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kamailio/modules/auth/README

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The Auth Module
Jan Janak
FhG Fokus
<jan@iptel.org>
Juha Heinanen
TutPro Inc
<jh@song.fi>
Daniel-Constantin Mierla
asipto.com
<miconda@gmail.com>
Copyright © 2002, 2003 FhG FOKUS
_________________________________________________________________
Table of Contents
1. Admin Guide
1. Overview
2. Dependencies
3. Parameters
3.1. auth_checks_register, auth_checks_no_dlg, and
auth_checks_in_dlg (flags)
3.2. qop (string)
3.3. nonce_count (boolean)
3.4. one_time_nonce (boolean)
3.5. nid_pool_no (integer)
3.6. nc_array_size (integer)
3.7. nc_array_order (integer)
3.8. otn_in_flight_no (integer)
3.9. otn_in_flight_order (integer)
3.10. secret (string)
3.11. nonce_expire (integer)
3.12. nonce_auth_max_drift (integer)
3.13. force_stateless_reply (boolean)
3.14. realm_prefix (string)
3.15. use_domain (boolean)
4. Functions
4.1. consume_credentials()
4.2. has_credentials(realm)
4.3. www_challenge(realm, flags)
4.4. proxy_challenge(realm, flags)
4.5. auth_challenge(realm, flags)
4.6. pv_www_authenticate(realm, passwd, flags [, method])
4.7. pv_proxy_authenticate(realm, passwd, flags)
4.8. pv_auth_check(realm, passwd, flags, checks)
4.9. auth_get_www_authenticate(realm, flags, pvdest)
List of Examples
1.1. Setting the auth_checks_register module parameter
1.2. qop example
1.3. nonce_count example
1.4. one_time_nonce example
1.5. nid_pool_no example
1.6. nc_array_size example
1.7. nc_array_order example
1.8. otn_in_flight_no example
1.9. otn_in_flight_order example
1.10. Setting secret module parameter
1.11. nonce_expire example
1.12. nonce_auth_max_drift example
1.13. force_stateless_reply example
1.14. realm_prefix parameter example
1.15. force_stateless_reply example
1.16. consume_credentials example
1.17. consume_credentials example
1.18. www_challenge usage
1.19. proxy_challenge usage
1.20. auth_challenge usage
1.21. pv_www_authenticate usage
1.22. pv_proxy_authenticate usage
1.23. pv_auth_check usage
1.24. auth_get_www_authenticate
Chapter 1. Admin Guide
Table of Contents
1. Overview
2. Dependencies
3. Parameters
3.1. auth_checks_register, auth_checks_no_dlg, and
auth_checks_in_dlg (flags)
3.2. qop (string)
3.3. nonce_count (boolean)
3.4. one_time_nonce (boolean)
3.5. nid_pool_no (integer)
3.6. nc_array_size (integer)
3.7. nc_array_order (integer)
3.8. otn_in_flight_no (integer)
3.9. otn_in_flight_order (integer)
3.10. secret (string)
3.11. nonce_expire (integer)
3.12. nonce_auth_max_drift (integer)
3.13. force_stateless_reply (boolean)
3.14. realm_prefix (string)
3.15. use_domain (boolean)
4. Functions
4.1. consume_credentials()
4.2. has_credentials(realm)
4.3. www_challenge(realm, flags)
4.4. proxy_challenge(realm, flags)
4.5. auth_challenge(realm, flags)
4.6. pv_www_authenticate(realm, passwd, flags [, method])
4.7. pv_proxy_authenticate(realm, passwd, flags)
4.8. pv_auth_check(realm, passwd, flags, checks)
4.9. auth_get_www_authenticate(realm, flags, pvdest)
1. Overview
This is a generic module that itself doesn't provide all functions
necessary for authentication but provides functions that are needed by
all other authentication related modules (so called authentication
backends).
We decided to divide the authentication code into several modules
because there are now more than one backends (currently database
authentication and radius are supported). This allows us to create
separate packages so users can install and load only the required
functionality. This also allows us to avoid unnecessary dependencies
in the binary packages.
2. Dependencies
The module does not depend on any other module.
