1.安装ocserv
ocserv 已经在 epel 仓库中提供了,所以可以直接通过 yum 安装
$ yum install epel-release $ yum install ocserv
2. 创建 CA
cd /etc/ocserv
mkdir CA cd CA
vim ca.tmpl
cn = "liuyuanzhen" organization = "bd" serial = 1 expiration_days = 3650ca signing_key cert_signing_key crl_signing_key
CA 密钥
certtool --generate-privkey --outfile ca-key.pem
CA证书
certtool --generate-self-signed --load-privkey ca-key.pem --template ca.tmpl --outfile ca-cert.pem
vim server.tmpl
cn = "45.77.10.62" organization = "bd" expiration_days = 3650signing_key encryption_key tls_www_server
Server 密钥
certtool --generate-privkey --outfile server-key.pem
Server 证书
certtool --generate-certificate --load-privkey server-key.pem --load-ca-certificate ca-cert.pem --load-ca-privkey ca-key.pem --template server.tmpl --outfile server-cert.pem
证书路径(上述步骤创建):
/etc/ocserv/CA/ca-cert.pem /etc/ocserv/CA/server-cert.pem/etc/ocserv/CA/server-key.pem
vim /etc/ocserv/ocserv.conf
创建一个登陆用的用户名与密码
ocpasswd -c /etc/ocserv/ocpasswd liuyuanzhen
3.配置防火墙
network 192.169.5.0/24 (这个来自于)/etc/ocserv/ocserv.conf 中的 ipv4-network = 192.168.5.0/24
ocserv WAN interface is eth0
vim /etc/sysctl.conf
使之生效:
sysctl -p
关闭centos的原有防火墙
systemctl stop firewalld systemctl mask firewalld
安装新的iptables-services
yum install iptables-services service iptables start
vim /etc/sysconfig/iptables
配置
使之生效【重启机器后需要重新生效一下】
iptables-restore < /etc/sysconfig/iptables
ok
http://www.infradead.org/ocserv/recipes-ocserv-firewall-iptables-ipv4.html
https://hacpai.com/article/1484532040225
测试:
ocserv -f -d 1
运行
ocserv -c /etc/ocserv/ocserv.cnf
1.安装ocserv
ocserv 已经在 epel 仓库中提供了,所以可以直接通过 yum 安装
$ yum install epel-release $ yum install ocserv
2. 创建 CA
cd /etc/ocserv
mkdir CA cd CA
vim ca.tmpl
cn = "liuyuanzhen" organization = "bd" serial = 1 expiration_days = 3650ca signing_key cert_signing_key crl_signing_key
CA 密钥
certtool --generate-privkey --outfile ca-key.pem
CA证书
certtool --generate-self-signed --load-privkey ca-key.pem --template ca.tmpl --outfile ca-cert.pem
vim server.tmpl
cn = "45.77.10.62" organization = "bd" expiration_days = 3650signing_key encryption_key tls_www_server
Server 密钥
certtool --generate-privkey --outfile server-key.pem
Server 证书
certtool --generate-certificate --load-privkey server-key.pem --load-ca-certificate ca-cert.pem --load-ca-privkey ca-key.pem --template server.tmpl --outfile server-cert.pem
证书路径(上述步骤创建):
/etc/ocserv/CA/ca-cert.pem /etc/ocserv/CA/server-cert.pem/etc/ocserv/CA/server-key.pem
vim /etc/ocserv/ocserv.conf
# User authentication method. Could be set multiple times and in# that case all should succeed. To enable multiple methods use # multiple auth directives. Available options: certificate, # plain, pam, radius, gssapi. # # Note that authentication methods cannot be changed with reload. # certificate: # This indicates that all connecting users must present a certificate. # # pam[gid-min=1000]: # This enabled PAM authentication of the user. The gid-min option is used # by auto-select-group option, in order to select the minimum valid group ID. # # plain[passwd=/etc/ocserv/ocpasswd,otp=/etc/ocserv/users.otp] # The plain option requires specifying a password file which contains # entries of the following format. # "username:groupname1,groupname2:encoded-password"# One entry must be listed per line, and 'ocpasswd' should be used # to generate password entries. The 'otp' suboption allows to specify # an oath password file to be used for one time passwords; the format of # the file is described in https://code.google.com/p/mod-authn-otp/wiki/UsersFile# # radius[config=/etc/radiusclient/radiusclient.conf,groupconfig=true,nas-identifier=name,override-interim-updates=false]: # The radius option requires specifying freeradius-client configuration # file. If the groupconfig option is set, then config-per-user will be overriden, # and all configuration will be read from radius. The 'override-interim-updates' if set to # true will ignore Acct-Interim-Interval from the server and 'stats-report-time' will be considered. # # gssapi[keytab=/etc/key.tab,require-local-user-map=true,tgt-freshness-time=900] # The