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add CASRedirectAfterValidation parameter to mimic java-cas-client's parameter #136

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add CASRedirectAfterValidation parameter to mimic java-cas-client's parameter #136

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eba7841
add CASRedirectAfterValidation parameter to mimic java-cas-client's r…
ruckc Nov 3, 2017
512f34e
adjust based on PR-136 comments
ruckc Nov 28, 2017
2fda608
adjust README verbiage for CASDisableRedirectAfterValidation
ruckc Nov 28, 2017
70b6112
add additional return OK
ruckc Nov 29, 2017
9675e4f
Merge branch 'redirectAfterValidation' of https://github.com/ruckc/mo…
ruckc Nov 29, 2017
c2e865e
try fixing mod_auth_cas too many redirects
ruckc Dec 14, 2017
71905b4
revert last commit
ruckc Dec 14, 2017
01c2221
Merge branch 'master' into redirectAfterValidation
ruckc Jan 30, 2020
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8 changes: 8 additions & 0 deletions README
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Original file line number Diff line number Diff line change
Expand Up @@ -214,6 +214,14 @@ Default: NULL
Description: The URL to use when performing a proxy validation. This is currently
an unimplemented feature, so setting this will have no effect.

Directive: CASDisableRedirectAfterValidation
Default: Off
Description: Normal requests that contain a ticket parameter have that removed by sending
a 302 redirect with ticket removed in the URL. Turning this parameter On
disables the automatic/forced 302 redirects. Turning this on is helpful when
clients can't automatically follow the redirect, or this is a POST request with
a POST body already submitted.

Directive: CASRootProxiedAs
Default: NULL
Description: This URL represents the URL that end users may see in the event that
Expand Down
57 changes: 38 additions & 19 deletions src/mod_auth_cas.c
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Original file line number Diff line number Diff line change
Expand Up @@ -199,6 +199,7 @@ void *cas_create_dir_config(apr_pool_t *pool, char *path)
c->CASGatewayCookie = CAS_DEFAULT_GATEWAY_COOKIE;
c->CASAuthNHeader = CAS_DEFAULT_AUTHN_HEADER;
c->CASScrubRequestHeaders = CAS_DEFAULT_SCRUB_REQUEST_HEADERS;
c->CASDisableRedirectAfterValidation = CAS_DEFAULT_DISABLE_REDIRECT_AFTER_VALIDATION;
return(c);
}

Expand Down Expand Up @@ -242,6 +243,12 @@ void *cas_merge_dir_config(apr_pool_t *pool, void *BASE, void *ADD)
if(add->CASScrubRequestHeaders != NULL && apr_strnatcasecmp(add->CASScrubRequestHeaders, "Off") == 0)
c->CASScrubRequestHeaders = NULL;

c->CASDisableRedirectAfterValidation = (add->CASDisableRedirectAfterValidation != CAS_DEFAULT_DISABLE_REDIRECT_AFTER_VALIDATION ?
add->CASDisableRedirectAfterValidation :
base->CASDisableRedirectAfterValidation);
if(add->CASDisableRedirectAfterValidation != NULL && apr_strnatcasecmp(add->CASDisableRedirectAfterValidation, "Off") == 0)
c->CASDisableRedirectAfterValidation = NULL;

return(c);
}

Expand Down Expand Up @@ -1902,11 +1909,16 @@ char *getResponseFromServer (request_rec *r, cas_cfg *c, char *ticket)
else
validateURL.query = apr_psprintf(r->pool, "TARGET=%s%s", getCASService(r, c), getCASRenew(r));

if(c->CASDebug)
ap_log_rerror(APLOG_MARK,APLOG_DEBUG,0,r,"MOD_AUTH_CAS: validateUrl: %s", apr_uri_unparse(r->pool, &validateURL, 0));

curl_easy_setopt(curl, CURLOPT_URL, apr_uri_unparse(r->pool, &validateURL, 0));

if(curl_easy_perform(curl) != CURLE_OK) {
if(c->CASDebug)
if(c->CASDebug) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "MOD_AUTH_CAS: query: %s", validateURL.query);
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I'd probably move the previous log addition to line 1855 after validateURL.query is set so we get the whole validateURL printed out.

