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clixon/example/main/example_restconf.c
Olof hagsand a8d29b1e7e * Restconf authentication callback (ca_auth) signature changed 
* Not backward compatible: All uses of the ca-auth callback in restconf plugins must be changed
  * New version is: `int ca_auth(h, req, auth_type, authp, userp)`
    * where `auth_type` is the requested authentication-type (none, client-cert or user-defined)
    * `authp` is the returned authentication flag
    * `userp` is the returned associated authenticated user
    * and the return value is three-valued: -1: Error, 0: not handled, 1: OK
  * For more info see [clixon-docs/restconf](https://clixon-docs.readthedocs.io/en/latest/restconf.html)
2021-03-07 15:34:26 +01:00

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/*
*
***** BEGIN LICENSE BLOCK *****
Copyright (C) 2009-2016 Olof Hagsand and Benny Holmgren
Copyright (C) 2017-2019 Olof Hagsand
Copyright (C) 2020-2021 Olof Hagsand and Rubicon Communications, LLC(Netgat)e
This file is part of CLIXON.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Alternatively, the contents of this file may be used under the terms of
the GNU General Public License Version 3 or later (the "GPL"),
in which case the provisions of the GPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of the GPL, and not to allow others to
use your version of this file under the terms of Apache License version 2,
indicate your decision by deleting the provisions above and replace them with
the notice and other provisions required by the GPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the Apache License version 2 or the GPL.
***** END LICENSE BLOCK *****
*
* This code uses WITH_RESTCONF_FCGI to identify its run with fcgi intreface for ca_auth
* This should be changed.
*/
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include <signal.h>
/* cligen */
#include <cligen/cligen.h>
/* clicon */
#include <clixon/clixon.h>
#include <clixon/clixon_restconf.h> /* minor use */
/* Command line options to be passed to getopt(3)
*/
#define RESTCONF_EXAMPLE_OPTS ""
static const char Base64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const char Pad64 = '=';
/* skips all whitespace anywhere.
converts characters, four at a time, starting at (or after)
src from base - 64 numbers into three 8 bit bytes in the target area.
it returns the number of data bytes stored at the target, or -1 on error.
@note what is copyright of this?
*/
int
b64_decode(const char *src,
char *target,
size_t targsize)
{
int tarindex, state, ch;
char *pos;
state = 0;
tarindex = 0;
while ((ch = *src++) != '\0') {
if (isspace(ch)) /* Skip whitespace anywhere. */
continue;
if (ch == Pad64)
break;
pos = strchr(Base64, ch);
if (pos == 0) /* A non-base64 character. */
return (-1);
switch (state) {
case 0:
if (target) {
if ((size_t)tarindex >= targsize)
return (-1);
target[tarindex] = (pos - Base64) << 2;
}
state = 1;
break;
case 1:
if (target) {
if ((size_t)tarindex + 1 >= targsize)
return (-1);
target[tarindex] |= (pos - Base64) >> 4;
target[tarindex+1] = ((pos - Base64) & 0x0f)
<< 4 ;
}
tarindex++;
state = 2;
break;
case 2:
if (target) {
if ((size_t)tarindex + 1 >= targsize)
return (-1);
target[tarindex] |= (pos - Base64) >> 2;
target[tarindex+1] = ((pos - Base64) & 0x03)
<< 6;
}
tarindex++;
state = 3;
break;
case 3:
if (target) {
if ((size_t)tarindex >= targsize)
return (-1);
target[tarindex] |= (pos - Base64);
}
tarindex++;
state = 0;
break;
default:
return -1;
}
}
/*
* We are done decoding Base-64 chars. Let's see if we ended
* on a byte boundary, and/or with erroneous trailing characters.
*/
if (ch == Pad64) { /* We got a pad char. */
ch = *src++; /* Skip it, get next. */
switch (state) {
case 0: /* Invalid = in first position */
case 1: /* Invalid = in second position */
return (-1);
case 2: /* Valid, means one byte of info */
/* Skip any number of spaces. */
for ((void)NULL; ch != '\0'; ch = *src++)
if (!isspace(ch))
break;
/* Make sure there is another trailing = sign. */
if (ch != Pad64)
return (-1);
ch = *src++; /* Skip the = */
/* Fall through to "single trailing =" case. */
/* FALLTHROUGH */
case 3: /* Valid, means two bytes of info */
/*
* We know this char is an =. Is there anything but
* whitespace after it?
*/
for ((void)NULL; ch != '\0'; ch = *src++)
if (!isspace(ch))
return (-1);
/*
* Now make sure for cases 2 and 3 that the "extra"
* bits that slopped past the last full byte were
* zeros. If we don't check them, they become a
* subliminal channel.
