https://bugzilla.redhat.com/show_bug.cgi?id=1886841
Bug ID: 1886841
Summary: Pinpad card reader for login authentication yet you
are asked also enter pin on pc keyboard
Product: Fedora
Version: 32
Hardware: x86_64
URL: https://lists.fedoraproject.org/archives/list/freeipa-
users(a)lists.fedorahosted.org/thread/FLLIA5RLHT3MO4NI2F
3MJNMBBNGGZA4Z/
OS: Linux
Status: NEW
Component: sssd
Severity: high
Assignee: sssd-maintainers(a)lists.fedoraproject.org
Reporter: peter(a)unix-edu.se
QA Contact: extras-qa(a)fedoraproject.org
CC: abokovoy(a)redhat.com, atikhono(a)redhat.com,
jhrozek(a)redhat.com, lslebodn(a)redhat.com,
mzidek(a)redhat.com, pbrezina(a)redhat.com,
rharwood(a)redhat.com, sbose(a)redhat.com,
ssorce(a)redhat.com,
sssd-maintainers(a)lists.fedoraproject.org
Target Milestone: ---
Classification: Fedora
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
Firefox/68.0
Build Identifier:
Hello Folks!
We are working on getting smart card authentication working using pinpad card
readers for improved security.
To do this we use:
FreeIPA Server is running on Fedora 32 with latest updates.
FreeIPA Clients is Fedora 32 Workstation installed on pc with latest updates
with connected usb card reader.
The card reader is Gemalto CT700 with pinpad, we use several user individual
SmartCard HSM 4K with FreeIPA signed certificates on them.
FreeIPA Clients run OpenSC and are configured to use smartcard certificate
based authentication, setup per Smartare HSM best practice.
Further clients are using SSSD and not PAM_PKCS#11.
All working great using smartcard for authentication, as long not enabling the
pinpad in opensc.
If doing so we are prompted for the PIN not only in the pinpad reader but also
GDM prompts you to enter PIN on keyboard.
Expected result is to be logged in directly after entering correct PIN code on
pinpad reader, not being prompted by GDM to enter PIN on keyboard as well.
If enabling pinpad in opensc, login gets a bit odd:
1. Fedora 32 Workstation GDM menu prompts a few users that can login.
2. Smartcard is inserted in reader.
3. GDM blanks out the screen and smartcard reader prompts to enter PIN in its
lcd display.
4. Entering pin on smartcard reader followed by pressing ok button on smartcard
reader at getting result Pin OK in reader display.
5. GDM now prompts for entering PIN on keyboard, this is unexpected, instead of
directly being logged in to the window manager, here Gnome (or xfce, whatever
window manager you selected to use).
6. You have to enter the PIN now on keyboard, followed by hitting enter.
7. Once again smartcard reader now prompts for PIN in its lcd display.
8. Entering PIN on the smartcard pinpad reader followed by pressing pinpad ok
button.
9. You are now logged in, and all is normal. If ripping out the smartcard from
reader the screen locks, as expected.
Sometimes, but not always, you are logged in to window manager directly after
step 5.
What could this be, anyone who have seen this before or know how to set it up ?
Reproducible: Always
Steps to Reproduce:
1. Install and setup FreeIPA server and client on Fedora32 latest updates to
use smartcard authentication for login.
Work on IPA Server:
-------------------
Install Fedora 32 server minimal installation all excluded, update to latest
version (dnf update -y), set hostname, enter server hostname
(ipaserver.mydomain.com) and ip in /etc/hosts, enable and start chrony, reboot.
(As root user)
dnf install ipa-server bind-dyndb-ldap ipa-server-dns -y
for SERVICES in ntp http https ldap ldaps kerberos kpasswd dns; do firewall-cmd
--permanent --add-service=$SERVICES; done
ipa-server-install --setup-dns
.
.
.
Add one secondary DNS in /etc/NetworkManager/conf.d/zzz-ipa.conf
klist
kinit admin
authselect select sssd with-sudo with-mkhomedir
ipa user-add user3 --first=user3 --last=test --email=user3(a)mydomain.com
--shell=/bin/bash --password
id user3
ipa user-find user3
ssh user3(a)ipaserver.mydomain.com
(change password)
reboot
(As root user)
klist
kinit admin
ipa-advise config-server-for-smart-card-auth >
config-server-for-smart-card-auth.sh
chmod u+x config-server-for-smart-card-auth.sh
./config-server-for-smart-card-auth.sh /etc/ipa/ca.crt
.