gssapi option allows to use authentication methods supported by GSSAPI, # such as Kerberos tickets with ocserv. It should be best used as an alternative # to PAM (i.e., have pam in auth and gssapi in enable-auth), to allow users with # tickets and without tickets to login. The default value for require-local-user-map # is true. The 'tgt-freshness-time' if set, it would require the TGT tickets presented # to have been issued within the provided number of seconds. That option is used to # restrict logins even if the KDC provides long time TGT tickets. auth = "plain[/etc/ocserv/ocpasswd]"#auth = "pam"#auth = "pam[gid-min=1000]"#auth = "plain[passwd=./sample.passwd,otp=./sample.otp]"#auth = "certificate"#auth = "radius[config=/etc/radiusclient/radiusclient.conf,groupconfig=true]"# Specify alternative authentication methods that are sufficient # for authentication. That is, if set, any of the methods enabled # will be sufficient to login. #enable-auth = "certificate"#enable-auth = "gssapi"#enable-auth = "gssapi[keytab=/etc/key.tab,require-local-user-map=true,tgt-freshness-time=900]"# Accounting methods available: # radius: can be combined with any authentication method, it provides # radius accounting to available users (see also stats-report-time). # # pam: can be combined with any authentication method, it provides # a validation of the connecting user's name using PAM. It is# superfluous to use this method when authentication is already # PAM. # # Only one accounting method can be specified. #acct = "radius[config=/etc/radiusclient/radiusclient.conf]"# Use listen-host to limit to specific IPs or to the IPs of a provided # hostname. #listen-host = [IP|HOSTNAME] # When the server has a dynamic DNS address (that may change), # should set that to true to ask the client to resolve again on # reconnects. #listen-host-is-dyndns = true# TCP and UDP port number tcp-port = 443udp-port = 443# Accept connections using a socket file. It accepts HTTP # connections (i.e., without SSL/TLS unlike its TCP counterpart), # and uses it as the primary channel. That option cannot be # combined with certificate authentication. #listen-clear-file = /var/run/ocserv-conn.socket # The user the worker processes will be run as. It should be # unique (no other services run as this user). run-as-user = ocserv run-as-group = ocserv # socket file used for IPC with occtl. You only need to set that, # if you use more than a single servers. #occtl-socket-file = /var/run/occtl.socket # socket file used for server IPC (worker-main), will be appended with .PID # It must be accessible within the chroot environment (if any), so it is best # specified relatively to the chroot directory. socket-file = ocserv.sock # The default server directory. Does not require any devices present.chroot-dir = /var/lib/ocserv ### All configuration options below this line are reloaded on a SIGHUP. ### The options above, will remain unchanged. Note however, that the ### server-cert, server-key, dh-params and ca-cert options will be reloaded ### if the provided file changes, on server reload. That allows certificate ### rotation, but requires the server key to remain the same for seamless ### operation. If the server key changes on reload, there may be connection ### failures during the reloading time. # Whether to enable seccomp/Linux namespaces worker isolation. That restricts the number of # system calls allowed to a worker process, in order to reduce damage from a # bug in the worker process. It is available on Linux systems at a performance cost. # The performance cost is roughly 2% overhead at transfer time (tested on a Linux 3.17.8). # Note however, that process isolation is restricted to the specific libc versions # the isolation was tested at. If you get random failures on worker processes, try # disabling that option and report the failures you, along with system and debugging # information at: https://gitlab.com/ocserv/ocserv/issuesisolate-workers = true# A banner to be displayed on clients #banner = "Welcome"# Limit the number of clients. Unset or set to zero for unlimited. #max-clients = 1024max-clients = 16# Limit the number of identical clients (i.e., users connecting # multiple times). Unset or set to zero for unlimited. max-same-clients = 2# Limit the number of client connections to one every X milliseconds # (X is the provided value). Set to zero for no limit. #rate-limit-ms = 100# Stats report time. The number of seconds after which each # worker process will report its usage statistics (number of # bytes transferred etc). This is useful when accounting like # radius is in use. #stats-report-time = 360# Keepalive in seconds keepalive = 32400# Dead peer detection in seconds. # Note that when the client is behind a NAT this value # needs to be short enough to prevent the NAT disassociating # his UDP session from the port number. Otherwise the client # could have his UDP connection stalled, for several minutes. dpd = 90# Dead peer detection for mobile clients. That needs to # be higher to prevent such clients being awaken too # often by the DPD messages, and save battery. # The mobile clients are distinguished from the header # 'X-AnyConnect-Identifier-DeviceType'. mobile-dpd = 1800# If using DTLS, and no UDP traffic is received for this # many seconds, attempt to send future traffic over the TCP # connection instead, in an attempt to wake up the client # in the case that there is a NAT and the UDP translation # was deleted. If this is unset, do not attempt to use this # recovery mechanism. switch-to-tcp-timeout = 25# MTU discovery (DPD must be enabled) try-mtu-discovery = true #false# The key and the certificates of the server # The key may be a file, or any URL supported by GnuTLS (e.g., # tpmkey:uuid=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx;storage=user # or pkcs11:object=my-vpn-key;object-type=private) # # The server-cert file may contain a single certificate, or # a sorted certificate chain. # # There may be multiple server-cert and server-key directives, # but each key should correspond to the preceding certificate. server-cert = /etc/ocserv/CA/server-cert.pem #/etc/pki/ocserv/public/server.crt server-key = /etc/ocserv/CA/server-key.pem #/etc/pki/ocserv/private/server.key # Diffie-Hellman parameters. Only needed if you require support # for the DHE ciphersuites (by default this server supports ECDHE). # Can be generated using: # certtool --generate-dh-params --outfile /path/to/dh.pem #dh-params = /path/to/dh.pem # If you have a certificate from a CA that provides an OCSP # service you may provide a fresh OCSP status response within # the TLS handshake. That will prevent the client from connecting # independently on the OCSP server. # You can update this response periodically using: # ocsptool --ask --load-cert=your_cert --load-issuer=your_ca --outfile response # Make sure that you replace the following file in an atomic way. #ocsp-response = /path/to/ocsp.der # In case PKCS #11, TPM or encrypted keys are used the PINs should be available # in files. The srk-pin-file is applicable to TPM keys only, and is the # storage root key. #pin-file = /path/to/pin.txt #srk-pin-file = /path/to/srkpin.txt # The password or PIN needed to unlock the key in server-key file. # Only needed if the file is encrypted or a PKCS #11 object. This # is an alternative method to pin-file. #key-pin = 1234# The SRK PIN for TPM. # This is an alternative method to srk-pin-file. #srk-pin = 1234# The Certificate Authority that will be used to verify # client certificates (public keys) if certificate authentication # is set. ca-cert = /etc/ocserv/CA/ca-cert.pem #/etc/pki/ocserv/cacerts/ca.crt # The object identifier that will be used to read the user ID in the client # certificate. The object identifier should be part of the certificate's DN# Useful OIDs are: # CN = 2.5.4.3, UID = 0.9.2342.19200300.100.1.1cert-user-oid = 2.5.4.3 #0.9.2342.19200300.100.1.1# The object identifier that will be used to read the user group in the # client certificate. The object identifier