[Bug 225818] mail/dovecot: Option GSSAPI_MIT - core dump when using PAM authentication with Kerberos credentials
bugzilla-noreply at freebsd.org
bugzilla-noreply at freebsd.org
Sun Feb 11 10:11:43 UTC 2018
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225818
Bug ID: 225818
Summary: mail/dovecot: Option GSSAPI_MIT - core dump when using
PAM authentication with Kerberos credentials
Product: Ports & Packages
Version: Latest
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: Individual Port(s)
Assignee: adamw at FreeBSD.org
Reporter: woodsb02 at freebsd.org
Flags: maintainer-feedback?(adamw at FreeBSD.org)
Assignee: adamw at FreeBSD.org
SCENARIO:
- Build mail/dovecot with option GSSAPI_MIT
- Configure dovecot for PAM authentication, using PAM service "imap":
$ cat /usr/local/etc/dovecot/conf.d/10-auth.conf
auth_mechanisms = plain
passdb {
driver = pam
args = %s
}
userdb {
driver = passwd
}
- Configure imap pam to authenticate against kerberos (and enable debugging):
$ cat /etc/pam.d/imap
auth sufficient pam_krb5.so debug
account required pam_krb5.so debug
RESULT:
This results in a crash of the dovecot authentication worker before any
kerberos messages are even exchanged.
GDB BACKTRACE OF COREDUMP:
$ gdb /usr/local/libexec/dovecot/auth
GNU gdb (GDB) 8.0.1 [GDB v8.0.1 for FreeBSD]
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-portbld-freebsd12.0".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/local/libexec/dovecot/auth...done.
(gdb) core /tmp/auth.core
[New LWP 102627]
warning: Can't read pathname for load map: Unknown error: -1.
warning: Can't read pathname for load map: Unknown error: -1.
warning: Can't read pathname for load map: Unknown error: -1.
warning: Can't read pathname for load map: Unknown error: -1.
Core was generated by `dovecot/auth -w'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 strlen (str=0x0) at /usr/src/lib/libc/string/strlen.c:100
warning: Source file is more recent than executable.
100 */
(gdb) bt
#0 strlen (str=0x0) at /usr/src/lib/libc/string/strlen.c:100
#1 0x0000000012130022 in strdup (str=0x0) at
/usr/src/lib/libc/string/strdup.c:46
#2 0x0000000011b65e9d in krb5_appdefault_string (context=0x10777000,
appname=0x106f0018 "imap", realm=0x0, option=0x13b1f403 "ticket_lifetime",
default_value=0x0, ret_value=0x7fffffffe088)
at appdefault.c:165
#3 0x0000000013af4a80 in krb5_appdefault_time (context=0x0,
appname=0xffffffffaaca6003 <error: Cannot access memory at address
0xffffffffaaca6003>,
realm=0x50 <error: Cannot access memory at address 0x50>, option=0x0,
def_val=0, ret_val=0x7fffffffe0e0) at
/usr/src/crypto/heimdal/lib/krb5/appdefault.c:130
#4 0x0000000013ae3e79 in krb5_get_init_creds_opt_set_default_flags
(context=0x10777000, appname=0x106f0018 "imap", realm=0x0, opt=0x1070f3c0)
at /usr/src/crypto/heimdal/lib/krb5/init_creds.c:171
#5 0x00000000138b738f in ?? ()
#6 0x0000000000000000 in ?? ()
LOG OUTPUT:
$ cat /var/log/maillog:
Feb 11 09:20:40 mail dovecot: auth: Error: auth worker: Aborted PASSV request
for woodsb02: Worker process died unexpectedly
Feb 11 09:20:40 mail dovecot: auth-worker(34874): Fatal: master:
service(auth-worker): child 34874 killed with signal 11 (core dumped)
Feb 11 09:20:47 mail dovecot: imap-login: Disconnected (auth failed, 1 attempts
in 7 secs): user=<woodsb02>, method=PLAIN, rip=192.168.1.13, lip=192.168.1.13,
TLS, session=<GRJsRuxkf17AqAEN>
$ cat /var/log/debug.log:
Feb 11 09:20:35 mail dovecot: auth: Debug: auth client connected (pid=34853)
[34/1991]
Feb 11 09:20:40 mail dovecot: auth: Debug: client in: AUTH 1 PLAIN
service=imap secured session=GRJsRuxkf17AqAEN lip=192.168.1.13
rip=192.168.1.13 lport=
993 rport=24191 resp=AHdvb2RzYjAyAHRlc3Q= (previous base64 data may
contain sensitive data)
Feb 11 09:20:40 mail dovecot: auth-worker(34874): Debug: Loading modules from
directory: /usr/local/lib/dovecot/auth
Feb 11 09:20:40 mail dovecot: auth-worker(34874): Debug: Module loaded:
/usr/local/lib/dovecot/auth/lib20_auth_var_expand_crypt.so
Feb 11 09:20:40 mail dovecot: auth-worker(34874): Debug:
pam(woodsb02,192.168.1.13,<GRJsRuxkf17AqAEN>): lookup service=imap
