gss_mech_switch.c 7.4 KB

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  1. /*
  2. * linux/net/sunrpc/gss_mech_switch.c
  3. *
  4. * Copyright (c) 2001 The Regents of the University of Michigan.
  5. * All rights reserved.
  6. *
  7. * J. Bruce Fields <bfields@umich.edu>
  8. *
  9. * Redistribution and use in source and binary forms, with or without
  10. * modification, are permitted provided that the following conditions
  11. * are met:
  12. *
  13. * 1. Redistributions of source code must retain the above copyright
  14. * notice, this list of conditions and the following disclaimer.
  15. * 2. Redistributions in binary form must reproduce the above copyright
  16. * notice, this list of conditions and the following disclaimer in the
  17. * documentation and/or other materials provided with the distribution.
  18. * 3. Neither the name of the University nor the names of its
  19. * contributors may be used to endorse or promote products derived
  20. * from this software without specific prior written permission.
  21. *
  22. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  23. * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  24. * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  25. * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27. * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28. * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  29. * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  30. * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  31. * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  32. * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33. *
  34. */
  35. #include <linux/types.h>
  36. #include <linux/slab.h>
  37. #include <linux/module.h>
  38. #include <linux/sunrpc/msg_prot.h>
  39. #include <linux/sunrpc/gss_asn1.h>
  40. #include <linux/sunrpc/auth_gss.h>
  41. #include <linux/sunrpc/svcauth_gss.h>
  42. #include <linux/sunrpc/gss_err.h>
  43. #include <linux/sunrpc/sched.h>
  44. #include <linux/sunrpc/gss_api.h>
  45. #include <linux/sunrpc/clnt.h>
  46. #ifdef RPC_DEBUG
  47. # define RPCDBG_FACILITY RPCDBG_AUTH
  48. #endif
  49. static LIST_HEAD(registered_mechs);
  50. static DEFINE_SPINLOCK(registered_mechs_lock);
  51. static void
  52. gss_mech_free(struct gss_api_mech *gm)
  53. {
  54. struct pf_desc *pf;
  55. int i;
  56. for (i = 0; i < gm->gm_pf_num; i++) {
  57. pf = &gm->gm_pfs[i];
  58. if (pf->auth_domain_name)
  59. kfree(pf->auth_domain_name);
  60. pf->auth_domain_name = NULL;
  61. }
  62. }
  63. static inline char *
  64. make_auth_domain_name(char *name)
  65. {
  66. static char *prefix = "gss/";
  67. char *new;
  68. new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL);
  69. if (new) {
  70. strcpy(new, prefix);
  71. strcat(new, name);
  72. }
  73. return new;
  74. }
  75. static int
  76. gss_mech_svc_setup(struct gss_api_mech *gm)
  77. {
  78. struct pf_desc *pf;
  79. int i, status;
  80. for (i = 0; i < gm->gm_pf_num; i++) {
  81. pf = &gm->gm_pfs[i];
  82. pf->auth_domain_name = make_auth_domain_name(pf->name);
  83. status = -ENOMEM;
  84. if (pf->auth_domain_name == NULL)
  85. goto out;
  86. status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor,
  87. pf->auth_domain_name);
  88. if (status)
  89. goto out;
  90. }
  91. return 0;
  92. out:
  93. gss_mech_free(gm);
  94. return status;
  95. }
  96. int
  97. gss_mech_register(struct gss_api_mech *gm)
  98. {
  99. int status;
  100. status = gss_mech_svc_setup(gm);
  101. if (status)
  102. return status;
  103. spin_lock(&registered_mechs_lock);
  104. list_add(&gm->gm_list, &registered_mechs);
  105. spin_unlock(&registered_mechs_lock);
  106. dprintk("RPC: registered gss mechanism %s\n", gm->gm_name);
  107. return 0;
  108. }
  109. EXPORT_SYMBOL(gss_mech_register);
  110. void
  111. gss_mech_unregister(struct gss_api_mech *gm)
  112. {
  113. spin_lock(&registered_mechs_lock);
  114. list_del(&gm->gm_list);
  115. spin_unlock(&registered_mechs_lock);
  116. dprintk("RPC: unregistered gss mechanism %s\n", gm->gm_name);
  117. gss_mech_free(gm);
  118. }
  119. EXPORT_SYMBOL(gss_mech_unregister);
  120. struct gss_api_mech *
  121. gss_mech_get(struct gss_api_mech *gm)
  122. {
  123. __module_get(gm->gm_owner);
  124. return gm;
  125. }
