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[ssh] 靽格 sshd 閮剖 ,閮剖瑼 /etc/ssh/sshd_config

[銴鋆賡包
頝唾唳摰璅撅
璅銝
潸” 2015-12-28 10:28:36 | 芰閰脖 撣 |摨閬 |梯璅∪
vi /etc/ssh/sshd_config
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5 X. f  d8 Q6 M9 K3 N. W1.靽格寥閮 port (舐典銵憭 port)
* S. O$ O! A9 V9 a5 x+ nPort <port>- t( w' u# w  p1 B
- u$ {" w- t; {. o7 Z
2.賜孵 ip (拍冽澆蝬脣/憭 IP 敶)3 u! ^  H+ P, ^) M; ~8 W
ListenAddress 192.168.1.10
2 S2 m2 I( l5 M! |# C0 b
" Z: ^! i. Z. k- e0 |- U3.蝳甇 root 餃) P& ~( O* q' E7 a! {
PermitRootLogin no
3 `) J! b. r+ O1 l6 b蝞∠敹隞亙鈭箏董餃伐 su root嚗拍 sudo 撌乩$ B! U: V$ G- m* r
2 ]: g9 A0 m8 M0 }  s5 j, ~
4.蝳甇V蝙函征撖蝣潛餃
& b/ e0 m1 ^0 _PermitEmptyPasswords no9 q! y( @: \8 n- o; c9 ?# q
1 G. D1 Q  d$ N7 a* q7 Z
5.閮望蝯孵撣唾蝢斤餃
8 b8 u5 x1 ~3 i& s/ tAllowUsers <user1> <user2> <user3>  _. e6 h+ n6 a1 ?3 B
AllowGroups <group>0 F- ?! N  y, y) D5 A
DenyUsers *
, ~  a  f" c" V$ L: |, E7 [) `# [DenyGroups no-ssh- L% H2 N; t* b; E. y, P2 z0 n. n$ ]
寞撖阡嚗撠澆銝撣唾閮嚗憒 Allow 頝 Deny 閰梧蝯 Deny
( y# n% i: u$ O# ^% I; b4 Y. B) l/ y0 D5 E
6.撱a文蝣潛駁嚗撘瑁翰雿輻 RSA/DSA 撽霅1 o  J" w- a2 A# I
RSAAuthentication yes
$ U9 A: G! C# O. M) H: T0 N, YPubkeyAuthentication yes* t& ~1 q3 u6 S% B8 R' P
AuthorizedKeysFile %h/.ssh/authorized_keys
' g3 h: n8 L# p9 p' s4 L( dPasswordAuthentication no2 c2 a- F- L6 B3 l
銝衣Ⅱ靽 user ~/.ssh 甈 700嚗撠閰 user public key 亙 ~/.ssh/authorized_keys 銝准Public key Y孵舀撠 ssh-keygen% k6 X& t" c3 q; p( a# Q
$ {2 y& \' y/ u# D: b' h
7.閮 SSHv2# \) k; o) P  z) k; U5 n
Protocol 2" x$ x9 k1 Z: R! }
% ^" F$ V4 p) ?8 I
8.嗥孵雿輻刻蝢斤銝餅雿餃亥綽鋆∩誑 somebody handsomebody 銝臭蝙典蝣潛餃亦箔
, X% C% N3 a: h2 jMatch User somebody,handsomebody
& G5 ]' c9 h7 f4 _) KPasswordAuthentication no雿輻 TCP wrappers 嗡皞 IP% j$ J2 k% W/ @# ?0 p
# vim /etc/hosts.deny5 E( H, u2 a" N3 p: B5 \
sshd: ALL8 m$ d: u( _; j5 p: `/ w6 _+ P' j
# vim /etc/hosts.allow
! ]7 M$ P1 P1 N: Z5 o+ S% t, W4 csshd: 192.168.1 1.2.3.4 # 閮 192.168.1.* 1.2.3.4 蝺
9 Q: i- V3 X, C( s+ L  z% a* Y) w6 S; x$ o0 [5 \% l) {. p
9.雿輻 iptables 嗡皞 IP, o# O1 E& G3 _( |' W+ _
# iptables -A INPUT -p tcp -m state --state NEW --source 1.2.3.4 --dport 22 -j ACCEPT
; w/ p& f0 ^9 D& I; y# iptables -A INPUT -p tcp --dport 22 -j DROP) i5 o; d+ X" ]+ \) ~, M, Y$ b; y2 e
閮剖蝡喟嚗亙璈敺賭摮嚗閬脣 iptables 閮剖5 s6 ?, r' q; y/ _5 w, s
: I5 R- Y& s% P
10.摰
