package VNDB::Util::Auth; use strict; use warnings; use Exporter 'import'; use Digest::SHA qw|sha1 sha1_hex sha256|; use Crypt::URandom 'urandom'; use Crypt::ScryptKDF 'scrypt_raw'; use Encode 'encode_utf8'; use TUWF ':html'; use VNDB::Func; our @EXPORT = qw| authInit authLogin authLogout authInfo authCan authPreparePass authPrepareReset authValidateReset authGetCode authCheckCode authPref |; sub randomascii { return join '', map chr($_%92+33), unpack 'C*', urandom shift; } # Fetches and parses the auth cookie. # Returns (uid, encrypted_token) on success, (0, '') on failure. sub parsecookie { # Earlier versions of the auth cookie didn't have the dot separator, so that's optional. return ($_[0]->reqCookie('auth')||'') =~ /^([a-zA-Z0-9]{40})\.?(\d+)$/ ? ($2, sha1 pack 'H*', $1) : (0, ''); } # initializes authentication information and checks the vndb_auth cookie sub authInit { my $self = shift; my($uid, $token_e) = parsecookie($self); $self->{_auth} = $uid && $self->dbUserGet(uid => $uid, session => $token_e, what => 'extended notifycount prefs')->[0]; # update the sessions.lastused column if lastused < now()-'6 hours' $self->dbSessionUpdateLastUsed($uid, $token_e) if $self->{_auth} && $self->{_auth}{session_lastused} < time()-6*3600; # Drop the cookie if it's not valid $self->resCookie(auth => undef) if !$self->{_auth} && $self->reqCookie('auth'); } # login, arguments: user, password, url-to-redirect-to-on-success # returns 1 on success (redirected), 0 otherwise (no reply sent) sub authLogin { my $self = shift; my $user = lc(scalar shift); my $pass = shift; my $to = shift; if(_authCheck($self, $user, $pass)) { my $token = urandom(20); my $cookie = unpack('H*', $token).'.'.$self->{_auth}{id}; $self->dbSessionAdd($self->{_auth}{id}, sha1 $token); $self->resRedirect($to, 'post'); $self->resCookie(auth => $cookie, httponly => 1, expires => time + 31536000); # keep the cookie for 1 year return 1; } return 0; } # clears authentication cookie and redirects to / sub authLogout { my $self = shift; my($uid, $token_e) = parsecookie($self); $self->dbSessionDel($uid, $token_e) if $uid; $self->resRedirect('/', 'temp'); $self->resCookie(auth => undef); # set l10n cookie if the user has a preferred language set my $l10n = $self->authPref('l10n'); $self->resCookie(l10n => $l10n, expires => time()+31536000) if $l10n; # keep 1 year } # returns a hashref with information about the current loggedin user # the hash is identical to the hash returned by dbUserGet # returns empty hash if no user is logged in. sub authInfo { return shift->{_auth} || {}; } # returns whether the currently loggedin or anonymous user can perform # a certain action. Argument is the action name as defined in global.pl sub authCan { my($self, $act) = @_; return $self->{_auth} ? $self->{_auth}{perm} & $self->{permissions}{$act} : 0; } # Checks for a valid login and writes information in _auth # Arguments: user, pass # Returns: 1 if login is valid, 0 otherwise sub _authCheck { my($self, $user, $pass) = @_; return 0 if !$user || length($user) > 15 || length($user) < 2 || !$pass; my $d = $self->dbUserGet(username => $user, what => 'extended notifycount')->[0]; return 0 if !$d->{id}; # Old-style hashes if(length $d->{passwd} == 41) { return 0 if _authPreparePassSha256($self, $pass, substr $d->{passwd}, 0, 9) ne $d->{passwd}; $self->{_auth} = $d; # Update database with new hash format, now that we have the plain text password $self->dbUserEdit($d->{id}, passwd => $self->authPreparePass($pass)); return 1; } # New scrypt hashes if(length $d->{passwd} == 46) { my($N, $r, $p, $salt) = unpack 'NCCa8', $d->{passwd}; return 0 if $self->authPreparePass($pass, $salt, $N, $r, $p) ne $d->{passwd}; $self->{_auth} = $d; return 1; } return 0; } # Prepares a plaintext password for database storage # Arguments: pass, optionally: salt, N, r, p # Returns: encrypted password (as a binary string) sub authPreparePass { my($self, $pass, $salt, $N, $r, $p) = @_; ($N, $r, $p) = @{$self->{scrypt_args}} if !$N; $salt ||= urandom(8); return pack 'NCCa8a*', $N, $r, $p, $salt, scrypt_raw($pass, $self->{scrypt_salt} . $salt, $N, $r, $p, 32); } # Same as authPreparePass, but for the old sha256 hash. # Arguments: pass, optionally salt # Returns: encrypted password (as a binary string) sub _authPreparePassSha256 { my($self, $pass, $salt) = @_; $salt ||= encode_utf8(randomascii(9)); return $salt.sha256($self->{global_salt} . encode_utf8($pass) . $salt); } # Generates a random token that can be used to reset the password. # Returns: token (hex string), token-encrypted (binary string) sub authPrepareReset { my $self = shift; my $token = unpack 'H*', urandom(20); my $salt = randomascii(9); my $token_e = encode_utf8($salt) . sha1(lc($token).$salt); return ($token, $token_e); } # Checks whether the password reset token is valid. # Arguments: passwd (binary string), token (hex string) sub authValidateReset { my($self, $passwd, $token) = @_; return 0 if length $passwd != 29; my $salt = substr $passwd, 0, 9; return 0 if $salt.sha1(lc($token).$salt) ne $passwd; return 1; } # Generate a code to be used later on to validate that the form was indeed # submitted from our site and by the same user/visitor. Not limited to # logged-in users. # Arguments: # form-id (string, can be empty, but makes the validation stronger) # time (optional, time() to encode in the code) sub authGetCode { my $self = shift; my $id = shift; my $time = (shift || time)/3600; # accuracy of an hour my $uid = encode_utf8($self->{_auth} ? $self->{_auth}{id} : norm_ip($self->reqIP())); return lc substr sha1_hex($self->{form_salt} . $uid . encode_utf8($id||'') . pack('N', int $time)), 0, 16; } # Validates the correctness of the returned code, creates an error page and # returns false if it's invalid, returns true otherwise. Codes are valid for at # least two and at most three hours. # Arguments: # [ form-id, [ code ] ] # If the code is not given, uses the 'formcode' form parameter instead. If # form-id is not given, the path of the current requests is used. sub authCheckCode { my $self = shift; my $id = shift || $self->reqPath(); my $code = shift || $self->reqParam('formcode'); return _incorrectcode($self) if !$code || $code !~ qr/^[0-9a-f]{16}$/; my $time = time; return 1 if $self->authGetCode($id, $time) eq $code; return 1 if $self->authGetCode($id, $time-3600) eq $code; return 1 if $self->authGetCode($id, $time-2*3600) eq $code; return _incorrectcode($self); } sub _incorrectcode { my $self = shift; $self->resInit; $self->htmlHeader(title => mt '_formcode_title', noindex => 1); div class => 'mainbox'; h1 mt '_formcode_title'; div class => 'warning'; p mt '_formcode_msg'; end; end; $self->htmlFooter; return 0; } sub authPref { my($self, $key, $val) = @_; my $nfo = $self->authInfo; return '' if !$nfo->{id}; return $nfo->{prefs}{$key}||'' if @_ == 2; $nfo->{prefs}{$key} = $val; $self->dbUserPrefSet($nfo->{id}, $key, $val); } 1;