3. Parameters
3.1. auth_checks_register, auth_checks_no_dlg, and auth_checks_in_dlg
(flags)
3.2. qop (string)
3.3. nonce_count (boolean)
3.4. one_time_nonce (boolean)
3.5. nid_pool_no (integer)
3.6. nc_array_size (integer)
3.7. nc_array_order (integer)
3.8. otn_in_flight_no (integer)
3.9. otn_in_flight_order (integer)
3.10. secret (string)
3.11. nonce_expire (integer)
3.12. nonce_auth_max_drift (integer)
3.13. force_stateless_reply (boolean)
3.14. realm_prefix (string)
3.15. use_domain (boolean)
3.1. auth_checks_register, auth_checks_no_dlg, and auth_checks_in_dlg
(flags)
These three module parameters control which optional integrity checks
will be performed on the SIP message carrying digest response during
digest authentication. auth_check_register controls integrity checks
to be performed on REGISTER messages, auth_checks_no_dlg controls
which optional integrity checks will be performed on SIP requests that
have no To header field or no To tag (in other words the requests
either establishing or outside dialogs). auth_checks_in_dlg controls
which integrity checks will be performed on SIP requests within
dialogs, such as BYE or re-INVITE. The default value for all three
parameters is 0 (old behaviour, no extra checks). The set of integrity
checks that can be performed on REGISTERs is typically different from
sets of integrity checks that can be performed for other SIP request
types, hence we have three independent module parameters.
Without the extra checks the nonce will protect only against expired
values. Some reply attacks are still possible in the expire "window".
A possible workaround is to always force qop authentication and always
check the uri from the authorization header, but this would not work
if an upstream proxy rewrites the uri and it will also not work with a
lot of UA implementations.
In this case the nonce value will be used only to hold the expire time
(see nonce_expire) and an MD5 over it and some secret (the MD5 is used
to make sure that nobody tampers with the nonce expire time).
When the extra checks are enabled, the nonce will include and extra
MD5 over the selected part/parts of the message (see below) and some
other secret. This will be used to check if the selected part of the
message is the same when an UA tries to reuse the nonce, thus
protecting or severely limiting reply attacks.
The possible flag values for all three parameters are:
* 1 for checking if the message uri changed (uses the whole uri)
* 2 for checking the callid
* 4 for checking the from tag
* 8 for checking the source ip (see nonce.h).
For example setting auth_checks_register to 3 would check if the
callid or the request uri changed from the REGISTER message for which
the original nonce was generated (this would allow nonce reuse only
within the same UA and for the expire time). Note that enabling the
extra checks will limit nonce caching by UAs, requiring extra
challenges and roundtrips, but will provide much better protection.
Warning
Do not enable the from tag check (4) for REGISTERs
(auth_checks_register) and out-of-dialog messages (auth_checks_no_dlg)
unless you are sure that all your user agents do not change the from
tag when challenged. Some user agents will also change the callid when
the challenged request is not in-dialog, so avoid enabling the callid
check (2) for messages that are not part of a dialog
(auth_checks_no_dlg). In some rare case this will also have to be done
for REGISTERs.
When the secret parameter is set and the extra checks are enabled, the
first half of the secret will be used for the expire time MD5 and the
other half for the extra checks MD5, so make sure you have a long
secret (32 chars or longer are recommended).
Example 1.1. Setting the auth_checks_register module parameter
...
# For REGISTER requests we hash the Request-URI, Call-ID, and source IP of the
# request into the nonce string. This ensures that the generated credentials
# cannot be used with another registrar, user agent with another source IP
# address or Call-ID. Note that user agents that change Call-ID with every
# REGISTER message will not be able to register if you enable this.
modparam("auth", "auth_checks_register", 11)
# For dialog-establishing requests (such as the original INVITE, OPTIONS, etc)
# we hash the Request-URI and source IP. Hashing Call-ID and From tags takes
# some extra precaution, because these checks could render some UA unusable.
modparam("auth", "auth_checks_no_dlg", 9)
# For mid-dialog requests, such as re-INVITE, we can hash source IP and
# Request-URI just like in the previous case. In addition to that we can hash
# Call-ID and From tag because these are fixed within a dialog and are
# guaranteed not to change. This settings effectively restrict the usage of
# generated credentials to a single user agent within a single dialog.
modparam("auth", "auth_checks_in_dlg", 15)
...
