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Code Editor : README.PGSQL
----------------------- PostgreSQL SUPPORT ------------------------ When PostgreSQL is enabled, all account info are fetched from a central Postgres database. To compile the server with PostgreSQL support, you first have to build and install the PostgreSQL client libraries. PostgreSQL is freely available from http://www.postgresql.org/ and binary packages are included in many major distributions. But if you choose a binary form, don't forget to also install the development packages if they are available separately. Then, configure Pure-FTPd with --with-pgsql and your favorite extra gadgets: ./configure --with-pgsql --with-everything If your PostgreSQL libraries are installed in a special path, you can specify it like this: ./configure --with-pgsql=/opt/pgsql In this example, headers (like pgsql.h) will be searched in /opt/pgsql/include and /opt/pgsql/include/pgsql, while related libraries will be searched in /opt/pgsql/lib and /opt/pgsql/lib/pgsql . Then, install the server as usual: make install ------------------------ PGSQL CONFIGURATION FILE ------------------------ Before running the server, you have to create a configuration file. Why a configuration file instead of simple command-line options? you may ask. Because for security reasons, you may want to hide how to connect to your PostgreSQL server. And as command-line options can be discovered by local users (with 'ps auxwww' for instance), it's more secure to use a configuration file for sensitive data. Keep it readable only by root (chmod 600) . Here's a sample configuration file: PGSQLServer localhost PGSQLPort 5432 PGSQLUser root PGSQLPassword rootpw PGSQLDatabase pureftpd PGSQLCrypt cleartext PGSQLGetPW SELECT "Password" FROM "users" WHERE "User"='\L' PGSQLGetUID SELECT "Uid" FROM "users" WHERE "User"='\L' PGSQLGetGID SELECT "Gid" FROM "users" WHERE "User"='\L' PGSQLGetDir SELECT "Dir" FROM "users" WHERE "User"='\L' Have a look at the sample pureftpd-pgsql.conf configuration file for explanations of every keyword. Save the configuration file anywhere. Let's say /etc/pureftpd-pgsql.conf . Then, you have to run the pure-ftpd command with '-l pgsql:' (it's an 'ell' not a 'one') followed by the path of that configuration file. Here's an example: pure-ftpd -l pgsql:/etc/pureftpd-pgsql.conf -B You can mix different authentication methods. For instance, if you want to use system (/etc/passwd) accounts when an account is not found in a PostgreSQL database, use -l pgsql:/etc/pureftpd-pgsql.conf -l unix ------------------------ TABLES STRUCTURES ------------------------ Pure-FTPd is very flexible and users can be stored in any way in SQL tables. You just have to have fields with the following info: - The user's login. - The user's password, hashed using argon2, scrypt or crypt(3). Pure-FTPd also accepts the "any" value for the PGSQLCrypt field. With "any", all hash functions are sequentially tried. * RECOMMENDATION: Do not use plaintext. Unless your system provides a decent crypt() function, use a PostgreSQL function to verify the hashed password or use argon2/scrypt. - The system uid to map the user to. This can be a numeric id or a user name, looked up at run-time. - The system gid (numeric or not) . - The home directory. Here's a dump of a simple table to handle this: CREATE TABLE "users" ( "User" TEXT NOT NULL, "Password" TEXT NOT NULL, "Uid" INTEGER NOT NULL default '-1', "Gid" INTEGER NOT NULL default '-1', "Dir" TEXT NOT NULL, PRIMARY KEY ("User") ) WITHOUT OIDS; Uid and Gid can be VARCHAR instead of INTEGER if you want to use names instead of values. Then, in the pureftpd-pgsql.conf configuration file, you have to provide SQL templates to fetch the needed info. Let's take the previous example: PGSQLGetPW SELECT "Password" FROM "users" WHERE "User"='\L' PGSQLGetUID SELECT "Uid" FROM "users" WHERE "User"='\L' PGSQLGetGID SELECT "Gid" FROM "users" WHERE "User"='\L' PGSQLGetDir SELECT "Dir" FROM "users" WHERE "User"='\L' For each query: \L is replaced by the login of