Public bug reported:
I am using AppArmor 2.12-4ubuntu5 on Ubuntu 18.04/bionic.
I have the usr.bin.man profile enforced, and home directories in NFS.
The log excerpt copied below is the result of a single invocation of
"man ls" by an unprivileged user. (The program did display the man page
correctly to the user.)
It does not seem appropriate for AppArmor to report the man(1) program
as having attempted to contact the NFS server directly, when it only
tried to access an NFS-served file in the normal way. "man" is not a
network-aware program and the log below misleadingly implies otherwise.
----------------
Jul 30 17:38:35 darkstar kernel: [69963.052243] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.052274] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.052297] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.052314] kauditd_printk_skb: 34
callbacks suppressed
Jul 30 17:38:35 darkstar kernel: [69963.052316] audit: type=1400
audit(1532986715.854:214): apparmor="DENIED" operation="sendmsg"
profile="/usr/bin/man" pid=2781 comm="man" laddr=X.X.X.X lport=719
faddr=Y.Y.Y.Y fport=2049 family="inet" sock_type="stream" protocol=6
requested_mask="send" denied_mask="send"
Jul 30 17:38:35 darkstar kernel: [69963.052323] audit: type=1400
audit(1532986715.854:215): apparmor="DENIED" operation="sendmsg"
profile="/usr/bin/man" pid=2781 comm="man" laddr=X.X.X.X lport=802
faddr=10.24.115.84 fport=2049 family="inet" sock_type="stream" protocol=6
requested_mask="send" denied_mask="send"
Jul 30 17:38:35 darkstar kernel: [69963.052327] audit: type=1400
audit(1532986715.854:216): apparmor="DENIED" operation="sendmsg"
profile="/usr/bin/man" pid=2781 comm="man" laddr=X.X.X.X lport=719
faddr=Y.Y.Y.Y fport=2049 family="inet" sock_type="stream" protocol=6
requested_mask="send" denied_mask="send"
Jul 30 17:38:35 darkstar kernel: [69963.052339] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.052363] audit: type=1400
audit(1532986715.854:217): apparmor="DENIED" operation="sendmsg"
profile="/usr/bin/man" pid=2781 comm="man" laddr=X.X.X.X lport=719
faddr=Y.Y.Y.Y fport=2049 family="inet" sock_type="stream" protocol=6
requested_mask="send" denied_mask="send"
Jul 30 17:38:35 darkstar kernel: [69963.052364] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.052369] audit: type=1400
audit(1532986715.854:218): apparmor="DENIED" operation="sendmsg"
profile="/usr/bin/man" pid=2781 comm="man" laddr=X.X.X.X lport=802
faddr=10.24.115.84 fport=2049 family="inet" sock_type="stream" protocol=6
requested_mask="send" denied_mask="send"
Jul 30 17:38:35 darkstar kernel: [69963.052386] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.052450] audit: type=1400
audit(1532986715.854:219): apparmor="DENIED" operation="sendmsg"
profile="/usr/bin/man" pid=2781 comm="man" laddr=X.X.X.X lport=719
faddr=Y.Y.Y.Y fport=2049 family="inet" sock_type="stream" protocol=6
requested_mask="send" denied_mask="send"
Jul 30 17:38:35 darkstar kernel: [69963.059570] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.059640] audit: type=1400
audit(1532986715.862:220): apparmor="DENIED" operation="sendmsg"
profile="/usr/bin/man" pid=2781 comm="man" laddr=X.X.X.X lport=719
faddr=Y.Y.Y.Y fport=2049 family="inet" sock_type="stream" protocol=6
requested_mask="send" denied_mask="send"
Jul 30 17:38:35 darkstar kernel: [69963.061907] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.061925] audit: type=1400
audit(1532986715.862:221): apparmor="DENIED" operation="sendmsg"
profile="/usr/bin/man" pid=2792 comm="less" laddr=X.X.X.X lport=719
faddr=Y.Y.Y.Y fport=2049 family="inet" sock_type="stream" protocol=6
requested_mask="send" denied_mask="send"
Jul 30 17:38:35 darkstar kernel: [69963.062006] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.062014] audit: type=1400
audit(1532986715.862:222): apparmor="DENIED" operation="sendmsg"
profile="/usr/bin/man" pid=2792 comm="less" laddr=X.X.X.X lport=719
faddr=Y.Y.Y.Y fport=2049 family="inet" sock_type="stream" protocol=6
requested_mask="send" denied_mask="send"
Jul 30 17:38:35 darkstar kernel: [69963.066404] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.066434] audit: type=1400
audit(1532986715.866:223): apparmor="DENIED" operation="sendmsg"
profile="/usr/bin/man" pid=2788 comm="man" laddr=X.X.X.X lport=719
faddr=Y.Y.Y.Y fport=2049 family="inet" sock_type="stream" protocol=6
requested_mask="send" denied_mask="send"
Jul 30 17:38:35 darkstar kernel: [69963.066437] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.066462] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.067504] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.067535] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.067548] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.067560] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.067590] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.067622] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.068322] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.068338] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.068454] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.068493] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.068525] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.068704] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.068733] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.068754] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.091164] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.092624] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.092822] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.093069] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.093162] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.093926] nfs: RPC call returned error 13
Jul 30 17:38:35 darkstar kernel: [69963.094128] nfs: RPC call returned error 13
** Affects: apparmor (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1784499
Title:
AppArmor treats regular NFS file access as network op
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