TPOP3D.CONF(5) File Formats Manual TPOP3D.CONF(5) NAME tpop3d.conf - configuration file for tpop3d(8) SYNOPSIS # comment key: value key: value \ continuation of value ... DESCRIPTION The tpop3d configuration file, tpop3d.conf, consists of a number of key: value pairs. Blank lines and comments introduced by `#' are ignored. It is legal for value to be blank. Presently-recognised configuration directives are: Global options listen-address: address[:port][(domain)|/regex/][;tls-options] ... Specify an address and optional port on which incoming connections are accepted. domain is the domain name for which the service is op- erated; alternatively, if mass virtual hosting support is compiled in (the default), then you can specify regex, a POSIX extended regu- lar expression containing a single bracketed subexpression, instead of domain; in this case, the regular expression is applied (in a case-insensitive sense) to the name of the host to which the client has connected, and the matching subexpression is used as the domain name. This only really makes sense if address is 0.0.0.0 (IN- ADDR_ANY). If neither domain nor regex are given, the portion of the name associated with the given address following the first `.' is used, or, if no such name can be established, the nodename of the system determined by uname(2). If any port is not specified, it is assumed to be 110 (pop-3), or 995 (pop-3s) if in `immediate' TLS mode. If tpop3d has been compiled with support for TLS (`SSL'), then you may specify additional tls-options for each address, in the follow- ing form: tls=(immediate|stls),certificate[,private-key] The first token after tls= specifies the mode of TLS operation in use on this address. There are two widely-supported modes of POP-3-over-TLS operation. In the first case, which we call immediate mode, TLS negotiation is initiated immediately after a connection is received. In this mode, only TLS connections can be made to a par- ticular address. In the other mode, the client establishes an unen- crypted TCP connection, then issues the POP-3 command STLS to initi- ate TLS negotiation. We call this stls mode. This mode permits unen- crypted and TLS operation on the same address. The cryptographic identity to use for this address is read from the files named by certificate and private-key. If only certificate is given, then both the certificate and the private key should be con- tained in the one file. If a pass-phrase is required to make use of the certificate or private key, then tpop3d must be started with the -P option (see tpop3d(8)) to read the pass phrase from the terminal. To listen for connections on any interface and the default port, the directive listen-address: 0.0.0.0 is sufficient. To specify a specific domain, use this syntax: listen-address: 12.34.56.78(example.com) 0.0.0.0(example.org) If, alternatively, the machine has numerous interfaces with names pop3.example.com, pop3.example.org, etc., you could specify listen-address: 0.0.0.0/^pop3\.(.*)$/ to accept incoming connections and associate them with the proper domains. Note that for this to work, all interfaces on which con- nections are to be accepted must have functioning inverse name reso- lution; also, in this case, tpop3d will do a name lookup for each incoming connection, which may block in the event of a DNS failure. You may wish to create some other mapping -- perhaps in /etc/hosts -- to ensure that this does not occur. max-children: number The maximum number of child processes which may be actively serving connections at any given time. Consists of a single number. By de- fault, this is set to 100. append-domain: (yes|true) If authentication does not succeed for a given username, retry with username@domain, where domain is the domain name associated with the address on which the connection was received. This is intended to be used where multiple virtual domains are served from multiple IP ad- dresses. This option only takes effect when username does not con- tain a separator. See below for a more detailed description. strip-domain: (yes|true) If authentication does not succeed for a given username, and the username supplied is in the form username@domain, try the authenti- cation again with a bare username. domain need not be the domain name associated with the address on which the connection was re- ceived. This is intended to be used where multiple domains are served by a single authenticator with the same username, such as when username@domain.com and username@domain.net are equivalent and served from the same machine. This option only takes effect when username contains a separator, which may be specified via the do- main-separators config option. (see below) domain-separators: string Specify which characters may be used to separate local_parts from domains in POP3 usernames. The default is "@%!:". apop-only: (yes|true) Disconnect any client which attempts plaintext USER/PASS authentica- tion. The intention of this option is to discourage users from send- ing plaintext passwords over the network, so it has no effect when a user is connected over a TLS-secured connection. lowercase-user: (yes|true) Convert the string provided with the POP3 USER command to lowercase letters. This may be usefull with case-sensitive operations like authentication against dbm files or case-sensitive SQL databases. timeout-seconds: number This is the number of seconds for which a connection may be idle for before it is closed. If it is set to 0, then timeouts are disabled. The default value is 30 seconds (see the section on BUGS in tpop3d(8)). If you wish to have tpop3d comply explicitly with the RFC (which demands a ten-minute timeout), then specify 600 seconds. This may be necessary with some clients which pause randomly whilst downloading messages. tcp-send-buffer: number This is the largest number of bytes which may be `in flight' between the server and a client at any time. Setting this to larger values may improve the performance of tpop3d, but at the risk of timing out clients connected by slow networks. You should not set this parame- ter to anything larger than the timeout multiplied by the data rate (in bytes per second) of the slowest network through which clients will connect to the POP3 server. This is set using the SO_SNDBUF socket option; see socket(7) for more information. The default is 16,384 bytes; set this to 0 to use the system default. log-facility: facility This selects the `facility' as which tpop3d emits system log mes- sages. Possible values for facility are: mail, authpriv, daemon, user, and local0 through local7 inclusive. (Although other possi- bilities are mentioned in openlog(3), they don't make much sense for a POP3 server.) log-level: level This selects the `level' at which tpop3d logs system log messages. Possible values for level are described in syslog.conf(5). log-stderr: (yes|true) Send log messages to standard error as well as the system log. This makes sense only when tpop3d is running with a controlling terminal. no-detach: (yes|true) Do not detach from controlling terminal. The -d command-line option to tpop3d is equivalent to combining this and the log-stderr direc- tives. mailbox: [mailbox-driver:]path-spec ... This selects the location, and optionally the type, of the mailbox to use when a user is authenticated. Mailbox-driver should be one of the names listed when you execute tpop3d -h; if left blank the de- fault (first available) one is used, but this is discouraged as it may vary between builds of tpop3d. Path-spec should give a path name in the file system; you can use the substitution strings $(user), the username supplied to the POP server by the client; $(lo- cal_part), the local part of a client's email address in a virtual- domain authentication, $(domain), the domain, and $(home) for the user's home directory. In addition, the syntax $(foo[index]) may be used to select a given letter of the string. 0 is the first charac- ter, and -1 the last. This allows the used of `hashed' spool direc- tories; for example, mailbox: bsd:/var/spool/mail/$(user[0])/$(user) If several mailbox locations and types are specified, tpop3d will try each in turn, stopping when it opens a mailbox or encounters an error other than the mailbox not being present. This means that if your users have both maildir and bsd mailboxes, you can use some- thing like mailbox: maildir:$(home)/Maildir bsd:/var/spool/mail/$(user) to support both. Some authentication drivers will set the mailbox explicitly, over- riding this option. Those that do not also have a specific option, of the form auth-foo-mailbox: which overrides the global setting. lowercase-mailbox: (yes|true) Convert the directory/file part of the mailbox specification (see above) to lowercase letters, if retrieved by an authentication dri- ver. (E.g. due to a database lookup.) Usefull only in cases where case-sensitive filesystems are in use, of course. mailspool-index: path-spec This selects the location of metadata cache files for BSD mail- spools, based on their file names. This option is only available when tpop3d is compiled with metadata caching enabled, and it is only switched on when this option is specified. Path-spec gives the location of the metadata cache file, using sub- stitution strings similar to those for the mailbox option above. In particular, you can use $(name), the full name of the mailspool; $(path), the directory containing the mailspool; $(file), the file name of the mailspool (the part after the final `/'); and $(es- caped_name), which is the full name of the mailspool escaped using the HTTP-style %.. convention so that it does not contain any slashes. Examples include: mailspool-index: $(name).tpop3d-index mailspool-index: /var/spool/tpop3d/$(escaped_name) In order to use this facility, tpop3d must be able to write the metadata cache files to the locations specified. If you choose to use a specific directory for this (for instance, /var/spool/mail or /var/spool/tpop3d), you will need to set appropriate permissions. 