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Pure-FTPd is a free (BSD), secure, production-quality andstandard-conformant FTP server. It doesn’t provide useless bells andwhistles, but focuses on efficiency and ease of use. It providessimple answers to common needs, plus unique useful features forpersonal users as well as hosting providers.
Miller Puckette. Department of Music. University of California San Diego. Photo: Brad Garton 2001. Pure Data (Pd): documentation; download.
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- Pure Data (Pd): documentation; download Pure Data Repertory Project (PDRP): documentation; download smeck, the six-channel guitar processor: documentation; download Fast, high quality peer-to-peer network audio for musicians: quacktrip Audio tools realized in Pd Some other ideas for musicians. Classes taught at UCSD Music Department Lecture Series: Voice as Musical.
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- Getting Started With Pure Data. Pure Data runs on Windows, Linux, and Mac OS X. It also runs on iPods, PDAs, and other exotic platforms such as Silicon Graphics machines. The system requirements are very relaxed, but older systems will be slower — if your machine isn't fast enough for real-time work, you can still use it as a MIDI synth editor and for other tasks which don't.
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Pure-FTPd is actively supported, and it was always designed withsecurity in mind, and the code is always re-audited as new kind ofvulnerabilities are discussed.
The server can run with privilege separation for paranoid security. Itcan even run 100% non-root, with its built-in chroot() emulation andvirtual accounts.
Transmission of cleartext passwords and commands can be avoided :Pure-FTPd has optional support for an SSL/TLS encryption layer usingthe OpenSSL library.
Pure-FTPd works on your server
The same source code compiles and runs on Linux, MacOS, OpenBSD,NetBSD, DragonflyBSD, FreeBSD, Solaris and derivatives, Tru64, Irix,HPUX and AIX.
Pre-built binary packages are available for virtually all operatingsupported systems.
Pure-FTPd speaks your language
All server messages are translated in English, German, Romanian,French, Polish, Spanish, Danish, Dutch, Italian, Brazilian Portuguese,Slovak, Korean, Swedish, Norwegian, Russian, Traditional Chinese,Simplified Chinese, Czech, Turkish, Hungarian and Catalan.
It helps your customers understand diagnostics, even when englishisn’t their native language.
Messages are in independant files and they can be easily translated tonew languages, or customized.
Transparent conversion of client to filesystem charsets isimplemented, with UTF-8 support.
An excellent choice for newbies
Beginners can install a Pure-FTPd server in 5 minutes. It can be assimple as installing the package, typing pure-ftpd &
and… that’sall. You already have a running server, and clients can start toconnect.
There’s no need to review any long and complex configuration file,where possible mistakes could have security and reliabilityimplications. Pure-FTPd uses simple command-line switches to enablethe features you need.
You can limit the number of simultaneous users, limit their bandwidthto avoid starving connection, hide system files (chroot
), haveupload/download ratios, and moderate new uploads. Custom messages canbe displayed at login-time (even changing fortune files) and when anuser enters a new directory. Also, to avoid your disks being filledup, you can define a maximal percentage, and new uploads will bedisallowed once this percentage is reached.
The FXP (server-to-server) protocol is implemented. It can beavailable for everyone, or only for authenticated users.
Kiddies are using common brute-forcing tools that are trying todiscover hidden directories. Pure-FTPd provides a protection againstthis. Anonymous access is secure by default. For instance, users can’taccess dot-files (.bash_history
, .rhosts
, …) unless you explicitlyenable this.
And to watch who’s doing what, the pure-ftpwho
command shows a tablewith currently active sessions, how much bandwidth is taken by everyuser, what files they are uploading or downloading, where they arecoming from, etc.
High flexibility for ISPs and hosting services
- System accounts can immediately have FTP access. Authentication via PAM modules is also supported. Accounts below an uid (e.g.
