004)
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(cons (service secret-service-type address)
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(modify-services (operating-system-user-services os)
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(openssh-service-type
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config => (openssh-configuration
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@ -1243,24 +1247,26 @@ (define vm-command
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(source-module-closure '((gnu build secret-service)
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(guix build utils)))
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#~(lambda ()
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(let ((pid (fork+exec-command #$vm-command
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#:user "childhurd"
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;; XXX TODO: use "childhurd" after
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;; updating Shepherd
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#:group "kvm"
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#:environment-variables
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;; QEMU tries to write to /var/tmp
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;; by default.
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'("TMPDIR=/tmp")))
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(port #$(hurd-vm-port config %hurd-vm-secrets-port))
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(root #$(hurd-vm-configuration-secret-root config)))
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(let* ((pid (fork+exec-command #$vm-command
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#:user "childhurd"
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;; XXX TODO: use "childhurd" after
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;; updating Shepherd
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#:group "kvm"
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#:environment-variables
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;; QEMU tries to write to /var/tmp
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;; by default.
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'("TMPDIR=/tmp")))
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(port #$(hurd-vm-port config %hurd-vm-secrets-port))
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(root #$(hurd-vm-configuration-secret-root config))
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(address (make-socket-address AF_INET INADDR_LOOPBACK
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port)))
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(catch #t
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(lambda _
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;; XXX: 'secret-service-send-secrets' won't complete until
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;; the guest has booted and its secret service server is
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;; running, which could take 20+ seconds during which PID 1
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;; is stuck waiting.
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(if (secret-service-send-secrets port root)
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(if (secret-service-send-secrets address root)
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pid
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(begin
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(kill (- pid) SIGTERM)
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