1777 (as for /tmp) is probably the best choice. tpop3d will over- write any file whose name is the same as the specified cache file for a given mailspool; therefore, it is recommended that the mail- spool index files be stored in a directory to which users would not customarily have access, for instance /var/spool/tpop3d. mailspool-no-dotfile-locking: (yes|true) By default tpop3d will try to lock a mailspool for exclusive access using all methods available on the local system: fcntl(2), flock(2), and creating a lockfile for the mailspool with a `.lock' suffix. This option allows you to switch off the last of these without re- compiling the daemon, and is recommended if you are absolutely cer- tain that no other programs rely on dotfile-locking to synchronise access to mailspools. In particular, if you use lockfiles, it is possible for an over-quota user to be unable to log in to the POP3 server, because creation of the lockfile is prohibited; switching on this option eliminates that possibility. maildir-exclusive-lock: (yes|true) Indicates that tpop3d should attempt to lock maildir mailboxes for exclusive access, so that it more closely follows the behaviour de- scribed in RFC1939. Even if not specified, tpop3d behaves intelli- gently when a message in a maildir is moved or deleted, so this op- tion is not necessary. maildir-recursion: (yes|true) Tells tpop3d to display messages in IMAP folders as if they were in the INBOX. Useful if you mix POP3 with IMAP clients such as webmail systems. maildir-ignore-folders: [foldername [...]] Specifies IMAP folders (without the leading dot) that should be ex- cluded from maildir-recursion. May be empty; more than one folder should be separated by spaces or tabs. Items beginning with "^" are treated as POSIX Extended Regular Expressions. The default is: maildir-ignore-folders: Trash Sent maildir-evaluate-filename: (yes|true) If enabled, tpop3d tries to extract information about modification time and message size out of the message filenames when reading a maildir. This saves some disk I/O, as we don't have to stat() on each file. Extraction of information from the unique filenames in a maildir is NOT common practise, so use with care! You have to en- sure, that message filenames conform to the following pattern: The message filename has to begin with the UNIX timestamp of the time the message was delivered. The size of the message in bytes may appear anywhere in the filename but has to be preceded with a unique string, which can be altered by maildir-size-string in tpop3d.conf. If a message filename does not conform correctly, tpop3d may misin- terprete what it found, allthough if the filename turns out to be definately unusable (e.g. the unique string is not found, or it doesn't start with digits) it will fall back on using stat(). Message filenames are by default set correct by reasonable recent versions of qmail-ldap, exim users may use the maildir_tag option of the appendfile transport to conform. maildir-size-string: string Specifies the unique string tpop3d will search for when evaluating message filenames to find the messages size. See maildir-evaluate- filename for information on how this is used. The default is: maildir-size-string: ,S= uidl-style: stylename The UIDL command is used by POP3 clients to distinguish messages they allready downloaded from new ones. If you switch between POP3 server software that produce different unique-ids, these clients will download all messages again. To avoid this, tpop3d supports different unique-id formats. The available formats are: tpop3d: tpop3ds native format, the default and fallback. qmail: qmail-pop3ds format, uses message-filenames as unique-ids. tcp-wrappers-name: name This selects the `daemon name' used by tpop3d when it tests connec- tions against the TCP Wrappers access-control-mechanism. This corre- sponds to the part of an entry before the first colon in hosts.allow or hosts.deny. If not specified, this will default to `tpop3d'. This feature is only available if tpop3d has been compiled with support for TCP Wrappers. drac-server: hostname If specified, gives the name of a server to which tpop3d should send DRAC notifications about successful logins. whoson-enable: (yes|true) Enable notification of successful logins to a WHOSON server as de- fined in /etc/whoson.conf. tls-no-bug-workarounds: (yes|true) Disable workarounds for various bugs in client TLS implementations, as described in SSL_ctx_set_options(3). Only available if tpop3d has been built with TLS support. Options relating to authentication tpop3d supports a number of authentication methods, each of which has a number of configurable options, which are given below. Authentication is supported using the conventional USER/PASS method, or the challenge-response APOP method. When a client connects to tpop3d and at- tempts authentication, a request is passed to each of a number of config- ured authenticators in turn, until the client is successfully authenticated or all authenticators have been tried. The information supplied with each request consists of user, the user name as supplied by the client; local-part, the local-part of a virtual-domain email address, and domain, the domain in which authentication is taking place. By default, domain is the domain associated with the address to which the client has connected. If the client's supplied username contains one of the characters `@', `%', `:' or `!', it is interpreted as a local-part@domain combination, and the given local-part is used while the given domain replaces the domain derived from the address to which the client connected. If there is no separator, authentication is first attempted with no local- part and the default domain; if this does not succeed, and the append-do- main global option is set, then authentication will also be attempted with the local-part the same as the supplied user and the default domain. For example, if the client sends the command USER foo to the listener for domain `dom', tpop3d will try authentication