.
reboot
ipa-advise config-client-for-smart-card-auth >
/tmp/config-client-for-smart-card-auth.sh
chmod a+r /tmp/config-client-for-smart-card-auth.sh
Work on Fedora 32 workstation:
------------------------------
Install Fedora 32 Workstation from live dvd to PC, update to latest version
(dnf update -y), set hostname, enter server hostname (workstation.mydomain.com)
and ip in /etc/hosts, enable and start chrony.
change/add to /etc/sysconfig/network-scripts/reboot, so IPA server becomes
primary DNS for the Fedora 32 Workstation:
PEERDNS=no
DNS1=<ipa server ip address>
DNS2=<second dns server>
SEARCH=mydomain.comDOMAIN=mydomain.com
Then reboot
Login and check that DNS is working.
(as root user)
dnf install freeipa-client.x86_64 -y
ipa-client-install --mkhomedir
id user3
reboot
Connect gemalto CT700 card reader to pc/Fedora Workstation.
lsusb
dnf install opensc ccid pcsc-tools -y
systemctl enable pcscd
systemctl start pcscd
scp user3@ipaserver:/tmp/config-client-for-smart-card-auth.sh .
chmod +x config-client-for-smart-card-auth.sh
./config-client-for-smart-card-auth.sh /etc/ipa/ca.crt
.
.
.
In /etc/opensc.conf enable pinpad by uncommenting enable_pinpad = true;
Ensure pam_cert_auth is true in sssd.conf:
grep ^pam_cert_auth /etc/sssd/sssd.conf
pam_cert_auth = True
authselect select sssd with-mkhomedir with-sudo with-smartcard
with-smartcard-lock-on-removal --force
authselect current
reboot
2. Prepare smartcard-hsm with user3 certificate using
(as root user)
kinit admin
Insert smartcard-hsm in gemalto ct700 card reader!
pcsc_scan
Using reader plug'n play mechanism
Scanning present readers...
0: Gemalto Ezio Shield (I<some number>) 00 00
Wed Sep 23 14:12:27 2020
Reader 0: Gemalto Ezio Shield (I<some number>) 00 00
.
.
.
Possibly identified card (using /usr/share/pcsc/smartcard_list.txt):
<some hex number>
Smartcard-HSM
http://www.cardcontact.de/products/sc-hsm.html
pensc-tool --list-readers
# Detected readers (pcsc)
Nr. Card Features Name
0 Yes PIN pad Gemalto Ezio Shield (I<some number>) 00 00
pkcs11-tool --list-slots
Available slots:
Slot 0 (0x0): Gemalto Ezio Shield (I<some number>) 00 00
token label : UserPIN (SmartCard-HSM)
token manufacturer : www.CardContact.de
token model : PKCS#15 emulated
token flags : login required, PIN pad present, rng, token initialized,
PIN initialized
hardware version : 24.13
firmware version : 2.5
serial num : DECM<some number>
pin min/max : 6/15
sc-hsm-tool --create-dkek-share dkek-share-1.pbe
.
.
.
sc-hsm-tool --initialize --so-pin <long pincode> --pin <pincode> --dkek-shares
1
sc-hsm-tool
.
.
.
DKEK shares : 1
DKEK import pending, 1 share(s) still missing
sc-hsm-tool --import-dkek-share dkek-share-1.pbe
.
.
.
Enter password to decrypt DKEK share : <pincode>
sc-hsm-tool
.
.
.
DKEK shares : 1
DKEK key check value : <some hex code>
# generate keypair
pkcs11-tool --module opensc-pkcs11.so --login --pin <pincode> --keypairgen
--key-type rsa:2048 --id 10 --label "HSM RSA Key user3"
pkcs11-tool --list-objects
.
.
.
pkcs11-tool --test --login --pin <pincode>
.
.
.