< 500
for daemon accounts) can be disallowed. - All accounts can be easily chrooted by default. For easy administration, a “trusted” group with no
chroot
can be defined. - FTP accounts can be distinct from system accounts, stored in an independant database. Multiple accounts can share the same system id. A built-in indexing database allows very fast lookups. It is sucessfully running with over 1.5 million accounts on the same server. System accounts can be copied to virtual FTP accounts, so that users can have different passwords for shell access and FTP access.
- LDAP authentication is also fully supported. Pure-FTPd was successfully tested with OpenLDAP and iPlanet Directory Server. It uses standard
posixAccounts
classes. - Built-in secure cryptographic hashes can be used with any LDAP server, even those that are lacking support for these hashes.
- User info can also be centralized in MySQL databases, with or without transactions. All queries are fully customizable, and requests can be built with user names, remote client addresses, local IP addresses and ports. That way, complex hosting rules can be easily implemented, even with multiple virtual servers on the same host, and multiple virtual domains with many users.
- Multiple authentication methods can be chained in any order. For instance, SQL accounts, LDAP directories and system accounts can be used at the same time.
- Custom authentication methods can easily be added. Pure-FTPd supports external authentication modules, and writing a new backend can be as simple as a few lines of shell script.
- Pure-FTPd supports a virtual quota system : accounts can have individual quota (max number of files, max total size) even when they share the same system uid.
- Bandwidth throttling is supported, with distinct settings for upload and download.
- Every user can be assigned individual quota, ratio and bandwidth.
- Every user can be allowed to connect only from a specific range on IP address, or only to its own virtual host.
- Every user can be individually restricted to his home directory or not.
- Every user can be allowed to connect only during configured time-ranges (e.g. only during business hours).
- An anti-warez system prevents users from trading if they found a public-writeable directory. Files owned by the anonymous ftp users can’t be downloaded (sysadmin has to moderate them by changing their ownership) . Also, ftp users can’t create directories by default to hide files.
- Any external shell script can be called after a successful upload. Virus scanners and database archiveal can easily be set up.
- A maximum concurrent connection from the same IP address can be enforced to avoid bandwidth starvation and denial-of-service attacks.
- Downloads can be disallowed if the system load is too high.
- Directory listings list a parametrable max number of files. Recursive listings are fully supported, with a parametrable maximal depth. So you can provide recursive search to your users without providing any simple denial-of-service.
- The pure-ftpwho command provides real-time reports of who’s doing what on the FTP server, including bandwidth usage. The result can be a full web page, and the program can also work like a standard CGI program, compatible with any web server. XML and text reports are also available, as well as a compact and easily parsable format for shell scripts.
- Log files are accurate, and they use standard syslog facilities. Additional Apache-like (
CLF
) log files can be produced. They are compatible with all web-statistic software. An extended format calledStats
is also implemented, and works with advanced third-party FTP statistic software like FTPStats and ModLogAn. FTPStats provides detailed per-user statistics. - Home directories can be created on-demand. This is especially useful with LDAP and SQL backends : just insert a row in the database, and the account is ready to go. No need to create any directory for that user : it will be automatically created the first time he will log in.
- Multiple virtual FTP servers can be hosted on the same computer, with an independant trusted IP for administration.
- Access to dot-files can be restricted, so that users can’t read/write
.ssh
directories,.bash_history
files,.rhosts
files, etc. - Safe permissions are enforced on users home directories. Customers can’t disable their accounts by mistake with an insecure “chmod 0 /” command. The “chmod” command can also be totally disabled.
- Multiple Pure-FTPd servers with different settings can run on the same host without any conflict.
- Pure-FTPd can act as private FTP server and disallow all anonymous connections regardless of the “ftp” system account. With another switch, the server can be anonymous-only, and refuse connections to all shell accounts.
- Symbolic links can be followed when users are chrooted, even when they are pointing out of the chroot jail. This unique feature makes shared content easy to set up.
- Directory aliases can be enabled, to provide shortcuts to common directories.