3.2. qop (string)
If set, enable qop for challenges: each challenge will include a qop
parameter. This is the recommended way, but some older non rfc3261
compliant UAs might get confused and might not authenticate properly
if qop is enabled.
Enabling qop together with nonce_count will provide extra-security
(protection against replay attacks) while still allowing credentials
caching at the UA side and thus not compromising performance.
The possible values are: "auth", "auth-int" and "" (unset).
The default value is not-set ("").
See also: nonce_count.
Example 1.2. qop example
...
modparam("auth", "qop", "auth") # set qop=auth
...
3.3. nonce_count (boolean)
If enabled the received nc value is remembered and checked against the
older value (for a successful authentication the received nc must be
greater then the previously received one, see rfc2617 for more
details). This will provide protection against replay attacks while
still allowing credentials caching at the UA side.
It depends on qop being enabled (if qop is not enabled, the challenges
won't include qop and so the UA will probably not include the qop or
nc parameters in its response).
If a response doesn't include qop or nc (for example obsolete UAs that
don't support them) the response will be checked according to the
other enabled nonce checks, in this order: one_time_nonce and
auth_check_*. If a response includes nc only the normal nonce_expire
checks and the nonce_count checks will be performed, all the other
checks will be ignored.
The nonce_count checks work by tracking a limited number of nonces.
The maximum number of tracked nonces is set using the nc_array_size or
nc_array_order parameters. If this number is exceeded, older entries
will be overwritten. As long as the maximum rate of challengeable
messages per average response time is lower then nc_array_size, the
nonce_count checks should work flawlessly. For optimum performance
(maximum reuse of cache credentials) nc_array_size divided by
nid_pool_no should be lower then the message rate multiplied by the
desired nonce_expire.
The maximum accepted nc value is 255. If nc becomes greater then this,
the nonce will be considered stale and the UA will be re-challenged.
Note: nonce_count should be enabled only in stateful mode (a
transaction should be created prior to the authentication check to
absorb possible retransmissions and all the replies should be sent
statefuly, using t_reply()). If nonce_count and the authentication
checks are used in the stateless mode then all retransmissions will be
challenged.
The default value is 0 (off).
See also: qop, nc_array_size, nc_array_order, nid_pool_no,
nonce_expire. one_time_nonce.
Example 1.3. nonce_count example
...
modparam("auth", "nonce_count", 1) # enable nonce_count support
modparam("auth", "qop", "auth") # enable qop=auth
....
route{
...
# go stateful and catch retransmissions
if (!t_newtran()) {
xlog("L_NOTICE", "Failed to create new transaction\n");
drop;
};
if (method=="REGISTER"){
if (!www_authenticate("test", "credentials")){
# reply must be sent with t_reply because the
# transaction is already created at this point
# (we are in "stateful" mode)
if ($? == -2){
t_reply("500", "Internal Server Error");
}else if ($? == -3){
t_reply("400", "Bad Request");
}else{
if ($digest_challenge)
append_to_reply("%$digest_challenge");
t_reply("401", "Unauthorized");
}
drop;
}
if (!save_noreply("location")) {
t_reply("400", "Invalid REGISTER Request");
drop;
}
append_to_reply("%$contact");
t_reply("$code", "$reason"); # no %, avps are used directly
drop;
}else{
if (!proxy_authenticate("my_realm", "credentials")){
if ($? == -2){
t_reply("500", "Internal Server Error");
}else if ($? == -3){
t_reply("400", "Bad Request");
}else{
if ($digest_challenge)
append_to_reply("%$digest_challenge");
t_reply("401", "Unauthorized");
}
drop;
}
}
...
