IBM Tivoli Access Manager for e-business: WebSEAL Administration ...

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Preventing vulnerability caused by cross-site scripting Cross-site scripting refers to a technique used to cause Web server vulnerability by embedding malicious code into the URLs of Web requests. WebSEAL provides certain built-in protection for this type of vulnerability and allows you to further refine the protection by configuring URL string filtering. Note: The term ″cross-site scripting″, although accepted by the industry, does not entirely describe the range of issues involving embedded malicious code. Background Cross-site scripting is a specific type of Web Server vulnerability created when a client URL request includes embedded malicious scripting. For example (Javascript): malicious_code Other scripting tags that could be used to create vulnerability include , , and . When a user clicks on a link containing the malicious code (or enters such a URL directly), the script is executed when the HTML is read by the user’s browser. For example, an attack can occur when a user clicks on a link that contains the following URL: https:///malicious_code In this example, the object is not found and WebSEAL responds by returning a 404 ″Page Not Found″ HTML error page. This error page happens to include the URL containing the malicious Javascript. The browser interprets the URL and executes the script. Refer to the following CERT advisory for complete information about the mechanics of cross-site scripting and general preventative measures: http://www.cert.org/advisories/CA-2000-02.html Configuring URL string filtering The problem of cross site scripting—and embedded malicious code in general—is handled in two ways. WebSEAL encodes angle brackets (< >) in re-directed URLs. The encoding can help prevent normal interpretation of scripts by the browser. You can define string patterns to be illegal by adding entries to the [illegal-url-substrings] stanza in the WebSEAL configuration file. For example: [illegal-url-substrings] substring =
WebSEAL, by default, filters strings containing
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IBM Tivoli Access Manager for e-bus
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Note Before using this information
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Silent configuration overview . . .
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Event capturing and logging . . . .
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Token authentication concepts . . .
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Configuring WebSEAL key database pa
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Preserving cookie names . . . . . .
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Logging . . . . . . . . . . . . . .
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xvi IBM Tivoli Access Manager for e
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This chapter introduces you to impo
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Web security information v IBM Tivo
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v Secure Sockets Layer Introduction
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The following documents associated
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Monospace Code examples, command li
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IBM Tivoli Access Manager WebSEAL:
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The access control list (ACL) An ac
Page 34 and 35: Note: Traditional applications bund
Page 36 and 37: v Authenticated clients access usin
Page 38 and 39: v A user makes a request for a reso
Page 40 and 41: A unified Web space simplifies the
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Page 44 and 45: Server instance configuration This
Page 46 and 47: Table 1. WebSEAL instances sharing
Page 48 and 49: - When the Web document root is not
Page 50 and 51: -ssl_yn ssl_enable_yes_no -key_file
Page 52 and 53: Server instance configuration tasks
Page 54 and 55: Removing a server instance To remov
Page 56 and 57: Communication protocol configuratio
Page 58 and 59: Restricting connections from specif
Page 60 and 61: Cryptographic hardware for encrypti
Page 62 and 63: You can specify whether to enable F
Page 64 and 65: 3. In the Open dialog window, selec
Page 66 and 67: Quality of protection levels You ca
Page 68 and 69: Configuring authorization database
Page 70 and 71: 3. Change the settings for the data
Page 72 and 73: Multi-locale support with UTF-8 Thi
Page 74 and 75: WebSEAL generates logging and audit
Page 76 and 77: Configuring multi-locale support Co
Page 78 and 79: WebSEAL does not recognize UTF-8 en
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Page 82 and 83: Language System Directory English (
Page 86 and 87: Replicated front-end WebSEAL server
Page 88 and 89: The session cookie links to session
Page 90 and 91: Table 4. P3P default header values
Page 92 and 93: Table 6. Supported values for the c
Page 94 and 95: For each value specified for purpos
Page 96 and 97: example, when your compact policy s
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Page 100 and 101: Server tasks Start a WebSEAL server
Page 102 and 103: Managing the Web space The followin
Page 104 and 105: You can configure the specific grap
Page 106 and 107: Parameter Description cache-type Sp
Page 108 and 109: HTTP data compression WebSEAL serve
Page 110 and 111: Compression policy in POPs You can
Page 112 and 113: HTTP error message pages When WebSE
Page 114 and 115: Filename Title Description HTTP Err
Page 116 and 117: Managing custom account management
Page 118 and 119: Macro Description %CERTAUTHN% Subst
Page 120 and 121: Backup and restore Tivoli Access Ma
Page 122 and 123: Problem determination tools for Web
Page 124 and 125: Logging WebSEAL serviceability mess
Page 126 and 127: Event capturing and logging You can
Page 128 and 129: In this example, none of the option
Page 130 and 131: Authentication event log output Aut
Page 132 and 133: Table 18. Authentication errors (co
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Log Files Location Parameter Enable
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Displaying referer.log The referer.