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This was moved. Good catch.

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The log at line 1858 is redundant since it's logged at 1852 now.

ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "MOD_AUTH_CAS: curl_easy_perform() failed (%s)", curlError);
}
goto out;
}

Expand Down Expand Up @@ -2217,29 +2229,35 @@ int cas_authenticate(request_rec *r)
if(d->CASAuthNHeader != NULL)
apr_table_set(r->headers_in, d->CASAuthNHeader, remoteUser);

if(parametersRemoved == TRUE) {
if(ssl == TRUE && port != 443)
printPort = TRUE;
else if(port != 80)
printPort = TRUE;

if(c->CASRootProxiedAs.is_initialized) {
if(d->CASDisableRedirectAfterValidation == NULL) {
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Why not:

                       if(d->CASDisableRedirectAfterValidation) {
                               return OK;
                       }

and keep everything in the "if(parametersRemoved == TRUE)" unchanged? The patch and code are much more readable like that.

if(parametersRemoved == TRUE) {
if(ssl == TRUE && port != 443)
printPort = TRUE;
else if(port != 80)
printPort = TRUE;

if(c->CASRootProxiedAs.is_initialized) {
newLocation = apr_psprintf(r->pool, "%s%s%s%s", apr_uri_unparse(r->pool, &c->CASRootProxiedAs, 0), r->uri, ((r->args != NULL) ? "?" : ""), ((r->args != NULL) ? r->args : ""));
} else {
} else {
#ifdef APACHE2_0
if(printPort == TRUE)
newLocation = apr_psprintf(r->pool, "%s://%s:%u%s%s%s", ap_http_method(r), r->server->server_hostname, r->connection->local_addr->port, r->uri, ((r->args != NULL) ? "?" : ""), ((r->args != NULL) ? r->args : ""));
else
newLocation = apr_psprintf(r->pool, "%s://%s%s%s%s", ap_http_method(r), r->server->server_hostname, r->uri, ((r->args != NULL) ? "?" : ""), ((r->args != NULL) ? r->args : ""));
if(printPort == TRUE)
newLocation = apr_psprintf(r->pool, "%s://%s:%u%s%s%s", ap_http_method(r), r->server->server_hostname, r->connection->local_addr->port, r->uri, ((r->args != NULL) ? "?" : ""), ((r->args != NULL) ? r->args : ""));
else
newLocation = apr_psprintf(r->pool, "%s://%s%s%s%s", ap_http_method(r), r->server->server_hostname, r->uri, ((r->args != NULL) ? "?" : ""), ((r->args != NULL) ? r->args : ""));
#else
if(printPort == TRUE)
newLocation = apr_psprintf(r->pool, "%s://%s:%u%s%s%s", ap_http_scheme(r), r->server->server_hostname, r->connection->local_addr->port, r->uri, ((r->args != NULL) ? "?" : ""), ((r->args != NULL) ? r->args : ""));
else
newLocation = apr_psprintf(r->pool, "%s://%s%s%s%s", ap_http_scheme(r), r->server->server_hostname, r->uri, ((r->args != NULL) ? "?" : ""), ((r->args != NULL) ? r->args : ""));
if(printPort == TRUE)
newLocation = apr_psprintf(r->pool, "%s://%s:%u%s%s%s", ap_http_scheme(r), r->server->server_hostname, r->connection->local_addr->port, r->uri, ((r->args != NULL) ? "?" : ""), ((r->args != NULL) ? r->args : ""));
else
newLocation = apr_psprintf(r->pool, "%s://%s%s%s%s", ap_http_scheme(r), r->server->server_hostname, r->uri, ((r->args != NULL) ? "?" : ""), ((r->args != NULL) ? r->args : ""));
#endif
}
if(c->CASDebug)
ap_log_rerror(APLOG_MARK,APLOG_DEBUG,0,r,"Sending 302 redirect (%s)", newLocation);
apr_table_add(r->headers_out, "Location", newLocation);
return HTTP_MOVED_TEMPORARILY;
} else {
return OK;
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Is it intended that we go all the way to https://github.com/ruckc/mod_auth_cas/blob/eba78415e60b2d597c5ee03afd5245f53129a15a/src/mod_auth_cas.c#L2231 to return OK? Should it return before that?