# Backup DKEK
sc-hsm-tool --wrap-key wrap-key-1.bin --key-reference 1 --pin <pincode>
# Extract card public key for slot 10
pkcs15-tool --read-public-key 10 > user3.pub
# Prepping for and Create CSR to sign by IPA for user3
# Create a file hsm.conf with the content below
cat hsm.conf
# PKCS11 engine config
openssl_conf = openssl_def
[openssl_def]
engines = engine_section
[req]
distinguished_name = req_distinguished_name
[req_distinguished_name]
# empty.
[engine_section]
pkcs11 = pkcs11_section
[pkcs11_section]
engine_id = pkcs11
PIN =
init = 0
# Test that hsm.conf is working, and find pkcs11 engine
OPENSSL_CONF=./hsm.conf openssl engine
(rdrand) Intel RDRAND engine
(dynamic) Dynamic engine loading support
(pkcs11) pkcs11 engine
# Create CSR to sign by IPA for user3
OPENSSL_CONF=./hsm.conf openssl req -engine pkcs11 -keyform engine -new -key 10
-sha256 -out user3.csr -subj "/CN=user3"
Login to IPA server using the web interface https://ipaserver.mydomain.com
(this can be performed from command line as well, but we did use the web
interface to IPA)
user user3 Actions -> new certificate
select profile IECuserRoles
copy "user3.csr" from above and paste it in and click "issue" (IPA now sign the
CSR)
To retrieve the signed certificate for user3:
user user3 by Certificates click Actions -> Download and save as. (it downloads
as cert.pem)
Copy the downloaded cerificate (cert.pem) to host with card reader (Fedora 32
Workstation)
Rename it:
mv cert.pem user3.pem
# convert to der format:
openssl x509 -in user3.pem -out user3.der -outform der
# write it to the card in slot 10
pkcs11-tool --module opensc-pkcs11.so --login --pin <pincode> --write-object
user36.der --type cert --id 10
# check that it is there:
pkcs11-tool --list-objects
Using slot 0 with a present token (0x0)
Certificate Object; type = X.509 cert
label: Certificate
subject: DN: O=MYDOMAIN.COM, CN=user3
ID: 10
Public Key Object; RSA 2048 bits
label: Certificate
ID: 10
Usage: encrypt, verify
Smartcard should now be ready for use with IPA.
3. Now try login to workstation.mydomain.com using GDM using the smartcard
issued for user3
Note! user3 password must not have been expired, it should be fixed by the
initial login test above.
As per details above:
1. Fedora 32 Workstation GDM menu prompts a few users that can login.
2. Smartcard is inserted in reader.
3. GDM blanks out the screen and smartcard reader prompts to enter PIN in its
lcd display.
4. Entering pin on smartcard reader followed by pressing ok button on smartcard
reader at getting result Pin OK in reader display.
5. GDM now prompts for entering PIN on keyboard, this is unexpected, instead of
directly being logged in to the window manager, here Gnome (or xfce, whatever
window manager you selected to use).
6. You have to enter the PIN now on keyboard, followed by hitting enter.
7. Once again smartcard reader now prompts for PIN in its lcd display.
8. Entering PIN on the smartcard pinpad reader followed by pressing pinpad ok
button.
9. You are now logged in, and all is normal. If ripping out the smartcard from
reader the screen locks, as expected.
Sometimes, but not always, you are logged in to window manager directly after
step 5.
Actual Results:
You are asked to enter PIN using pinpad on card reader followed by enter PIN
using the keyboard, then you are logged in.
Sometimes you need to enter PIN on pinpad once more after entering PIN using
the keyboard.
Expected Results:
Directly after entering correct PIN using pinpad on card reader you should be
logged in.
Versions:
Fedora32 with latest updates per Oct 9 2020.