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WebSEAL-specific ACL policies The f
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Configuring three strikes login pol
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Configuring password strength polic
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Specific user and global settings T
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v token authentication v certificat
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The entry level = unauthenticated m
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Table 20. Example integer values fo
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pdadmin> pop modify test set ipauth
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Quality of protection POP policy Th
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128 IBM Tivoli Access Manager for e
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Overview of the authentication proc
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Managing session state A secure con
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This value corresponds to the numbe
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eauthenticating the user. WebSEAL u
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v Because the cookies are available
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Authentication configuration overvi
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Configuring multiple authentication
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3. When the client makes an additio
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You can configure the username and
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Configuration conditions If forms a
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If the security policy does require
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Setting Description accept-client-c
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Thus, the default value for cert-ca
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HTTP header authentication Tivoli A
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See also: v “Authentication metho
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Token authentication Tivoli Access
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2. WebSEAL returns an authenticatio
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4. Restart the WebSEAL server. See
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Failover authentication This sectio
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authenticates using forms authentic
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Administrators can configure WebSEA
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cookie. By using the cookie, the We
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Specify the protocol for failover c
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Backwards compatibility WebSEAL ser
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[failover-add-attributes] attribute
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v When this value is no, and the se
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SPNEGO protocol and Kerberos authen
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v The client cannot use an SSL sess
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Switch user authentication The WebS
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9. The administrator ends the switc
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supported mechanism, an additional
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The authentication method parameter
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The default file name is switchuser
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xauthn_username xauthn_qop xauthn_i
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Server-side request caching This se
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v “Modifying request-body-max-rea
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Configuring reauthentication based
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Extending the session cache entry l
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Configuring reauthentication based
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Extending the session cache entry l
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Automatic redirection during user l
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Configuring post password change pr
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WebSEAL provides an external authen
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credattrs_email joeuser@bigco.com c
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Credential refresh This section con
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The default lifetime of data in the
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Credential refresh configuration To
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efresh can succeed. Likewise, when
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Managing client-side and server-sid
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At installation, WebSEAL uses the s
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Setting the maximum number of cache
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Windows desktop single sign-on This
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v Failover authentication The failo
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Each WebSEAL instance must have a s
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highly secure password, such as a r
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Note: The location of the kinit uti
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v When a problem occurs, consider e
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The link contains a special CDSSO m
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2. Edit /etc/nsswitch.conf so the h
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[authentication-mechanisms] sso-cre
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http://websealB/resource.html?PD-ID
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Each entry in the WebSEAL is assign
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e-community single sign-on E-commun
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A user who fails authentication wit
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4. After successful login, the MAS
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v The domain-specific cookie contai
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owser is Microsoft Internet Explore
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1. Enabling and disabling e-communi
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[e-community-domain-keys] dA.com =
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For example: [e-community-sso] vf-u
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[server] pre-510-compatible-tokens
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[ecsso-incoming-attributes] my_spec
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WebSEAL junctions overview You can
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Managing junctions with Web Portal
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Configuring a basic WebSEAL junctio
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Mutually authenticated SSL junction
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v It is highly recommended that you
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WebSEAL-to-WebSEAL junctions over S
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v “Processing URLs in requests”
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Modifying absolute URLs with script
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To solve this problem: 1. Always wr
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You must create the jmt.conf mappin
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Part 2: -j junctions modify Set-Coo
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Supplying client identity in HTTP h
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[junction] max-webseal-header-size
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ack-end server UUID to each front-e
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v Back-end server 2 is called APP2
