RE: "Shared secret is incorrect" - but it is identical!

Hi Ken, What happens if, using radtest, you specify the username *without* the realm from the remote machine? josh.

-----Original Message----- From: freeradius-users-bounces+j.howlett=ukerna.ac.uk@lists.freeradi us.org [mailto:freeradius-users-bounces+j.howlett=ukerna.ac.uk@lists. freeradius.org] On Behalf Of ken Sent: 03 July 2007 22:02 To: FreeRadius users mailing list Subject: "Shared secret is incorrect" - but it is identical!

I'm trying to get FreeRadius working on a Fedora Core 6 server with a view to eventually using it to authenticate against Windows Active Directory via ntlm_auth for the Janet Roaming Service. The first attempts at configuring it failed rather drastically so I went back to the beginning and I'm doing things one step at at time, making one-line changes to configs then using radtest and/or radclient to ensure it still works. I can now authenticate a users defined in users file, or in the Unix passwd file, from radtest on local machine. (i.e. the same one the server is running on). Next step is to check that I can use FreeRadius over the network by trying radclient on another machine.

It doesn't work from the networked machine. I see the "invalid signature (err=2)! (Shared secret is incorrect.)" message.

Debug log says to "double check the shared secret on the server". I have more than double checked it. I'm using the same shared secret on both machines. I "know" the shared secret is correct because it works from the local machine. But obviously it isn't! Because the encrypted password can't be read on the server. What can I do to make sure the shared secret truly is correct?

The definitions for both hosts are identical in the clients.conf file. At one point I manually edited them to swap the names of servers while leaving the secrets the same, just in case there was some hidden unprintable character - but the new local one still worked, proving that the two entries in the clients.conf file are in fact identical.

The shared secrets used in the radtest command are identical. I'm cutting and pasting the *same* radtest command in, not retyping it.

To test for sure I put radclient commands in scripts on the remote machine, where they failed. Then I ftped them from the machine they failed on to the other one - where they worked! So it *has* to be the same! And if I alter it in any way there then radtest fails so its not getting a free passage just because its local.

I have a horrid fear I've missed something totally obvious about how radclient works and that I'm doing something really really stupid stupid - but I can't see what. And I've been stuck here for over a week now. Any clues?

From the local machine I get:

=================== [ken@monstera ~]$ /usr/local/bin/radtest -d /etc/raddb username@bbk.ac.uk password server.IP.addr 122 sharedsecret Sending Access-Request of id 121 to server.IP.addr port 1812 User-Name = "username@bbk.ac.uk" User-Password = "password" NAS-IP-Address = 255.255.255.255 NAS-Port = 122 rad_recv: Access-Accept packet from host server.IP.addr:1812, id=121, length=20 ===================

But when I try from the remote machine I get:

=================== /usr/local/bin/radtest -d /etc/raddb username@bbk.ac.uk password server.IP.addr 122 sharedsecret Sending Access-Request of id 184 to server.IP.addr port 1812 User-Name = "username@bbk.ac.uk" User-Password = "password" NAS-IP-Address = 255.255.255.255 NAS-Port = 122 rad_recv: Access-Reject packet from host server.IP.addr:1812, id=184, length=20 rad_verify: Received Access-Reject packet from client server.IP.addr port 1812 with invalid signature (err=2)! (Shared secret is incorrect.) [ken@ficus ~]$ /usr/local/bin/radtest -d /etc/raddb username@bbk.ac.uk password server.IP.addr 122 sharedsecret Sending Access-Request of id 246 to server.IP.addr port 1812 User-Name = "username@bbk.ac.uk" User-Password = "password" NAS-IP-Address = 255.255.255.255 NAS-Port = 122 rad_recv: Access-Reject packet from host server.IP.addr:1812, id=246, length=20 rad_verify: Received Access-Reject packet from client server.IP.addr port 1812 with invalid signature (err=2)! (Shared secret is incorrect.) [ken@ficus ~]$ /usr/local/bin/radtest -d /etc/raddb username@bbk.ac.uk password server.IP.addr 122 sharedsecret Sending Access-Request of id 7 to server.IP.addr port 1812 User-Name = "username@bbk.ac.uk" User-Password = "password" NAS-IP-Address = 255.255.255.255 NAS-Port = 122 rad_recv: Access-Reject packet from host server.IP.addr:1812, id=7, length=20 rad_verify: Received Access-Reject packet from client server.IP.addr port 1812 with invalid signature (err=2)! (Shared secret is incorrect.) ==================

I strongly suspect that I am doing something stupid on the client side, because the same request works from the local server. But just in case its relevant, on the server in debug mode the failed transaction looks like this:

