diff options
Diffstat (limited to 'perl/lib/Wallet/ACL')
| -rw-r--r-- | perl/lib/Wallet/ACL/Base.pm | 28 | ||||
| -rw-r--r-- | perl/lib/Wallet/ACL/External.pm | 192 | ||||
| -rw-r--r-- | perl/lib/Wallet/ACL/Krb5.pm | 14 | ||||
| -rw-r--r-- | perl/lib/Wallet/ACL/Krb5/Regex.pm | 12 | ||||
| -rw-r--r-- | perl/lib/Wallet/ACL/LDAP/Attribute.pm | 16 | ||||
| -rw-r--r-- | perl/lib/Wallet/ACL/LDAP/Attribute/Root.pm | 123 | ||||
| -rw-r--r-- | perl/lib/Wallet/ACL/Nested.pm | 186 | ||||
| -rw-r--r-- | perl/lib/Wallet/ACL/NetDB.pm | 14 | ||||
| -rw-r--r-- | perl/lib/Wallet/ACL/NetDB/Root.pm | 15 |
9 files changed, 545 insertions, 55 deletions
diff --git a/perl/lib/Wallet/ACL/Base.pm b/perl/lib/Wallet/ACL/Base.pm index a2b07cc..235a9cb 100644 --- a/perl/lib/Wallet/ACL/Base.pm +++ b/perl/lib/Wallet/ACL/Base.pm @@ -1,6 +1,7 @@ -# Wallet::ACL::Base -- Parent class for wallet ACL verifiers. +# Wallet::ACL::Base -- Parent class for wallet ACL verifiers # # Written by Russ Allbery <eagle@eyrie.org> +# Copyright 2016 Russ Allbery <eagle@eyrie.org> # Copyright 2007, 2010, 2014 # The Board of Trustees of the Leland Stanford Junior University # @@ -11,16 +12,12 @@ ############################################################################## package Wallet::ACL::Base; -require 5.006; +use 5.008; use strict; use warnings; -use vars qw($VERSION); -# This version should be increased on any code change to this module. Always -# use two digits for the minor version with a leading zero if necessary so -# that it will sort properly. -$VERSION = '0.02'; +our $VERSION = '1.03'; ############################################################################## # Interface @@ -37,6 +34,11 @@ sub new { return $self; } +# The default name check method allows any name. +sub syntax_check { + return 1; +} + # The default check method denies all access. sub check { return 0; @@ -92,10 +94,18 @@ inherit from it. It is not used directly. Creates a new ACL verifier. The generic function provided here just creates and blesses an object. -=item check(PRINCIPAL, ACL) +=item syntax_check(PRINCIPAL, ACL) + +This method should be overridden by any child classes that want to +implement validating the name of an ACL before creation. The default +implementation allows any name for an ACL. + +=item check(PRINCIPAL, ACL, TYPE, NAME) This method should always be overridden by child classes. The default -implementation just declines all access. +implementation just declines all access. TYPE and NAME are the type and +name of the object being accessed, which may be used by some ACL schemes +or may be ignored. =item error([ERROR ...]) diff --git a/perl/lib/Wallet/ACL/External.pm b/perl/lib/Wallet/ACL/External.pm new file mode 100644 index 0000000..caed80e --- /dev/null +++ b/perl/lib/Wallet/ACL/External.pm @@ -0,0 +1,192 @@ +# Wallet::ACL::External -- Wallet external ACL verifier +# +# Copyright 2016 Russ Allbery <eagle@eyrie.org> +# +# See LICENSE for licensing terms. + +############################################################################## +# Modules and declarations +############################################################################## + +package Wallet::ACL::External; + +use 5.008; +use strict; +use warnings; + +use POSIX qw(_exit); +use Wallet::ACL::Base; +use Wallet::Config; + +our @ISA = qw(Wallet::ACL::Base); +our $VERSION = '1.03'; + +############################################################################## +# Interface +############################################################################## + +# Creates a new persistent verifier. This just checks if the configuration +# is in place. +sub new { + my $type = shift; + unless ($Wallet::Config::EXTERNAL_COMMAND) { + die "external ACL support not configured\n"; + } + my $self = {}; + bless ($self, $type); + return $self; +} + +# The most trivial ACL verifier. Returns true if the provided principal +# matches the ACL. +sub check { + my ($self, $principal, $acl, $type, $name) = @_; + unless ($principal) { + $self->error ('no principal specified'); + return; + } + my @args = ($principal, $type, $name, $acl); + my $pid = open (EXTERNAL, '-|'); + if (not defined $pid) { + $self->error ("cannot fork: $!"); + return; + } elsif ($pid == 0) { + unless (open (STDERR, '>&STDOUT')) { + warn "wallet: cannot dup stdout: $!