Feb 11 09:20:40 mail auth: in openpam_dispatch(): calling pam_sm_authenticate()
in /usr/lib/pam_krb5.so.6
Feb 11 09:20:40 mail auth: in pam_get_user(): entering
Feb 11 09:20:40 mail auth: in pam_get_item(): entering: PAM_USER
Feb 11 09:20:40 mail auth: in pam_get_item(): returning PAM_SUCCESS
Feb 11 09:20:40 mail auth: in pam_get_user(): returning PAM_SUCCESS
Feb 11 09:20:40 mail auth: in pam_sm_authenticate(): Got user: woodsb02
Feb 11 09:20:40 mail auth: in pam_get_item(): entering: PAM_RUSER
Feb 11 09:20:40 mail auth: in pam_get_item(): returning PAM_SUCCESS
Feb 11 09:20:40 mail auth: in pam_sm_authenticate(): Got ruser: woodsb02
Feb 11 09:20:40 mail auth: in pam_get_item(): entering: PAM_SERVICE
Feb 11 09:20:40 mail auth: in pam_get_item(): returning PAM_SUCCESS
Feb 11 09:20:40 mail auth: in pam_sm_authenticate(): Got service: imap
Feb 11 09:20:40 mail auth: in pam_sm_authenticate(): Context initialised
Feb 11 09:20:40 mail auth: in pam_sm_authenticate(): Done krb5_cc_register()
Feb 11 09:20:40 mail auth: in openpam_get_option(): entering: 'auth_as_self'
Feb 11 09:20:40 mail auth: in openpam_get_option(): returning NULL
Feb 11 09:20:40 mail auth: in pam_sm_authenticate(): Created principal:
woodsb02
Feb 11 09:20:40 mail auth: in pam_sm_authenticate(): Done krb5_parse_name()
Feb 11 09:20:40 mail auth: in pam_sm_authenticate(): Got principal:
woodsb02 at WOODS.AM
Feb 11 09:20:40 mail auth: in pam_get_authtok(): entering
Feb 11 09:20:40 mail auth: in pam_get_item(): entering: PAM_RHOST
Feb 11 09:20:40 mail auth: in pam_get_item(): returning PAM_SUCCESS
Feb 11 09:20:40 mail auth: in pam_get_item(): entering: PAM_HOST
Feb 11 09:20:40 mail auth: in pam_get_item(): returning PAM_SUCCESS
Feb 11 09:20:40 mail auth: in pam_get_item(): entering: PAM_OLDAUTHTOK
Feb 11 09:20:40 mail auth: in pam_get_item(): returning PAM_SUCCESS
Feb 11 09:20:40 mail auth: in openpam_get_option(): entering: 'try_first_pass'
Feb 11 09:20:40 mail auth: in openpam_get_option(): returning NULL
Feb 11 09:20:40 mail auth: in openpam_get_option(): entering: 'use_first_pass'
Feb 11 09:20:40 mail auth: in openpam_get_option(): returning NULL
Feb 11 09:20:40 mail auth: in openpam_get_option(): entering: 'authtok_prompt'
Feb 11 09:20:40 mail auth: in openpam_get_option(): returning NULL
Feb 11 09:20:40 mail auth: in openpam_subst(): entering: 'Password:'
Feb 11 09:20:40 mail auth: in openpam_subst(): returning PAM_SUCCESS
Feb 11 09:20:40 mail auth: in openpam_get_option(): entering: 'echo_pass'
Feb 11 09:20:40 mail auth: in openpam_get_option(): returning NULL
Feb 11 09:20:40 mail auth: in pam_vprompt(): entering
Feb 11 09:20:40 mail auth: in pam_get_item(): entering: PAM_CONV
Feb 11 09:20:40 mail auth: in pam_get_item(): returning PAM_SUCCESS
Feb 11 09:20:40 mail auth: in pam_vprompt(): returning PAM_SUCCESS
Feb 11 09:20:40 mail auth: in pam_set_item(): entering: PAM_AUTHTOK
Feb 11 09:20:40 mail dovecot: auth-worker(34874): Debug:
pam(woodsb02,192.168.1.13,<GRJsRuxkf17AqAEN>): #1/1 style=1 msg=Password:
Feb 11 09:20:40 mail auth: in pam_set_item(): returning PAM_SUCCESS
Feb 11 09:20:40 mail auth: in pam_get_item(): entering: PAM_AUTHTOK
Feb 11 09:20:40 mail auth: in pam_get_item(): returning PAM_SUCCESS
Feb 11 09:20:40 mail auth: in pam_get_authtok(): returning PAM_SUCCESS
Feb 11 09:20:40 mail auth: in pam_sm_authenticate(): Got password
Feb 11 09:20:40 mail auth: in openpam_get_option(): entering: 'no_user_check'
Feb 11 09:20:40 mail auth: in openpam_get_option(): returning NULL
Feb 11 09:20:40 mail auth: in openpam_get_option(): entering: 'no_user_check'
Feb 11 09:20:40 mail auth: in openpam_get_option(): returning NULL
Feb 11 09:20:40 mail auth: in pam_sm_authenticate(): Done getpwnam()
Feb 11 09:20:40 mail dovecot: auth-worker(34875): Debug: Loading modules from
directory: /usr/local/lib/dovecot/auth
Feb 11 09:20:40 mail dovecot: auth-worker(34875): Debug: Module loaded:
/usr/local/lib/dovecot/auth/lib20_auth_var_expand_crypt.so
--
You are receiving this mail because:
You are the assignee for the bug.
More information about the freebsd-ports-bugs
mailing list