*/
if (target && target[tarindex] != 0)
return (-1);
}
} else {
/*
* We ended by seeing the end of the string. Make sure we
* have no partial bytes lying around.
*/
if (state != 0)
return (-1);
}
return (tarindex);
}
/*! HTTP basic authentication example (note hardwired)
* @param[in] h Clicon handle
* @param[in] req Per-message request www handle to use with restconf_api.h
* @param[out] authp NULL: Credentials failed, no user set (401 returned).
* String: Credentials OK, the associated user, must be mallloc:ed
* Parameter signtificant only if retval is 1/OK
* @retval -1 Fatal error
* @retval 0 Ignore, undecided, not handled, same as no callback
* @retval 1 OK, see authp parameter for result.
* @note authp should be malloced
* @note: Three hardwired users: andy, wilma, guest w password "bar".
*/
static int
example_basic_auth(clicon_handle h,
void *req,
char **authp)
{
int retval = -1;
cxobj *xt = NULL;
char *user = NULL;
cbuf *cb = NULL;
char *auth;
char *passwd;
char *passwd2 = "";
size_t authlen;
int ret;
clicon_debug(1, "%s", __FUNCTION__);
if (authp == NULL){
clicon_err(OE_PLUGIN, EINVAL, "Authp output parameter is NULL");
goto done;
}
/* At this point in the code we must use HTTP basic authentication */
if ((auth = restconf_param_get(h, "HTTP_AUTHORIZATION")) == NULL)
goto fail;
if (strlen(auth) < strlen("Basic "))
goto fail;
if (strncmp("Basic ", auth, strlen("Basic ")))
goto fail;
auth += strlen("Basic ");
authlen = strlen(auth)*2;
if ((user = malloc(authlen)) == NULL){
clicon_err(OE_UNIX, errno, "malloc");
goto done;
}
memset(user, 0, authlen);
if ((ret = b64_decode(auth, user, authlen)) < 0)
goto done;
/* auth string is on the format user:passwd */
if ((passwd = index(user,':')) == NULL)
goto fail;
*passwd = '\0';
passwd++;
clicon_debug(1, "%s http user:%s passwd:%s", __FUNCTION__, user, passwd);
/* Here get auth sub-tree where all the users are */
if ((cb = cbuf_new()) == NULL)
goto done;
/* XXX Three hardcoded user/passwd (from RFC8341 A.1)*/
if (strcmp(user, "wilma")==0 || strcmp(user, "andy")==0 ||
strcmp(user, "guest")==0){
passwd2 = "bar";
}
if (strcmp(passwd, passwd2))
goto fail;
*authp = user; /* authenticated */
user=NULL; /* to avoid free below */
retval = 1;
done: /* error */
clicon_debug(1, "%s retval:%d authp:%s", __FUNCTION__, retval, *authp);
if (user)
free(user);
if (cb)
cbuf_free(cb);
if (xt)
xml_free(xt);
return retval;
fail: /* unauthenticated */
*authp = NULL;
retval = 1;
goto done;
}
/*! HTTP "no auth" but uses basic authentication to get a user
* @param[in] h Clicon handle
* @param[in] req Per-message request www handle to use with restconf_api.h
* @param[out] authp NULL: Credentials failed, no user set (401 returned).
* String: Credentials OK, the associated user, must be mallloc:ed
* Parameter signtificant only if retval is 1/OK
* @retval -1 Fatal error
* @retval 0 Ignore, undecided, not handled, same as no callback
* @retval 1 OK, see authp parameter for result.
* @note authp should be malloced
*/
static int
example_no_auth(clicon_handle h,
void *req,
char **authp)
{
int retval = -1;
cxobj *xt = NULL;
char *user = NULL;
cbuf *cb = NULL;
char *auth;
char *passwd;
size_t authlen;
int ret;
clicon_debug(1, "%s", __FUNCTION__);
if (authp == NULL){
clicon_err(OE_PLUGIN, EINVAL, "Authp output parameter is NULL");
goto done;
}
/* At this point in the code we must use HTTP basic authentication */
if ((auth = restconf_param_get(h, "HTTP_AUTHORIZATION")) == NULL)
goto fail;
if (strlen(auth) < strlen("Basic "))
goto fail;
if (strncmp("Basic ", auth, strlen("Basic ")))
goto fail;
auth += strlen("Basic ");
authlen = strlen(auth)*2;
if ((user = malloc(authlen)) == NULL){
clicon_err(OE_UNIX, errno, "malloc");
goto done;
}
memset(user, 0, authlen);
if ((ret = b64_decode(auth, user, authlen)) < 0)
goto done;
/* auth string is on the format user:passwd */
if ((passwd = index(user,':')) == NULL)
goto fail;
*passwd = '\0';
passwd++;
clicon_debug(1, "%s http user:%s passwd:%s", __FUNCTION__, user, passwd);
*authp = user; /* authenticated */
user=NULL; /* to avoid free below */
retval = 1;
done: /* error */
clicon_debug(1, "%s retval:%d authp:%s", __FUNCTION__, retval, *authp);
if (user)
free(user);
if (cb)
cbuf_free(cb);
if (xt)
xml_free(xt);
return retval;
fail: /* unauthenticated */
*authp = NULL;
retval = 0; /* Ignore use anonymous */
goto done;
}
/*! Authentication callback
* @param[in] h Clicon handle
* @param[in] req Per-message request www handle to use with restconf_api.h
* @param[in] auth_type Authentication type: none, user-defined, or client-cert
* @param[out] authp NULL: Credentials failed, no user set (401 returned).
