diff options
Diffstat (limited to 'sbin/ipsecadm')
| -rw-r--r-- | sbin/ipsecadm/ipsecadm.8 | 161 |
1 files changed, 97 insertions, 64 deletions
diff --git a/sbin/ipsecadm/ipsecadm.8 b/sbin/ipsecadm/ipsecadm.8 index 34437cfa36f..e9eed806137 100644 --- a/sbin/ipsecadm/ipsecadm.8 +++ b/sbin/ipsecadm/ipsecadm.8 @@ -1,4 +1,5 @@ -.\" $OpenBSD: ipsecadm.8,v 1.20 2000/01/13 04:48:55 angelos Exp $ +.\" $OpenBSD: ipsecadm.8,v 1.21 2000/03/18 22:55:59 aaron Exp $ +.\" .\" Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de> .\" All rights reserved. .\" @@ -85,8 +86,9 @@ modifiers are: and .Fl key . .It old esp -Setup a SA which uses the old esp transforms. Only -encryption algorithms can be applied. Allowed modifiers are: +Setup a SA which uses the old esp transforms. +Only encryption algorithms can be applied. +Allowed modifiers are: .Fl dst , .Fl src , .Fl proxy , @@ -97,9 +99,9 @@ encryption algorithms can be applied. Allowed modifiers are: and .Fl key . .It new ah -Setup a SA which uses the new ah transforms. Authentication -will be done with HMAC using the specified hash algorithm. Allowed modifiers -are: +Setup a SA which uses the new ah transforms. +Authentication will be done with HMAC using the specified hash algorithm. +Allowed modifiers are: .Fl dst , .Fl src , .Fl proxy , @@ -109,8 +111,9 @@ are: and .Fl key . .It old ah -Setup a SA which uses the old ah transforms. Simple keyed -hashes will be used for authentication. Allowed modifiers are: +Setup a SA which uses the old ah transforms. +Simple keyed hashes will be used for authentication. +Allowed modifiers are: .Fl dst , .Fl src , .Fl proxy , @@ -120,12 +123,16 @@ hashes will be used for authentication. Allowed modifiers are: and .Fl key . .It ip4 -Setup an SA which uses the IP-in-IP encapsulation protocol. This mode +Setup an SA which uses the IP-in-IP encapsulation protocol. +This mode offers no security services by itself, but can be used to route other -(experimental or otherwise) protocols over an IP network. The SPI value +(experimental or otherwise) protocols over an IP network. +The SPI value is not used for anything other than referencing the information, and -does not appear on the wire. Unlike other setups, like new esp, there -is no necessary setup in the receiving side. Allowed modifiers are: +does not appear on the wire. +Unlike other setups, like new esp, there +is no necessary setup in the receiving side. +Allowed modifiers are: .Fl dst , .Fl src , and @@ -135,11 +142,12 @@ The specified SA will be deleted. Allowed modifiers are: .Fl dst , .Fl spi , -.Fl proto . +.Fl proto , and .Fl chain . .It group -Group two SAs together. Allowed modifiers are: +Group two SAs together. +Allowed modifiers are: .Fl dst , .Fl spi , .Fl proto , @@ -165,7 +173,8 @@ and .Fl bypass . The .Xr netstat 1 -command shows the existing egress (outbound) flows. A +command shows the existing egress (outbound) flows. +A .Nm bypass flow is used to specify a flow for which IPSec processing will be bypassed, i.e packets will not be processed by any SAs. @@ -199,8 +208,10 @@ and This can be useful while travelling where the IP address of potential clients is not known. .It flush -Flush SAs from from kernel. This includes flushing any flows and -routing entries associated with the SAs. Allowed modifiers are: +Flush SAs from from kernel. +This includes flushing any flows and +routing entries associated with the SAs. +Allowed modifiers are: .Fl ah , .Fl esp , .Fl oldah , @@ -218,114 +229,134 @@ defaults to new esp mode. The modifiers have the following meanings: .Bl -tag -width forcetunnel -offset indent .It src -The source IP address for the SA. This is necessary for incoming +The source IP address for the SA. +This is necessary for incoming SAs to avoid source address spoofing between mutually -suspicious hosts that have established SAs with us. For outgoing SAs, -this field is used to fill in the source address when doing -tunneling. +suspicious hosts that have established SAs with us. +For outgoing SAs, +this field is used to fill in the source address when doing tunneling. .It dst The destination IP address for the SA. .It proxy This IP address, if provided, is checked against the inner IP address when -doing tunneling to a firewall, to prevent source spoofing attacks. It is -strongly recommended that this option is provided when applicable. It is +doing tunneling to a firewall, to prevent source spoofing attacks. +It is +strongly recommended that this option is provided when applicable. +It is applicable in a scenario when host A is using IPsec to communicate with -firewall B, and through that to host C. In that case, the proxy address for -the incoming SA should be C. This option is not necessary for outgoing SAs. +firewall B, and through that to host C. +In that case, the proxy address for +the incoming SA should be C. +This option is not necessary for outgoing SAs. .It spi The Security Parameter Index (SPI). .It tunnel -This option has been deprecated. The arguments are ignored, and it -otherwise has the same effect as the +This option has been deprecated. +The arguments are ignored, and it otherwise has the same effect as the .Nm forcetunnel option. .It newpadding This option has been deprecated. .It forcetunnel Force IP-inside-IP encapsulation before ESP or AH processing is performed for -outgoing packets. The source/destination addresses of the outgoing IP packet +outgoing