with the parameters: user = foo local-part not set domain = dom If this fails, and append-domain is set, then a second attempt will be made with: user = foo local-part = foo domain = dom Otherwise no second attempt is made. If instead the client says: USER foo@bar then authentication will be attempted using: user = foo@bar local-part = foo domain = bar In this case, no alternative attempt will be made if authentication fails. These global options apply to all authenticators: permit-empty-password: (yes|true) If enabled, users may log in with an empty password. (Note that their client must send a space after the PASS command in this case.) onlogin-child-wait: (yes|true) If enabled, and the authenticator offers an `onlogin' action to be taken when a user logs in, the user's mailbox won't be opened until after the onlogin action completes (otherwise, the child does not block in this way). This is intended to allow you to use the onlo- gin feature to implement server bulletins and similar features. log-bad-passwords: (yes|true) Log incorrect passwords supplied by users who fail to log in. Use of this option is an invasion of privacy, but may be useful for debug- ging client configuration problems. no-commit-on-early-close: (yes|true) Some POP3 clients (most notably Microsoft `Outlook') will close their connection to the server immediately after issuing a QUIT com- mand and before receiving any response. Strictly they oughtn't to do that, and historically if they did, tpop3d would abort the connec- tion and not delete messages for which DELE commands had been issued during the session. That behaviour has been changed for greater com- patibility with broken clients; you can set this option to restore the previous behaviour. Doing so will reduce the chance that your clients will lose mail due to flakey network connectivity. tpop3d can cache the results of successful login attempts, and re-use them when the same user logs in again. This is probably not useful except for servers which run under very heavy load. Authentication cacheing can only be used for USER/PASS authentication; it has no effect on APOP authentica- tions. The following options control the authentication cache: authcache-enable: (yes|true) Enable the cache. It is off by default. authcache-entry-lifetime: number The number of seconds for which the results of a successful authen- tication are cached. The default value is 1 hour (3600 seconds). In order to be useful, this value must be much larger than the mean in- terval between POP sessions by a given client. For instance, if clients check mail every five minutes, then setting the lifetime to ten minutes will mean that, on average, half of authentications come from the cache and are fast. Setting it to one hour means that eleven out of twelve authentications come from the cache, and so forth. But note that this value also controls how long it takes for password changes to take effect! authcache-use-client-host: (yes|true) Some authenticators allow you to control authentication based on the IP address of the connected client. By default, the authentication cache ignores this information, so that a client which connects from more than one IP address (for instance, if their DHCP lease changes) can still be authenticated from the cache. But if you have authenti- cators whose behaviour varies based on client IP address, you must switch this option on, since otherwise the cache will give incorrect results in some cases. PAM authentication options auth-pam uses Pluggable Authentication Modules to authenticate conventional (non-virtual-domains) users. auth-pam-enable: (yes|true) Enable authentication using Pluggable Authentication Modules. auth-pam-facility: facility Sets the PAM facility name used by tpop3d to facility. Defaults to tpop3d. auth-pam-mail-group: (group-name | gid) The group name or gid under which access to the mailspool will take place. The default for this option is the primary group of the au- thenticated user, which may not work. You will normally want to set this to `mail'. auth-pam-mail-user: (user-name | uid) In normal operation, auth-pam will only authenticate users who have local accounts (i.e., for whom there exists a passwd entry and a distinct user ID). It is also possible to use PAM to authenticate arbitrary user names. This option names a local user whose creden- tials are used for users without local accounts who are authenti- cated by PAM. This option will not be useful in a typical configura- tion. Password authentication options These are only available if you compiled tpop3d with auth-passwd support. auth-passwd authenticates Unix users by direct lookups in /etc/passwd and, if configured at compile time, /etc/shadow. auth-passwd-enable: (yes|true) Enable authentication using /etc/passwd. auth-passwd-mail-group: (group-name | gid) The group name or gid under which access to the mailspool will take place. The default for this option is the primary group of the au- thenticated user, which will probably not work. You will normally want to set this to `mail'. MySQL authentication options These are only available if you compiled tpop3d with auth-mysql support. auth-mysql-enable: (yes | true) Enable MySQL authentication. auth-mysql-mail-group: (group-name | gid) The group name or gid under which access to the mailspool will take place. The default