- dovecot - dovecot.org

[Patch] Allow sieve redirects to specified domains only
by Kadlecsik József 10 Jun '24

10 Jun '24

Hello, The use case is simple: we have to forbid sieve redirects to outside, but should be able to redirect inside. The patch below adds a new sieve configuration option sieve_allowed_redirects to list the domains to which redirects are permitted and otherwise are not allowed. Please consider it. diff --git a/pigeonhole/doc/example-config/conf.d/90-sieve.conf b/pigeonhole/doc/example-config/conf.d/90-sieve.conf index 238bcf4..3b4ac65 100644 --- a/pigeonhole/doc/example-config/conf.d/90-sieve.conf +++ b/pigeonhole/doc/example-config/conf.d/90-sieve.conf @@ -126,6 +126,10 @@ plugin { # script execution. If set to 0, no redirect actions are allowed. #sieve_max_redirects = 4 + # The comma/space separated list of email domains where redirection is allowed. + # If the list is empty, there is no restriction. + sieve_allowed_redirects = + # The maximum number of personal Sieve scripts a single user can have. If set # to 0, no limit on the number of scripts is enforced. # (Currently only relevant for ManageSieve) diff --git a/pigeonhole/src/lib-sieve/cmd-redirect.c b/pigeonhole/src/lib-sieve/cmd-redirect.c index 6a3b0a4..17e9031 100644 --- a/pigeonhole/src/lib-sieve/cmd-redirect.c +++ b/pigeonhole/src/lib-sieve/cmd-redirect.c @@ -107,6 +107,24 @@ const struct sieve_action_def act_redirect = { .commit = act_redirect_commit, }; +static bool +cmd_redirect_allowed(struct sieve_instance *svinst, + const struct smtp_address *to_address) +{ + const char **domain; + bool result = TRUE; + + if (!svinst->allowed_redirects) + return TRUE; + for (domain = svinst->allowed_redirects; *domain != NULL; ++domain) { + if (strcasecmp(*domain, to_address->domain) == 0) { + return TRUE; + } + result = FALSE; + } + return result; +} + /* * Validation */ @@ -127,6 +145,12 @@ cmd_redirect_validate(struct sieve_validator *validator, if (!sieve_validator_argument_activate(validator, cmd, arg, FALSE)) return FALSE; + if (svinst->max_redirects == 0) { + sieve_command_validate_error(validator, cmd, + "local policy prohibits the use of a redirect action"); + return FALSE; + } + /* We can only assess the validity of the outgoing address when it is * a string literal. For runtime-generated strings this needs to be * done at runtime. @@ -148,14 +172,17 @@ cmd_redirect_validate(struct sieve_validator *validator, } } T_END; + if (!result && + !cmd_redirect_allowed(svinst, + sieve_address_parse_str(raw_address, &error))) { + sieve_command_validate_error(validator, cmd, + "local policy prohibits the use of a redirect action"); + return FALSE; + } + return result; } - if (svinst->max_redirects == 0) { - sieve_command_validate_error(validator, cmd, - "local policy prohibits the use of a redirect action"); - return FALSE; - } return TRUE; } @@ -238,6 +265,11 @@ cmd_redirect_operation_execute(const struct sieve_runtime_env *renv, "local policy prohibits the use of a redirect action"); return SIEVE_EXEC_FAILURE; } + if (!cmd_redirect_allowed(svinst, to_address)) { + sieve_runtime_error(renv, NULL, + "local policy prohibits the use of a redirect action"); + return SIEVE_EXEC_FAILURE; + } if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_ACTIONS)) { sieve_runtime_trace(renv, 0, "redirect action"); diff --git a/pigeonhole/src/lib-sieve/sieve-common.h b/pigeonhole/src/lib-sieve/sieve-common.h index e79fb4d..d980c9d 100644 --- a/pigeonhole/src/lib-sieve/sieve-common.h +++ b/pigeonhole/src/lib-sieve/sieve-common.h @@ -209,6 +209,7 @@ struct sieve_instance { const struct smtp_address *user_email, *user_email_implicit; struct sieve_address_source redirect_from; unsigned int redirect_duplicate_period; + const char **allowed_redirects; }; /* diff --git a/pigeonhole/src/lib-sieve/sieve-settings.c b/pigeonhole/src/lib-sieve/sieve-settings.c index 47f70da..70addc7 100644 --- a/pigeonhole/src/lib-sieve/sieve-settings.c +++ b/pigeonhole/src/lib-sieve/sieve-settings.c @@ -267,4 +267,10 @@ void sieve_settings_load(struct sieve_instance *svinst) svinst->user_email = address; } } + svinst->allowed_redirects = NULL; + str_setting = sieve_setting_get(svinst, "sieve_allowed_redirects"); + if (str_setting != NULL && *str_setting != '\0') { + svinst->allowed_redirects = + (const char **)p_strsplit_spaces(svinst->pool, str_setting, ", "); + } } Best regards, Jozsef -- E-mail : kadlecsik.jozsef(a)wigner.hun-ren.hu PGP key: https://wigner.hu/~kadlec/pgp_public_key.txt Address: Wigner Research Centre for Physics H-1525 Budapest 114, POB. 49, Hungary