freeipa-server-4.8.10-5.fc32.x86_64
freeipa-client-4.8.10-5.fc32.x86_64
sssd-client-2.3.1-2.fc32.x86_64
opensc-0.20.0-6.fc32.x86_64
pcsc-lite-libs-1.9.0-1.fc32.x86_64
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https://bugzilla.redhat.com/show_bug.cgi?id=1857104
Bug ID: 1857104
Summary: Using FreeIPA breaks IPv4/IPv6 flags for SSH
Product: Fedora
Version: 32
Status: NEW
Component: sssd
Assignee: sssd-maintainers(a)lists.fedoraproject.org
Reporter: ossman(a)cendio.se
QA Contact: extras-qa(a)fedoraproject.org
CC: abokovoy(a)redhat.com, atikhono(a)redhat.com,
jhrozek(a)redhat.com, lslebodn(a)redhat.com,
mzidek(a)redhat.com, pbrezina(a)redhat.com,
rharwood(a)redhat.com, sbose(a)redhat.com,
ssorce(a)redhat.com,
sssd-maintainers(a)lists.fedoraproject.org
Target Milestone: ---
Classification: Fedora
Description of problem:
If a client is configured using ipa-client-install then the -4 and -6 flags
stop working for ssh.
Version-Release number of selected component (if applicable):
Doesn't matter. Seen on RHEL 6 through 8, and on current Fedora.
How reproducible:
100%
Steps to Reproduce:
1. ipa-client-install
2. ssh -4 host.example.com
Actual results:
Connected via IPv6
Expected results:
Connected via IPv4
Additional info:
The bug is that sss_ssh_knownhostsproxy is configured on the client and that
command doesn't respect the flags given to ssh.
The issue affects all hosts, not just those part of the same FreeIPA domain.
A practical effect of this is that connections get rejected or misbehave
because of IP based rules in place for this connection.
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https://bugzilla.redhat.com/show_bug.cgi?id=1927907
Bug ID: 1927907
Summary: Latest release sssd 2.4.1 hard requires Python 3
Product: Fedora
Version: 34
Status: NEW
Component: sssd
Assignee: sssd-maintainers(a)lists.fedoraproject.org
Reporter: jlebon(a)redhat.com
QA Contact: extras-qa(a)fedoraproject.org
CC: abokovoy(a)redhat.com, atikhono(a)redhat.com,
jhrozek(a)redhat.com, lslebodn(a)redhat.com,
mzidek(a)redhat.com, pbrezina(a)redhat.com,
rharwood(a)redhat.com, sbose(a)redhat.com,
ssorce(a)redhat.com,
sssd-maintainers(a)lists.fedoraproject.org
Target Milestone: ---
Classification: Fedora
Description of problem:
It seems since the 2.4.1 rebase
(https://src.fedoraproject.org/rpms/sssd/c/9e5dd4b66572aeb348f3cc854ce7fca9f…)
sssd now pulls in python3 because it changed python3-sssdconfig from a
"Suggests" to a "Requires". In Fedora CoreOS, we're trying to avoid shipping
Python entirely to encourage containerizing user workloads and to keep the OS
minimal. In a rawhide and f34 build, this package was identified as pulling it
back in.
Would it be possible to make it a weak dep again? This would also be useful in
other environments like containers and custom OS builds which value minimalism.
We can help with that if there's agreement.
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https://bugzilla.redhat.com/show_bug.cgi?id=1886816
Bug ID: 1886816
Summary: [abrt] sssd-common: sss_mmap_cache_pw_store():
sssd_nss killed by SIGBUS
Product: Fedora
Version: 33
Hardware: x86_64
Status: NEW
Whiteboard: abrt_hash:cd13c552f85949e67c1f8b9066dc4393eee0ce85;VAR
IANT_ID=workstation;
Component: sssd
Assignee: sssd-maintainers(a)lists.fedoraproject.org
Reporter: kparal(a)redhat.com
QA Contact: extras-qa(a)fedoraproject.org
CC: abokovoy(a)redhat.com, atikhono(a)redhat.com,
jhrozek(a)redhat.com, lslebodn(a)redhat.com,
mzidek(a)redhat.com, pbrezina(a)redhat.com,
rharwood(a)redhat.com, sbose(a)redhat.com,
ssorce(a)redhat.com,
sssd-maintainers(a)lists.fedoraproject.org