3.4. one_time_nonce (boolean)
If set to 1 nonce reuse is disabled: each nonce is allowed only once,
in the first reponse to a challenge. All the messages will be
challenged, even retransmissions. Stateful mode should be used, to
catch retransmissions before the authentication checks (using
t_newtran() before the authentication checks and sending all the
replies with t_reply()).
one_time_nonce provides enhanced replay protections at the cost of
invalidating UA side credentials caching, challenging every message
(and thus generating extra messages and extra round-trips) and
requiring stateful mode. In general qop and nonce_count should be
prefered (if possible) with fallback to auth_checks_*. Due to the
disadvantages listed above, one_time_nonce should be used only if the
extra checks provided by auth_checks_register, auth_checks_no_dlg and
auth_checks_in_dlg are deemed insufficient for a specific setup.
Compared to nonce_count, one_time_nonce provides the same protection,
but at a higher message cost. The only advantages are that it works
with user agents that do not support qop and nc and that it uses less
memory for the same supported number of maximum in-flight nonces (by a
factor of 8). one_time_nonce can be used as fallback from nonce_count,
when the UA doesn't support nc (it happens automatically when both of
them are enabled).
Like nonce_count, one_time_nonce works by tracking a limited number of
nonces. The maximum number of tracked nonces is set using the
otn_in_flight_no or otn_in_flight_order parameters. If this number is
exceeded, older entries will be overwritten. As long as the maximum
rate of challengeable messages per average response time is lower then
otn_in_flight_no, the one_time_nonce checks should work flawlessly.
The default value is 0 (off).
See also: otn_in_flight_no, otn_in_flight_order, nid_pool_no and
nonce_count.
Example 1.4. one_time_nonce example
...
modparam("auth", "one_time_nonce", 1)
# Note: stateful mode should be used, see the nonce_count example
...
3.5. nid_pool_no (integer)
Controls the number of partitions for the nonce_count and
one_time_nonce arrays (it's common to both of them to reduce the nonce
size).
Instead of using single arrays for keeping nonce state, these arrays
can be divided into more partitions. Each ser process is assigned to
one of these partitions, allowing for higher concurrency on multi-CPU
machines. Besides increasing performance, increasing nid_pool_no has
also a negative effect: it could decrease the maximum supported
in-flight nonces in certain conditions. In the worst case, when only
one ser process receives most of the traffic (e.g. very busy tcp
connection between two proxies), the in-flight nonces could be limited
to the array size (nc_array_size for nonce_count or otn_in_flight_no
for one_time_nonce) divided by the partitions number (nid_pool_no).
However for normal traffic, when the process receiving a message is
either random or chosen in a round-robin fashion the maximum in-flight
nonces number will be very little influenced by nid_pool_no (the
messages will be close to equally distributed to processes using
different partitions).
nid_pool_no value should be one of: 1, 2, 4, 8, 16, 32 or 64 (the
maximum value is 64 and all values should be of the form 2^k or else
they will be rounded down to 2^k).
The default value is 1.
See also: nonce_count, one_time_nonce, nc_array_size and
otn_in_flight_no.
Example 1.5. nid_pool_no example
...
modparam("auth", "nid_pool_no", 4)
...
3.6. nc_array_size (integer)
Maximum number of in-flight nonces for nonce_count. It represents the
maximum nonces for which state will be kept. When this number is
exceeded, state for the older nonces will be discarded to make space
for new ones (see nonce_count for more details).
The value should be of the form 2^k. If it's not it will be rounded
down to 2^k (for example a value of 1000000 will be rounded down to
2^19=524288). nc_array_order can be used to directly specify the power
of 2 (e.g. nc_array_order set to 20 is equivalent to nc_array_size set
to 1048576).
The memory used to keep the nonce state will be nc_array_size in
bytes.
The default value is 1048576 (1M in-flight nonces, using 1Mb memory).
See also: nonce_count and nid_pool_no.
Example 1.6. nc_array_size example
...
modparam("auth", "nc_array_size", 4194304) # 4Mb
...
3.7. nc_array_order (integer)
Equivalent to nc_array_size, but instead of directly specifying the
size, its value is the power at which 2 should be raised
(log2(nc_array_size)).
nc_array_size = 2^nc_array_order. For more details see nc_array_size.
The default value is 20 (1M in-flight nonces, using 1Mb memory).
See also: nonce_count, nc_array_size and nid_pool_no.