* String: Credentials OK, the associated user, must be mallloc:ed
* Parameter signtificant only if retval is 1/OK
* @retval -1 Fatal error
* @retval 0 Ignore, undecided, not handled, same as no callback
* @retval 1 OK, see authp parameter for result.
* @note authp should be malloced
*/
int
example_restconf_credentials(clicon_handle h,
void *req,
clixon_auth_type_t auth_type,
char **authp)
{
int retval = -1;
clicon_debug(1, "%s auth:%s", __FUNCTION__, clixon_auth_type_int2str(auth_type));
switch (auth_type){
case CLIXON_AUTH_NONE:
if ((retval = example_no_auth(h, req, authp)) < 0)
goto done;
break;
case CLIXON_AUTH_CLIENT_CERTIFICATE:
retval = 0; /* Ignore, use default */
break;
case CLIXON_AUTH_USER:
if ((retval = example_basic_auth(h, req, authp)) < 0)
goto done;
break;
}
done:
clicon_debug(1, "%s retval:%d authp:%s", __FUNCTION__, retval, *authp);
return retval;
}
/*! Local example restconf rpc callback
*/
int
restconf_client_rpc(clicon_handle h,
cxobj *xe,
cbuf *cbret,
void *arg,
void *regarg)
{
int retval = -1;
cxobj *x = NULL;
char *namespace;
/* get namespace from rpc name, return back in each output parameter */
if ((namespace = xml_find_type_value(xe, NULL, "xmlns", CX_ATTR)) == NULL){
clicon_err(OE_XML, ENOENT, "No namespace given in rpc %s", xml_name(xe));
goto done;
}
cprintf(cbret, "<rpc-reply xmlns=\"%s\">", NETCONF_BASE_NAMESPACE);
if (!xml_child_nr_type(xe, CX_ELMNT))
cprintf(cbret, "<ok/>");
else while ((x = xml_child_each(xe, x, CX_ELMNT)) != NULL) {
if (xmlns_set(x, NULL, namespace) < 0)
goto done;
if (clicon_xml2cbuf(cbret, x, 0, 0, -1) < 0)
goto done;
}
cprintf(cbret, "</rpc-reply>");
retval = 0;
done:
return retval;
}
/*! Start example restonf plugin. Set authentication method
*/
int
example_restconf_start(clicon_handle h)
{
clicon_debug(1, "%s", __FUNCTION__);
return 0;
}
clixon_plugin_api * clixon_plugin_init(clicon_handle h);
static clixon_plugin_api api = {
"example", /* name */
clixon_plugin_init, /* init */
example_restconf_start,/* start */
NULL, /* exit */
.ca_auth=example_restconf_credentials /* auth */
};
/*! Restconf plugin initialization
* @param[in] h Clixon handle
* @retval NULL Error with clicon_err set
* @retval api Pointer to API struct
* Arguments are argc/argv after --
*/
clixon_plugin_api *
clixon_plugin_init(clicon_handle h)
{
int argc; /* command-line options (after --) */
char **argv = NULL;
int c;
clicon_debug(1, "%s restconf", __FUNCTION__);
/* Get user command-line options (after --) */
if (clicon_argv_get(h, &argc, &argv) < 0)
return NULL;
opterr = 0;
optind = 1;
while ((c = getopt(argc, argv, RESTCONF_EXAMPLE_OPTS)) != -1)
switch (c) {
default:
break;
}
/* Register local netconf rpc client (note not backend rpc client) */
if (rpc_callback_register(h, restconf_client_rpc, NULL, "urn:example:clixon", "client-rpc") < 0)
return NULL;
return &api;
}
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