0fdf4da0e9
NAR info files in binary caches can now have a cryptographic signature that Nix will verify before using the corresponding NAR file. To create a private/public key pair for signing and verifying a binary cache, do: $ openssl genrsa -out ./cache-key.sec 2048 $ openssl rsa -in ./cache-key.sec -pubout > ./cache-key.pub You should also come up with a symbolic name for the key, such as "cache.example.org-1". This will be used by clients to look up the public key. (It's a good idea to number keys, in case you ever need to revoke/replace one.) To create a binary cache signed with the private key: $ nix-push --dest /path/to/binary-cache --key ./cache-key.sec --key-name cache.example.org-1 The public key (cache-key.pub) should be distributed to the clients. They should have a nix.conf should contain something like: signed-binary-caches = * binary-cache-public-key-cache.example.org-1 = /path/to/cache-key.pub If all works well, then if Nix fetches something from the signed binary cache, you will see a message like: *** Downloading ‘http://cache.example.org/nar/7dppcj5sc1nda7l54rjc0g5l1hamj09j-subversion-1.7.11’ (signed by ‘cache.example.org-1’) to ‘/nix/store/7dppcj5sc1nda7l54rjc0g5l1hamj09j-subversion-1.7.11’... On the other hand, if the signature is wrong, you get a message like NAR info file `http://cache.example.org/7dppcj5sc1nda7l54rjc0g5l1hamj09j.narinfo' has an invalid signature; ignoring Signatures are implemented as a single line appended to the NAR info file, which looks like this: Signature: 1;cache.example.org-1;HQ9Xzyanq9iV...muQ== Thus the signature has 3 fields: a version (currently "1"), the ID of key, and the base64-encoded signature of the SHA-256 hash of the contents of the NAR info file up to but not including the Signature line. Issue #75.
42 lines
1 KiB
Perl
42 lines
1 KiB
Perl
package Nix::Config;
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$version = "@version@";
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$binDir = $ENV{"NIX_BIN_DIR"} || "@bindir@";
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$libexecDir = $ENV{"NIX_LIBEXEC_DIR"} || "@libexecdir@";
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$stateDir = $ENV{"NIX_STATE_DIR"} || "@localstatedir@/nix";
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$manifestDir = $ENV{"NIX_MANIFESTS_DIR"} || "@localstatedir@/nix/manifests";
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$logDir = $ENV{"NIX_LOG_DIR"} || "@localstatedir@/log/nix";
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$confDir = $ENV{"NIX_CONF_DIR"} || "@sysconfdir@/nix";
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$storeDir = $ENV{"NIX_STORE_DIR"} || "@storedir@";
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$bzip2 = "@bzip2@";
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$xz = "@xz@";
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$curl = "@curl@";
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$openssl = "@openssl@";
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$useBindings = "@perlbindings@" eq "yes";
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%config = ();
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sub readConfig {
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if (defined $ENV{'_NIX_OPTIONS'}) {
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foreach my $s (split '\n', $ENV{'_NIX_OPTIONS'}) {
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my ($n, $v) = split '=', $s, 2;
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$config{$n} = $v;
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}
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return;
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}
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my $config = "$confDir/nix.conf";
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return unless -f $config;
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open CONFIG, "<$config" or die "cannot open `$config'";
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while (<CONFIG>) {
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/^\s*([\w\-\.]+)\s*=\s*(.*)$/ or next;
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$config{$1} = $2;
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}
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close CONFIG;
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}
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return 1;
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