linux - nagios 和 ubuntu ssh 身份验证

Question

我有一个必须检查 2 个其他 jboss 服务器的 nagios 服务器。我有一个检查文件夹大小的脚本。

我在 nagios 2 规则中通过 nagios 的“check_by_ssh”命令检查这个 jboss 服务器中的一些文件夹

如果我以 nagios 用户身份从 shell 执行命令，我会从两个 jboss 服务器得到答案

./check_by_ssh -H server1 -t 60 -l nagios -C "/opt/jboss/scripts/check_file_size_mizar.sh --maxwarn 80000000 --maxcrit 150000000/opt/jboss/domain/servers//log//opt/jboss/domain/log/*"-E

./check_by_ssh -H server2 -t 60 -l nagios -C "/opt/jboss/scripts/check_file_size_mizar.sh --maxwarn 80000000 --maxcrit 150000000/opt/jboss/domain/servers//log//opt/jboss/domain/log/*"-E

但是当nagios执行同样的命令时，server1返回正确的结果，server2返回

(Return code of 255 is out of bounds : UNKNOWN - check_by_ssh: Remote command '/opt/jboss/scripts/check_file_size.sh --maxwarn 80000000 --maxcrit 150000000 /opt/jboss/domain/servers/*/log/* /opt/jboss/domain/log/*' returned status 255))

我认为问题出在 ssh 身份验证中。

我检查了服务器用户 nagios .ssh 文件夹权限和内容

我在两个 jboss 服务器上调试 ssh 恶魔，我得到了这个结果

SERVER1:/etc/ssh$ sudo /usr/sbin/sshd -d
debug1: sshd version OpenSSH_5.9p1 Debian-5ubuntu1
debug1: read PEM private key done: type RSA
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: private host key: #0 type 1 RSA
debug1: read PEM private key done: type DSA
debug1: Checking blacklist file /usr/share/ssh/blacklist.DSA-1024
debug1: Checking blacklist file /etc/ssh/blacklist.DSA-1024
debug1: private host key: #1 type 2 DSA
debug1: read PEM private key done: type ECDSA
debug1: Checking blacklist file /usr/share/ssh/blacklist.ECDSA-256
debug1: Checking blacklist file /etc/ssh/blacklist.ECDSA-256
debug1: private host key: #2 type 3 ECDSA
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-d'
Set /proc/self/oom_score_adj from 0 to -1000
debug1: Bind to port 22 on 0.0.0.0.
Server listening on 0.0.0.0 port 22.
debug1: Bind to port 22 on ::.
Server listening on :: port 22.
debug1: Server will not fork when running in debugging mode.
debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
debug1: inetd sockets after dupping: 3, 3
Connection from SERVERIP port 44578


debug1: Client protocol version 2.0; client software version OpenSSH_5.9p1 Debian-5ubuntu1
debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1
debug1: permanently_set_uid: 105/65534 [preauth]
debug1: list_hostkey_types: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256 [preauth]
debug1: SSH2_MSG_KEXINIT sent [preauth]
debug1: SSH2_MSG_KEXINIT received [preauth]
debug1: kex: client->server aes128-ctr hmac-md5 none [preauth]
debug1: kex: server->client aes128-ctr hmac-md5 none [preauth]
debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
debug1: SSH2_MSG_NEWKEYS sent [preauth]
debug1: expecting SSH2_MSG_NEWKEYS [preauth]

