Текущие SSH-подключения

Несколько способов мониторинга пользователей, подключённых по SSH в режиме реального времени.

С помощью netstat

# netstat -tnpa | grep "ESTABLISHED.*sshd"
tcp  0   64 172.16.32.178:22    172.16.3.22:50915     ESTABLISHED 23897/sshd: user1
tcp  0    0 172.16.32.178:22    172.16.3.22:49345     ESTABLISHED 23168/sshd: user1
tcp  0    0 172.16.32.178:22    172.16.33.200:59452   ESTABLISHED 1597/sshd: user1

С помощью lsof

# lsof -n -a -itcp -stcp:established -c sshd
COMMAND   PID      USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
sshd     1597      root    3u  IPv4  29944      0t0  TCP 172.16.32.178:ssh->172.16.33.200:59452 (ESTABLISHED)
sshd     1603     user1    3u  IPv4  29944      0t0  TCP 172.16.32.178:ssh->172.16.33.200:59452 (ESTABLISHED)
sshd    23168      root    3u  IPv4 176479      0t0  TCP 172.16.32.178:ssh->172.16.3.22:49345 (ESTABLISHED)
sshd    23170     user1    3u  IPv4 176479      0t0  TCP 172.16.32.178:ssh->172.16.3.22:49345 (ESTABLISHED)
sshd    23897      root    3u  IPv4 179696      0t0  TCP 172.16.32.178:ssh->172.16.3.22:50915 (ESTABLISHED)
sshd    23906     user1    3u  IPv4 179696      0t0  TCP 172.16.32.178:ssh->172.16.3.22:50915 (ESTABLISHED)

С помощью ss

# ss -o state established '( dport = :ssh or sport = :ssh )'
Netid  Recv-Q Send-Q   Local Address:Port    Peer Address:Port
tcp    0      0        172.16.32.178:ssh     172.16.3.22:50915   timer:(keepalive,118min,0)
tcp    0      0        172.16.32.178:ssh     172.16.3.22:49345   timer:(keepalive,61min,0)
tcp    0      0        172.16.32.178:ssh   172.16.33.200:59452   timer:(keepalive,53sec,0)

С помощью w

# w
 22:55:40 up 1 day, 13:51,  3 users,  load average: 0,00, 0,00, 0,00
USER   TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
user1  pts/0    172.16.3.22      21:57   43:16   0.10s  0.04s sshd: user1 [priv]
user1  pts/1    172.16.33.200    Вт04    1:17m   0.09s  0.20s sshd: user1 [priv]
user1  pts/2    172.16.3.22      22:54   0.00s   0.08s  0.04s sshd: user1 [priv]

С помощью who

# who
user1 pts/0    2022-10-05 21:57 (172.16.3.22)
user1 pts/1    2022-10-04 10:56 (172.16.33.200)
user1 pts/2    2022-10-05 22:54 (172.16.3.22)

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