\n"; + _exit(1); + } + unless (exec ($Wallet::Config::EXTERNAL_COMMAND, @args)) { + warn "wallet: cannot run $Wallet::Config::EXTERNAL_COMMAND: $!\n"; + _exit(1); + } + } + local $_; + my @output = <EXTERNAL>; + close EXTERNAL; + if ($? == 0) { + return 1; + } else { + if (@output) { + $self->error ($output[0]); + return; + } else { + return 0; + } + } +} + +1; +__END__ + +############################################################################## +# Documentation +############################################################################## + +=for stopwords +ACL Allbery verifier remctl + +=head1 NAME + +Wallet::ACL::External - Wallet ACL verifier using an external command + +=head1 SYNOPSIS + + my $verifier = Wallet::ACL::External->new; + my $status = $verifier->check ($principal, $acl); + if (not defined $status) { + die "Something failed: ", $verifier->error, "\n"; + } elsif ($status) { + print "Access granted\n"; + } else { + print "Access denied\n"; + } + +=head1 DESCRIPTION + +Wallet::ACL::External runs an external command to determine whether access is +granted. The command configured via $EXTERNAL_COMMAND in L<Wallet::Config> +will be run. The first argument to the command will be the principal +requesting access. The identifier of the ACL will be split on whitespace and +passed in as the remaining arguments to this command. + +No other arguments are passed to the command, but the command will have access +to all of the remctl environment variables seen by the wallet server (such as +REMOTE_USER). For a full list of environment variables, see +L<remctld(8)/ENVIRONMENT>. + +The external command should exit with a non-zero status but no output to +indicate a normal failure to satisfy the ACL. Any output will be treated as +an error. + +=head1 METHODS + +=over 4 + +=item new() + +Creates a new ACL verifier. For this verifier, this just confirms that +the wallet configuration sets an external command. + +=item check(PRINCIPAL, ACL, TYPE, NAME) + +Returns true if the external command returns success when run with that +PRINCIPAL, object TYPE and NAME, and ACL. So, for example, the ACL C<external +mdbset shell> will, when triggered by a request from rra@EXAMPLE.COM for the +object C<file password>, result in the command: + + $Wallet::Config::EXTERNAL_COMMAND rra@EXAMPLE.COM file password \ + 'mdbset shell' + +=item error() + +Returns the error if check() returned undef. + +=back + +=head1 DIAGNOSTICS + +The new() method may fail with one of the following exceptions: + +=over 4 + +=item external ACL support not configured + +The required configuration parameters were not set. See L<Wallet::Config> +for the required configuration parameters and how to set them. + +=back + +Verifying an external ACL may fail with the following errors (returned by +the error() method): + +=over 4 + +=item cannot fork: %s + +The attempt to fork in order to execute the external ACL verifier +command failed, probably due to a lack of system resources. + +=item no principal specified + +The PRINCIPAL parameter to check() was undefined or the empty string. + +=back + +In addition, if the external command fails and produces some output, +that will be considered a failure and the first line of its output will +be returned as the error message. The external command should exit +with a non-zero status but no error to indicate a normal failure. + +=head1 