debug1: SSH2_MSG_NEWKEYS received [preauth]
debug1: KEX done [preauth]
debug1: userauth-request for user nagios service ssh-connection method none [preauth]
debug1: attempt 0 failures 0 [preauth]
debug1: PAM: initializing for "nagios"
debug1: PAM: setting PAM_RHOST to "domain.x.y"
debug1: PAM: setting PAM_TTY to "ssh"
debug1: userauth-request for user nagios service ssh-connection method publickey [preauth]
debug1: attempt 1 failures 0 [preauth]
debug1: test whether pkalg/pkblob are acceptable [preauth]
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: temporarily_use_uid: 1002/1002 (e=0/0)
debug1: trying public key file /home/nagios/.ssh/authorized_keys
debug1: fd 7 clearing O_NONBLOCK
debug1: matching key found: file /home/nagios/.ssh/authorized_keys, line 1
Found matching RSA key: ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ
debug1: restore_uid: 0/0
Postponed publickey for nagios from SERVERIP port 44578 ssh2 [preauth]
debug1: userauth-request for user nagios service ssh-connection method publickey [preauth]
debug1: attempt 2 failures 0 [preauth]
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: temporarily_use_uid: 1002/1002 (e=0/0)
debug1: trying public key file /home/nagios/.ssh/authorized_keys
debug1: fd 7 clearing O_NONBLOCK
debug1: matching key found: file /home/nagios/.ssh/authorized_keys, line 1
Found matching RSA key: ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ:ZZ
debug1: restore_uid: 0/0
debug1: ssh_rsa_verify: signature correct
debug1: do_pam_account: called
Accepted publickey for nagios from SERVERIP port 44578 ssh2
debug1: monitor_read_log: child log fd closed
debug1: monitor_child_preauth: nagios has been authenticated by privileged process
debug1: temporarily_use_uid: 1002/1002 (e=0/0)
debug1: ssh_gssapi_storecreds: Not a GSSAPI mechanism
debug1: restore_uid: 0/0
debug1: PAM: establishing credentials
User child is on pid 4485
debug1: SELinux support disabled
debug1: PAM: establishing credentials
debug1: permanently_set_uid: 1002/1002
debug1: Entering interactive session for SSH2.
debug1: server_init_dispatch_20
debug1: server_input_channel_open: ctype session rchan 0 win 2097152 max 32768
debug1: input_session_request
debug1: channel 0: new [server-session]
debug1: session_new: session 0
debug1: session_open: channel 0
debug1: session_open: session 0: link with channel 0
debug1: server_input_channel_open: confirm session
debug1: server_input_global_request: rtype no-more-sessions@openssh.com want_reply 0
debug1: server_input_channel_req: channel 0 request env reply 0
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req env
debug1: server_input_channel_req: channel 0 request env reply 0
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req env
debug1: server_input_channel_req: channel 0 request exec reply 1
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req exec
debug1: Received SIGCHLD.
debug1: session_by_pid: pid 4486
debug1: session_exit_message: session 0 channel 0 pid 4486
debug1: session_exit_message: release channel 0
Received disconnect from SERVERIP: 11: disconnected by user
debug1: do_cleanup
debug1: do_cleanup
debug1: PAM: cleanup
debug1: PAM: closing session
debug1: PAM: deleting credentials

和

SERVER2:/etc/ssh$ sudo /usr/sbin/sshd -d
debug1: sshd version OpenSSH_5.9p1 Debian-5ubuntu1.4
debug1: read PEM private key done: type RSA
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: private host key: #0 type 1 RSA
debug1: read PEM private key done: type DSA
debug1: Checking blacklist file /usr/share/ssh/blacklist.DSA-1024
debug1: Checking blacklist file /etc/ssh/blacklist.DSA-1024
debug1: private host key: #1 type 2 DSA
debug1: read PEM private key done: type ECDSA
debug1: Checking blacklist file /usr/share/ssh/blacklist.ECDSA-256
debug1: Checking blacklist file /etc/ssh/blacklist.ECDSA-256
debug1: private host key: #2 type 3 ECDSA
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-d'
Set /proc/self/oom_score_adj from 0 to -1000
debug1: Bind to port 22 on 0.0.0.0.
Server listening on 0.0.0.0 port 22.
debug1: Bind to port 22 on ::.
Server listening on :: port 22.
debug1: Server will not fork when running in debugging mode.
debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
debug1: inetd sockets after dupping: 3, 3
Connection from SERVERIP port 49791


debug1: Client protocol version 2.0; client software version OpenSSH_5.9p1 Debian-5ubuntu1
debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1.4
debug1: permanently_set_uid: 105/65534 [preauth]
debug1: list_hostkey_types: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256 [preauth]
debug1: SSH2_MSG_KEXINIT sent [preauth]
debug1: SSH2_MSG_KEXINIT received [preauth]
debug1: kex: client->server aes128-ctr hmac-md5 none [preauth]
debug1: kex: server->client aes128-ctr hmac-md5 none [preauth]
debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
debug1: SSH2_MSG_NEWKEYS sent [preauth]
debug1: expecting SSH2_MSG_NEWKEYS [preauth]

Connection closed by SERVERIP [preauth]
debug1: do_cleanup [preauth]
debug1: do_cleanup

您可以看到在服务器 2 中，当 nagios 执行命令时身份验证过程不起作用，但是如果我从用户 nagios 从 nagios 服务器 shell 执行命令，两个服务器都会响应。

对于 server2，两种类型的调用(来自 nagios 服务器 shell 和 nagios 守护进程)之间存在差异。

哪里出了问题，我必须检查哪里？

提前致谢

Answer 1

在两台客户端机器上尝试这个命令

sudo chmod 777 /opt/jboss/scripts/check_file_size.sh