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Chapter 9. Authentication in ThinLinc
In this chapter we will describe how authentication of users is performed in ThinLinc
9.1. Pluggable Authentication Modules
Authentication of users in ThinLinc is performed using the Pluggable Authentication Modules (PAM).
This means ThinLinc can authenticate users using any system for which there is a PAM module.
Examples of PAM modules are pam_ldap for accessing LDAP directories (including Novell
NDS/eDirectory) and pam_winbind for authenticating against a Windows Domain. Of course,
authentication using the standard plaintext password files of Linux is also possible using the PAM
module pam_unix.
If ThinLinc should authenticate against the passwd database on the local host, no configuration at all is
needed, since this is how most distributions are configured at installation. However, at many sites there is
already some type of existing user database. In this chapter we’ll go into detail on how to authenticate
ThinLinc users against Windows domains and LDAP databases.
An user connecting to ThinLinc needs executable access to the ThinLinc login shell thinlinc-login and if
you don’t have any intentions to allow a regular shell access to the server you should set default login
shell for the users to /usr/bin/thinlinc-login.
9.1.1. Configuration files for PAM
PAM is configured by editing the files located in the directory /etc/pam.d/ (at least in the distributions
we’ve tested ThinLinc on).
Different Linux distributions have slightly different ways of configuring PAM. The ThinLinc installation
program will setup ThinLinc to authenticate using the same PAM setup as the Secure Shell Daemon, by
creating a symbolic link from /etc/pam.d/thinlinc to either /etc/pam.d/sshd or
/etc/pam.d/ssh, depending on which of the latter files that exists at installation. This seems to work
on most distributions. Be aware that the PAM settings for the Secure Shell Daemon might really be
somewhere else. For example, on Red Hat distributions, the file /etc/pam.d/system-auth is included
by all other pam-files, so in most cases, that is the file that should be modified instead of the file used by
sshd.
9.2. Limitations
Some PAM modules and authentication mechanisms are case sensitive, while others are not. Usernames
in the ThinLinc client are case sensitive by default, however this behaviour can be changed. See
LOWERCASE_LOGIN_NAME in Section 7.7 for details.
91
- Copyright © 2014 Cendio AB 2
- Table of Contents 3
- Chapter 1. Introduction 11
- 2.1. Session Overview 14
- Chapter 3. Installation 15
- 3.2.3. Server Sizing 16
- • Memory 17
- 3.3.4.1. Relays 21
- 3.3.4.2. DNS 22
- 3.5.1. Acquire New Licenses 23
- 3.5.4. Run tl-setup 24
- 3.7.1. Overview 25
- 3.8. VirtualGL 26
- Chapter 4. License Handling 29
- Chapter 5. Printer Features 31
- 5.2.1. CUPS Browsing 32
- 5.3. Local printer support 33
- 5.3.3. Device dependent mode 34
- 5.4. Nearest printer support 35
- 5.5. Printer Access Control 36
- 5.5.1. Theory of Operation 37
- 5.5.2. Requirements 37
- 5.5.4. Configuration 38
- 5.6.1. Configuration 39
- 6.1. Overview 41
- 6.1.3. Theory of Operation 42
- /etc/ssh/ssh_host_ 43
- /vsmserver/terminalservers 43
- 7.1. Client usage 47
- 7.1.3. Language Settings 49
- 7.1.5. The session menu 50
- 7.3. Local device export 53
- 7.3.3. Drives 54
- 7.3.4. Printer 54
- 7.3.5. Smart Card Readers 54
- 7.4. Client configuration 55