SEE ALSO + +remctld(8), Wallet::ACL(3), Wallet::ACL::Base(3), Wallet::Config(3), +wallet-backend(8) + +This module is part of the wallet system. The current version is +available from L<http://www.eyrie.org/~eagle/software/wallet/>. + +=head1 AUTHOR + +Russ Allbery <eagle@eyrie.org> + +=cut diff --git a/perl/lib/Wallet/ACL/Krb5.pm b/perl/lib/Wallet/ACL/Krb5.pm index 80d32bd..e0e9a61 100644 --- a/perl/lib/Wallet/ACL/Krb5.pm +++ b/perl/lib/Wallet/ACL/Krb5.pm @@ -1,6 +1,7 @@ -# Wallet::ACL::Krb5 -- Wallet Kerberos v5 principal ACL verifier. +# Wallet::ACL::Krb5 -- Wallet Kerberos v5 principal ACL verifier # # Written by Russ Allbery <eagle@eyrie.org> +# Copyright 2016 Russ Allbery <eagle@eyrie.org> # Copyright 2007, 2010, 2014 # The Board of Trustees of the Leland Stanford Junior University # @@ -11,20 +12,15 @@ ############################################################################## package Wallet::ACL::Krb5; -require 5.006; +use 5.008; use strict; use warnings; -use vars qw(@ISA $VERSION); use Wallet::ACL::Base; -@ISA = qw(Wallet::ACL::Base); - -# This version should be increased on any code change to this module. Always -# use two digits for the minor version with a leading zero if necessary so -# that it will sort properly. -$VERSION = '0.02'; +our @ISA = qw(Wallet::ACL::Base); +our $VERSION = '1.03'; ############################################################################## # Interface diff --git a/perl/lib/Wallet/ACL/Krb5/Regex.pm b/perl/lib/Wallet/ACL/Krb5/Regex.pm index 4934cfc..f3b9a06 100644 --- a/perl/lib/Wallet/ACL/Krb5/Regex.pm +++ b/perl/lib/Wallet/ACL/Krb5/Regex.pm @@ -1,6 +1,7 @@ # Wallet::ACL::Krb5::Regex -- Wallet Kerberos v5 principal regex ACL verifier # # Written by Russ Allbery <eagle@eyrie.org> +# Copyright 2016 Russ Allbery <eagle@eyrie.org> # Copyright 2007, 2010, 2014 # The Board of Trustees of the Leland Stanford Junior University # @@ -11,20 +12,15 @@ ############################################################################## package Wallet::ACL::Krb5::Regex; -require 5.006; +use 5.008; use strict; use warnings; -use vars qw(@ISA $VERSION); use Wallet::ACL::Krb5; -@ISA = qw(Wallet::ACL::Krb5); - -# This version should be increased on any code change to this module. Always -# use two digits for the minor version with a leading zero if necessary so -# that it will sort properly. -$VERSION = '0.01'; +our @ISA = qw(Wallet::ACL::Krb5); +our $VERSION = '1.03'; ############################################################################## # Interface diff --git a/perl/lib/Wallet/ACL/LDAP/Attribute.pm b/perl/lib/Wallet/ACL/LDAP/Attribute.pm index c27729e..fcb8447 100644 --- a/perl/lib/Wallet/ACL/LDAP/Attribute.pm +++ b/perl/lib/Wallet/ACL/LDAP/Attribute.pm @@ -1,6 +1,7 @@ -# Wallet::ACL::LDAP::Attribute -- Wallet LDAP attribute ACL verifier. +# Wallet::ACL::LDAP::Attribute -- Wallet LDAP attribute ACL verifier # # Written by Russ Allbery +# Copyright 2016 Russ Allbery <eagle@eyrie.org> # Copyright 2012, 2013, 2014 # The Board of Trustees of the Leland Stanford Junior University # @@ -11,23 +12,18 @@ ############################################################################## package Wallet::ACL::LDAP::Attribute; -require 5.006; +use 5.008; use strict; use warnings; -use vars qw(@ISA $VERSION); -use Authen::SASL (); +use Authen::SASL; use Net::LDAP qw(LDAP_COMPARE_TRUE); use Wallet::ACL::Base; use Wallet::Config; -@ISA = qw(Wallet::ACL::Base); - -# This version should be increased on any code change to this module. Always -# use two digits for the minor version with a leading zero if necessary so -# that it will sort properly. -$VERSION = '0.01'; +our @ISA = qw(Wallet::ACL::Base); +our $VERSION = '1.03'; ############################################################################## # Interface diff --git a/perl/lib/Wallet/ACL/LDAP/Attribute/Root.pm