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      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 static 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 from eap_server_method_alloc()
     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. The caller must not free the allocated method data
    104  * regardless of the return value.
    105  */
    106 int eap_server_method_register(struct eap_method *method)
    107 {
    108 	struct eap_method *m, *last = NULL;
    109 
    110 	if (method == NULL || method->name == NULL ||
    111 	    method->version != EAP_SERVER_METHOD_INTERFACE_VERSION) {
    112 		eap_server_method_free(method);
    113 		return -1;
    114 	}
    115 
    116 	for (m = eap_methods; m; m = m->next) {
    117 		if ((m->vendor == method->vendor &&
    118 		     m->method == method->method) ||
    119 		    os_strcmp(m->name, method->name) == 0) {
    120 			eap_server_method_free(method);
    121 			return -2;
    122 		}
    123 		last = m;
    124 	}
    125 
    126 	if (last)
    127 		last->next = method;
    128 	else
    129 		eap_methods = method;
    130 
    131 	return 0;
    132 }
    133 
    134 
    135 /**
    136  * eap_server_unregister_methods - Unregister EAP server methods
    137  *
    138  * This function is called at program termination to unregister all EAP server
    139  * methods.
    140  */
    141 void eap_server_unregister_methods(void)
    142 {
    143 	struct eap_method *m;
    144 
    145 	while (eap_methods) {
    146 		m = eap_methods;
    147 		eap_methods = eap_methods->next;
    148 
    149 		if (m->free)
    150 			m->free(m);
    151 		else
    152 			eap_server_method_free(m);
    153 	}
    154 }
    155 
    156 
    157 /**
    158  * eap_server_get_name - Get EAP method name for the given EAP type
    159  * @vendor: EAP Vendor-Id (0 = IETF)
    160  * @type: EAP method type
    161  * Returns: EAP method name, e.g., TLS, or "unknown" if not found
    162  *
    163  * This function maps EAP type numbers into EAP type names based on the list of
    164  * EAP methods included in the build.
    165  */
    166 const char * eap_server_get_name(int vendor, EapType type)
    167 {
    168 	struct eap_method *m;
    169 	if (vendor == EAP_VENDOR_IETF && type == EAP_TYPE_EXPANDED)
    170 		return "expanded";
    171 	for (m = eap_methods; m; m = m->next) {
    172 		if (m->vendor == vendor && m->method == type)
    173 			return m->name;
    174 	}
    175 	return "unknown";
    176 }
    177