1 | package LATMOS::Accounts::Acls; |
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2 | |
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3 | use strict; |
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4 | use warnings; |
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5 | use LATMOS::Accounts::Log; |
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6 | |
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7 | our $VERSION = (q$Rev: 330 $ =~ /^Rev: (\d+) /)[0]; |
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8 | |
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9 | sub new { |
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10 | my ($class, $file) = @_; |
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11 | my $acls = bless( |
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12 | { |
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13 | _acls => [] |
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14 | }, $class |
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15 | ); |
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16 | if ($file) { |
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17 | $acls->read_acl_file($file) or return; |
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18 | } |
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19 | $acls |
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20 | } |
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21 | |
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22 | =head1 ACL FILE FORMAT |
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23 | |
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24 | OBJ_TYPE.ATTRIBUTE |
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25 | USER: read,write |
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26 | USER2: read |
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27 | |
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28 | =over 4 |
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29 | |
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30 | =item OBJ_TYPE is the type the object, '*' match all |
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31 | |
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32 | =item ATTRIBUTE is either an attribute, either an comma separate attribute |
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33 | enclose into bracket, either a '*' to match any attribute. |
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34 | |
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35 | Special keyword C<@CREATE> and C<@DELETE> can be used to allow or deny object |
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36 | creation and deletion. In this case read permission and USER in form C<$...> for |
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37 | C<@CREATE> have no effect (see below). C<*> do not include C<@CREATE> and |
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38 | C<@DELETE> action. |
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39 | |
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40 | =item USER can be |
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41 | |
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42 | =over 4 |
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43 | |
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44 | =item a username |
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45 | |
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46 | =item group, prefixed by a '%' |
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47 | |
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48 | =item an attribute of the accessed object which should contains the username, |
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49 | prefixed by '$' |
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50 | |
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51 | =item C<*> to math any user |
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52 | |
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53 | =item @authenticated or @anonymous for any authenticated user and non |
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54 | authenticated user ('*' include both) |
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55 | |
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56 | =back |
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57 | |
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58 | =item Permission are read and or write, or deny. |
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59 | |
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60 | =back |
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61 | |
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62 | ACL are applied in the order they appear in the file. |
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63 | |
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64 | =cut |
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65 | |
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66 | sub read_acl_file { |
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67 | my ($self, $file) = @_; |
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68 | |
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69 | my $acl; |
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70 | my $line_nb = 0; |
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71 | my $prevline = ""; |
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72 | if (open(my $handle, '<', $file)) { |
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73 | while(my $realline = <$handle>) { |
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74 | $line_nb++; |
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75 | chomp($realline); |
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76 | if ($realline =~ /\\$/) { |
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77 | # continuation line |
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78 | $prevline .= $realline; |
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79 | $prevline =~ s/\s*\\$//; |
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80 | next; |
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81 | } |
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82 | my $line = $prevline . $realline; # keep track to report malformed file |
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83 | $prevline = ""; |
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84 | $line =~ s/\s*#.*//; |
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85 | if ($line =~ /^(\S.*)/) { |
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86 | if ($acl) { |
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87 | push(@{$self->{_acls}}, $acl); |
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88 | } |
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89 | $acl = LATMOS::Accounts::Acls::acl->new($1) or do { |
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90 | la_log(LA_ERR, "Error in %s at line %d", $file, |
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91 | $line_nb); |
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92 | return; |
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93 | }; |
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94 | } elsif ($line =~ /^\s+(\S.*)/) { |
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95 | if ($acl) { |
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96 | $acl->add_perm($line) or do { |
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97 | la_log(LA_ERR, "Error in %s at line %d", $file, |
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98 | $line_nb); |
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99 | return; |
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100 | }; |
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101 | } else { |
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102 | # err no acl |
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103 | return; |
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104 | } |
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105 | } elsif ($line =~ /^\s*$/) { |
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106 | # just empty line |
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107 | } else { |
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108 | } |
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109 | } |
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110 | if ($acl) { |
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111 | push(@{$self->{_acls}}, $acl); |
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112 | } |
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113 | } else { |
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114 | la_log(LA_ERR, "Cannot open acl file %s", $file); |
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115 | return; |
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116 | } |
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117 | 1; |
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118 | } |
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119 | |
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120 | sub add { |
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121 | my ($self, $obj, $list) = @_; |
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122 | my $acl = LATMOS::Accounts::Acls::acl->new( |
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123 | $obj, $list) or return; |
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124 | push(@{$self->{_acls}}, $acl); |
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125 | return 1; |
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126 | } |
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127 | |
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128 | sub check { |