for this option is the primary group of the UNIX user associated with the virtual domain. auth-mysql-hostname: hostname Host on which to connect to MySQL, by default localhost. You may specify several hosts, separated by spaces or tabs. These hosts are tried in order until one is found working. The same database name, username and password are tried on each host. auth-mysql-database: database MySQL database to use for authentication. auth-mysql-username: username MySQL username used to access the database. auth-mysql-password: password Password of MySQL user. auth-mysql-pass-query: substitution string Query template to use for USER/PASS authentication. auth-mysql-apop-query: substitution string Query template to use for APOP authentication. auth-mysql-onlogin-query: substitution string Query template to use for POP-before-SMTP operation. Since mailbox names are stored in the database, the auth-mysql-mailbox: setting is ignored. A note on MySQL authentication The MySQL authentication scheme is intended to be used with the vmail-sql virtual domains configuration described at http://www.ex-par- rot.com/~chris/vmail-sql/, and by default the queries it uses work with that schema. However, it is also possible to use the auth-mysql-pass-query and auth- mysql-apop-query directives to specify the SQL syntax for a query to use against any database schema. These should specify queries which return the mailbox file location, password hash, Unix user and mailbox type, in that order. The variables $(user), $(local_part) and $(domain) are escaped and substituted into the string, in the same way as for the mailbox path speci- fications described above. In addition, the numerical IP address to which the client connected is substituted for $(serverhost). The nature of password hashes is described more fully in README.auth_mysql in the distribution. If you do not wish to use either of USER/PASS or APOP authentication, specify the value none for the relevant configuration di- rective; otherwise, the default (vmail-sql) query will be used. As an example, if you have a table called users which contains fields lo- gin, domain, cryptpw and the Maildir mailboxes for the users are under /path/to/$(domain)/$(local_part), then you could use auth-mysql-pass-query: \ SELECT CONCAT('/path/to/', '$(domain)', \ '/', '$(local_part)'), \ CONCAT('{crypt}', cryptpw), \ 'mail', 'maildir' \ FROM users \ WHERE login = '$(local_part)' \ AND domain = '$(domain)' The auth-mysql-onlogin-query specifies an SQL statement (most likely an IN- SERT or UPDATE) which is executed after a successful login. This is in- tended to allow you to insert a record into a database table used to permit relaying in a `POP-before-SMTP' scheme. For this query, the additional value $(clienthost) indicates the connected client host, as a numeric IP address. This statement will be executed for any successful login, not only auth-mysql logins. Note that $(local_part) may not be supplied for a given login, so you should only use it if you are sure that all relevant logins will specify it. See the description of authentication, above, for more in- formation. If more flexibility is required, consider using auth-other or auth-perl instead. Note that the username and password supplied in the configuration file are privileged information, in the sense that they would allow an arbitrary person to obtain information from the database if they have access to the machine on which it resides. The corollary to this is that the tpop3d.conf file should not be readable by arbitrary users. Postgres authentication options These are only available if you compiled tpop3d with auth-pgsql support. auth-pgsql-enable: (yes | true) Enable Postgres authentication. auth-pgsql-username auth-pgsql-password auth-pgsql-database auth-pgsql-hostname auth-pgsql-pass-query auth-pgsql-apop-query auth-pgsql-onlogin-query auth-pgsql-mail-group Behave like the equivalent auth-mysql options. LDAP authentication options These are only available if you compiled tpop3d with support for auth-ldap. auth-ldap-enable: (yes | true) Enable LDAP authentication. auth-ldap-url: substitution string Template giving an LDAP URL indicating the server against which to make authentication requests. Note that the variables $(user), $(lo- cal_part) and $(domain) may appear only in the DN part of the URL. auth-ldap-tls: (yes | true) Use an encrypted connection to contact the LDAP server. auth-ldap-searchdn: LDAP server username DN to use when binding to LDAP server to search for a user. auth-ldap-password: LDAP server password Password of search user. auth-ldap-filter: substitution string Filter template to use when searching for a user's account. auth-ldap-scope: (subtree|base|onelevel) Scope of LDAP searches. If not specified, the default is `subtree'. auth-ldap-mailbox: [mailbox-driver:]path-spec ... User mailbox location, as described above. or auth-ldap-mailbox-attr: attribute name auth-ldap-mboxtype-attr: attribute name LDAP attributes which contains the name of a user's mailbox, and its type. If the type is not specified, or if the attribute is not present for a given user, the driver will guess that mailbox names which end `/' are of type maildir, otherwise of type bsd. auth-ldap-mail-user: (user-name | uid) auth-ldap-mail-group: (group-name | gid) User and group under which access to the