Example 1.7. nc_array_order example
...
modparam("auth", "nc_array_order", 22) # 4Mb
...
3.8. otn_in_flight_no (integer)
Maximum number of in-flight nonces for one_time_nonce. It represents
the maximum number of nonces remembered for the one-time-nonce check.
When this number is exceeded, information about older nonces will be
discarded and overwritten with information about the new generated
ones (see one_time_nonce for more details).
The value should be of the form 2^k. If it's not it will be rounded
down to 2^k (for example a value of 1000000 will be rounded down to
2^19=524288). otn_in_flight_no can be used to directly specify the
power of 2 (e.g. otn_in_flight_order set to 19 is equivalent to
otn_in_fligh_number set to 524288).
The memory used to keep the nonce information will be the
otn_in_flight_no divided by 8 (only 1 bit of state is kept per nonce).
The default value is 1048576 (1M in-flight nonces, using 128Kb
memory).
See also: one_time_nonce and nid_pool_no.
Example 1.8. otn_in_flight_no example
...
modparam("auth", "otn_in_flight_no", 8388608) # 8 Mb (1Mb memory)
...
3.9. otn_in_flight_order (integer)
Equivalent to otn_in_flight_no, but instead of directly specifying the
size, its value is the power at which 2 should be raised
(log2(otn_in_flight_no)).
otn_in_flight_no = 2^otn_in_flight_order. For more details see
otn_in_flight_order.
The default value is 20 (1M in-flight nonces, using 128Kb memory).
See also: one_time_nonce, otn_in_flight_no and nid_pool_no.
Example 1.9. otn_in_flight_order example
...
modparam("auth", "otn_in_flight_order", 23) # 8 Mb (1Mb memory)
...
3.10. secret (string)
Secret phrase used to calculate the nonce value used to challenge the
client for authentication.
If you use multiple servers in your installation, and would like to
authenticate on the second server against the nonce generated at the
first one its necessary to explicitly set the secret to the same value
on all servers. However, as the use of a shared (and fixed) secret as
nonce is insecure, it is much better is to stay with the default. Any
clients should send the authenticated request to the server that
issued the challenge.
Default value is randomly generated string.
Example 1.10. Setting secret module parameter
...
modparam("auth", "secret", "johndoessecretphrase")
...
3.11. nonce_expire (integer)
Nonces have limited lifetime. After a given period of time nonces will
be considered invalid. This is to protect replay attacks. Credentials
containing a stale nonce will be not authorized, but the user agent
will be challenged again. This time the challenge will contain stale
parameter which will indicate to the client that it doesn't have to
disturb user by asking for username and password, it can recalculate
credentials using existing username and password.
The value is in seconds and default value is 300 seconds.
Example 1.11. nonce_expire example
...
modparam("auth", "nonce_expire", 600) # Set nonce_expire to 600s
...
3.12. nonce_auth_max_drift (integer)
Maximum difference in seconds between a nonce creation time and the
current time, if the nonce creation time appears to be in the future.
In some cases, like shortly after a system time backward adjustment or
when the current proxy is part of a cluster which is not
time-synchronized, it's possible to receive a nonce with creation time
in the future. In this case if the difference is greater then
nonce_auth_max_drift seconds, consider the nonce stale and
re-challenge (otherwise after a dramatic time change backwards, it
might happen that some previously generated nonces will be valid for
too much time).
The default value is 3 seconds
See also: nonce_expire.
Example 1.12. nonce_auth_max_drift example
...
modparam("auth", "nonce_auth_max_drift", 1) # set max drift to 1 s
...
3.13. force_stateless_reply (boolean)
If set to 1, www_challenge() and proxy_challenge() functions send
reply statelessly no matter if transaction exists or not. If set to 0
(default), reply is sent statefully if transaction exists and
stelelessly otherwise.
Example 1.13. force_stateless_reply example
...
modparam("auth", "force_stateless_reply", 1)
...
3.14. realm_prefix (string)
Prefix to be automatically strip from realm. As an alternative to SRV
records (not all SIP clients support SRV lookup), a subdomain of the
master domain can be defined for SIP purposes (like sip.mydomain.net
pointing to same IP address as the SRV record for mydomain.net). By
ignoring the realm_prefix "sip.", at authentication, sip.mydomain.net
will be equivalent to mydomain.net .
