1 | /* |
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2 | * Sun RPC is a product of Sun Microsystems, Inc. and is provided for |
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3 | * unrestricted use provided that this legend is included on all tape |
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4 | * media and as a part of the software program in whole or part. Users |
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5 | * may copy or modify Sun RPC without charge, but are not authorized |
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6 | * to license or distribute it to anyone else except as part of a product or |
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7 | * program developed by the user. |
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8 | * |
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9 | * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE |
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10 | * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR |
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11 | * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. |
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12 | * |
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13 | * Sun RPC is provided with no support and without any obligation on the |
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14 | * part of Sun Microsystems, Inc. to assist in its use, correction, |
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15 | * modification or enhancement. |
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16 | * |
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17 | * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE |
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18 | * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC |
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19 | * OR ANY PART THEREOF. |
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20 | * |
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21 | * In no event will Sun Microsystems, Inc. be liable for any lost revenue |
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22 | * or profits or other special, indirect and consequential damages, even if |
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23 | * Sun has been advised of the possibility of such damages. |
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24 | * |
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25 | * Sun Microsystems, Inc. |
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26 | * 2550 Garcia Avenue |
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27 | * Mountain View, California 94043 |
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28 | */ |
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29 | /* |
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30 | * Copyright (c) 1986-1991 by Sun Microsystems Inc. |
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31 | */ |
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32 | |
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33 | /* #ident "@(#)svc_auth.c 1.16 94/04/24 SMI" */ |
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34 | |
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35 | #if !defined(lint) && defined(SCCSIDS) |
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36 | #if 0 |
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37 | static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro"; |
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38 | #else |
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39 | static const char rcsid[] = |
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40 | "$FreeBSD: src/lib/libc/rpc/svc_auth.c,v 1.7 1999/12/29 05:04:16 peter Exp $"; |
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41 | #endif |
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42 | #endif |
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43 | |
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44 | /* |
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45 | * svc_auth.c, Server-side rpc authenticator interface. |
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46 | * |
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47 | */ |
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48 | |
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49 | #ifdef _KERNEL |
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50 | #include <sys/param.h> |
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51 | #include <rpc/types.h> |
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52 | #include <rpc/xdr.h> |
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53 | #include <rpc/auth.h> |
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54 | #include <rpc/clnt.h> |
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55 | #include <rpc/rpc_msg.h> |
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56 | #include <rpc/svc.h> |
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57 | #include <rpc/svc_auth.h> |
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58 | #else |
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59 | #include <stdlib.h> |
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60 | #include <rpc/rpc.h> |
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61 | #endif |
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62 | #include <sys/types.h> |
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63 | |
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64 | /* |
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65 | * svcauthsw is the bdevsw of server side authentication. |
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66 | * |
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67 | * Server side authenticators are called from authenticate by |
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68 | * using the client auth struct flavor field to index into svcauthsw. |
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69 | * The server auth flavors must implement a routine that looks |
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70 | * like: |
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71 | * |
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72 | * enum auth_stat |
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73 | * flavorx_auth(rqst, msg) |
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74 | * register struct svc_req *rqst; |
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75 | * register struct rpc_msg *msg; |
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76 | * |
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77 | */ |
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78 | |
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79 | enum auth_stat _svcauth_null(); /* no authentication */ |
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80 | enum auth_stat _svcauth_unix(); /* (system) unix style (uid, gids) */ |
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81 | enum auth_stat _svcauth_short(); /* short hand unix style */ |
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82 | enum auth_stat _svcauth_des(); /* des style */ |
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83 | |
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84 | /* declarations to allow servers to specify new authentication flavors */ |
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85 | struct authsvc { |
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86 | int flavor; |
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87 | enum auth_stat (*handler)(); |
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88 | struct authsvc *next; |
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89 | }; |
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90 | #define Auths ((struct authsvc *)((struct rtems_rpc_task_variables *)rtems_rpc_task_variables)->svc_auths_Auths) |
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91 | |
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92 | /* |
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93 | * The call rpc message, msg has been obtained from the wire. The msg contains |
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94 | * the raw form of credentials and verifiers. authenticate returns AUTH_OK |
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95 | * if the msg is successfully authenticated. If AUTH_OK then the routine also |
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96 | * does the following things: |
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97 | * set rqst->rq_xprt->verf to the appropriate response verifier; |
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98 | * sets rqst->rq_client_cred to the "cooked" form of the credentials. |
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99 | * |
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100 | * NB: rqst->rq_cxprt->verf must be pre-alloctaed; |
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101 | * its length is set appropriately. |
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102 | * |
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103 | * The caller still owns and is responsible for msg->u.cmb.cred and |
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104 | * msg->u.cmb.verf. The authentication system retains ownership of |
