gss_mech_switch.c 7.6 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. kfree(pf->auth_domain_name);
  59. pf->auth_domain_name = NULL;
  60. }
  61. }
  62. static inline char *
  63. make_auth_domain_name(char *name)
  64. {
  65. static char *prefix = "gss/";
  66. char *new;
  67. new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL);
  68. if (new) {
  69. strcpy(new, prefix);
  70. strcat(new, name);
  71. }
  72. return new;
  73. }
  74. static int
  75. gss_mech_svc_setup(struct gss_api_mech *gm)
  76. {
  77. struct pf_desc *pf;
  78. int i, status;
  79. for (i = 0; i < gm->gm_pf_num; i++) {
  80. pf = &gm->gm_pfs[i];
  81. pf->auth_domain_name = make_auth_domain_name(pf->name);
  82. status = -ENOMEM;
  83. if (pf->auth_domain_name == NULL)
  84. goto out;
  85. status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor,
  86. pf->auth_domain_name);
  87. if (status)
  88. goto out;
  89. }
  90. return 0;
  91. out:
  92. gss_mech_free(gm);
  93. return status;
  94. }
  95. int
  96. gss_mech_register(struct gss_api_mech *gm)
  97. {
  98. int status;
  99. status = gss_mech_svc_setup(gm);
  100. if (status)
  101. return status;
  102. spin_lock(&registered_mechs_lock);
  103. list_add(&gm->gm_list, &registered_mechs);
  104. spin_unlock(&registered_mechs_lock);
  105. dprintk("RPC: registered gss mechanism %s\n", gm->gm_name);
  106. return 0;
  107. }
  108. EXPORT_SYMBOL(gss_mech_register);
  109. void
  110. gss_mech_unregister(struct gss_api_mech *gm)
  111. {
  112. spin_lock(&registered_mechs_lock);
  113. list_del(&gm->gm_list);
  114. spin_unlock(&registered_mechs_lock);
  115. dprintk("RPC: unregistered gss mechanism %s\n", gm->gm_name);
  116. gss_mech_free(gm);
  117. }
  118. EXPORT_SYMBOL(gss_mech_unregister);
  119. struct gss_api_mech *
  120. gss_mech_get(struct gss_api_mech *gm)
  121. {
  122. __module_get(gm->gm_owner);
  123. return gm;
  124. }
  125. EXPORT_SYMBOL(gss_mech_get);
  126. struct gss_api_mech *
  127. gss_mech_get_by_name(const char *name)
  128. {
  129. struct gss_api_mech *pos, *gm = NULL;
  130. spin_lock(&registered_mechs_lock);
  131. list_for_each_entry(pos, &registered_mechs, gm_list) {
  132. if (0 == strcmp(name, pos->gm_name)) {
  133. if (try_module_get(pos->gm_owner))
  134. gm = pos;
  135. break;
  136. }
  137. }
  138. spin_unlock(&registered_mechs_lock);
  139. return gm;
  140. }
  141. EXPORT_SYMBOL(gss_mech_get_by_name);
  142. static inline int
  143. mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor)
  144. {
  145. int i;
  146. for (i = 0; i < gm->gm_pf_num; i++) {
  147. if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
  148. return 1;
  149. }
  150. return 0;
  151. }
  152. struct gss_api_mech *
  153. gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
  154. {
  155. struct gss_api_mech *pos, *gm = NULL;
  156. spin_lock(&registered_mechs_lock);
  157. list_for_each_entry(pos, &registered_mechs, gm_list) {
  158. if (!mech_supports_pseudoflavor(pos, pseudoflavor)) {
  159. module_put(pos->gm_owner);
  160. continue;
  161. }
  162. if (try_module_get(pos->gm_owner))
  163. gm = pos;
  164. break;
  165. }
  166. spin_unlock(&registered_mechs_lock);
  167. return gm;
  168. }
  169. EXPORT_SYMBOL(gss_mech_get_by_pseudoflavor);
  170. u32
  171. gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
  172. {
  173. int i;
  174. for (i = 0; i < gm->gm_pf_num; i++) {
  175. if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
  176. return gm->gm_pfs[i].service;
  177. }
  178. return 0;
  179. }
  180. EXPORT_SYMBOL(gss_pseudoflavor_to_service);
  181. char *
  182. gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
  183. {
  184. int i;
  185. for (i = 0; i < gm->gm_pf_num; i++) {
  186. if (gm->gm_pfs[i].service == service)
  187. return gm->gm_pfs[i].auth_domain_name;
  188. }
  189. return NULL;
  190. }
  191. EXPORT_SYMBOL(gss_service_to_auth_domain_name);
  192. void
  193. gss_mech_put(struct gss_api_mech * gm)
  194. {
  195. if (gm)
  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 = kzalloc(sizeof(**ctx_id), GFP_KERNEL)))
  207. return GSS_S_FAILURE;
  208. (*ctx_id)->mech_type = gss_mech_get(mech);
  209. return mech->gm_ops
  210. ->gss_import_sec_context(input_token, bufsize, *ctx_id);
  211. }
  212. /* gss_get_mic: compute a mic over message and return mic_token. */
  213. u32
  214. gss_get_mic(struct gss_ctx *context_handle,
  215. struct xdr_buf *message,
  216. struct xdr_netobj *mic_token)
  217. {
  218. return context_handle->mech_type->gm_ops
  219. ->gss_get_mic(context_handle,
  220. message,
  221. mic_token);
  222. }
  223. /* gss_verify_mic: check whether the provided mic_token verifies message. */
  224. u32
  225. gss_verify_mic(struct gss_ctx *context_handle,
  226. struct xdr_buf *message,
  227. struct xdr_netobj *mic_token)
  228. {
  229. return context_handle->mech_type->gm_ops
  230. ->gss_verify_mic(context_handle,
  231. message,
  232. mic_token);
  233. }
  234. u32
  235. gss_wrap(struct gss_ctx *ctx_id,
  236. int offset,
  237. struct xdr_buf *buf,
  238. struct page **inpages)
  239. {
  240. return ctx_id->mech_type->gm_ops
  241. ->gss_wrap(ctx_id, offset, buf, inpages);
  242. }
  243. u32
  244. gss_unwrap(struct gss_ctx *ctx_id,
  245. int offset,
  246. struct xdr_buf *buf)
  247. {
  248. return ctx_id->mech_type->gm_ops
  249. ->gss_unwrap(ctx_id, offset, buf);
  250. }
  251. /* gss_delete_sec_context: free all resources associated with context_handle.
  252. * Note this differs from the RFC 2744-specified prototype in that we don't
  253. * bother returning an output token, since it would never be used anyway. */
  254. u32
  255. gss_delete_sec_context(struct gss_ctx **context_handle)
  256. {
  257. dprintk("RPC: gss_delete_sec_context deleting %p\n",
  258. *context_handle);
  259. if (!*context_handle)
  260. return(GSS_S_NO_CONTEXT);
  261. if ((*context_handle)->internal_ctx_id != 0)
  262. (*context_handle)->mech_type->gm_ops
  263. ->gss_delete_sec_context((*context_handle)
  264. ->internal_ctx_id);
  265. gss_mech_put((*context_handle)->mech_type);
  266. kfree(*context_handle);
  267. *context_handle=NULL;
  268. return GSS_S_COMPLETE;
  269. }