Default value is empty string.
Example 1.14. realm_prefix parameter example
modparam("auth", "realm_prefix", "sip.")
3.15. use_domain (boolean)
If set to 1, pv_auth_check() uses domain parts of the URIs to check
user identity.
Example 1.15. force_stateless_reply example
...
modparam("auth", "use_domain", 1)
...
4. Functions
4.1. consume_credentials()
4.2. has_credentials(realm)
4.3. www_challenge(realm, flags)
4.4. proxy_challenge(realm, flags)
4.5. auth_challenge(realm, flags)
4.6. pv_www_authenticate(realm, passwd, flags [, method])
4.7. pv_proxy_authenticate(realm, passwd, flags)
4.8. pv_auth_check(realm, passwd, flags, checks)
4.9. auth_get_www_authenticate(realm, flags, pvdest)
4.1. consume_credentials()
This function removes previously authorized credential headers from
the message being processed by the server. That means that the
downstream message will not contain credentials there were used by
this server. This ensures that the proxy will not reveal information
about credentials used to downstream elements and also the message
will be a little bit shorter. The function must be called after
www_authorize, proxy_authorize, www_authenticate or
proxy_authenticate.
Example 1.16. consume_credentials example
...
if (www_authenticate("realm", "subscriber")) {
consume_credentials();
};
...
4.2. has_credentials(realm)
This function returns true of the request has Autorization or
Proxy-Authorization header with provided realm. The parameter can be
string with pseudo-variables.
Example 1.17. consume_credentials example
...
if (has_credentials("myrealm")) {
...
}
...
4.3. www_challenge(realm, flags)
The function challenges a user agent. It will generate a WWW-Authorize
header field containing a digest challenge, it will put the header
field into a response generated from the request the server is
processing and send the reply. Upon reception of such a reply the user
agent should compute credentials and retry the request. For more
information regarding digest authentication see RFC2617. See module
parameter force_stateless_reply regarding sending of the reply.
Meaning of the parameters is as follows:
* realm - Realm is a opaque string that the user agent should
present to the user so he can decide what username and password to
use. Usually this is domain of the host the server is running on.
It must not be empty string "". In case of REGISTER requests, the
To header field domain (e.g., variable $td) can be used (because
this header field represents the user being registered), for all
other messages From header field domain can be used (e.g.,
variable $fd).
The string may contain pseudo variables.
* flags - Value of this parameter can be a bitmask of following:
+ 1 - build challenge header with qop=auth
+ 2 - build challenge header with qop=auth-int
+ 4 - do not send '500 Internal Server Error' reply
automatically in failure cases (error code is returned to
config)
+ 16 - build challenge header with stale=true
This function can be used from REQUEST_ROUTE.
Example 1.18. www_challenge usage
...
if (!www_authenticate("$td", "subscriber")) {
www_challenge("$td", "1");
}
...
4.4. proxy_challenge(realm, flags)
The function challenges a user agent. It will generate a
Proxy-Authorize header field containing a digest challenge, it will
put the header field into a response generated from the request the
server is processing and send the reply. Upon reception of such a
reply the user agent should compute credentials and retry the request.
For more information regarding digest authentication see RFC2617. See
module parameter force_stateless_reply regarding sending of the reply.
Meaning of the parameters is the same as for function
www_challenge(realm, flags)
This function can be used from REQUEST_ROUTE.
Example 1.19. proxy_challenge usage
...
if (!proxy_authenticate("$fd", "subscriber")) {
proxy_challenge("$fd", "1");
};
...
4.5. auth_challenge(realm, flags)
The function challenges a user agent for authentication. It combines
the functions www_challenge() and proxy_challenge(), by calling
internally the first one for REGISTER requests and the second one for
the rest of other request types.
Meaning of the parameters the same as for function
www_challenge(realm, flags)
This function can be used from REQUEST_ROUTE.
Example 1.20. auth_challenge usage
...
if (!auth_check("$fd", "subscriber", "1")) {
auth_challenge("$fd", "1");
};
...