================== rad_recv: Access-Request packet from host client.IP.addr:32772, id=61, length=68 User-Name = "username@bbk.ac.uk" User-Password = "V\303\245\321\364Fb\334\373\275\242\203\\o6\264" NAS-IP-Address = 255.255.255.255 NAS-Port = 122 Processing the authorize section of radiusd.conf modcall: entering group authorize for request 9 modcall[authorize]: module "preprocess" returns ok for request 9 radius_xlat: '/var/log/radius/radacct/client.IP.addr/auth-detail-20070703' rlm_detail: /var/log/radius/radacct/%{Client-IP-Address}/auth-detail-%Y%m%d expands to /var/log/radius/radacct/client.IP.addr/auth-detail-20070703 modcall[authorize]: module "auth_log" returns ok for request 9 modcall[authorize]: module "chap" returns noop for request 9 modcall[authorize]: module "mschap" returns noop for request 9 rlm_realm: Looking up realm "bbk.ac.uk" for User-Name = "username@bbk.ac.uk" rlm_realm: Found realm "bbk.ac.uk" rlm_realm: Adding Stripped-User-Name = "username" rlm_realm: Proxying request from user username to realm bbk.ac.uk rlm_realm: Adding Realm = "bbk.ac.uk" rlm_realm: Authentication realm is LOCAL. modcall[authorize]: module "suffix" returns noop for request 9 rlm_eap: No EAP-Message, not doing EAP modcall[authorize]: module "eap" returns noop for request 9 users: Matched entry DEFAULT at line 20 modcall[authorize]: module "files" returns ok for request 9 rlm_pap: WARNING! No "known good" password found for the user. Authentication may fail because of this. modcall[authorize]: module "pap" returns noop for request 9 modcall: leaving group authorize (returns ok) for request 9 rad_check_password: Found Auth-Type System auth: type "System" Processing the authenticate section of radiusd.conf modcall: entering group authenticate for request 9 modcall[authenticate]: module "unix" returns notfound for request 9 modcall: leaving group authenticate (returns notfound) for request 9 auth: Failed to validate the user. WARNING: Unprintable characters in the password. ? Double-check the shared secret on the server and the NAS! Delaying request 9 for 1 seconds Finished request 9 Going to the next request --- Walking the entire request list --- Waking up in 1 seconds... --- Walking the entire request list --- Waking up in 1 seconds... --- Walking the entire request list --- Sending Access-Reject of id 61 to client.IP.addr port 32772 Waking up in 4 seconds... --- Walking the entire request list --- Cleaning up request 9 ID 61 with timestamp 468aaada Nothing to do. Sleeping until we see a request. ==================

And a successful one looks like this - the obvious difference is that the password is in clear (though I have obfuscated it here) - as would be expected if there was no shared secret.

================== rad_recv: Access-Request packet from host server.IP.addr:32770, id=170, length=46 User-Name = "username" User-Password = "password" Processing the authorize section of radiusd.conf modcall: entering group authorize for request 10 modcall[authorize]: module "preprocess" returns ok for request 10 radius_xlat: '/var/log/radius/radacct/server.IP.addr/auth-detail-20070703' rlm_detail: /var/log/radius/radacct/%{Client-IP-Address}/auth-detail-%Y%m%d expands to /var/log/radius/radacct/server.IP.addr/auth-detail-20070703 modcall[authorize]: module "auth_log" returns ok for request 10 modcall[authorize]: module "chap" returns noop for request 10 modcall[authorize]: module "mschap" returns noop for request 10 rlm_realm: No '@' in User-Name = "username", looking up realm NULL rlm_realm: Found realm "NULL" rlm_realm: Adding Stripped-User-Name = "username" rlm_realm: Proxying request from user username to realm NULL rlm_realm: Adding Realm = "NULL" rlm_realm: Authentication realm is LOCAL. modcall[authorize]: module "suffix" returns noop for request 10 rlm_eap: No EAP-Message, not doing EAP modcall[authorize]: module "eap" returns noop for request 10 users: Matched entry username at line 2 modcall[authorize]: module "files" returns ok for request 10 rlm_pap: Found existing Auth-Type, not changing it. modcall[authorize]: module "pap" returns noop for request 10 modcall: leaving group authorize (returns ok) for request 10 rad_check_password: Found Auth-Type Local auth: type Local auth: user supplied User-Password matches local User-Password Processing the post-auth section of radiusd.conf modcall: entering group post-auth for request 10 radius_xlat: '/var/log/radius/radacct/server.IP.addr/reply-detail-20070703' rlm_detail: /var/log/radius/radacct/%{Client-IP-Address}/reply-detail-%Y%m%d expands to /var/log/radius/radacct/server.IP.addr/reply-detail-20070703 modcall[post-auth]: module "reply_log" returns ok for request 10 modcall: leaving group post-auth (returns ok) for request 10 Sending Access-Accept of id 170 to server.IP.addr port 32770 Finished request 10 Going to the next request --- Walking the entire request list --- Waking up in 6 seconds... --- Walking the entire request list --- Cleaning up request 10 ID 170 with timestamp 468aab69 Nothing to do. Sleeping until we see a ==================