1 0

[Patch] blocklist access control for dovecot pop3/imap and pigeonhole managesieve
by John Fawcett 09 Jun '24

09 Jun '24

Hi Just in case this is useful more generally, I'm posting it to the list. While Dovecot has an access control via allow_nets, it is a user database field that applies only at the authentication stage to deny access for the specific user when there is a connection attempt from an unauthorized ip for that user. https://doc.dovecot.org/configuration_manual/authentication/allow_nets/ I don't believe there is anything that checks access at connect time to deny unwanted traffic prior to authentication, for example from compromised machines, botnets etc. Though failed connection attempts do not appear to be a significant issue, maybe better to add some safety net for the future. The attached patch is proof of concept code that introduces the parameters rbl_check and rbl_check_timeout (msecs) to the protocol section. Tested for imap, pop3 and sieve. The following is an example for sieve. protocol sieve { rbl_check = zen.spamhaus.net=127.0.0.4 rbl_check_timeout = 5000 } If the lookup results in a hit the client is disconnected with a BYE "Disconnected for policy." message and the logs report: Jun 09 12:00:56 server.example.com dovecot[977650]: managesieve-login: Disconnected: Policy (disconnected before auth was ready, waited 1 secs): user=<>, service=sieve, rip=n.n.n.n, lip=n.n.n.n The patch also makes the number of pre-login errors and post-login errors configurable (max_login_command_errors and max_command_errors respectively) for pop3, imap and sieve protocols . protocol sieve { max_command_errors = 1 max_login_command_errors = 1 } A potential extension to the logic would be "allow_nets" and "disallow_nets" parameters or maybe something more sophisticated to allow ips/networks that would otherwise be blocked or deny additional ips/networks. John

2 3

Error: Mailbox Spam: Failed to autocreate mailbox: Mailbox can't be created
by Jordan Rosenthal 09 Jun '24