should be part of the certificate's# DN. Useful OIDs are: # OU (organizational unit) = 2.5.4.11#cert-group-oid = 2.5.4.11# The revocation list of the certificates issued by the 'ca-cert' above. # See the manual to generate an empty CRL initially. The CRL will be reloaded # periodically when ocserv detects a change in the file. To force a reload use # SIGHUP. #crl = /path/to/crl.pem # Uncomment this to enable compression negotiation (LZS, LZ4). #compression = true# Set the minimum size under which a packet will not be compressed. # That is to allow low-latency for VoIP packets. The default size # is 256 bytes. Modify it if the clients typically use compression # as well of VoIP with codecs that exceed the default value. #no-compress-limit = 256# GnuTLS priority string; note that SSL 3.0 is disabled by default # as there are no openconnect (and possibly anyconnect clients) using # that protocol. The string below does not enforce perfect forward # secrecy, in order to be compatible with legacy clients. # # Note that the most performant ciphersuites are the moment are the ones # involving AES-GCM. These are very fast in x86 and x86-64 hardware, and # in addition require no padding, thus taking full advantage of the MTU. # For that to be taken advantage of, the openconnect client must be # used, and the server must be compiled against GnuTLS 3.2.7 or later. # Use "gnutls-cli --benchmark-tls-ciphers", to see the performance # difference with AES_128_CBC_SHA1 (the default for anyconnect clients) # in your system. #tls-priorities = "NORMAL:%SERVER_PRECEDENCE:%COMPAT:-VERS-SSL3.0"tls-priorities = "NORMAL:%SERVER_PRECEDENCE:%COMPAT:-VERS-SSL3.0"# More combinations in priority strings are available, check # http://gnutls.org/manual/html_node/Priority-Strings.html# E.g., the string below enforces perfect forward secrecy (PFS) # on the main channel. #tls-priorities = "NORMAL:%SERVER_PRECEDENCE:%COMPAT:-RSA:-VERS-SSL3.0:-ARCFOUR-128"# That option requires the established DTLS channel to use the same # cipher as the primary TLS channel. This cannot be combined with # listen-clear-file since the ciphersuite information is not available # in that configuration. Note also, that this option implies that # dtls-legacy option is false; this option cannot be enforced # in the legacy/compat protocol. #match-tls-dtls-ciphers = true# The time (in seconds) that a client is allowed to stay connected prior # to authentication auth-timeout = 240# The time (in seconds) that a client is allowed to stay idle (no traffic) # before being disconnected. Unset to disable. #idle-timeout = 1200# The time (in seconds) that a client is allowed to stay connected # Unset to disable. #session-timeout = 86400# The time (in seconds) that a mobile client is allowed to stay idle (no # traffic) before being disconnected. Unset to disable. #mobile-idle-timeout = 2400# The time (in seconds) that a client is not allowed to reconnect after # a failed authentication attempt. min-reauth-time = 300# Banning clients in ocserv works with a point system. IP addresses # that get a score over that configured number are banned for# min-reauth-time seconds. By default a wrong password attempt is 10 points, # a KKDCP POST is 1 point, and a connection is 1 point. Note that # due to difference processes being involved the count of points # will not be real-time precise. # # Score banning cannot be reliably used when receiving proxied connections # locally from an HTTP server (i.e., when listen-clear-file is used). # # Set to zero to disable. max-ban-score = 50# The time (in seconds) that all score kept for a client is reset. ban-reset-time = 300# In case you'd like to change the default points.