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105 | * rqst->rq_client_cred, the cooked credentials. |
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106 | * |
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107 | * There is an assumption that any flavour less than AUTH_NULL is |
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108 | * invalid. |
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109 | */ |
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110 | enum auth_stat |
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111 | _authenticate(rqst, msg) |
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112 | register struct svc_req *rqst; |
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113 | struct rpc_msg *msg; |
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114 | { |
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115 | register int cred_flavor; |
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116 | register struct authsvc *asp; |
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117 | |
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118 | rqst->rq_cred = msg->rm_call.cb_cred; |
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119 | rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor; |
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120 | rqst->rq_xprt->xp_verf.oa_length = 0; |
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121 | cred_flavor = rqst->rq_cred.oa_flavor; |
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122 | switch (cred_flavor) { |
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123 | case AUTH_NULL: |
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124 | return(_svcauth_null(rqst, msg)); |
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125 | case AUTH_UNIX: |
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126 | return(_svcauth_unix(rqst, msg)); |
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127 | case AUTH_SHORT: |
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128 | return(_svcauth_short(rqst, msg)); |
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129 | /* |
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130 | * We leave AUTH_DES turned off by default because svcauth_des() |
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131 | * needs getpublickey(), which is in librpcsvc, not libc. If we |
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132 | * included AUTH_DES as a built-in flavor, programs that don't |
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133 | * have -lrpcsvc in their Makefiles wouldn't link correctly, even |
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134 | * though they don't use AUTH_DES. And I'm too lazy to go through |
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135 | * the tree looking for all of them. |
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136 | */ |
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137 | #ifdef DES_BUILTIN |
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138 | case AUTH_DES: |
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139 | return(_svcauth_des(rqst, msg)); |
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140 | #endif |
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141 | } |
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142 | |
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143 | /* flavor doesn't match any of the builtin types, so try new ones */ |
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144 | for (asp = Auths; asp; asp = asp->next) { |
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145 | if (asp->flavor == cred_flavor) { |
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146 | enum auth_stat as; |
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147 | |
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148 | as = (*asp->handler)(rqst, msg); |
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149 | return (as); |
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150 | } |
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151 | } |
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152 | |
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153 | return (AUTH_REJECTEDCRED); |
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154 | } |
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155 | |
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156 | /*ARGSUSED*/ |
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157 | enum auth_stat |
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158 | _svcauth_null(rqst, msg) |
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159 | struct svc_req *rqst; |
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160 | struct rpc_msg *msg; |
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161 | { |
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162 | return (AUTH_OK); |
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163 | } |
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164 | |
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165 | /* |
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166 | * Allow the rpc service to register new authentication types that it is |
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167 | * prepared to handle. When an authentication flavor is registered, |
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168 | * the flavor is checked against already registered values. If not |
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169 | * registered, then a new Auths entry is added on the list. |
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170 | * |
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171 | * There is no provision to delete a registration once registered. |
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172 | * |
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173 | * This routine returns: |
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174 | * 0 if registration successful |
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175 | * 1 if flavor already registered |
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176 | * -1 if can't register (errno set) |
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177 | */ |
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178 | |
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179 | int |
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180 | svc_auth_reg(cred_flavor, handler) |
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181 | register int cred_flavor; |
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182 | enum auth_stat (*handler)(); |
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183 | { |
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184 | register struct authsvc *asp; |
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185 | |
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186 | switch (cred_flavor) { |
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187 | case AUTH_NULL: |
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188 | case AUTH_UNIX: |
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189 | case AUTH_SHORT: |
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190 | #ifdef DES_BUILTIN |
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191 | case AUTH_DES: |
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192 | #endif |
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193 | /* already registered */ |
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194 | return (1); |
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195 | |
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196 | default: |
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197 | for (asp = Auths; asp; asp = asp->next) { |
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198 | if (asp->flavor == cred_flavor) { |
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199 | /* already registered */ |
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200 | return (1); |
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201 | } |
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202 | } |
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203 | |
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204 | /* this is a new one, so go ahead and register it */ |
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205 | asp = (struct authsvc *)mem_alloc(sizeof (*asp)); |
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206 | if (asp == NULL) { |
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207 | return (-1); |
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208 | } |
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209 | asp->flavor = cred_flavor; |
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210 | asp->handler = handler; |
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211 | asp->next = Auths; |
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212 | Auths = asp; |
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213 | break; |
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214 | } |
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215 | return (0); |
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216 | } |
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