4.6. pv_www_authenticate(realm, passwd, flags [, method])
The function verifies credentials according to RFC2617. If the
credentials are verified successfully then the function will succeed
and mark the credentials as authorized (marked credentials can be
later used by some other functions). If the function was unable to
verify the credentials for some reason then it will fail and the
script should call www_challenge which will challenge the user again.
Negative codes may be interpreted as follows:
* -1 (generic error) - some generic error occurred and no reply was
sent out;
* -2 (invalid password) - wrong password;
* -3 (invalid user) - authentication user does not exist.
* -4 (nonce expired) - the nonce has expired
* -5 (no credentials) - request does not contain an Authorization
header with the correct realm.
* -6 (nonce reused) - the nonce has already been used to
authenticate a previous request
Meaning of the parameters is as follows:
* realm - Realm is a opaque string that the user agent should
present to the user so he can decide what username and password to
use. Usually this is domain of the host the server is running on.
It must not be empty string "". In case of REGISTER requests To
header field domain (e.g., varibale $td) can be used (because this
header field represents a user being registered), for all other
messages From header field domain can be used (e.g., varibale
$fd).
The string may contain pseudo variables.
* passwd - the password to be used for authentication. Can contain
config variables. The Username is taken from Auth header.
* flags - the value of this parameter can be a bitmask of following:
+ 1 - the value of password parameter is HA1 format
+ 2 - build challenge header with no qop and add it to avp
+ 4 - build challenge header with qop=auth and add it to avp
+ 8 - build challenge header with qop=auth-int and add it to
avp
+ 16 - build challenge header with stale=true
* method - the method to be used for authentication. This parameter
is optional and if not set is the first "word" on the
request-line.
When challenge header is built and stored in avp, append_to_reply()
and the sl reply functions can be used to send appropriate SIP reply
to challenge for authentication.
This function can be used from REQUEST_ROUTE.
Example 1.21. pv_www_authenticate usage
...
if (!pv_www_authenticate("$td", "123abc", "0")) {
www_challenge("$td", "1");
};
...
4.7. pv_proxy_authenticate(realm, passwd, flags)
The function verifies credentials according to RFC2617. If the
credentials are verified successfully then the function will succeed
and mark the credentials as authorized (marked credentials can be
later used by some other functions). If the function was unable to
verify the credentials for some reason then it will fail and the
script should call proxy_challenge which will challenge the user
again. For more about the negative return codes, see the above
function.
Meaning of the parameters is the same as for
pv_www_authenticate(realm, passwd, flags)
This function can be used from REQUEST_ROUTE.
Example 1.22. pv_proxy_authenticate usage
...
$avp(password)="xyz";
if (!pv_proxy_authenticate("$fd", "$avp(password)", "0")) {
proxy_challenge("$fd", "1");
};
...
4.8. pv_auth_check(realm, passwd, flags, checks)
The function combines the functionalities of pv_www_authenticate and
pv_proxy_authenticate, first being exectuted if the SIP request is a
REGISTER, the second for the rest.
Meaning of the first three parameters is the same as for
pv_www_authenticate(realm, passwd, flags).
Parameter checks can be used to control the behaviour of the function.
If it is 1, then the function will check to see if the authentication
username matches either To or From header username, a matter of
whether it is for a REGISTER request or not. The parameter may be a
pseudo variable.
This function can be used from REQUEST_ROUTE.
Example 1.23. pv_auth_check usage
...
$avp(password)="xyz";
if (!pv_auth_check("$fd", "$avp(password)", "0", "1")) {
proxy_challenge("$fd", "1");
};
...
4.9. auth_get_www_authenticate(realm, flags, pvdest)
Build WWW-Authentication header and set the resulting value in
'pvdest' pseudo-variable parameter.
Meaning of the realm and flags parameters is the same as for
pv_www_authenticate(realm, passwd, flags)
This function can be used from ANY_ROUTE.
Example 1.24. auth_get_www_authenticate
...
if (auth_get_www_authenticate("$fd", "0", "$var(wauth)")) {
xlog("www authenticate header is [$var(wauth)]\n");
}
...
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