#ban-points-wrong-password = 10#ban-points-connection = 1#ban-points-kkdcp = 1# Cookie timeout (in seconds) # Once a client is authenticated he's provided a cookie with# which he can reconnect. That cookie will be invalided if not # used within this timeout value. On a user disconnection, that # cookie will also be active for this time amount prior to be # invalid. That should allow a reasonable amount of time for roaming # between different networks. cookie-timeout = 300# If this is enabled (not recommended) the cookies will stay # valid even after a user manually disconnects, and until they # expire. This may improve roaming with some broken clients. #persistent-cookies = true# Whether roaming is allowed, i.e., if true a cookie is # restricted to a single IP address and cannot be re-used # from a different IP. deny-roaming = false# ReKey time (in seconds) # ocserv will ask the client to refresh keys periodically once # this amount of seconds is elapsed. Set to zero to disable (note # that, some clients fail if rekey is disabled). rekey-time = 172800# ReKey method # Valid options: ssl, new-tunnel # ssl: Will perform an efficient rehandshake on the channel allowing # a seamless connection during rekey. # new-tunnel: Will instruct the client to discard and re-establish the channel. # Use this option only if the connecting clients have issues with the ssl # option. rekey-method = ssl # Script to call when a client connects and obtains an IP. # The following parameters are passed on the environment. # REASON, USERNAME, GROUPNAME, HOSTNAME (the hostname selected by client), # DEVICE, IP_REAL (the real IP of the client), IP_REAL_LOCAL (the local # interface IP the client connected), IP_LOCAL (the local IP # in the P-t-P connection), IP_REMOTE (the VPN IP of the client), # IPV6_LOCAL (the IPv6 local address if there are both IPv4 and IPv6 # assigned), IPV6_REMOTE (the IPv6 remote address), IPV6_PREFIX, and # ID (a unique numeric ID); REASON may be "connect" or "disconnect". # In addition the following variables OCSERV_ROUTES (the applied routes for this # client), OCSERV_NO_ROUTES, OCSERV_DNS (the DNS servers for this client), # will contain a space separated list of routes or DNS servers. A version # of these variables with the 4 or 6 suffix will contain only the IPv4 or # IPv6 values. # The disconnect script will receive the additional values: STATS_BYTES_IN, # STATS_BYTES_OUT, STATS_DURATION that contain a 64-bit counter of the bytes # output from the tun device, and the duration of the session in seconds. #connect-script = /usr/bin/ocserv-script #disconnect-script = /usr/bin/ocserv-script # UTMP # Register the connected clients to utmp. This will allow viewing # the connected clients using the command 'who'. #use-utmp = true# Whether to enable support for the occtl tool (i.e., either through D-BUS, # or via a unix socket). use-occtl = true# PID file. It can be overriden in the command line. pid-file = /var/run/ocserv.pid # Set the protocol-defined priority (SO_PRIORITY) for packets to # be sent. That is a number from 0 to 6 with 0 being the lowest # priority. Alternatively this can be used to set the IP Type-# Of-Service, by setting it to a hexadecimal number (e.g., 0x20). # This can be set per user/group or globally. #net-priority = 3# Set the VPN worker process into a specific cgroup. This is Linux # specific and can be set per user/group or globally. #cgroup = "cpuset,cpu:test"# # Network settings # # The name to use for the tun device device = vpns # Whether the generated IPs will be predictable, i.e., IP stays the # same for the same user when possible. predictable-ips = true# The default domain to be advertised default-domain = example.com # The pool of addresses that leases will be given from. If the leases # are given via Radius, or via the explicit-ip? per-user config option then# these network values should contain a network with at least a single # address that will remain under the full control of ocserv (that is # to be able to assign the local part of the tun device address). #ipv4-network = 192.168.1.0#ipv4-netmask = 255.255.255.0# An alternative way of specifying the network: ipv4-network = 192.168.5.0/24# The IPv6 subnet that leases will be given from. #ipv6-network = fda9:4efe:7e3b:03ea::/64# Specify the size of the network to provide to clients. It is # generally recommended to provide clients with a /64 