09 Jun '24

Hi, I am getting the error "Error: Mailbox Spam: Failed to autocreate mailbox: Mailbox can't be created" and cannot figure out what is causing it. It seems like some sort of permissions issue, but nothing I have tried seems to fix the problem. I was running my setup for many years without issue, and this error started occurring after a recent Ubuntu upgrade. I am using getmail 6.18.4 to fetch mail from a mail server, which then calls /usr/lib/dovecot/deliver to deliver the mail to my local system. It is during this delivery that the error occurs. The dovecot-lda executable exits with status 75 and the log file contains: Jun 09 08:05:54 honeydukes dovecot[1863]: lda(sally)<1863><L9pgDaKaZWZHBwAASkLcPA>: Error: Mailbox Spam: Failed to autocreate mailbox: Mailbox can't be created Jun 09 08:05:54 honeydukes dovecot[1863]: lda(sally)<1863><L9pgDaKaZWZHBwAASkLcPA>: msgid=<REDACTED>: save failed to open mailbox Spam: Mailbox Below is my dovecot configuration. Any help would be appreciated! ------------------ # 2.3.16 (7e2e900c1a): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.16 (09c29328) # OS: Linux 5.15.0-112-generic x86_64 Ubuntu 22.04.4 LTS # Hostname: honeydukes.fios-router.home lda_mailbox_autocreate = yes lda_mailbox_autosubscribe = yes mail_location = maildir:~/Maildir mail_privileged_group = mail maildir_very_dirty_syncs = yes managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Spam { auto = create special_use = \Junk } mailbox Trash { special_use = \Trash } prefix = INBOX. separator = . } passdb { driver = pam } plugin { sieve = file:~/sieve;active=~/.dovecot.sieve } protocols = " imap sieve" service imap-login { inet_listener imap { port = 0 } } ssl = required ssl_cert = </etc/dovecot/ssl/dovecot.pem ssl_client_ca_dir = /etc/ssl/certs ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it submission_host = <redacted>.com:465 userdb { driver = passwd }

1 0

Accessing IMAP from Python with Encrypted Password
by adam＠ardaemail.com 09 Jun '24

09 Jun '24

Hello again Dovecoters! I have a need to access an IMAP mailbox via a Python script to parse and stored DMARC reports in a SQL database. Right now, I have it working however I am storing the password in plaintext in my database which obviously is not secure. How would you approach this scenario? Would you store the password in the database encrypted and configure Dovecot to accept said encrypted password? If so, can you point me in the right direction to configure Dovecot to handle this? If not, what would you recommend? Is it possible to intercept the email and upload the attachments to an AWS S3 bucket then move the email to another folder? Likewise, if someone wants to help here as well, I need to send outbound email via an authenticated user from Postfix. How would you approach this scenario? Thank you!

3 2

Can't Empty Inbox that is Over quota
by Jason Hirsh 08 Jun '24

08 Jun '24

> I have been trying to update my Postix/Dovecot/MySQL?Postfixadmin installation > > > I am currently on Dovecot. 2.3.2.1 > > I used the guide set forth in Purplehat.org <http://purplehat.org/> which is what got me in trouble as I am in between with setup. (He went off to Maria-db and NGINX I stayed with Apache and MySQL > > > What has happened is may Dovecot Mailboxes are super super saturated. adI inadvertently allowed email from an alarm > > Quota name Type Value Limit % > User quota STORAGE 239754 5120 4682 > User quota MESSAGE 882 - > > > I tried to empty with the command > > sudo doveadm expunge -A mailbox INBOX ALL > > > I get this error > > Error: auth-master: userdb list: User listing returned failure > doveadm: Error: Failed to iterate through some users. > Is there anyway I can remove Dovecot from my server and reinstalll it? It is so messed up I don’t care about losing data Jasion Hirsh