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lcp_uri URI encoded local code page
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v Do not mark any certificate in th
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1. Copy query_contents.sh into a fu
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Typical output looks like: 100 inde
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Configuring BA headers for single s
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Forwarding original client BA heade
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Using global sign-on (GSO) Tivoli A
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Configuring a GSO-enabled WebSEAL j
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Configuring single sign-on to IBM W
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Configuring single sign-on forms au
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WebSEAL parses the HTML page to ide
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[loginpage1] login-page = /cgi-bin/
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It is not necessary to specify hidd
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Supporting CGI programming To suppo
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Supporting back-end server-side app
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v Short name of the server v IP add
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pdadmin> objectspace create /Resour
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A single user that logs in multiple
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346 IBM automatically with no user
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Note: If you use Web Portal Manager
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Object Space Entry URL Template /ow
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The following sample dynurl.conf fi
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The security policy To provide suit
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Overview of ADI retrieval The Tivol
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The resource-manager-provided-adi p
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Retrieving ADI from the user creden
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Dynamic ADI retrieval Rules can be
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Basic configuration Basic configura
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trace_verbose_get_entitlement If se
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Erandt_Securtities_Entitlements e
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http://ese.erant.com/attributes 1 U
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376 IBM v v /opt/pdwebars/protocol_
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Windows C:\Program Files\Tivoli\PDW
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including tracking CGI types, compi
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Stanza organization The remainder o
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Server configuration v [server] v [
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HTTP/1.1 connection timeout, in sec
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Location of the file that contains
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Enable or disable support for UTF-8
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Specifies how WebSEAL responds to r
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Host name of the LDAP server. The W
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cache-group-expire-time = number_of
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String that specifies the key label
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Active Directory [uraf-ad] stanza a
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ind-pwd = admin_password Encoded ad
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LDAP port number for the Lotus Domi
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Secure Socket Layer [ssl] stanza we
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Disables support for SSL Version 2.
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Port number for communication with
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Indicates whether automatic refresh
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Authentication methods [ba] stanza
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Specifies how to handle certificate
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Step-up authentication levels. WebS
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Fully qualified path for a library
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failover-certificate = fully_qualif
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Authentication failover v [failover
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List of attributes from the origina
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Cross-domain single sign-on v [cdss
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attribute_pattern = {preserve|refre
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Integer value specifying the port n
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File names for keys for any domains
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List of string values to specify th
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Integer value for lifetime, in seco
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Content This section contains the f
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Specifies how standard WebSEAL HTML
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Page containing a change password f
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Automatic redirect v [acnt-mgt] v [
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List containing system environment
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Relative path name to a graphics fi
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Content compression v [compress-mim
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Content encodings [content-encoding
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Junction management [junction] stan
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Positive integer value indicating t
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Document filtering [filter-url] sta
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Scheme filtering [filter-schemes] s
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Script filtering v [script-filterin
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Credential refresh [credential-refr
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Integer value that specifies the ti
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Integer value that specifies the ti
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Enables or disables the requests lo
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Auditing [aznapi-configuration] sta
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Specifies event logging for the spe
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The maximum size of the in-memory p
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Policy server v [policy-director] v
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Specifies the type of access the us
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v state Mechanisms for maintaining
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Specifies the purpose of the inform
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Specifies the recipients of the inf
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For example, if the configured name
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-p port TCP port of the back-end th
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IBM may use or distribute any of th
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asic authentication configuring 145
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F failover authentication configura
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key management (continued) managing
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eauthentication (continued) based o
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User Registry Adapter Framework (UR
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