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Fix bugs in OSPF MD5 authentication. First bug is that default

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values for MD5 password ID changed during reconfigure, Second
bug is that BIRD chooses password in first-fit manner, but RFC
says that it should use the one with the latest generate-from.

It also modifies the syntax for multiple passwords.
Now it is possible to just add more 'password' statements
to the interface section and it is not needed to use
'passwords' section. Old syntax can be used too.
This commit is contained in:
Ondrej Zajicek
2008-11-08 17:24:23 +01:00
parent 08cca48a14
commit b21f68b4cd
8 changed files with 56 additions and 59 deletions
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26
doc/bird.sgml
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@@ -1072,16 +1072,14 @@ protocol ospf <name> {
rx buffer [normal|large|<num>];
type [broadcast|nonbroadcast|pointopoint];
strict nonbroadcast <switch>;
authentication [none|simple];
authentication [none|simple|cryptographics];
password "<text>";
passwords {
password "<text>" {
id <num>;
generate from "<date>";
generate to "<date>";
accept from "<date>";
accept to "<date>";
};
password "<text>" {
id <num>;
generate from "<date>";
generate to "<date>";
accept from "<date>";
accept to "<date>";
};
neighbors {
<ip>;
@@ -1210,7 +1208,7 @@ protocol ospf <name> {
very weak.
<tag>authentication cryptographic</tag>
16-byte long md5 digest is appended to every packet. For the digest
16-byte long MD5 digest is appended to every packet. For the digest
generation 16-byte long passwords are used. Those passwords are
not sent via network, so this mechanismus is quite secure.
Packets can still be read by an attacker.
@@ -1220,7 +1218,9 @@ protocol ospf &lt;name&gt; {
<tag>id <M>num</M></tag>
ID of the password, (0-255). If it's not used, BIRD will choose
some automatically.
ID based on an order of the password item in the interface. For
example, second password item in one interface will have default
ID 2.
<tag>generate from <M>date</M></tag>
The start time of the usage of the password for packet signing.
@@ -1439,7 +1439,7 @@ RIP on networks where maximal distance is higher than 15 hosts. You can read mor
URL="http://www.ietf.org/html.charters/rip-charter.html" name="http://www.ietf.org/html.charters/rip-charter.html">. Both IPv4
(RFC 1723<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc1723.txt">)
and IPv6 (RFC 2080<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc2080.txt">) versions of RIP are supported by BIRD, historical RIPv1 (RFC 1058<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc1058.txt">)is
not currently supported. RIPv4 md5 authentication (RFC 2082<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc2082.txt">) is supported.
not currently supported. RIPv4 MD5 authentication (RFC 2082<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc2082.txt">) is supported.
<p>RIP is a very simple protocol, and it has a lot of shortcomings. Slow
convergence, big network load and inability to handle larger networks
@@ -1454,7 +1454,7 @@ because there are no good implementations of OSPFv3.
<descrip>
<tag/authentication none|plaintext|md5/ selects authentication method to be used. <cf/none/ means that
packets are not authenticated at all, <cf/plaintext/ means that a plaintext password is embedded
into each packet, and <cf/md5/ means that packets are authenticated using a md5 cryptographic
into each packet, and <cf/md5/ means that packets are authenticated using a MD5 cryptographic
hash. If you set authentication to not-none, it is a good idea to add <cf>passwords { }</cf>
section. Default: none.