: Q6 a0 K5 w/ p/ H" W/ p% d0 ?雿臭誑雿輻其iptables訾嗅訕SH伐霈嗅其孵蝭批臭誑伐嗡銝賡乓雿臭誑其Y隞颱靘摮銝凋蝙 /second/minute/hour /day 5 A2 H6 @) Y: U3 u7 n0 T3 P, B: x
蝚砌靘摮嚗憒銝冽嗉撓乩航炊撖蝣潘摰銝找閮勗刻赤SSH嚗璅瘥冽嗅其批芾賢閰虫甈∠駁
7 Z& N$ q! @- v# S  # iptables -A INPUT -p tcp -m state --syn --state NEW --dport 22 -m limit --limit 1/minute --limit-burst 1 -j ACCEPT; g: o7 {: L  {! D" D
  # iptables -A INPUT -p tcp -m state --syn --state NEW --dport 22 -j DROP
3 t* e* N* p7 a. a, @" K蝚砌靘摮嚗閮剔蔭iptables芸閮曹蜓璈193.180.177.13亙訕SH嚗典閰虫甈∪仃駁詨嚗iptables閮梯府銝餅瘥閰虫甈∠駁
# u5 |7 h$ i5 |/ q  # iptables -A INPUT -p tcp -s 193.180.177.13 -m state --syn --state NEW --dport 22 -m limit --limit 1/minute --limit-burst 1 -j ACCEPT# f9 K  U; }* w8 T% `  `  F" r
  # iptables -A INPUT -p tcp -s 193.180.177.13 -m state --syn --state NEW --dport 22 -j DROP
0 X5 J5 p9 i2 F; ~
9 `2 [  r/ s+ J11.瑼X亦賊瑼獢甈嚗銝摰典銝閮梁餃( G2 G0 m; q4 e0 P2 t/ Q# s: t
StrictModes yes3 A. u; ]+ k, W4 o
鈭賊瑼獢甈閮剖交航炊嚗航賡摰冽折◢芥憒雿輻刻 ~/.ssh/authorized_keys 甈亦 666嚗航賡嗡鈭箏臭誑典董
, r7 U- S& v+ ~- Y! v" L* B
& o! D" B2 f6 m8 U9 ^! L12.芾雿輻刻餃交憿舐內 banner (閰梯牧頝摰冽扳隞暻潮靽...? 憭扳臭誑函冗鈭斗孵頝憯鈭箏...= =a)6 n' {* ?3 \' z- |' q5 [
Banner /etc/ssh/banner # 隞餅摮瑼
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13. su/sudo
8 n  ^+ d0 e8 ]# vi /etc/pam.d/su8 w% e0 ?" m  F9 B% u6 I- H
    auth       required     /lib/security/$ISA/pam_wheel.so use_uid3 |6 Q7 P5 z  v9 T! d
# visudo1 Z9 D7 G# r& N4 M
    %wheel  ALL = (ALL) ALL- C. Z; n5 D3 H+ h9 W% k6 w& }
# gpasswd -a user1 wheel
4 S- c$ h. N  I2 ?/ c: c( C5 H
% {9 d: F- L2 B14. ssh 雿輻刻) Z4 u# S# A( J: P! _  Q, f3 a
# vi /etc/pam.d/sshd
- |( ]7 ]# Y# P    auth required pam_listfile.so item=user sense=allow file=/etc/ssh_users onerr=fail
5 ]; C9 {& ]2 q" y: A: \. F# echo <username> >> /etc/ssh_users7 T8 I0 f3 V0 D2 m. I, R
15.脫迫SSH蝺暹(timeout),霈PuTTY SSH 銝港蝺1 [  s. R* E% R/ ~2 n& e+ F
    靽格/etc/ssh/sshd_config
1 ^3 H, M% h( I) s, |/ N/ p2 i' S#TCPKeepAlive yes
+ l, ?0 l( [3 a#ClientAliveInterval 0. z$ K2 C5 D; P7 x, N- f
#ClientAliveCountMax 3

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     撠#踵==>摮瑼
7 [2 M7 s0 ~) z- o/ v3 G' q. X2 e#service ssd restart ==>sshd
) q: {7 h. X. w    乩靘靽格 Pietty 賂脣PuTTY 蝺閮剖:+ z  `2 [8 Z: n" y9 C' P) E
    豢Connection殷撠Seconds between keepalives [0 to turn off]喲甈雿頛詨交撟曄嚗喲銝null撠隞乩蝺
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4 J! J  |/ N& z2 i

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