Debug of startup looks like this (same in both cases obviously). I made new conf files to contain any local changes I might make & to yhelp me find my way aroudn radiusd.conf more easily - but they are just the sections of conf I might want to change pulled out and INCLUDEd back in so no substantial change:

================== /usr/local/sbin/radiusd -X -d /etc/raddb Starting - reading configuration files ... reread_config: reading radiusd.conf Config: including file: /etc/raddb/bbk_fr_listen.conf Config: including file: /etc/raddb/bbk_fr_security.conf Config: including file: /etc/raddb/proxy.conf Config: including file: /etc/raddb/clients.conf Config: including file: /etc/raddb/snmp.conf Config: including file: /etc/raddb/eap.conf Config: including file: /etc/raddb/bbk_fr_mschap.conf Config: including file: /etc/raddb/bbk_fr_ldap.conf Config: including file: /etc/raddb/bbk_fr_passwd.conf Config: including file: /etc/raddb/bbk_fr_realms.conf Config: including file: /etc/raddb/bbk_fr_details.conf Config: including file: /etc/raddb/sql.conf Config: including file: /etc/raddb/bbk_fr_radutmp.conf Config: including file: /etc/raddb/bbk_fr_counters.conf Config: including file: /etc/raddb/bbk_fr_exec.conf Config: including file: /etc/raddb/bbk_fr_ippool.conf main: prefix = "/usr/local" main: localstatedir = "/var" main: logdir = "/var/log/radius" main: libdir = "/usr/local/lib" main: radacctdir = "/var/log/radius/radacct" main: hostname_lookups = no main: max_request_time = 30 main: cleanup_delay = 5 main: max_requests = 1024 main: delete_blocked_requests = 0 main: port = 0 main: allow_core_dumps = no main: log_stripped_names = no main: log_file = "/var/log/radius/radius.log" main: log_auth = no main: log_auth_badpass = no main: log_auth_goodpass = no main: pidfile = "/var/run/radiusd/radiusd.pid" main: user = "(null)" main: group = "(null)" main: usercollide = no main: lower_user = "no" main: lower_pass = "no" main: nospace_user = "no" main: nospace_pass = "no" main: checkrad = "/usr/local/sbin/checkrad" main: proxy_requests = yes proxy: retry_delay = 5 proxy: retry_count = 3 proxy: synchronous = no proxy: default_fallback = yes proxy: dead_time = 120 proxy: post_proxy_authorize = no proxy: wake_all_if_all_dead = no security: max_attributes = 200 security: reject_delay = 1 security: status_server = yes main: debug_level = 0 read_config_files: reading dictionary read_config_files: reading naslist Using deprecated naslist file. Support for this will go away soon. read_config_files: reading clients read_config_files: reading realms radiusd: entering modules setup Module: Library search path is /usr/local/lib Module: Loaded exec exec: wait = yes exec: program = "(null)" exec: input_pairs = "request" exec: output_pairs = "(null)" exec: packet_type = "(null)" rlm_exec: Wait=yes but no output defined. Did you mean output=none? Module: Instantiated exec (exec) Module: Loaded expr Module: Instantiated expr (expr) Module: Loaded PAP pap: encryption_scheme = "crypt" pap: auto_header = yes Module: Instantiated pap (pap) Module: Loaded CHAP Module: Instantiated chap (chap) Module: Loaded MS-CHAP mschap: use_mppe = yes mschap: require_encryption = yes mschap: require_strong = yes mschap: with_ntdomain_hack = yes mschap: passwd = "(null)" mschap: ntlm_auth = "/usr/bin/ntlm_auth --request-nt-key --username=%{Stripped-User-Name:-%{User-Name:-None}} --challenge=%{mschap:Challenge:-00} --nt-response=%{mschap:NT-Response:-00}" Module: Instantiated mschap (mschap) Module: Loaded System unix: cache = no unix: passwd = "(null)" unix: shadow = "(null)" unix: group = "(null)" unix: radwtmp = "/var/log/radius/radwtmp" unix: usegroup = no unix: cache_reload = 600 Module: Instantiated unix (unix) Module: Loaded eap eap: default_eap_type = "peap" eap: timer_expire = 60 eap: ignore_unknown_eap_types = no eap: cisco_accounting_username_bug = no rlm_eap: Loaded and initialized type md5 rlm_eap: Loaded and initialized type leap gtc: challenge = "Password: " gtc: auth_type = "PAP" rlm_eap: Loaded