Target Milestone: ---
Classification: Fedora
Version-Release number of selected component:
sssd-common-2.3.1-4.fc33
Additional info:
reporter: libreport-2.14.0
backtrace_rating: 4
cgroup: 0::/system.slice/sssd.service
cmdline: /usr/libexec/sssd/sssd_nss --uid 0 --gid 0 --logger=files
crash_function: sss_mmap_cache_pw_store
executable: /usr/libexec/sssd/sssd_nss
journald_cursor:
s=b2e7c0583c004ae8bd317a4440255076;i=2ee4a7;b=7c261537394f4d169971a59cd1761dfe;m=55626889;t=5b13c2149d0cf;x=8fed0b78d48ecd6c
kernel: 5.8.14-300.fc33.x86_64
rootdir: /
runlevel: N 5
type: CCpp
uid: 0
Truncated backtrace:
Thread no. 1 (10 frames)
#0 sss_mmap_cache_pw_store at src/responder/nss/nsssrv_mmap_cache.c:769
#1 nss_protocol_fill_pwent at src/responder/nss/nss_protocol_pwent.c:308
#2 nss_protocol_reply at src/responder/nss/nss_protocol.c:91
#3 nss_getby_done at src/responder/nss/nss_cmd.c:626
#4 tevent_common_invoke_immediate_handler at ../../tevent_immediate.c:166
#5 tevent_common_loop_immediate at ../../tevent_immediate.c:203
#6 epoll_event_loop_once at ../../tevent_epoll.c:917
#7 std_event_loop_once at ../../tevent_standard.c:110
#8 _tevent_loop_once at ../../tevent.c:772
#9 tevent_common_loop_wait at ../../tevent.c:895
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https://bugzilla.redhat.com/show_bug.cgi?id=1853261
Bug ID: 1853261
Summary: sssd fails to start on read-only filesystem
Product: Fedora
Version: rawhide
Status: NEW
Component: sssd
Assignee: sssd-maintainers(a)lists.fedoraproject.org
Reporter: zbyszek(a)in.waw.pl
QA Contact: extras-qa(a)fedoraproject.org
CC: abokovoy(a)redhat.com, atikhono(a)redhat.com,
jhrozek(a)redhat.com, lslebodn(a)redhat.com,
mzidek(a)redhat.com, pbrezina(a)redhat.com,
rharwood(a)redhat.com, sbose(a)redhat.com,
ssorce(a)redhat.com,
sssd-maintainers(a)lists.fedoraproject.org
Target Milestone: ---
Classification: Fedora
Description of problem:
sssd refuses to start when /var/log is read-only. It is obviously a problem
when trying to recover
from a file system issue. Since logging is non-essential, sssd should just
continue. At most is
should emit a warning.
$ touch /var/tmp/foo
touch: cannot touch '/var/tmp/foo': Read-only file system
$ sudo systemctl start sssd.service
Job for sssd.service failed because the control process exited with error code.
See "systemctl status sssd.service" and "journalctl -xe" for details.
[fedora@workstation-uefi ~]$
Broadcast message from systemd-journald@workstation-uefi (Thu 2020-07-02
11:16:46 CEST):
sssd[900]: Could not open file [/var/log/sssd/sssd.log]. Error: [30][Read-only
file system]
Broadcast message from systemd-journald@workstation-uefi (Thu 2020-07-02
11:16:47 CEST):
sssd[903]: Could not open file [/var/log/sssd/sssd.log]. Error: [30][Read-only
file system]
Broadcast message from systemd-journald@workstation-uefi (Thu 2020-07-02
11:16:47 CEST):
sssd[905]: Could not open file [/var/log/sssd/sssd.log]. Error: [30][Read-only
file system]
Broadcast message from systemd-journald@workstation-uefi (Thu 2020-07-02
11:16:47 CEST):
sssd[906]: Could not open file [/var/log/sssd/sssd.log]. Error: [30][Read-only
file system]
Broadcast message from systemd-journald@workstation-uefi (Thu 2020-07-02
11:16:47 CEST):
sssd[907]: Could not open file [/var/log/sssd/sssd.log]. Error: [30][Read-only
file system]
We see multiple issues here:
- the main one is that sssd should not fail to start as described above
- but also, why is sssd not just logging to the journal? Why is it spamming
with broadcast messages?
If sssd would just log to the journal like any modern service, all those
problems
would be avoided.