mailbox will take place. or auth-ldap-mail-user-attr: attribute name auth-ldap-mail-group-attr: attribute name LDAP attributes which specify the user and group under which access to the mailbox will take place. A note on LDAP authentication tpop3d uses a search-bind model for authenticating users against an LDAP server. When a user attempts to log in by supplying a username and pass- word, tpop3d will attempt to locate an LDAP record for the user by substi- tuting for $(user), $(local_part) and $(domain) in the base DN given by auth-ldap-url and in the auth-ldap-filter filter template, binding to the LDAP server as the search user, and querying the LDAP server with this fil- ter. If the search yields exactly one result, then an attempt is made to bind to the server using the credentials supplied by the client. If the bind is successful, then the user is authenticated. Information about the user's account, in particular, the user and group id to use for mailbox access, and the location and type of the mailbox, may be obtained either from the directory, or from values in the configuration file. Flat file authentication options These are only available if you compiled tpop3d with support for auth-flat- file. auth-flatfile-enable: (yes | true) Enable flat file authentication. auth-flatfile-passwd-file: substitution string Specify the file in which tpop3d will search for a user's password. auth-flatfile-mail-user: (user-name | uid) auth-flatfile-mail-group: (group-name | gid) User and group under which access to the mailbox will take place. A note on flat file authentication Flat files used for authentication consist of lines of user:password-hash; any other fields following a subsequent colon are ignored, so that /etc/passwd-style files may be used. The specified password hash is inter- preted as a hash produced using crypt(3), unless it is preceded by a hash- ing scheme in {}. auth-flatfile may be used for APOP authentication if the password field consists of plaintext passwords preceded by {plaintext}. The user and group under which access to the mailbox takes place with auth- flatfile are always as specified in the configuration file. The file to be used is located by substituting for $(domain) in the auth-flatfile-passwd- file filename template. External program (`other') authentication options These are only available if you compiled tpop3d with support for auth- other. auth-other-enable: (yes | true) Enable external program authentication. auth-other-program: path Program to use for external authentication; this must be an absolute path and should process requests as described below. auth-other-user: (user-name | uid) auth-other-group: (group-name | gid) The user and group under which to run the authentication program. auth-other-timeout: time The timeout in seconds for authentication; may be a fractional value, by default 0.75. A note on external program authentication The intention of auth-other is to allow administrators to implement custom virtual-domains or other authentication schemes, without having to write C code to implement them. The distribution contains a perl module, TPOP3D::AuthDriver, which makes it extremely easy to implement a new au- thentication scheme, and various example scripts. One of the advantages of this is that if you want to implement an authenticator which uses a rela- tional database other than MySQL, then you can use the support in perl's DBI library. An external authentication program reads data `packets' structured in the following format on its standard input: key\0value\0 ... \0 Defined keys are: method = (APOP | PASS) Authentication mechanism being attempted. user = username The username being sent with an APOP or USER command. local_part = local-part (Sent only for virtual-domain authentication.) The local-part of the client's email address. domain = domain (Sent only for virtual-domain authentication.) The domain of the client's email address. clienthost = IP number The host from which the client is connected to the POP server. serverhost = IP number The address to which the client connected on the POP server. timestamp = timestamp string (APOP only.) The `timestamp' string sent by the server to this client. digest = hex digest (APOP only.) Hex representation of the MD5 digest sent by the client with an APOP command. pass = password (PASS only.) The password sent with a PASS command. In response to an APOP or PASS request, the program should write to stan- dard output `packets' in the format described above. Defined keys are: result = (YES | NO) Was authentication successful? logmsg = string (Optional.) Specifies a message to be written to the system log. The following apply only if authentication is successful; all but uid and gid are optional: uid = (user-name | uid) gid = (group-name | gid) The user and group with which to access the mailspool. Note that the user must have a valid home directory. domain = domain The domain in which the user has been authenticated. mailbox = path Path of this user's mailbox. mboxtype = mailbox driver The type of the mailbox. If the mailbox is not specified, then the normal mechanism (via configura- tion directives mailbox: and auth-other-mailbox:) is used. Your authentication program will also receive packets describing any suc- cessful login. These may be used to implement POP-before-SMTP relaying. Such