  126. EXPORT_SYMBOL(gss_mech_get);
  127. struct gss_api_mech *
  128. gss_mech_get_by_name(const char *name)
  129. {
  130. struct gss_api_mech *pos, *gm = NULL;
  131. spin_lock(&registered_mechs_lock);
  132. list_for_each_entry(pos, &registered_mechs, gm_list) {
  133. if (0 == strcmp(name, pos->gm_name)) {
  134. if (try_module_get(pos->gm_owner))
  135. gm = pos;
  136. break;
  137. }
  138. }
  139. spin_unlock(&registered_mechs_lock);
  140. return gm;
  141. }
  142. EXPORT_SYMBOL(gss_mech_get_by_name);
  143. static inline int
  144. mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor)
  145. {
  146. int i;
  147. for (i = 0; i < gm->gm_pf_num; i++) {
  148. if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
  149. return 1;
  150. }
  151. return 0;
  152. }
  153. struct gss_api_mech *
  154. gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
  155. {
  156. struct gss_api_mech *pos, *gm = NULL;
  157. spin_lock(&registered_mechs_lock);
  158. list_for_each_entry(pos, &registered_mechs, gm_list) {
  159. if (!mech_supports_pseudoflavor(pos, pseudoflavor)) {
  160. module_put(pos->gm_owner);
  161. continue;
  162. }
  163. if (try_module_get(pos->gm_owner))
  164. gm = pos;
  165. break;
  166. }
  167. spin_unlock(&registered_mechs_lock);
  168. return gm;
  169. }
  170. EXPORT_SYMBOL(gss_mech_get_by_pseudoflavor);
  171. u32
  172. gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
  173. {
  174. int i;
  175. for (i = 0; i < gm->gm_pf_num; i++) {
  176. if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
  177. return gm->gm_pfs[i].service;
  178. }
  179. return 0;
  180. }
  181. EXPORT_SYMBOL(gss_pseudoflavor_to_service);
  182. char *
  183. gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
  184. {
  185. int i;
  186. for (i = 0; i < gm->gm_pf_num; i++) {
  187. if (gm->gm_pfs[i].service == service)
  188. return gm->gm_pfs[i].auth_domain_name;
  189. }
  190. return NULL;
  191. }
  192. EXPORT_SYMBOL(gss_service_to_auth_domain_name);
  193. void
  194. gss_mech_put(struct gss_api_mech * gm)
  195. {
  196. module_put(gm->gm_owner);
  197. }
  198. EXPORT_SYMBOL(gss_mech_put);
  199. /* The mech could probably be determined from the token instead, but it's just
  200. * as easy for now to pass it in. */
  201. int
  202. gss_import_sec_context(const void *input_token, size_t bufsize,
  203. struct gss_api_mech *mech,
  204. struct gss_ctx **ctx_id)
  205. {
  206. if (!(*ctx_id = kmalloc(sizeof(**ctx_id), GFP_KERNEL)))
  207. return GSS_S_FAILURE;
  208. memset(*ctx_id, 0, sizeof(**ctx_id));
  209. (*ctx_id)->mech_type = gss_mech_get(mech);
  210. return mech->gm_ops
  211. ->gss_import_sec_context(input_token, bufsize, *ctx_id);
  212. }
  213. /* gss_get_mic: compute a mic over message and return mic_token. */
  214. u32
  215. gss_get_mic(struct gss_ctx *context_handle,
  216. u32 qop,
  217. struct xdr_buf *message,
  218. struct xdr_netobj *mic_token)
  219. {
  220. return context_handle->mech_type->gm_ops
  221. ->gss_get_mic(context_handle,
  222. qop,
  223. message,
  224. mic_token);
  225. }
  226. /* gss_verify_mic: check whether the provided mic_token verifies message. */
  227. u32
  228. gss_verify_mic(struct gss_ctx *context_handle,
  229. struct xdr_buf *message,
  230. struct xdr_netobj *mic_token,
  231. u32 *qstate)
  232. {
  233. return context_handle->mech_type->gm_ops
  234. ->gss_verify_mic(context_handle,
  235. message,
  236. mic_token,
  237. qstate);
  238. }
  239. /* gss_delete_sec_context: free all resources associated with context_handle.
  240. * Note this differs from the RFC 2744-specified prototype in that we don't
  241. * bother returning an output token, since it would never be used anyway. */
  242. u32
  243. gss_delete_sec_context(struct gss_ctx **context_handle)
  244. {
  245. dprintk("RPC: gss_delete_sec_context deleting %p\n",
  246. *context_handle);
  247. if (!*context_handle)
  248. return(GSS_S_NO_CONTEXT);
  249. if ((*context_handle)->internal_ctx_id != 0)
  250. (*context_handle)->mech_type->gm_ops
  251. ->gss_delete_sec_context((*context_handle)
  252. ->internal_ctx_id);
  253. if ((*context_handle)->mech_type)
  254. gss_mech_put((*context_handle)->mech_type);
  255. kfree(*context_handle);
  256. *context_handle=NULL;
  257. return GSS_S_COMPLETE;
  258. }