Version-Release number of selected component (if applicable):
sssd-2.3.0-2.fc33.x86_64
How reproducible:
Deterministic
Steps to Reproduce:
1. Make /var/log read-only, either by not remounting the filesystems rw, or by
using udev.blockdev-read-only with systemd-246+
2. Try to start sssd
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https://bugzilla.redhat.com/show_bug.cgi?id=1868696
Bug ID: 1868696
Summary: sssd_kcm loops on NFS server occasionally after an
NFSv4.0 mount using Kerberos
Product: Fedora
Version: 32
Hardware: All
OS: Linux
Status: NEW
Component: sssd
Severity: high
Assignee: sssd-maintainers(a)lists.fedoraproject.org
Reporter: chuck.lever(a)oracle.com
QA Contact: extras-qa(a)fedoraproject.org
CC: abokovoy(a)redhat.com, atikhono(a)redhat.com,
jhrozek(a)redhat.com, lslebodn(a)redhat.com,
mzidek(a)redhat.com, pbrezina(a)redhat.com,
rharwood(a)redhat.com, sbose(a)redhat.com,
ssorce(a)redhat.com,
sssd-maintainers(a)lists.fedoraproject.org
Target Milestone: ---
Classification: Fedora
Description of problem:
Multi-homed Fedora 32 NFS client and server, both with keytabs. Sometimes after
performing an NFSv4.0 mount, the sssd_kcm daemon on the server runs at 100% and
fills up the sssd_kcm.log file (and eventually, the root partition).
(2020-08-10 15:03:04:680265): [kcm] [kcm_input_parse] (0x1000): Received
message with length 0
(2020-08-10 15:03:04:680284): [kcm] [kcm_input_parse] (0x0020): Illegal
zero-length message
(2020-08-10 15:03:04:680302): [kcm] [kcm_recv] (0x0010): Failed to parse
data (74, Bad message), aborting client
(2020-08-10 15:03:04:680319): [kcm] [kcm_reply_error] (0x0040): KCM
operation returs failure [74]: Bad message
(2020-08-10 15:03:04:680353): [kcm] [kcm_failbuf_construct] (0x1000): Sent
reply with error -1765328188
Version-Release number of selected component (if applicable):
sssd-kcm-2.3.1-2.fc32.x86_64
How reproducible:
Happens every second or third mount operation.
Steps to Reproduce:
1. Set up NFS client and server with keytabs
2. Repeat: "mount -o vers=4.0,sec=sys" / do some operations / umount
3. Watch the server with "top"
Actual results:
Sometimes sssd_kcm goes to 100% of a CPU and must be killed.
Expected results:
No looping.
Additional info:
The NFSv4.0 backchannel, in this case, is secured with GSS krb5i. It appears
that gssd on the server is accessing the Kerberos ticket cache while setting up
the backchannel, and sometimes this triggers the kcm loop.
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https://bugzilla.redhat.com/show_bug.cgi?id=1884912
Bug ID: 1884912
Summary: [abrt] sssd-common: __strcmp_avx2(): sssd_be killed by
SIGSEGV
Product: Fedora
Version: 32
Hardware: x86_64
Status: NEW
Whiteboard: abrt_hash:a07038fd78acc47fd66b266203cafebd50509e00;VAR
IANT_ID=workstation;
Component: sssd
Assignee: sssd-maintainers(a)lists.fedoraproject.org
Reporter: rbrattai(a)redhat.com
QA Contact: extras-qa(a)fedoraproject.org
CC: abokovoy(a)redhat.com, atikhono(a)redhat.com,
jhrozek(a)redhat.com, lslebodn(a)redhat.com,
mzidek(a)redhat.com, pbrezina(a)redhat.com,
rharwood(a)redhat.com, sbose(a)redhat.com,
ssorce(a)redhat.com
Target Milestone: ---
Group: fedora_contrib_private
Classification: Fedora
Description of problem:
Always happens when the Kerberos tickets expire after letting the system sit
overnight.