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129 | my ($self, $obj, $attr, $perm, $who, $groups) = @_; |
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130 | # Asking 'r' perm over create or delete has no sense: |
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131 | $attr =~ /^@(CREATE|DELETE)$/ && $perm eq 'r' and return; |
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132 | |
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133 | foreach my $acl (@{$self->{_acls}}) { |
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134 | my $res = $acl->match($obj, $attr, $perm, $who, $groups); |
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135 | defined($res) and return $res; |
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136 | } |
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137 | return 0; |
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138 | } |
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139 | |
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140 | sub dump { |
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141 | my ($self) = @_; |
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142 | foreach my $acl (@{$self->{_acls}}) { |
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143 | print $acl->dump, "\n"; |
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144 | } |
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145 | } |
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146 | |
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147 | package LATMOS::Accounts::Acls::acl; |
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148 | use strict; |
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149 | use warnings; |
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150 | |
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151 | sub new { |
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152 | my ($class, $objdotatt, $list) = @_; |
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153 | my ($obj, $attr) = $objdotatt =~ /^([^.]+)\.(.*)/ or return; |
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154 | my @attrs = ($attr =~ /^\{(.*)\}$/) |
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155 | ? (split(/\s*,\s*/, $1)) |
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156 | : ($attr); |
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157 | @attrs or return; |
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158 | my $acl = { |
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159 | obj => lc($obj), |
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160 | attr => [ map { lc } @attrs ], |
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161 | users => [], # user->{r} = 1 |
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162 | }; |
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163 | bless($acl, $class); |
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164 | foreach my $k (@{ $list || [] }) { |
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165 | $acl->add_perm($k) or return; |
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166 | } |
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167 | $acl |
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168 | } |
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169 | |
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170 | sub add_perm { |
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171 | my ($self, $perm) = @_; |
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172 | my ($username, $perms) = $perm =~ /^\s*(\S*):\s*(.*)$/; |
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173 | $username && $perms or return; |
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174 | my $user = { user => $username }; |
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175 | foreach (split(/\s*,\s*/, $perms)) { |
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176 | /^read$/i and do { $user->{r} = 1; next; }; |
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177 | /^write$/i and do { $user->{w} = 1; next; }; |
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178 | /^deny$/i and do { |
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179 | # reseting... |
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180 | $user->{r} = 0; |
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181 | $user->{w} = 0; |
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182 | last; # we end here, life is hard |
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183 | }; |
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184 | return; |
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185 | } |
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186 | push(@{$self->{users}}, $user); |
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187 | 1 |
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188 | } |
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189 | |
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190 | sub match { |
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191 | my ($self, $obj, $attr, $perm, $who, $groups) = @_; |
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192 | my $objtype = ref $obj ? lc($obj->type) : $obj; |
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193 | $attr = lc($attr); |
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194 | |
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195 | # Does this ACL series concern this object: |
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196 | if (!($self->{obj} eq '*' || $self->{obj} eq $objtype)) { |
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197 | return |
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198 | } |
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199 | # Does this ACL series concern this attribute: |
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200 | grep { $_ eq '*' || $_ eq $attr } @{$self->{attr}} or return; |
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201 | |
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202 | # Foreach user, testing if this permission match: |
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203 | foreach my $u (@{ $self->{users} }) { |
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204 | # Obj have attr eq login user |
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205 | if (substr($u->{user}, 0, 1) eq '$') { # check attr content |
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206 | if (ref $obj) { |
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207 | my $attribute = substr($u->{user}, 1); |
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208 | my $val = $obj->_get_c_field($attribute) or return; |
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209 | my @vals = ref $val ? (@{ $val }) : ($val); |
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210 | return $u->{$perm} if (defined($u->{$perm}) && grep { $_ eq $who } @vals); |
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211 | } |
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212 | # user is in group |
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213 | } elsif (substr($u->{user}, 0, 1) eq '%') { # group |
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214 | my $group = substr($u->{user}, 1); |
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215 | return $u->{$perm} if (defined($u->{$perm}) && grep { $group eq $_ } grep { $_ } @{$groups ||[]}); |
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216 | # any user |
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217 | } elsif ($u->{user} eq '*' || $u->{user} eq $who) { |
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218 | return $u->{$perm} if (defined($u->{$perm})); |
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219 | # any authenticated user |
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220 | } elsif (lc($u->{user}) eq '@authenticated' && $who) { |
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221 | return $u->{$perm} if (defined($u->{$perm})); |
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222 | # not login |
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223 | } elsif (lc($u->{user}) eq '@anonymous' && $who eq "") { |
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224 | return $u->{$perm} if (defined($u->{$perm})); |
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225 | } |
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226 | } |
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227 | return; |
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228 | } |
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229 | |
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230 | sub dump { |
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231 | my ($self) = @_; |
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232 | my $dump = sprintf("%s.{%s}\n", $self->{obj}, join(', ', @{$self->{attr}})); |
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233 | foreach my $u (@{ $self->{users} }) { |
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234 | $dump .= sprintf("\t%s: %s\n", |
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235 | $u->{user}, |
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236 | join(', ', ($u->{r} ? 'read' : ()), ($u->{w} ? 'write' : ())) || |
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237 | 'deny'); |
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238 | } |
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239 | $dump |
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240 | } |
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241 | |
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242 | 1; |
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243 | |
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244 | __END__ |
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