2 4

Re: Can't Empty Inbox that is Over quota
by Jason Hirsh 06 Jun '24

06 Jun '24

> On Jun 6, 2024, at 11:00 AM, Jason Hirsh <kasdivi(a)mac.com> wrote: > > > >> On Jun 6, 2024, at 3:10 AM, Aki Tuomi <aki.tuomi(a)open-xchange.com> wrote: >> >>> >>> On 06/06/2024 04:11 EEST Jason Hirsh via dovecot <dovecot(a)dovecot.org> wrote: >>> >>> >>>> Begin forwarded message: >>>> >>>> From: Jason Hirsh <kasdivi(a)mac.com> >>>> Subject: Can't Empty Inbox that is Over quota >>>> Date: June 3, 2024 at 8:15:53 PM EDT >>>> To: dovecot(a)dovecot.org >>>> >>>> I have been trying to update my Postix/Dovecot/MySQL?Postfixadmin installation >>>> >>>> >>>> I am currently on Dovecot. 2.3.2.1 >>>> >>>> I used the guide set forth in Purplehat.org <http://purplehat.org/> which is what got me in trouble as I am in between with setup. (He went off to Maria-db and NGINX I stayed with Apache and MySQL >>>> >>>> >>>> What has happened is may Dovecot Mailboxes are super super saturated. adI inadvertently allowed email from an alarm >>>> >>>> Quota name Type Value Limit % >>>> User quota STORAGE 239754 5120 4682 >>>> User quota MESSAGE 882 - >>>> >>>> >>>> I tried to empty with the command >>>> >>>> sudo doveadm expunge -A mailbox INBOX ALL >>>> >>>> >>>> I get this error >>>> >>>> Error: auth-master: userdb list: User listing returned failure >>>> doveadm: Error: Failed to iterate through some users. >>>> >>> >>> >>> Is there anyway I can remove Dovecot from my server and reinstalll it? It is so messed up I don’t care about losing data >>> >>> >>> >> >> um.. you have multiple issues. >> >> First of all, try >> > > > >> sudo doveadm expunge -u targetuser mailbox INBOX ALL >> > > > Ok I tried that ,,say its ran but postfixadmn shows the mailbox WAY quote and new message to tha user are being rejected > > "Your message to <jason(a)kasdivi.com <mailto:jason@kasdivi.com>> was automatically rejected: > Storage quota for this account has been exceeded, please try again later.Reporting-MTA: dns; triggerfish.theoceanwindow.com <http://triggerfish.theoceanwindow.com/> > Final-Recipient: rfc822; jason(a)kasdivi.com <mailto:jason@kasdivi.com> > Action: failed > Status: 5.2.2” > > So on to > > >> rf /path/to/user/home > > > It all went away. By mail doesn’t not work. Postfixadmin still shows sett is over limited. I try deleting and get a > > Problems running mailbox postdeletion script! > The mailbox postdeletion script failed, check the error log for details! > > >> -A means all users, and it only works if your userdb iteration works. >> >> If you truly do not care about user data and want just get rid of it, >> you can just rm -rf /path/to/user/home >> >> Aki

1 0

Re: Log detective help
by Michael Slusarz 06 Jun '24

06 Jun '24

> On 06/05/2024 1:22 PM MDT GDS via dovecot <dovecot(a)dovecot.org> wrote: > > Hello all, I am seeing hundreds of lines like the one below in my mail.log from this specific IP address, which belongs to Google. Is there a way to determine why this "deferred (delivery temporarily suspended)" is happening? > > Jun 5 19:09:32 arthemis postfix/error[86771]: 5D9D148296D: to=<root(a)localhost.com>, orig_to=<root@localhost>, relay=none, delay=4099, delays=4099/0.02/0/0, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to localhost.com[74.125.224.72]:25: Connection timed out) "localhost.com" - you almost certainly are intending to connect to localhost (i.e. the local loopback address, 127.0.0.1) rather than the remote domain localhost.com. So it looks like a configuration error. michael