Log in to Redhat krbtgt/REDHAT.COM(a)REDHAT.COM
let the system sit overnight, or until ticket expires
try to login via gdm or vt
login fails
Version-Release number of selected component:
sssd-common-2.3.1-2.fc32
Additional info:
reporter: libreport-2.13.1
backtrace_rating: 4
cgroup: 0::/system.slice/sssd.service
cmdline: /usr/libexec/sssd/sssd_be --domain redhat.com --uid 0 --gid 0
--logger=files
crash_function: __strcmp_avx2
executable: /usr/libexec/sssd/sssd_be
journald_cursor:
s=a7dff00ea3904bcf94e9c47f3af11249;i=99168;b=d69fa027bac74e0c82bae802fce15dc2;m=8e9b12f6b4;t=5b0c43dd4cdcb;x=5af4a1ece75efc5a
kernel: 5.7.17-200.fc32.x86_64
rootdir: /
runlevel: N 5
type: CCpp
uid: 0
Truncated backtrace:
Thread no. 1 (10 frames)
#0 __strcmp_avx2 at ../sysdeps/x86_64/multiarch/strcmp-avx2.S:101
#1 be_resolve_server_process at src/providers/data_provider_fo.c:671
#2 be_resolve_server_done at src/providers/data_provider_fo.c:555
#3 fo_resolve_service_server at src/providers/fail_over.c:1165
#4 _tevent_req_error at ../../tevent_req.c:211
#5 resolve_srv_done at src/providers/fail_over.c:1466
#6 fo_discover_srv_done at src/providers/fail_over_srv.c:141
#7 resolv_discover_srv_done at src/resolv/async_resolv_utils.c:302
#8 resolv_getsrv_done at src/resolv/async_resolv.c:1762
#9 qcallback at /usr/src/debug/c-ares-1.15.0-5.fc32.x86_64/ares_query.c:183
Potential duplicate: bug 1773488
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https://bugzilla.redhat.com/show_bug.cgi?id=1910169
Bug ID: 1910169
Summary: sssd-kcm causing periodic auth failures after 2.4.0-2
Product: Fedora
Version: 33
Status: NEW
Component: sssd
Assignee: sssd-maintainers(a)lists.fedoraproject.org
Reporter: rwf(a)loonybin.net
QA Contact: extras-qa(a)fedoraproject.org
CC: abokovoy(a)redhat.com, atikhono(a)redhat.com,
jhrozek(a)redhat.com, lslebodn(a)redhat.com,
mzidek(a)redhat.com, pbrezina(a)redhat.com,
rharwood(a)redhat.com, sbose(a)redhat.com,
ssorce(a)redhat.com,
sssd-maintainers(a)lists.fedoraproject.org
Target Milestone: ---
Classification: Fedora
sssd-kcm is causing periodic auth failures on builds newer than 2.4.0-2,
presumably due to an issue introduced with the (surprising number of) patches
applied in 2.4.0-3. (Incidentally, CPU usage by the process has gotten
substantially worse in these versions, as well.)
This manifests as all plaintext auth failing on Fedora 33 systems running sssd
2.4.0-4, joined to a FreeIPA domain and authenticating domain users, which will
emit errors like the following examples for the lifetime of the sssd-kcm
process that incurred the problem:
Dec 22 17:59:11 fedora33 systemd[1]: Starting SSSD Kerberos Cache Manager...
Dec 22 17:59:11 fedora33 systemd[1]: Started SSSD Kerberos Cache Manager.
Dec 22 17:59:11 fedora33 audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295
ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=sssd-kcm
comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=?
res=success'
Dec 22 17:59:11 fedora33 kcm[10556]: Starting up
Dec 22 17:59:11 fedora33 krb5_child[10554][10554]: Generic error (see e-text)
Dec 22 17:59:11 fedora33 krb5_child[10554][10554]: Generic error (see e-text)
Dec 22 17:59:11 fedora33 auth[10552]: pam_sss(dovecot:auth): authentication
failure; logname= uid=97 euid=97 tty=dovecot ruser=rob rhost=2001:db8::1
user=rob
Dec 22 17:59:11 fedora33 auth[10552]: pam_sss(dovecot:auth): received for user
rob: 4 (System error)
Dec 22 17:59:19 fedora33 krb5_child[10559][10559]: Generic error (see e-text)
Dec 22 17:59:19 fedora33 krb5_child[10559][10559]: Generic error (see e-text)
Dec 22 17:59:19 fedora33 auth[10552]: pam_sss(dovecot:auth): authentication
failure; logname= uid=97 euid=97 tty=dovecot ruser=rob rhost=2001:db8::1
user=rob
Dec 22 17:59:19 fedora33 auth[10552]: pam_sss(dovecot:auth): received for user
rob: 4 (System error)
Dec 22 17:59:29 fedora33 krb5_child[10562][10562]: Generic error (see e-text)
Dec 22 17:59:29 fedora33 krb5_child[10562][10562]: Generic error (see e-text)
Dec 22 17:59:29 fedora33 auth[10552]: pam_sss(dovecot:auth): authentication
failure; logname= uid=97 euid=97 tty=dovecot ruser=rob rhost=2001:db8::1
user=rob
Dec 22 17:59:29 fedora33 auth[10552]: pam_sss(dovecot:auth): received for user
rob: 4 (System error)
Nothing else is logged anywhere. Also affected are sudo and the like, but not
any authentication using Kerberos tickets. Relatively short-lived workarounds
include waiting it out (sssd-kcm process exits, next auth attempt spawns a new
one and succeeds) or rebooting the host. klist as affected users during these
events reports no KCM cache for the respective UID available, and kinit also
usually fails with the same 'Generic error' text until the sssd-kcm process
goes away. Downgrading sssd* packages to 2.4.0-2 restores correct behavior.