b/perl/lib/Wallet/ACL/LDAP/Attribute/Root.pm new file mode 100644 index 0000000..8451394 --- /dev/null +++ b/perl/lib/Wallet/ACL/LDAP/Attribute/Root.pm @@ -0,0 +1,123 @@ +# Wallet::ACL::LDAP::Attribute::Root -- Wallet root instance LDAP ACL verifier +# +# Written by Jon Robertson <jonrober@stanford.edu> +# Based on Wallet::ACL::NetDB::Root by Russ Allbery <eagle@eyrie.org> +# Copyright 2016 Russ Allbery <eagle@eyrie.org> +# Copyright 2015 +# The Board of Trustees of the Leland Stanford Junior University +# +# See LICENSE for licensing terms. + +############################################################################## +# Modules and declarations +############################################################################## + +package Wallet::ACL::LDAP::Attribute::Root; + +use 5.008; +use strict; +use warnings; + +use Wallet::ACL::LDAP::Attribute; + +our @ISA = qw(Wallet::ACL::LDAP::Attribute); +our $VERSION = '1.03'; + +############################################################################## +# Interface +############################################################################## + +# Override the check method of Wallet::ACL::LDAP::Attribute to require that +# the principal be a root instance and to strip /root out of the principal +# name before checking roles. +sub check { + my ($self, $principal, $acl) = @_; + undef $self->{error}; + unless ($principal) { + $self->error ('no principal specified'); + return; + } + unless ($principal =~ s%^([^/\@]+)/root(\@|\z)%$1$2%) { + return 0; + } + return $self->SUPER::check ($principal, $acl); +} + +############################################################################## +# Documentation +############################################################################## + +=for stopwords +ACL Allbery LDAP verifier + +=head1 NAME + +Wallet::ACL::LDAP::Attribute::Root - Wallet ACL verifier for LDAP attributes (root instances) + +=head1 SYNOPSIS + + my $verifier = Wallet::ACL::LDAP::Attribute::Root->new; + my $status = $verifier->check ($principal, "$attr=$value"); + if (not defined $status) { + die "Something failed: ", $verifier->error, "\n"; + } elsif ($status) { + print "Access granted\n"; + } else { + print "Access denied\n"; + } + +=head1 DESCRIPTION + +Wallet::ACL::LDAP::Attribute::Root works identically to +Wallet::ACL::LDAP::Attribute except that it requires the principal to +be a root instance (in other words, to be in the form +<principal>/root@<realm>) and strips the C</root> portion from the +principal before checking against the LDAP attribute and value. As +with the base LDAP Attribute ACL verifier, the value of such a +C<ldap-attr-root> ACL is an attribute followed by an equal sign and a +value, and the ACL grants access to a given principal if and only if +the LDAP entry for that principal (with C</root> stripped) has that +attribute set to that value. + +To use this object, the same configuration parameters must be set as for +Wallet::ACL::LDAP::Attribute. See Wallet::Config(3) for details on +those configuration parameters and information about how to set wallet +configuration. + +=head1 METHODS + +=over 4 + +=item check(PRINCIPAL, ACL) + +Returns true if PRINCIPAL is granted access according to ACL, false if +not, and undef on an error (see L<"DIAGNOSTICS"> below). ACL must be an +attribute name and a value, separated by an equal sign (with no +whitespace). PRINCIPAL will be granted access if it has an instance of +C<root> and if (with C</root> stripped off) its LDAP entry contains +that attribute with that value + +=back + +=head1 DIAGNOSTICS + +Same as for Wallet::ACL::LDAP::Attribute. + +=head1 CAVEATS + +The instance to strip is not currently configurable. + +=head1 SEE ALSO + +Net::Remctl(3), Wallet::ACL(3), Wallet::ACL::Base(3), +Wallet::ACL::LDAP::Attribute(3), Wallet::Config(3), wallet-backend(8) + +This