packets. +The source/destination addresses of the outgoing IP packet will be those provided in the .Nm src and .Nm dst -options. Notice that the IPsec stack will perform IP-inside-IP encapsulation +options. +Notice that the IPsec stack will perform IP-inside-IP encapsulation when deemed necessary, even if this flag has not been set. .It enc -The encryption algorithm to be used with the SA. Possible values -are: +The encryption algorithm to be used with the SA. +Possible values are: .Bl -tag -width skipjack .It Nm des This is available for both old and new esp. Notice that hardware crackers for DES can be (and have been) built for -US$250,000 (in 1998). Use DES for encryption of critical information -at your own risk. -We suggest using 3DES instead. DES support is kept for interoperability -(with old implementations) purposes only. See +US$250,000 (in 1998). +Use DES for encryption of critical information at your own risk. +We suggest using 3DES instead. +DES support is kept for interoperability +(with old implementations) purposes only. +See .Xr des_cipher 3 . .It Nm 3des -This is available for both old and new esp. It is considered -more secure than straight DES, since it uses larger keys. +This is available for both old and new esp. +It is considered more secure than straight DES, since it uses larger keys. .It Nm blf -Blowfish encryption is available only in new esp. See +Blowfish encryption is available only in new esp. +See .Xr blf_key 3 . .It Nm cast CAST encryption is available only in new esp. .It Nm skipjack -SKIPJACK encryption is available only in new esp. This algorithm designed -by the NSA is faster than 3DES. However, since it was designed by the NSA +SKIPJACK encryption is available only in new esp. +This algorithm designed by the NSA and is faster than 3DES. +However, since it was designed by the NSA it is a poor choice. .El .Pp .It auth -The authentication algorithm to be used with the SA. Possible values -are: +The authentication algorithm to be used with the SA. +Possible values are: .Nm md5 and .Nm sha1 -for both old and new ah and also new esp. Also +for both old and new ah and also new esp. +Also .Nm rmd160 for both new ah and esp. .It key -The secret symmetric key used for encryption and authentication. The size -for +The secret symmetric key used for encryption and authentication. +The size for .Nm des and .Nm 3des -is fixed to 8 and 24 respectively. For other ciphers like +is fixed to 8 and 24 respectively. +For other ciphers like .Nm cast or .Nm blf -the key length can be variable. The +the key length can be variable. +The .Nm key -should be given in hexadecimal digits. The +should be given in hexadecimal digits. +The .Nm key should be chosen in random (ideally, using some true-random source like -coin flipping). It is very important that the key is not guessable. One -practical way of generating keys is by using the +coin flipping). +It is very important that the key is not guessable. +One practical way of generating keys is by using the .Xr random 4 device (e.g., dd if=/dev/urandom bs=1024 count=1 | sha1) .It authkey The secret key material used for authentication -if additional authentication in new esp mode is required. For -old or new ah the key material for authentication is passed with the +if additional authentication in new esp mode is required. +For old or new ah the key material for authentication is passed with the .Nm key -option. The +option. +The .Nm key -should be given in hexadecimal digits. The +should be given in hexadecimal digits. +The .Nm key should be chosen in random (ideally, using some true-random source like -coin flipping). It is very important that the key is not guessable. One -practical way of generating keys is by using the +coin flipping). +It is very important that the key is not guessable. +One practical way of generating keys is by using the .Xr random 4 device (e.g., dd if=/dev/urandom bs=1024 count=1 | sha1) .It iv -This option has been deprecated. The argument is ignored. When applicable, -it has the same behaviour as the +This option has been deprecated. +The argument is ignored. +When applicable, it has the same behaviour as the .Nm halfiv option. .It halfiv -This option causes use of a 4 byte IV in old ESP (as opposed to 8 bytes). It -may only be used with old ESP. +This option causes use of a 4 byte IV in old ESP (as opposed to 8 bytes). +It may only be used with old ESP. .It proto The security protocol needed by .Nm delspi , @@ -364,12 +395,14 @@ case insensitive. .It addr The source address, source network mask, destination address and destination network mask against which packets need to match to use the specified -Security Association. All addresses must be of the same address family +Security Association. +All addresses must be of the same address family (IPv4 or IPv6). .It transport The protocol number which packets need to match to use the specified -Security Association. By default the protocol number is not used for -matching. Instead of a number, a valid protocol name that appears in +Security Association. +By default the protocol number is not used for matching. +Instead of a number, a valid protocol name that appears in .Xr protocols 5 can be used. .It sport @@ -432,7 +465,7 @@ For .Nm flush , only flush SAs of type ip4. .El -.Sh EXAMPLE +.Sh EXAMPLES Setup a SA which uses new esp with 3des encryption and HMAC-SHA1 authentication: .Bd -literal |