a user trying to authenticate. \I is replaced by the IP address the client connected to. \P is replaced by the port number the client connected to. \R is replaced by the remote IP address the client connected from. \D is replaced by the remote IPv4 address, as a long decimal number. You can mix all of these to store info in various tables. For instance, with \I, you can have a different table for every domain, so that joe@domain1 won't be the same account than joe@domain2 . And with \R, you can restrict one account to one specific address. Please note that a login can only contains common characters: A...Z, a...z, 0...9, -, ., _, space, :, @ and ' . For security purposes, other characters are forbidden. You can also remove uid and gid fields in your tables and use default values instead (thus saving useless lookups) . Two directives are useful to serve that purpose: PGSQLDefaultUID and PGSQLDefaultGID. Obvious example: PGSQLDefaultUID 1000 PGSQLDefaultGID 1000 Using these directives overrides PGSQLGetUID and PGSQLGetGID. ------------------------ ARGON2 ------------------------ Password hashed with argon2i and argon2id can be used, provided that pure-ftpd was linked to libsodium. They are expected to be provided as a string, as returned by the crypto_pwhash_str() function or by its bindings. ------------------------ SCRYPT ------------------------ Password hashed with scrypt can be used, provided that pure-ftpd was linked to libsodium. They are expected to be provided in escrypt format, as returned by the crypto_pwhash_scryptsalsa208sha256_str() function or by its bindings. For example, the string $7$C6..../....YzvCLmJDYJpH76BxlZB9fCpCEj2AbGQHoLiG9I/VRO1$/enQ.o1BNtmxjxNc/8hbZq8W0JAqR5YpufJXGAdzmf3 would verify the password "test". ------------------------ PER-USER SETTINGS ------------------------ Individual settings can be set for every user, using optional queries. - PGSQLGetQTAFS is the maximal number of files a user can store in his home directory. Example: PGSQLGetQTAFS SELECT "QuotaFiles" FROM "users" WHERE "User"='\L' - PGSQLGetQTASZ is the maximal disk usage, in Megabytes. Example: PGSQLGetQTASZ SELECT "QuotaSize" FROM "users" WHERE "User"='\L' - PGSQLGetRatioUL and PGSQLGetRatioDL are optional ratios. Example: PGSQLGetRatioUL SELECT "ULRatio" FROM "users" WHERE "User"='\L' PGSQLGetRatioDL SELECT "DLRatio" FROM "users" WHERE "User"='\L' - PGSQLGetBandwidthUL and PGSQLGetBandwidthDL are optional upload and download bandwidth restrictions. Returned values should be in KB/s. Example: PGSQLGetBandwidthUL SELECT "ULBandwidth" FROM "users" WHERE "User"='\L' PGSQLGetBandwidthDL SELECT "DLBandwidth" FROM "users" WHERE "User"='\L' ------------------------ ANONYMOUS USERS ------------------------ If you want to accept anonymous users on your FTP server, you don't need to have any 'ftp' user in the PGSQL directory. But you need to have a system 'ftp' account on the FTP server. ------------------------ ROOT USERS ------------------------ If a PGSQL user entry has a root (0) uid and/or gid, Pure-FTPd will refuse to log them in. Without this preventive restriction, if your PGSQL server ever gets compromised, the attacker could also easily compromise the FTP server. Security barriers are also implemented to avoid bad implications if wrong data types (eg. binary blobs instead of plain text) are fetched with SQL queries. Hint: PostgreSQL supports views and it's common practice to define a new DB user, e.g., ftpd and a view of the 'real' user database with just the bits that the server needs. E.g., if you have virtual domains you could use: create view vftpd as select u.vuser, u.domain, u.passwd, d.uid, d.gid, '/virtual/' || u.domain || '/' || u.vuser || '/./' as homedir from vusers as u, vdomains as d where u.domain = v.domain; grant select on vftpd to ftpd; The definition of homedir shows how views can be used to enforce a canonical form for home directories - nothing short of defining this view will allow a user to drop the chroot from their home directory.
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