packets have the form method = ONLOGIN Indicating that the packet describes a login. user = username The username as supplied by the client. local_part = local-part domain = domain The local-part and domain of the authenticated user. clienthost = IP number The host from which the client is connected to the POP server. The only valid responses to an ONLOGIN request are an empty packet or one containing only a logmsg directive. Note that tpop3d requires external authentication programs to respond in a timely fashion, since authentication blocks the main daemon; if no response is received within the timeout period specified, then the program will be killed with SIGTERM; if it fails to expire, SIGKILL will then be sent. An authentication program should catch SIGTERM to do any essential cleaning up. Your authentication program must not leak memory or file descriptors; if this is a problem, have it exit after some number of transactions; tpop3d will restart it automatically. Perl authentication options These are only available if you compiled tpop3d with support for auth-perl. auth-perl-enable: (yes | true) Enable authentication via an embedded perl interpreter. auth-perl-start: perl code Specify a line of perl code to be executed at startup; in most cases, this should be something like auth-perl-start: do '/usr/local/etc/tpop3d/tpop3d.pl'; auth-perl-finish: perl code Specify a line of perl code to be executed when the authentication driver is shut down. auth-perl-apop: subroutine name Specify the name of a perl subroutine which will be called when a request for APOP authentication is received. auth-perl-pass: subroutine name Specify the name of a perl subroutine which will be called when a request for USER/PASS authentication is received. auth-perl-onlogin: subroutine name Specify the name of a perl subroutine which will be called after a successful login for POP-before-SMTP operation. A note on perl authentication The perl authentication subroutines named in the configuration file should take as their single argument a reference to a hash; this will contain keys and values as listed for auth-other above. The subroutines should also re- turn a reference to a hash, indicating results as for auth-other. In addi- tion, they may call TPOP3D::print_log with a single scalar argument to write a message via tpop3d's logging facility. The auth-perl-onlogin sub- routine is called after any successful login (not just logins mediated by auth-perl) and is intended to be used to implement POP-before-SMTP relay- ing; the return value from this subroutine is ignored, except for any logmsg hash element, which is logged in the normal way. Your perl routines must not leak memory (normally not a problem because of perl's garbage collector) or other system resources. If this is a problem, you could consider forcing tpop3d to restart every so often by calling kill(1, $$), but it would probably be preferable to use auth-other in this case. GNU dbm authentication options These are only available if you compiled tpop3d with support for auth-gdbm. auth-gdbm-enable: (yes | true) Enable authentication via a GNU dbm file. auth-gdbm-passwd-file: string Specify the dbm file in which tpop3d will search for a user's pass- word. auth-gdbm-persistent: (yes | true) Tells whether tpop3d should keep the GDBM file open (persistent: yes) all the time, or whether it should be reopened for each authen- tication request. The former should give slight better performance on heavy loaded servers, the latter is easier to handle. If you use persistent filehandles, you'll have to send a HUP signal to the lis- tener process every time after replacing the GDBM file. auth-gdbm-mail-user: (user-name | uid) auth-gdbm-mail-group: (group-name | gid) User and group under which access to the mailbox will take place. A note on GNU dbm authentication The dbm file has to store password hashes as zero-terminated strings. The specified password hash is interpreted as a hash produced using crypt(3), unless it is preceded by a hashing scheme in {}. The user and group under which access to the mailbox takes place with auth-gdbm are always as speci- fied in the configuration file. FILES /usr/local/etc/tpop3d.conf SEE ALSO tpop3d(8), mysql(1), hosts.allow(5), hosts.deny(5), TPOP3D::AuthDriver(1), regex(7), whosond(8), whoson.conf(5), RFC1939, http://www.ex-parrot.com/~chris/tpop3d/, http://www.ex-parrot.com/~chris/vmail-sql/, http://www.mysql.com/, http://lists.beasts.org/pipermail/tpop3d-discuss/. AUTHOR Chris Lightfoot <chris@ex-parrot.com>. Portions by Mark Longair and Paul Makepeace. If you have a query about tpop3d, please do not send me personal email. In- stead, please send it to the tpop3d mailing list, to which you can sub- scribe by sending an email with the subject `subscribe' to <tpop3d-discuss-request@lists.beasts.org>. There is a mailing list archive at http://lists.beasts.org/pipermail/tpop3d-discuss/. VERSION $Id$ COPYING This program is free software; you can redistribute it and/or modify it un- der the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FIT- NESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. TPOP3D.CONF(5)
NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | AUTHOR | VERSION | COPYING
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=tpop3d.conf&sektion=5&manpath=FreeBSD+Ports+15.1.quarterly>