Auth Panic hmac.c while Local Validation

[Mrinal Sharma]

I am trying to use a newly added Local Validation functionality in dovecot version 2.3.11.  I am running dovecot inside a Docker container With base  image " debian:buster-slim". When I try to login through below command , a crash is seen.

'''
a1 login admin eyJhbGci44444zUxMiIsInR5cCI6IkpXVCJ9.eyJ1c2fyX25hbWUiOiJhZG1pbiIsInNjb3BlIjpbIm9wZW5pZCJdLCJleffiOjE3MDAxODAwNTksInN1YiI6ImFkbWluIiwiaWF0IjoxNjAwMTc5NzU5LCJhdXRob3JpdGllcyI6WyJST0xFX0FETUlOIiwiUk9MRV9VU0VSIl0sImp0aSI6ImRyOUV0MVVJWkdJZkZ0emFVZW5VRzRzcmQtQSIsImNsaWVudF9pZCI6IndlYl9hcHAifQ.T9BTZYW52p0VG9gxmTb-cf5GXF5jTOjdkqMaUMAGX-tffffft7YfdPptphGKE8FO9opxcnL--Bjy9ip-XYuWqA
''''

Crash:
dovecot_1                          | Sep 15 16:11:50 auth: Panic: file hmac.c: line 26 (hmac_init): assertion failed: (meth->context_size <= HMAC_MAX_CONTEXT_SIZE)
dovecot_1                          | Sep 15 16:11:50 auth: Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(backtrace_append+0x3d) [0x7ff77b36beed] -> /usr/lib/dovecot/libdovecot.so.0(backtrace_get+0x1e) [0x7ff77b36c00e] -> /usr/lib/dovecot/libdovecot.so.0(+0xf465b) [0x7ff77b37565b] -> /usr/lib/dovecot/libdovecot.so.0(+0xf46f1) [0x7ff77b3756f1] -> /usr/lib/dovecot/libdovecot.so.0(+0x514a6) [0x7ff77b2d24a6] -> /usr/lib/dovecot/libdovecot.so.0(+0x52415) [0x7ff77b2d3415] -> /usr/lib/dovecot/libdovecot.so.0(+0x59c09) [0x7ff77b2dac09] -> /usr/lib/dovecot/libdovecot.so.0(oauth2_try_parse_jwt+0x7bb) [0x7ff77b2db60b] -> dovecot/auth(+0x3bf71) [0x55576d3cdf71] -> dovecot/auth(db_oauth2_lookup+0x350) [0x55576d3cf030] -> dovecot/auth(auth_request_default_verify_plain_continue+0x2d6) [0x55576d3b3386] -> dovecot/auth(auth_request_verify_plain_callback_finish+0x5c) [0x55576d3b214c] -> dovecot/auth(auth_request_verify_plain_callback+0x51) [0x55576d3b2281] -> dovecot/auth(+0x30171) [0x55576d3c2171] -> dovecot/auth(+0x27ebb) [0x55576d3b9ebb] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x69) [0x7ff77b38b989] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x131) [0x7ff77b38ced1] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x4c) [0x7ff77b38ba2c] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x40) [0x7ff77b38bba0] -> /usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7ff77b3059c3] -> dovecot/auth(main+0x3e1) [0x55576d3a6fa1] -> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb) [0x7ff77b03809b] -> dovecot/auth(_start+0x2a) [0x55576d3a713a]
dovecot_1                          | Sep 15 16:11:50 auth-worker(25): Debug: conn unix:auth-worker (pid=24,uid=101): Disconnected: Connection closed (fd=-1)
dovecot_1                          | Sep 15 16:11:50 imap-login: Debug: Ignoring unknown passdb extra field: temp


dovecot --version
2.3.11.3 (502c39af9)



dovecot -n
# 2.3.11.3 (502c39af9): /etc/dovecot/dovecot.conf
# OS: Linux 4.19.76-linuxkit x86_64 Debian 10.5 fuse.grpcfuse
# Hostname: 45e39b46f6ab
auth_debug = yes
auth_mechanisms = plain oauthbearer xoauth2
auth_verbose = yes
disable_plaintext_auth = no
doveadm_password = # hidden, use -P to show it
log_path = /dev/stdout
mail_debug = yes
mail_location = maildir:/data/imap_store/%n
mail_plugins = " quota"
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Greeting {
    auto = create
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    auto = no
    special_use = \Trash
  }
  prefix =
}
passdb {
  driver = pam
}
passdb {
  args = /etc/dovecot/dovecot-oauth2.plain.conf.ext
  driver = oauth2
  mechanisms = plain login
}
plugin {
  quota = maildir:User quota
  quota_rule = *:storage=5MB
  quota_status_nouser = DUNNO
  quota_status_overquota = 552 5.2.2 Mailbox is full
  quota_status_success = DUNNO
}
protocols = imap lmtp
service doveadm {
  inet_listener http {
    port = 80
  }
}
service lmtp {
  inet_listener lmtp {
    address = *
    port = 24
  }
  process_min_avail = 5
}
ssl = no
userdb {
  driver = passwd
}
userdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
protocol lmtp {
  mail_plugins = quota
  postmaster_address = postmaster at domainname
}
protocol lda {
  mail_plugins = " quota notify push_notification"
}
protocol imap {
  imap_metadata = yes
  mail_plugins = " quota imap_quota quota"
}

Any help would be appreciated. 

Thanks,
Mrinal