network in# IPv6, but any subnet may be specified. To provide clients only # with a single IP use the prefix 128. #ipv6-subnet-prefix = 128#ipv6-subnet-prefix = 64# Whether to tunnel all DNS queries via the VPN. This is the default # when a default route is set. #tunnel-all-dns = true# The advertized DNS server. Use multiple lines for# multiple servers. # dns = fc00::4be0 #dns = 192.168.1.2dns = 8.8.8.8dns = 8.8.4.4# The NBNS server (if any) #nbns = 192.168.1.3# The domains over which the provided DNS should be used. Use # multiple lines for multiple domains. #split-dns = example.com # Prior to leasing any IP from the pool ping it to verify that # it is not in use by another (unrelated to this server) host. # Only set to true, if there can be occupied addresses in the # IP range for leases.ping-leases = false# Use this option to enforce an MTU value to the incoming # connections. Unset to use the default MTU of the TUN device. #mtu = 1420# Unset to enable bandwidth restrictions (in bytes/sec). The # setting here is global, but can also be set per user or per group. #rx-data-per-sec = 40000#tx-data-per-sec = 40000# The number of packets (of MTU size) that are available in# the output buffer. The default is low to improve latency. # Setting it higher will improve throughput. #output-buffer = 10# Routes to be forwarded to the client. If you need the # client to forward routes to the server, you may use the # config-per-user/group or even connect and disconnect scripts. # # To set the server as the default gateway for the client just # comment out all routes from the server, or use the special keyword # 'default'. #route = 10.10.10.0/255.255.255.0#route = 192.168.0.0/255.255.0.0#route = fef4:db8:1000:1001::/64# Subsets of the routes above that will not be routed by # the server. #no-route = 192.168.5.0/255.255.255.0# If set, the script /usr/bin/ocserv-fw will be called to restrict # the user to its allowed routes and prevent him from accessing # any other routes. In case of defaultroute, the no-routes are restricted. # All the routes applied by ocserv can be reverted using /usr/bin/ocserv-fw # --removeall. This option can be set globally or in the per-user configuration. #restrict-user-to-routes = true# When set to true, all client's iroutes are made visible to all# connecting clients except for the ones offering them. This option # only makes sense if config-per-user is set. #expose-iroutes = true# Groups that a client is allowed to select from. # A client may belong in multiple groups, and in certain use-cases # it is needed to switch between them. For these cases the client can # select prior to authentication. Add multiple entries for multiple groups. # The group may be followed by a user-friendly name in brackets. #select-group = group1 #select-group = group2[My special group] # The name of the (virtual) group that if selected it would assign the user # to its default group. #default-select-group = DEFAULT # Instead of specifying manually all the allowed groups, you may instruct # ocserv to scan all available groups and include the full list. #auto-select-group = true# Configuration files that will be applied per user connection or # per group. Each file name on these directories must match the username # or the groupname. # The options allowed in the configuration files are dns, nbns, # ipv?-network, ipv4-netmask, rx/tx-per-sec, iroute, route, no-route, # explicit-ipv4, explicit-ipv6, net-priority, deny-roaming, no-udp, # user-profile, cgroup, stats-report-time, and session-timeout. # # Note that the 'iroute' option allows to add routes on the server # based on a user or group. The syntax depends on the input accepted # by the commands route-add-cmd and route-del-cmd (see below). The no-udp # is a boolean option (e.g., no-udp = true), and will prevent a UDP session # for that specific user or group. #config-per-user = /etc/ocserv/config-per-user/#config-per-group = /etc/ocserv/config-per-group/# When config-per-xxx is specified and there is no group or user that # matches, then