module is part of the wallet system. The current version is +available from L<http://www.eyrie.org/~eagle/software/wallet/>. + +=head1 AUTHORS + +Jon Robertson <jonrober@stanford.edu> +Russ Allbery <eagle@eyrie.org> + +=cut diff --git a/perl/lib/Wallet/ACL/Nested.pm b/perl/lib/Wallet/ACL/Nested.pm new file mode 100644 index 0000000..da42286 --- /dev/null +++ b/perl/lib/Wallet/ACL/Nested.pm @@ -0,0 +1,186 @@ +# Wallet::ACL::Nested - ACL class for nesting ACLs +# +# Written by Jon Robertson <jonrober@stanford.edu> +# Copyright 2016 Russ Allbery <eagle@eyrie.org> +# Copyright 2015 +# The Board of Trustees of the Leland Stanford Junior University +# +# See LICENSE for licensing terms. + +############################################################################## +# Modules and declarations +############################################################################## + +package Wallet::ACL::Nested; + +use 5.008; +use strict; +use warnings; + +use Wallet::ACL::Base; + +our @ISA = qw(Wallet::ACL::Base); +our $VERSION = '1.03'; + +############################################################################## +# Interface +############################################################################## + +# Creates a new persistant verifier, taking a database handle to use for +# syntax check validation. +sub new { + my $type = shift; + my ($name, $schema) = @_; + my $self = { + schema => $schema, + expanded => {}, + }; + bless ($self, $type); + return $self; +} + +# Name checking requires checking that there's an existing ACL already by +# this name. Try to create the ACL object and use that to determine. +sub syntax_check { + my ($self, $group) = @_; + + my $acl; + eval { $acl = Wallet::ACL->new ($group, $self->{schema}) }; + return 0 if $@; + return 0 unless $acl; + return 1; +} + +# For checking a nested ACL, we need to expand each entry and then check +# that entry. We also want to keep track of things already checked in order +# to avoid any loops. +sub check { + my ($self, $principal, $group, $type, $name) = @_; + unless ($principal) { + $self->error ('no principal specified'); + return; + } + unless ($group) { + $self->error ('malformed nested ACL'); + return; + } + + # Make an ACL object just so that we can use it to drop back into the + # normal ACL validation after we have expanded the nesting. + my $acl; + eval { $acl = Wallet::ACL->new ($group, $self->{schema}) }; + + # Get the list of all nested acl entries within this entry, and use it + # to go through each entry and decide if the given acl has access. + my @members = $self->get_membership ($group); + for my $entry (@members) { + my ($scheme, $identifier) = @{ $entry }; + my $result = $acl->check_line ($principal, $scheme, $identifier, + $type, $name); + return 1 if $result; + } + return 0; +} + +# Get the membership of a group recursively. The final result will be a list +# of arrayrefs like that from Wallet::ACL->list, but expanded for full +# membership. +sub get_membership { + my ($self, $group) = @_; + + # Get the list of members for this nested acl. Consider any missing acls + # as empty. + my $schema = $self->{schema}; + my @members; + eval { + my $acl = Wallet::ACL->new ($group, $schema); + @members = $acl->list; + }; + + # Now go through and expand any other nested groups into their own + # memberships. + my @expanded; + for my $entry (@members) { + my ($type, $name) = @{ $entry }; + if ($type eq 'nested') { + + # Keep track of things we've already expanded and don't look them + # up again. + next if exists $self->{expanded}{$name}; + $self->{expanded}{$name} = 1; + push (@expanded, $self->get_membership ($name)); + + } else { + push (@expanded, $entry); + } + } + + return @expanded; +} + +1; +__END__ + +############################################################################## +# Documentation +############################################################################## + +=for stopwords +ACL Allbery verifier verifiers + +=head1 NAME + +Wallet::ACL::Nested - Wallet ACL verifier to check another ACL + +=head1 SYNOPSIS + + my $verifier = Wallet::ACL::Nested->new; + my $status = $verifier->check ($principal, $acl); + if (not defined $status) { + die "Something failed: ", $verifier->error, "\n"; + } elsif ($status) { + print "Access granted\n"; + } else { + print "Access denied\n"; + } + +=head1 DESCRIPTION + +Wallet::ACL::Nested checks whether the principal is permitted by another +named ACL and, if so, returns success. It is used to nest one ACL inside +another. + +=head1 METHODS + +=over 4 + +=item new() + +Creates a new ACL verifier. + +=item check(PRINCIPAL, ACL) + +Returns true if PRINCIPAL is granted access according to the nested ACL, +specified by name. Returns false if it is not, and undef on error. + +=item error([ERROR ...]) + +Returns the error of the last failing operation or undef if no operations +have failed. Callers should call this function to get the error message +after an undef return from any other instance method. The returned errors +will generally come from the nested child ACL. + +=back + +=head1 SEE ALSO + +Wallet::ACL(3), wallet-backend(8) + +This module is part of the wallet system. The current version is +available from L<http://www.eyrie.org/~eagle/software/wallet/>. + +=head1 AUTHOR + +Jon Robertson <jonrober@stanford.edu> + +=cut diff --git a/perl/lib/Wallet/ACL/NetDB.pm b/perl/lib/Wallet/ACL/NetDB.pm index ad2164b..a4c7fb0 100644 --- a/perl/lib/Wallet/ACL/NetDB.pm +++ b/perl/lib/Wallet/ACL/NetDB.pm @@ -1,6 +1,7 @@ -# Wallet::ACL::NetDB -- Wallet NetDB role ACL verifier. +# Wallet::ACL::NetDB -- Wallet NetDB role ACL verifier # # Written by Russ Allbery <eagle@eyrie.org> +# Copyright 2016 Russ Allbery <eagle@eyrie.org> # Copyright 2007, 2010, 2014 # The Board of Trustees of the Leland Stanford Junior University # @@ -11,21 +12,16 @@ ############################################################################## package Wallet::ACL::NetDB; -require 5.006; +use 5.008; use strict; use warnings; -use vars qw(@ISA $VERSION); use Wallet::ACL::Base; use Wallet::Config; -@ISA = qw(Wallet::ACL::Base); - -# This version should be increased on any code change to this module. Always -# use two digits for the minor version with a leading zero if necessary so -# that it will sort properly. -$VERSION = '0.05'; +our @ISA = qw(Wallet::ACL::Base); +our $VERSION = '1.03'; ############################################################################## # Interface diff --git a/perl/lib/Wallet/ACL/NetDB/Root.pm b/perl/lib/Wallet/ACL/NetDB/Root.pm index 34163e7..bfd13b4 100644 --- a/perl/lib/Wallet/ACL/NetDB/Root.pm +++ b/perl/lib/Wallet/ACL/NetDB/Root.pm @@ -1,6 +1,7 @@ -# Wallet::ACL::NetDB::Root -- Wallet NetDB role ACL verifier (root instances). +# Wallet::ACL::NetDB::Root -- Wallet NetDB role ACL verifier (root instances) # # Written by Russ Allbery <eagle@eyrie.org> +# Copyright 2016 Russ Allbery <eagle@eyrie.org> # Copyright 2007, 2010, 2014 # The Board of Trustees of the Leland Stanford Junior University # @@ -11,21 +12,15 @@ ############################################################################## package Wallet::ACL::NetDB::Root; -require 5.006; +use 5.008; use strict; use warnings; -use vars qw(@ISA $VERSION); use Wallet::ACL::NetDB; -use Wallet::Config; -@ISA = qw(Wallet::ACL::NetDB); - -# This version should be increased on any code change to this module. Always -# use two digits for the minor version with a leading zero if necessary so -# that it will sort properly. -$VERSION = '0.02'; +our @ISA = qw(Wallet::ACL::NetDB); +our $VERSION = '1.03'; ############################################################################## # Interface |