Home | History | Annotate | Download | only in eap_server 
      1 /*
      2  * EAP server method registration
      3  * Copyright (c) 2004-2009, Jouni Malinen <j (at) w1.fi>
      4  *
      5  * This software may be distributed under the terms of the BSD license.
      6  * See README for more details.
      7  */
      8 
      9 #include "includes.h"
     10 
     11 #include "common.h"
     12 #include "eap_i.h"
     13 #include "eap_methods.h"
     14 
     15 
     16 static struct eap_method *eap_methods;
     17 
     18 
     19 /**
     20  * eap_server_get_eap_method - Get EAP method based on type number
     21  * @vendor: EAP Vendor-Id (0 = IETF)
     22  * @method: EAP type number
     23  * Returns: Pointer to EAP method or %NULL if not found
     24  */
     25 const struct eap_method * eap_server_get_eap_method(int vendor, EapType method)
     26 {
     27 	struct eap_method *m;
     28 	for (m = eap_methods; m; m = m->next) {
     29 		if (m->vendor == vendor && m->method == method)
     30 			return m;
     31 	}
     32 	return NULL;
     33 }
     34 
     35 
     36 /**
     37  * eap_server_get_type - Get EAP type for the given EAP method name
     38  * @name: EAP method name, e.g., TLS
     39  * @vendor: Buffer for returning EAP Vendor-Id
     40  * Returns: EAP method type or %EAP_TYPE_NONE if not found
     41  *
     42  * This function maps EAP type names into EAP type numbers based on the list of
     43  * EAP methods included in the build.
     44  */
     45 EapType eap_server_get_type(const char *name, int *vendor)
     46 {
     47 	struct eap_method *m;
     48 	for (m = eap_methods; m; m = m->next) {
     49 		if (os_strcmp(m->name, name) == 0) {
     50 			*vendor = m->vendor;
     51 			return m->method;
     52 		}
     53 	}
     54 	*vendor = EAP_VENDOR_IETF;
     55 	return EAP_TYPE_NONE;
     56 }
     57 
     58 
     59 /**
     60  * eap_server_method_alloc - Allocate EAP server method structure
     61  * @version: Version of the EAP server method interface (set to
     62  * EAP_SERVER_METHOD_INTERFACE_VERSION)
     63  * @vendor: EAP Vendor-ID (EAP_VENDOR_*) (0 = IETF)
     64  * @method: EAP type number (EAP_TYPE_*)
     65  * @name: Name of the method (e.g., "TLS")
     66  * Returns: Allocated EAP method structure or %NULL on failure
     67  *
     68  * The returned structure should be freed with eap_server_method_free() when it
     69  * is not needed anymore.
     70  */
     71 struct eap_method * eap_server_method_alloc(int version, int vendor,
     72 					    EapType method, const char *name)
     73 {
     74 	struct eap_method *eap;
     75 	eap = os_zalloc(sizeof(*eap));
     76 	if (eap == NULL)
     77 		return NULL;
     78 	eap->version = version;
     79 	eap->vendor = vendor;
     80 	eap->method = method;
     81 	eap->name = name;
     82 	return eap;
     83 }
     84 
     85 
     86 /**
     87  * eap_server_method_free - Free EAP server method structure
     88  * @method: Method structure allocated with eap_server_method_alloc()
     89  */
     90 void eap_server_method_free(struct eap_method *method)
     91 {
     92 	os_free(method);
     93 }
     94 
     95 
     96 /**
     97  * eap_server_method_register - Register an EAP server method
     98  * @method: EAP method to register
     99  * Returns: 0 on success, -1 on invalid method, or -2 if a matching EAP method
    100  * has already been registered
    101  *
    102  * Each EAP server method needs to call this function to register itself as a
    103  * supported EAP method.
    104  */
    105 int eap_server_method_register(struct eap_method *method)
    106 {
    107 	struct eap_method *m, *last = NULL;
    108 
    109 	if (method == NULL || method->name == NULL ||
    110 	    method->version != EAP_SERVER_METHOD_INTERFACE_VERSION)
    111 		return -1;
    112 
    113 	for (m = eap_methods; m; m = m->next) {
    114 		if ((m->vendor == method->vendor &&
    115 		     m->method == method->method) ||
    116 		    os_strcmp(m->name, method->name) == 0)
    117 			return -2;
    118 		last = m;
    119 	}
    120 
    121 	if (last)
    122 		last->next = method;
    123 	else
    124 		eap_methods = method;
    125 
    126 	return 0;
    127 }
    128 
    129 
    130 /**
    131  * eap_server_unregister_methods - Unregister EAP server methods
    132  *
    133  * This function is called at program termination to unregister all EAP server
    134  * methods.
    135  */
    136 void eap_server_unregister_methods(void)
    137 {
    138 	struct eap_method *m;
    139 
    140 	while (eap_methods) {
    141 		m = eap_methods;
    142 		eap_methods = eap_methods->next;
    143 
    144 		if (m->free)
    145 			m->free(m);
    146 		else
    147 			eap_server_method_free(m);
    148 	}
    149 }
    150 
    151 
    152 /**
    153  * eap_server_get_name - Get EAP method name for the given EAP type
    154  * @vendor: EAP Vendor-Id (0 = IETF)
    155  * @type: EAP method type
    156  * Returns: EAP method name, e.g., TLS, or %NULL if not found
    157  *
    158  * This function maps EAP type numbers into EAP type names based on the list of
    159  * EAP methods included in the build.
    160  */
    161 const char * eap_server_get_name(int vendor, EapType type)
    162 {
    163 	struct eap_method *m;
    164 	if (vendor == EAP_VENDOR_IETF && type == EAP_TYPE_EXPANDED)
    165 		return "expanded";
    166 	for (m = eap_methods; m; m = m->next) {
    167 		if (m->vendor == vendor && m->method == type)
    168 			return m->name;
    169 	}
    170 	return NULL;
    171 }
    172