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The return OK; was unmodified (except additional indention).

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It's now inside the if block that checks CASDisableRedirectAfterValidation ( eba7841#diff-b823cf0e10152100b941acd0fb5838a8R2141 ), so it never returns if CASDisableRedirectAfterValidation is On.

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I added an additional } else { return OK; }. In my office environment I had caught this but forgot to commit it back.

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@dhawes dhawes Nov 30, 2017 •
edited
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If that's the intention, this can be simplified by changing the check to:

if(parametersRemoved == TRUE && d->CASDisableRedirectAfterValidation == NULL )

I mostly ask because the original merge request would fall through to a later return where cas attributes were populated and headers were set. The side effect of this is that Require cas-attribute statements would work. In this commit that won't happen, so authorization will fail. What is desired here?

}
apr_table_add(r->headers_out, "Location", newLocation);
return HTTP_MOVED_TEMPORARILY;
} else {
return OK;
}
Expand Down Expand Up @@ -2904,6 +2922,7 @@ const command_rec cas_cmds [] = {
AP_INIT_TAKE1("CASTimeout", cfg_readCASParameter, (void *) cmd_session_timeout, RSRC_CONF, "Maximum time (in seconds) a session cookie is valid for, regardless of idle time. Set to 0 to allow non-idle sessions to never expire"),
AP_INIT_TAKE1("CASIdleTimeout", cfg_readCASParameter, (void *) cmd_idle_timeout, RSRC_CONF, "Maximum time (in seconds) a session can be idle for"),
AP_INIT_TAKE1("CASCacheCleanInterval", cfg_readCASParameter, (void *) cmd_cache_interval, RSRC_CONF, "Amount of time (in seconds) between cache cleanups. This value is checked when a new local ticket is issued or when a ticket expires."),
AP_INIT_TAKE1("CASDisableRedirectAfterValidation", ap_set_string_slot, (void *) APR_OFFSETOF(cas_dir_cfg, CASDisableRedirectAfterValidation), ACCESS_CONF, "Set 'On' to not send a 302 redirect to remove the ticket parameter after ticket validation"),
AP_INIT_TAKE1("CASRootProxiedAs", cfg_readCASParameter, (void *) cmd_root_proxied_as, RSRC_CONF, "URL used to access the root of the virtual server (only needed when the server is proxied)"),
AP_INIT_TAKE1("CASScrubRequestHeaders", ap_set_string_slot, (void *) APR_OFFSETOF(cas_dir_cfg, CASScrubRequestHeaders), ACCESS_CONF, "Scrub CAS user name and SAML attribute headers from the user's request."),
/* authorization options */
Expand Down
2 changes: 2 additions & 0 deletions src/mod_auth_cas.h
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Expand Up @@ -87,6 +87,7 @@
#define CAS_DEFAULT_VALIDATE_V2_URL NULL
#define CAS_DEFAULT_VALIDATE_URL CAS_DEFAULT_VALIDATE_V2_URL
#define CAS_DEFAULT_PROXY_VALIDATE_URL NULL
#define CAS_DEFAULT_DISABLE_REDIRECT_AFTER_VALIDATION NULL
#define CAS_DEFAULT_ROOT_PROXIED_AS_URL NULL
#define CAS_DEFAULT_COOKIE_ENTROPY 32
#define CAS_DEFAULT_COOKIE_DOMAIN NULL
Expand Down Expand Up @@ -152,6 +153,7 @@ typedef struct cas_dir_cfg {
char *CASGatewayCookie;
char *CASAuthNHeader;
char *CASScrubRequestHeaders;
char *CASDisableRedirectAfterValidation;
} cas_dir_cfg;

typedef struct cas_cache_entry {
Expand Down