- 7.4.2. Local Devices tab 57
- /dev/ttyS0) or a Windows COM 59
- 7.4.3. Screen tab 61
- 7.4.4. Optimization tab 62
- 7.4.5. Security tab 65
- ALLOW_HOSTKEY_UPDATE 66
- Smart card - certificate filter 68
- 7.5. The XDM mode (UNIX only) 69
- 7.5.1.1. Mouse tab 70
- 7.5.1.2. Keyboard tab 70
- 7.5.1.3. Screen tab 71
- 7.6. Logfile placement 72
- • 1 for port 80 78
- • 0 for Raw 79
- • 5 for Hextile 79
- • 7 for Tight 79
- • 16 for ZRLE 79
- 7.8. Client Customizer 81
- 7.9. Advanced Topics 82
- 8.3. Linux PC 84
- ~/tl-4.3.0-clients 85
- 8.4. Solaris 87
- 8.5. Thin Terminals 87
- 8.5.3. VXL 89
- 8.5.4. HP ThinPro Terminals 89
- 8.5.5. IGEL Universal Desktop 90
- 8.5.8. Other Thin Terminals 91
- Terminal 92
- 8.6.2.1. Basic Configuration 93
- ServerAlias 94
- 8.7.3.1. Server Side 97
- 8.7.3.2. Browser Side 98
- Chapter 8. Client Platforms 100
- 9.2. Limitations 101
- • Trigger a run via iManager 104
- [root@test root] 105
- <filename.pem> 105
- 9.3.5.1. Functionality 109
- 9.3.5.2. Configuration 110
- 9.4.1. Introduction 111
- Single Sign-On 111
- 9.4.2. Key Generation 112
- 9.4.3. Server Configuration 112
- 9.4.4. Client Configuration 112
- 9.5.1. Introduction 113
- 9.5.2. General Requirements 113
- 9.5.3. Key Generation 113
- 9.5.4. Server Configuration 113
- 9.5.5. Client Configuration 114
- 9.5.6. Automatic Connection 114
- 9.5.7.1. Command line options 115
- 9.5.7.2. Configuration 116
- Configuration parameters 116
- 9.6. Using One Time Passwords 118
- Chapter 10. File Access 121
- 10.1.3.1. Using tl-mount-cifs 122
- 10.2.1. Introduction 123
- 10.2.2.1. Requirements 124
- 10.2.3.1. Requirements 126
- 10.2.3.2. Logging in 126
- 10.2.3.3. Mounting Shares 127
- 10.2.3.4. Logging out 127
- 10.2.4.1. Requirements 128
- 10.2.4.2. NDS Configuration 128
- 10.2.4.4. UNIX Configuration 129
- 10.3.1. Introduction 132
- 10.3.2. Activation 132
- 10.3.3. Configuration 133
- 11.1. Introduction 135
- 11.2. Single Sign-On 135
- 11.3. Connection Modes 135
- 12.1.1. Introduction 139
- 12.2.1. Introduction 141
- 12.2.2. Requirements 141
- 12.3.1. Introduction 142
- 12.3.2. Requirements 142
- 12.3.3.3. OSS applications 143
- 12.3.3.4. ALSA applications 144
- 12.4.1. Introduction 145
- 12.4.2. Requirements 145
- Commands in /opt/thinlinc/bin 147
- ~/.ICAClient/appsrv.ini and 152
- ~/.ICAClient/reg.ini 152
- --test ] 155
- 14.1.1. Configuration Options 157
- 14.1.2. Cluster Management 157
- 14.2.3. Parameters in /vsm/ 163
- 14.3.1.1. Log destinations 166
- 14.3.1.2. Subloggers 167
- 14.3.1.3. Log levels 167
- 14.3.2. Per-Session Logging 168
- • -MaxDisconnectionTime s 176
- • -MaxConnectionTime s 176
- • -MaxIdleTime s 176
- Chapter 15. Hiveconf 179
- 15.1.3. Mounting Datasources 180
- 15.2. Hiveconf and ThinLinc 181
- Administration Interface 183
- 16.3. Modules 184
- 16.3.3. The VSM Module 185
- 16.3.3.1. Home 186
- 16.3.3.2. VSM Master 186
- 16.3.3.3. VSM Agent 186
- 16.3.4. The Profiles Module 187
- 16.3.5. The Locations Module 189
- 16.3.5.2. Locations 191
- 16.3.6.1. Application Groups 193
- 16.3.6.4. Menu Structure 193
- Desktop Customizer 197
- 17.2.1. Concepts 198
- 17.2.3. Handling Applications 199
- • Command 200
- • Path to Icon file 201
- • Command Startup Feedback 201
- /opt/kde3 205
- See Section 16.2 for details 207
- /vsm/tunnelservices 208
- SSH tunnel, SSH terminated.) 212
- C.1. Schema extensions 215
- /etc/ldap.conf 216
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