and initialized type gtc tls: rsa_key_exchange = no tls: dh_key_exchange = yes tls: rsa_key_length = 512 tls: dh_key_length = 512 tls: verify_depth = 0 tls: CA_path = "(null)" tls: pem_file_type = yes tls: private_key_file = "/etc/raddb/certs/radius2.bbk.ac.uk.key" tls: certificate_file = "/etc/raddb/certs/radius2.bbk.ac.uk.pem" tls: CA_file = "/etc/raddb/certs/ct_root.pem" tls: private_key_password = "whatever" tls: dh_file = "/etc/raddb/certs/dh" tls: random_file = "/dev/urandom" tls: fragment_size = 1024 tls: include_length = yes tls: check_crl = no tls: check_cert_cn = "(null)" tls: cipher_list = "(null)" tls: check_cert_issuer = "(null)" rlm_eap_tls: Loading the certificate file as a chain rlm_eap: Loaded and initialized type tls peap: default_eap_type = "mschapv2" peap: copy_request_to_tunnel = no peap: use_tunneled_reply = no peap: proxy_tunneled_request_as_eap = yes rlm_eap: Loaded and initialized type peap mschapv2: with_ntdomain_hack = no rlm_eap: Loaded and initialized type mschapv2 Module: Instantiated eap (eap) Module: Loaded preprocess preprocess: huntgroups = "/etc/raddb/huntgroups" preprocess: hints = "/etc/raddb/hints" preprocess: with_ascend_hack = no preprocess: ascend_channels_per_line = 23 preprocess: with_ntdomain_hack = no preprocess: with_specialix_jetstream_hack = no preprocess: with_cisco_vsa_hack = no preprocess: with_alvarion_vsa_hack = no Module: Instantiated preprocess (preprocess) Module: Loaded detail detail: detailfile = "/var/log/radius/radacct/%{Client-IP-Address}/auth-detail-%Y%m%d" detail: detailperm = 384 detail: dirperm = 493 detail: locking = no Module: Instantiated detail (auth_log) Module: Loaded realm realm: format = "suffix" realm: delimiter = "@" realm: ignore_default = no realm: ignore_null = no Module: Instantiated realm (suffix) Module: Loaded files files: usersfile = "/etc/raddb/users" files: acctusersfile = "/etc/raddb/acct_users" files: preproxy_usersfile = "/etc/raddb/preproxy_users" files: compat = "no" Module: Instantiated files (files) Module: Loaded Acct-Unique-Session-Id acct_unique: key = "User-Name, Acct-Session-Id, NAS-IP-Address, Client-IP-Address, NAS-Port" Module: Instantiated acct_unique (acct_unique) detail: detailfile = "/var/log/radius/radacct/%{Client-IP-Address}/detail-%Y%m%d" detail: detailperm = 384 detail: dirperm = 493 detail: locking = no Module: Instantiated detail (detail) Module: Loaded radutmp radutmp: filename = "/var/log/radius/radutmp" radutmp: username = "%{User-Name}" radutmp: case_sensitive = yes radutmp: check_with_nas = yes radutmp: perm = 384 radutmp: callerid = yes Module: Instantiated radutmp (radutmp) detail: detailfile = "/var/log/radius/radacct/%{Client-IP-Address}/pre-proxy-detail-%Y%m%d" detail: detailperm = 384 detail: dirperm = 493 detail: locking = no Module: Instantiated detail (pre_proxy_log) detail: detailfile = "/var/log/radius/radacct/%{Client-IP-Address}/post-proxy-detai l-%Y%m%d" detail: detailperm = 384 detail: dirperm = 493 detail: locking = no Module: Instantiated detail (post_proxy_log) detail: detailfile = "/var/log/radius/radacct/%{Client-IP-Address}/reply-detail-%Y%m%d" detail: detailperm = 384 detail: dirperm = 493 detail: locking = no Module: Instantiated detail (reply_log) Listening on authentication *:1812 Listening on accounting *:1813 Listening on proxy *:1814 Ready to process requests.

==================

FreeRADIUS Version 1.1.5, for host i686-pc-linux-gnu, built on Mar 9 2007 at 15:07:40

The configurations are minimal:

relevant entries in clients file:

================== client nnn.nnn.nnn.nnn { secret = sharedsecret shortname = monstera nastype = other } client nnn.nnn.nnn.nnn { secret = sharedsecret shortname = ficus nastype = other } ==================

relevant entry in users file

================== username Auth-Type := Local, User-Password == "password" ==================

As I said, authentication works for the host on which Freeradius is running, but not on the other. - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html