/* * linux/net/sunrpc/gss_mech_switch.c * * Copyright (c) 2001 The Regents of the University of Michigan. * All rights reserved. * * J. Bruce Fields <bfields@umich.edu> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include <linux/types.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/sunrpc/msg_prot.h> #include <linux/sunrpc/gss_asn1.h> #include <linux/sunrpc/auth_gss.h> #include <linux/sunrpc/svcauth_gss.h> #include <linux/sunrpc/gss_err.h> #include <linux/sunrpc/sched.h> #include <linux/sunrpc/gss_api.h> #include <linux/sunrpc/clnt.h> #ifdef RPC_DEBUG # define RPCDBG_FACILITY RPCDBG_AUTH #endif static LIST_HEAD(registered_mechs); static DEFINE_SPINLOCK(registered_mechs_lock); static void gss_mech_free(struct gss_api_mech *gm) { struct pf_desc *pf; int i; for (i = 0; i < gm->gm_pf_num; i++) { pf = &gm->gm_pfs[i]; kfree(pf->auth_domain_name); pf->auth_domain_name = NULL; } } static inline char * make_auth_domain_name(char *name) { static char *prefix = "gss/"; char *new; new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL); if (new) { strcpy(new, prefix); strcat(new, name); } return new; } static int gss_mech_svc_setup(struct gss_api_mech *gm) { struct pf_desc *pf; int i, status; for (i = 0; i < gm->gm_pf_num; i++) { pf = &gm->gm_pfs[i]; pf->auth_domain_name = make_auth_domain_name(pf->name); status = -ENOMEM; if (pf->auth_domain_name == NULL) goto out; status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor, pf->auth_domain_name); if (status) goto out; } return 0; out: gss_mech_free(gm); return status; } int gss_mech_register(struct gss_api_mech *gm) { int status; status = gss_mech_svc_setup(gm); if (status) return status; spin_lock(®istered_mechs_lock); list_add(&gm->gm_list, ®istered_mechs); spin_unlock(®istered_mechs_lock); dprintk("RPC: registered gss mechanism %s\n", gm->gm_name); return 0; } EXPORT_SYMBOL(gss_mech_register); void gss_mech_unregister(struct gss_api_mech *gm) { spin_lock(®istered_mechs_lock); list_del(&gm->gm_list); spin_unlock(®istered_mechs_lock); dprintk("RPC: unregistered gss mechanism %s\n", gm->gm_name); gss_mech_free(gm); } EXPORT_SYMBOL(gss_mech_unregister); struct gss_api_mech * gss_mech_get(struct gss_api_mech *gm) { __module_get(gm->gm_owner); return gm; } EXPORT_SYMBOL(gss_mech_get); struct gss_api_mech * gss_mech_get_by_name(const char *name) { struct gss_api_mech *pos, *gm = NULL; spin_lock(®istered_mechs_lock); list_for_each_entry(pos, ®istered_mechs, gm_list) { if (0 == strcmp(name, pos->gm_name)) { if (try_module_get(pos->gm_owner)) gm = pos; break; } } spin_unlock(®istered_mechs_lock); return gm; } EXPORT_SYMBOL(gss_mech_get_by_name); static inline int mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor) { int i; for (i = 0; i < gm->gm_pf_num; i++) { if (gm->gm_pfs[i].pseudoflavor == pseudoflavor) return 1; } return 0; } struct gss_api_mech * gss_mech_get_by_pseudoflavor(u32 pseudoflavor) { struct gss_api_mech *pos, *gm = NULL; spin_lock(®istered_mechs_lock); list_for_each_entry(pos, ®istered_mechs, gm_list) { if (!mech_supports_pseudoflavor(pos, pseudoflavor)) { module_put(pos->gm_owner); continue; } if (try_module_get(pos->gm_owner)) gm = pos; break; } spin_unlock(®istered_mechs_lock); return gm; } EXPORT_SYMBOL(gss_mech_get_by_pseudoflavor); u32 gss_svc_to_pseudoflavor(struct gss_api_mech *gm, u32 service) { int i; for (i = 0; i < gm->gm_pf_num; i++) { if (gm->gm_pfs[i].service == service) { return gm->gm_pfs[i].pseudoflavor; } } return RPC_AUTH_MAXFLAVOR; /* illegal value */ } EXPORT_SYMBOL(gss_svc_to_pseudoflavor); u32 gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor) { int i; for (i = 0; i < gm->gm_pf_num; i++) { if (gm->gm_pfs[i].pseudoflavor == pseudoflavor) return gm->gm_pfs[i].service; } return 0; } EXPORT_SYMBOL(gss_pseudoflavor_to_service); char * gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service) { int i; for (i = 0; i < gm->gm_pf_num; i++) { if (gm->gm_pfs[i].service == service) return gm->gm_pfs[i].auth_domain_name; } return NULL; } EXPORT_SYMBOL(gss_service_to_auth_domain_name); void gss_mech_put(struct gss_api_mech * gm) { if (gm) module_put(gm->gm_owner); } EXPORT_SYMBOL(gss_mech_put); /* The mech could probably be determined from the token instead, but it's just * as easy for now to pass it in. */ int gss_import_sec_context(const void *input_token, size_t bufsize, struct gss_api_mech *mech, struct gss_ctx **ctx_id) { if (!(*ctx_id = kzalloc(sizeof(**ctx_id), GFP_KERNEL))) return GSS_S_FAILURE; (*ctx_id)->mech_type = gss_mech_get(mech); return mech->gm_ops ->gss_import_sec_context(input_token, bufsize, *ctx_id); } /* gss_get_mic: compute a mic over message and return mic_token. */ u32 gss_get_mic(struct gss_ctx *context_handle, struct xdr_buf *message, struct xdr_netobj *mic_token) { return context_handle->mech_type->gm_ops ->gss_get_mic(context_handle, message, mic_token); } /* gss_verify_mic: check whether the provided mic_token verifies message. */ u32 gss_verify_mic(struct gss_ctx *context_handle, struct xdr_buf *message, struct xdr_netobj *mic_token) { return context_handle->mech_type->gm_ops ->gss_verify_mic(context_handle, message, mic_token); } u32 gss_wrap(struct gss_ctx *ctx_id, int offset, struct xdr_buf *buf, struct page **inpages) { return ctx_id->mech_type->gm_ops ->gss_wrap(ctx_id, offset, buf, inpages); } u32 gss_unwrap(struct gss_ctx *ctx_id, int offset, struct xdr_buf *buf) { return ctx_id->mech_type->gm_ops ->gss_unwrap(ctx_id, offset, buf); } /* gss_delete_sec_context: free all resources associated with context_handle. * Note this differs from the RFC 2744-specified prototype in that we don't * bother returning an output token, since it would never be used anyway. */ u32 gss_delete_sec_context(struct gss_ctx **context_handle) { dprintk("RPC: gss_delete_sec_context deleting %p\n", *context_handle); if (!*context_handle) return(GSS_S_NO_CONTEXT); if ((*context_handle)->internal_ctx_id != 0) (*context_handle)->mech_type->gm_ops ->gss_delete_sec_context((*context_handle) ->internal_ctx_id); gss_mech_put((*context_handle)->mech_type); kfree(*context_handle); *context_handle=NULL; return GSS_S_COMPLETE; }