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https://bugzilla.redhat.com/show_bug.cgi?id=1676961
--- Comment #8 from Sumit Bose <sbose(a)redhat.com> ---
Hi,
thanks for explaining your use case. I would recommend to use auditd do record
which user is doing what with sudo, see e.g.
https://sudoedit.com/log-sudo-with-auditd/.
As an example. If I set
sudo auditctl -a exit,always -F arch=b64 -F euid=0 -F
path=/usr/sbin/sss_cache -S execve -k sudo_audit
and a user with UID 1000 then calls
date ; sudo sss_cache -E
Thu Feb 25 14:59:56 UTC 2021
then the administrator can later call
sudo ausearch -ua vagrant -k sudo_audit -x /usr/sbin/sss_cache
time->Thu Feb 25 14:59:56 2021
type=PROCTITLE msg=audit(1614265196.620:5737):
proctitle=7373735F6361636865002D45
type=PATH msg=audit(1614265196.620:5737): item=1
name="/lib64/ld-linux-x86-64.so.2" inode=153852 dev=fd:01 mode=0100755 ouid=0
ogid=0 rdev=00:00 obj=system_u:object_r:ld_so_t:s0 nametype=NORMAL cap_fp=0
cap_fi=0 cap_fe=0 cap_fver=0 cap_frootid=0
type=PATH msg=audit(1614265196.620:5737): item=0 name="/sbin/sss_cache"
inode=606020 dev=fd:01 mode=0104555 ouid=0 ogid=0 rdev=00:00
obj=system_u:object_r:bin_t:s0 nametype=NORMAL cap_fp=0 cap_fi=0 cap_fe=0
cap_fver=0 cap_frootid=0
type=CWD msg=audit(1614265196.620:5737): cwd="/home/vagrant"
type=EXECVE msg=audit(1614265196.620:5737): argc=2 a0="sss_cache" a1="-E"
type=SYSCALL msg=audit(1614265196.620:5737): arch=c000003e syscall=59
success=yes exit=0 a0=561aea8a88b8 a1=561aea8b0178 a2=561aea8c7160 a3=1 items=2
ppid=59080 pid=59082 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0
fsgid=0 tty=pts0 ses=1 comm="sss_cache" exe="/usr/sbin/sss_cache"
subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key="sudo_audit"
So you get full path of the command with options, execution time and
'auid=1000'
If you prefer to do this manually in scripts you can check /proc/self/loginuid,
e.g.
sudo cat /proc/self/loginuid
1000
I hope one of this will work for you.
bye,
Sumit
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--- Comment #7 from Thomas Walker Lynch <thomas.walker.lynch(a)gmail.com> ---
to be more clear, to write programs to help users do system tasks, where the
knowledge of who the user is is required. That is why there is an inherited
uid in addition to the effective uid. There are workarounds, such as passing
identifying information through the environment, but those work arounds are not
secure, because, unlike the inherited uid, the environment may be spoofed. ..
that is why the inherited uid and such identification is handled by the OS
instead of the application layer, but sudo is currently defeating this
mechanism. And thus, indeed, I do believe it is a bug.
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