utilize the following configuration. #default-user-config = /etc/ocserv/defaults/user.conf #default-group-config = /etc/ocserv/defaults/group.conf # The system command to use to setup a route. %{R} will be replaced with the # route/mask and %{D} with the (tun) device. # # The following example is from linux systems. %R should be something # like 192.168.2.0/24 (the argument of iroute). #route-add-cmd = "ip route add %{R} dev %{D}"#route-del-cmd = "ip route delete %{R} dev %{D}"# This option allows to forward a proxy. The special keywords '%{U}'# and '%{G}', if present will be replaced by the username and group name. #proxy-url = http://example.com/#proxy-url = http://example.com/%{U}/# This option allows you to specify a URL location where a client can # post using MS-KKDCP, and the message will be forwarded to the provided # KDC server. That is a translation URL between HTTP and Kerberos. # In MIT kerberos you'll need to add in realms:# EXAMPLE.COM = { # kdc = https://ocserv.example.com/kerberos# http_anchors = FILE:/etc/ocserv-ca.pem # } # This option is available if ocserv is compiled with GSSAPI support. #kkdcp = SERVER-PATH KERBEROS-REALM PROTOCOL@SERVER:PORT #kkdcp = /kerberos EXAMPLE.COM udp@127.0.0.1:88#kkdcp = /kerberos-tcp EXAMPLE.COM tcp@127.0.0.1:88# # The following options are for (experimental) AnyConnect client # compatibility. # This option will enable the pre-draft-DTLS version of DTLS, and # will not require clients to present their certificate on every TLS # connection. It must be set to true to support legacy CISCO clients # and openconnect clients < 7.08. When set to true, it implies dtls-legacy = true. cisco-client-compat = true# This option allows to disable the DTLS-PSK negotiation (enabled by default). # The DTLS-PSK negotiation was introduced in ocserv 0.11.5 to deprecate # the pre-draft-DTLS negotiation inherited from AnyConnect. It allows the # DTLS channel to negotiate its ciphers and the DTLS protocol version. #dtls-psk = false# This option allows to disable the legacy DTLS negotiation (enabled by default, # but that may change in the future). # The legacy DTLS uses a pre-draft version of the DTLS protocol and was # from AnyConnect protocol. It has several limitations, that are addressed # by the dtls-psk protocol supported by openconnect 7.08+. dtls-legacy = true# Client profile xml. A sample file exists in doc/profile.xml. # It is required by some of the CISCO clients. # This file must be accessible from inside the worker's chroot.user-profile = profile.xml #Advanced options # Option to allow sending arbitrary custom headers to the client after # authentication and prior to VPN tunnel establishment. You shouldn't# need to use this option normally; if you do and you think that # this may help others, please send your settings and reason to # the openconnect mailing list. The special keywords '%{U}'# and '%{G}', if present will be replaced by the username and group name. #custom-header = "X-My-Header: hi there"
创建一个登陆用的用户名与密码
ocpasswd -c /etc/ocserv/ocpasswd liuyuanzhen
3.配置防火墙
network 192.169.5.0/24 (这个来自于)/etc/ocserv/ocserv.conf 中的 ipv4-network = 192.168.5.0/24
ocserv WAN interface is eth0
vim /etc/sysctl.conf
# sysctl settings are defined through files in# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/. # # Vendors settings live in /usr/lib/sysctl.d/. # To override a whole file, create a new file with the same in# /etc/sysctl.d/ and put new settings there. To override # only specific settings, add a file with a lexically later # name in /etc/sysctl.d/ and put new settings there. # # For more information, see sysctl.conf(5) and sysctl.d(5). # Accept IPv6 advertisements when forwarding is enabled # Protect from IP Spoofing net.ipv4.conf.all.rp_filter = 1net.ipv4.conf.default.rp_filter = 1# Ignore ICMP broadcast requests net.ipv4.icmp_echo_ignore_broadcasts = 1# Protect from bad icmp error messages net.ipv4.icmp_ignore_bogus_error_responses = 1# Disable source packet routing net.ipv4.conf.all.accept_source_route = 0net.ipv6.conf.all.accept_source_route = 0net.ipv4.conf.default.accept_source_route = 0net.ipv6.conf.default.accept_source_route = 0# Turn on exec shield kernel.exec-shield = 1kernel.randomize_va_space = 1# Block SYN attacks net.ipv4.tcp_syncookies = 1net.ipv4.tcp_max_syn_backlog = 2048net.ipv4.tcp_synack_retries = 2net.ipv4.tcp_syn_retries = 5# Log Martians net.ipv4.conf.all.log_martians = 1net.ipv4.icmp_ignore_bogus_error_responses = 1# Ignore send redirects net.ipv4.conf.all.send_redirects = 0net.ipv4.conf.default.send_redirects = 0# Ignore ICMP redirects net.ipv4.conf.all.accept_redirects = 0net.ipv6.conf.all.accept_redirects = 0net.ipv4.conf.default.accept_redirects = 0net.ipv6.conf.default.accept_redirects = 0net.ipv4.conf.all.secure_redirects = 0net.ipv4.conf.default.secure_redirects = 0net.ipv6.conf.all.accept_ra = 2net.ipv6.conf.eth0.accept_ra = 2net.ipv4.ip_forward = 1
使之生效:
sysctl -p
关闭centos的原有防火墙
systemctl stop firewalld systemctl mask firewalld
安装新的iptables-services
yum install iptables-services service iptables start
vim /etc/sysconfig/iptables
配置
# sample configuration for iptables service # you can edit this manually or use system-config-firewall # please do not ask us to add additional ports/services to this default configuration #*filter #:INPUT ACCEPT [0:0] #:FORWARD ACCEPT [0:0] #:OUTPUT ACCEPT [0:0] #-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT #-A INPUT -p icmp -j ACCEPT #-A INPUT -i lo -j ACCEPT #-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT #-A INPUT -j REJECT --reject-with icmp-host-prohibited #-A FORWARD -j REJECT --reject-with icmp-host-prohibited #COMMIT #*nat :INPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] # Generic NAT for LAN Network 192.168.5.0/24-A POSTROUTING -s 192.168.5.0/24 -o eth0 -j MASQUERADE COMMIT*mangle :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT*filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] # START INPUT RULES # Stateful Rule - INPUT-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # ACCEPT traffic from Loopback interface-A INPUT -i lo -j ACCEPT # ACCEPT SSH from LAN-A INPUT -p tcp -m tcp -i eth0 --dport 22 -j ACCEPT # ACCEPT DHCP from LAN-A INPUT -p udp -m udp -i eth1 --dport 67:68 -j ACCEPT # ACCEPT Webmin from LAN (Optional, only for Webmin users)-A INPUT -p tcp -m tcp -i eth1 --dport 10000 -j ACCEPT # ACCEPT DNS UDP From LAN-A INPUT -p udp -m udp -i eth1 --dport 53 -j ACCEPT # ACCEPT DNS TCP From LAN-A INPUT -p tcp -m tcp -i eth1 --dport 53 -j ACCEPT # ACCEPT ping from LAN-A INPUT -p icmp --icmp-type echo-request -i eth1 -j ACCEPT # ACCEPT OpenConnect TCP From WAN-A INPUT -p tcp -m tcp -i eth0 --dport 443 -j ACCEPT # ACCEPT OpenConnect UPD From WAN-A INPUT -p udp -m udp -i eth0 --dport 443 -j ACCEPT # DROP wan traffic-A INPUT -i eth0 -j DROP # LOG LAN-A INPUT -i eth1 -j LOG --log-prefix "IPTABLES-LOG-INPUT-LAN:" --log-level 4# ACCEPT LAN traffic - Learning rule - Should be changed to DROP once custom rules are created.-A INPUT -i eth1 -j ACCEPT # LAST RULE - DROP all traffic-A INPUT -j DROP # END INPUT RULES # START FORWARD RULES # Stateful Rule - FORWARD-A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT # ACCEPT LAN to WAN-A FORWARD -s 192.168.5.0/24 -j ACCEPT # LOG Forwarded traffic-A FORWARD -j LOG --log-prefix "IPTABLES-LOG-FORWARD:" --log-level 4# LAST RULE - ACCEPT all traffic - Should be changed to DROP once custom rules are created.-A FORWARD -j ACCEPT # END FORWARD RULES # START OUTPUT RULES # Stateful Rule - OUTPUT-A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # LOG Outgoing traffic-A OUTPUT -j LOG --log-prefix "IPTABLES-LOG-OUTPUT:" --log-level 4# LAST RULE - ACCEPT all traffic - Should be changed to DROP once custom rules are created.-A OUTPUT -j ACCEPT # END OUTPUT RULES COMMIT
使之生效【重启机器后需要重新生效一下】
iptables-restore < /etc/sysconfig/iptables
ok
http://www.infradead.org/ocserv/recipes-ocserv-firewall-iptables-ipv4.html
https://hacpai.com/article/1484532040225
测试:
ocserv -f -d 1
运行
ocserv -c /etc/ocserv/ocserv.cnf
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