2 1

Fwd: EXPUNGED Folder Always Visible
by Pete Long 06 Jun '24

06 Jun '24

Sorry, forgot to change the To: field :/ Pete. > Begin forwarded message: > > From: Pete Long <pete(a)valar.uk.net> > Subject: Re: EXPUNGED Folder Always Visible > Date: 6 June 2024 at 09:43:50 BST > To: Robert L Mathews <lists(a)tigertech.com> > > > >> On 5 Jun 2024, at 19:18, Robert L Mathews via dovecot <dovecot(a)dovecot.org> wrote: >> >> On Jun 5, 2024, at 12:21 AM, Pete Long via dovecot <dovecot(a)dovecot.org> wrote: >> >>> After a restart of Dovecot, I see this in the logs: >>> >>> Jun 05 08:12:07 imap(pete)<19761><KPYfSB8aj4dWH1ne>: Error: Mailbox Deleted Messages: Lazy-expunge transaction failed: Mailbox Deleted Messages: UID=1 >>> 67: lazy_expunge: Couldn't open expunge mailbox: Failed to open mailbox .EXPUNGED: Invalid mailbox name: Begins with hierarchy separator >> >> Hmmm, I'm not sure about that -- in my setup I have something different, with no actual mailbox for it: >> >> namespace { >> hidden = yes >> inbox = no >> list = no >> location = maildir:~/expunged >> prefix = .EXPUNGED/ >> separator = . >> type = private >> } >> plugin { >> lazy_expunge = .EXPUNGED/ >> lazy_expunge_only_last_instance = yes >> ... >> >> Perhaps someone else who has a similar setup to you with it as a mailbox can offer more advice, sorry! >> > > Not to worry Robert, you've given me some useful information. > > I have a workaround now which 'works for me' (TM). The gist is to copy an acl file to the .EXPUNGED mailbox when it is created, which is usually when a mail is sent, moved or deleted. I am not using global acls so note the commented line in the next paragraph. > > In /etc/dovecot/conf.d/50-expunge.conf: > > namespace inbox { > mailbox EXPUNGED { > autoexpunge = 7days > autoexpunge_max_mails = 100000 > } > } > > > mail_plugins = $mail_plugins lazy_expunge acl > plugin { > # Move messages to an .EXPUNGED mailbox > lazy_expunge = EXPUNGED > > # Define ACL so that user cannot list the .EXPUNGED mailbox > #acl = vfile:/etc/dovecot/global-acls/expunged-acl > > # Expunged messages most likely don't want to be included in quota: > quota_rule = EXPUNGED:ignore > } > > > Once the ~/Maildir/.EXPUNGED directory is created, I copy this 'dovecot-acl' file in to that .EXPUNGED directory: > > owner wstipeka > > Note that there is no l,r or x. https://doc.dovecot.org/configuration_manual/acl/#acl > > > The end result is that the .EXPUNGED mailbox contains deleted and moved mail items but the user cannot see this mailbox and cannot delete it anyway. > > If necessary I can fire up Mutt and traverse to the relevant users .EXPUNGED folder to rescue deleted items. If they also happen to have FTP and/or SSH access, I can make the dovecot-acl immutable if necessary. > > Thanks again Robert for giving me some more options. > > > All the best, > > Pete. >