- Uploads are truely atomic. Web servers will not serve partial images nor broken PHP scripts when the files are being uploaded, even when content is being updated.
Compatibility with existing specifications, clients and servers
Pure-FTPd has one of the most complete implementation of the FTP protocol specifications. It includes the protocol basics, plus modern extensions like MLST/MLSD (extensible and mirror-safe directory listings).
RFC conformance is great, but in the real-life, there are a lot of buggy clients. It’s why Pure-FTPd has also workarounds for some versions of popular Windows clients that totally violates the FTP protocol. Pure-FTPd also works with broken home-made clients that don’t properly terminate lines.
So if your current setup works with another FTP server, you can safely move to Pure-FTPd without breaking anything or receiving customers complaints: things will work as before for them, and the migration will be transparent.
IPv6 is fully supported. EPSV/EPRT IPv6 protocol extensions are implemented, and every configuration option and logging feature works with IPv4 and IPv6 as well.
Pure-FTPd is the first daemon to implement ESTA
and ESTP
. These two commands ensures FTP data connection assurance, in order to increase the protocol-level security.
Firewalling is easy: Pure-FTPd can restrict the port range for passive connections, force the announced IP for masquerading gateways, or disable passive connections to deal with broken port forwarders.
Overview: As part of the Forms Content Management Program (FCMP), the Army Publishing Directorate (APD) has selected the PureEdge Viewer as a replacement for FormFlow Filler and as the new Army standard for electronic forms software. FCMP provides the Army with an enterprise-wide license for the PureEdge Viewer 6.5. This agreement covers all Active Army (military, civilian and contractors), Army Reserves, Army National Guard Bureau, and any Government or civilian users conducting official Army business. FormFlow Filler will continue to be available to users until such time as the inventory of Army forms has been converted to the new PureEdge format.
The entire forms library (which can currently be accessed today on the APD website, and the AKO and Army Home Pages) is being converted to PureEdge and the converted forms will be added to the library as they become available. In addition, once the DD forms are converted, the files will be provided to the DoD forms manager for posting on the DOD website. APD will continue to make non-fillable PDF files available. Once the full inventory of Pure Edge forms is available in the forms library APD will announce a transition period of 6 months for The Army to fully install and implement the PureEdge forms and technology. After the transition period, APD will remove FormFlow and FormFlow 99 formats from the forms library currently being accessed on the APD website, and the AKO and Army Home Pages. Pure Edge will be the only product for which APD will provide technical support.
The PureEdge Viewer opens files with the extension “.xfdl”.
The PureEdge Viewer 6.5 allows users to view, fill, digitally sign, save, submit, and print e-forms. The Viewer is a lightweight client that can run either as an extension to the user's web browser or as a standalone executable.
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PureEdge forms are “nomadic”, allowing users to complete them offline, without a network connection or client-server activity. Users with network connectivity can email forms with a simple mouse-click, using standard mail software. Users without network connectivity can ship the completed form on electronic media (CD, floppy, etc.) or print it, add a wet signature and deliver it to the processing center as hardcopy. PureEdge forms are XML-based and completely encapsulate the presentation, logic and data into a single, signable object. This object, essentially a data file, can be distributed to users in any number of ways; however, they are typically distributed via a web site or web application.
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Users can choose to run Viewer locally as a stand-alone executable, or can load it as a Netscape plug in or Internet Explorer Active Document Server within the browser. Viewer is designed to have a small client footprint, and makes use of available client technologies where possible -- this includes using the browsers for network communication, and using default MAPI clients, such as Outlook, for emailing.
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Problems or Questions with Forms: Please contact the Army Publishing Directorate via their customer service link at http://www.apd.army.mil/usapa_email.htm, eforms@hqda.army.mil or call the Army Publishing Directorate help desk at (703) 428-0545 for any technical issues or questions that you may have in regards to the use of EForms.