1 0

Can't Empty Inbox that is Over quota
by Jason Hirsh 06 Jun '24

06 Jun '24

I have been trying to update my Postix/Dovecot/MySQL?Postfixadmin installation I am currently on Dovecot. 2.3.2.1 I used the guide set forth in Purplehat.org <http://purplehat.org/> which is what got me in trouble as I am in between with setup. (He went off to Maria-db and NGINX I stayed with Apache and MySQL What has happened is may Dovecot Mailboxes are super super saturated. adI inadvertently allowed email from an alarm Quota name Type Value Limit % User quota STORAGE 239754 5120 4682 User quota MESSAGE 882 - I tried to empty with the command sudo doveadm expunge -A mailbox INBOX ALL I get this error Error: auth-master: userdb list: User listing returned failure doveadm: Error: Failed to iterate through some users. My dovecot configurations is # 2.3.21 (47349e2482): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.5.21 (f6cd4b8e) # OS: FreeBSD 13.2-RELEASE-p4 amd64 ufs # Hostname: triggerfish.theoceanwindow.com dict { quota = mysql:/usr/local/etc/dovecot/dovecot-dict-sql.conf.ext } first_valid_gid = 110 first_valid_uid = 110 hostname = triggerfish.theoceanwindow.com last_valid_gid = 110 last_valid_uid = 110 lmtp_rcpt_check_quota = yes mail_location = maildir:/usr/local/virtual/%d/%n mail_plugins = quota managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext imapsieve vnd.dovecot.imapsieve namespace inbox { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { auto = subscribe special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } prefix = separator = / type = private } passdb { args = /usr/local/etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { expire = Trash imapsieve_mailbox1_before = file:/usr/local/virtual/sieve/rspamd/rspamd-learn-spam.sieve imapsieve_mailbox1_causes = COPY imapsieve_mailbox1_name = Junk imapsieve_mailbox2_before = file:/usr/local/virtual/sieve/rspamd/rspamd-learn-ham.sieve imapsieve_mailbox2_causes = COPY imapsieve_mailbox2_from = Junk imapsieve_mailbox2_name = * imapsieve_mailbox3_before = file:/usr/local/virtual/sieve/global/read.sieve imapsieve_mailbox3_causes = COPY imapsieve_mailbox3_name = Trash mail_home = /usr/local/virtual/%d/%n mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename mail_log_fields = uid box msgid size quota = dict:User quota::proxy::quota quota_exceeded_message = Storage quota for this account has been exceeded, please try again later. quota_grace = 10%% quota_max_mail_size = 100M quota_rule = *:storage=1G quota_rule2 = Trash:storage=+30%% quota_rule3 = Sent:storage=+30%% quota_warning = storage=95%% quota-warning 95 %u quota_warning2 = storage=80%% quota-warning 80 %u quota_warning4 = -storage=100%% quota-warning -100 %u sieve = /usr/local/virtual/%d/%n/.dovecot.sieve sieve_before = /usr/local/virtual/sieve/global/default.sieve sieve_dir = /usr/local/virtual/%d/%n/sieve sieve_global = /usr/local/virtual/sieve/global/ sieve_global_dir = /usr/local/virtual/sieve/global/ sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.environment sieve_pipe_bin_dir = /usr/local/virtual/sieve/rspamd sieve_plugins = sieve_imapsieve sieve_extprograms } pop3_client_workarounds = outlook-no-nuls oe-ns-eoh postmaster_address = admin(a)theoceanwindow.com protocols = imap pop3 lmtp sieve service auth { unix_listener /var/spool/postfix/private/auth { group = mail mode = 0666 user = postfix } unix_listener auth-userdb { group = mail mode = 0666 user = vmail } } service dict { unix_listener dict { group = vscan mode = 0660 user = vscan } } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0660 user = postfix } } service quota-warning { executable = script /usr/local/virtual/bin/quota-warning.sh unix_listener quota-warning { user = vscan } user = dovecot } ssl_ca = </usr/local/etc/ssl/openssl/theoceanwindow.com/ca_bundle.crt ssl_cert = </usr/local/etc/ssl/openssl/theoceanwindow.com/certificate.crt ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it userdb { args = /usr/local/etc/dovecot/dovecot-sql.conf.ext driver = sql } protocol lmtp { mail_plugins = quota quota sieve zlib } protocol imap { mail_plugins = quota quota imap_quota zlib } protocol pop3 { mail_plugins = quota } jason@triggerfish:/usr/local/etc/apache24/extra: Sorry about the colors. I am at whit ends with the system and dont have the energy to take on apple mail formating I imagine I have messed up a Mysql query? Thanks for bearing with me

2 2

Log detective help
by GDS 05 Jun '24

05 Jun '24

Hello all, I am seeing hundreds of lines like the one below in my mail.log from this specific IP address, which belongs to Google. Is there a way to determine why this "deferred (delivery temporarily suspended)" is happening? Jun 5 19:09:32 arthemis postfix/error[86771]: 5D9D148296D: to=<root(a)localhost.com>, orig_to=<root@localhost>, relay=none, delay=4099, delays=4099/0.02/0/0, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to localhost.com[74.125.224.72]:25: Connection timed out) Thank you,Greg

2 1