diff options
Diffstat (limited to 'source4/heimdal/lib/gssapi/mech/gss_mech_switch.c')
| -rw-r--r-- | source4/heimdal/lib/gssapi/mech/gss_mech_switch.c | 335 |
1 files changed, 335 insertions, 0 deletions
diff --git a/source4/heimdal/lib/gssapi/mech/gss_mech_switch.c b/source4/heimdal/lib/gssapi/mech/gss_mech_switch.c new file mode 100644 index 0000000000..5b8d35c3dd --- /dev/null +++ b/source4/heimdal/lib/gssapi/mech/gss_mech_switch.c @@ -0,0 +1,335 @@ +/*- + * Copyright (c) 2005 Doug Rabson + * All rights reserved. + * + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR 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. + * + * $FreeBSD: src/lib/libgssapi/gss_mech_switch.c,v 1.2 2006/02/04 09:40:21 dfr Exp $ + */ + +#include "mech_locl.h" +#include <heim_threads.h> +RCSID("$Id$"); + +#ifndef _PATH_GSS_MECH +#define _PATH_GSS_MECH "/etc/gss/mech" +#endif + +struct _gss_mech_switch_list _gss_mechs = { NULL } ; +gss_OID_set _gss_mech_oids; +static HEIMDAL_MUTEX _gss_mech_mutex = HEIMDAL_MUTEX_INITIALIZER; + +/* + * Convert a string containing an OID in 'dot' form + * (e.g. 1.2.840.113554.1.2.2) to a gss_OID. + */ +static int +_gss_string_to_oid(const char* s, gss_OID oid) +{ + int number_count, i, j; + size_t byte_count; + const char *p, *q; + char *res; + + oid->length = 0; + oid->elements = NULL; + + /* + * First figure out how many numbers in the oid, then + * calculate the compiled oid size. + */ + number_count = 0; + for (p = s; p; p = q) { + q = strchr(p, '.'); + if (q) q = q + 1; + number_count++; + } + + /* + * The first two numbers are in the first byte and each + * subsequent number is encoded in a variable byte sequence. + */ + if (number_count < 2) + return (EINVAL); + + /* + * We do this in two passes. The first pass, we just figure + * out the size. Second time around, we actually encode the + * number. + */ + res = 0; + for (i = 0; i < 2; i++) { + byte_count = 0; + for (p = s, j = 0; p; p = q, j++) { + unsigned int number = 0; + + /* + * Find the end of this number. + */ + q = strchr(p, '.'); + if (q) q = q + 1; + + /* + * Read the number of of the string. Don't + * bother with anything except base ten. + */ + while (*p && *p != '.') { + number = 10 * number + (*p - '0'); + p++; + } + + /* + * Encode the number. The first two numbers + * are packed into the first byte. Subsequent + * numbers are encoded in bytes seven bits at + * a time with the last byte having the high + * bit set. + */ + if (j == 0) { + if (res) + *res = number * 40; + } else if (j == 1) { + if (res) { + *res += number; + res++; + } + byte_count++; + } else if (j >= 2) { + /* + * The number is encoded in seven bit chunks. + */ + unsigned int t; + unsigned int bytes; + + bytes = 0; + for (t = number; t; t >>= 7) + bytes++; + if (bytes == 0) bytes = 1; + while (bytes) { + if (res) { + int bit = 7*(bytes-1); + + *res = (number >> bit) & 0x7f; + if (bytes != 1) + *res |= 0x80; + res++; + } + byte_count++; + bytes--; + } + } + } + if (!res) { + res = malloc(byte_count); + if (!res) + return (ENOMEM); + oid->length = byte_count; + oid->elements = res; + } + } + + return (0); +} + +#define SYM(name) \ +do { \ + m->gm_mech.gm_ ## name = dlsym(so, "gss_" #name); \ + if (!m->gm_mech.gm_ ## name) { \ + fprintf(stderr, "can't find symbol gss_" #name "\n"); \ + goto bad; \ + } \ +} while (0) + +#define OPTSYM(name) \ +do { \ + m->gm_mech.gm_ ## name = dlsym(so, "gss_" #name); \ +} while (0) + +/* + * + */ +static int +add_builtin(gssapi_mech_interface mech) +{ + struct _gss_mech_switch *m; + OM_uint32 minor_status; + + /* not registering any mech is ok */ + if (mech == NULL) + return 0; + + m = malloc(sizeof(*m)); + if (m == NULL) + return 1; + m->gm_so = NULL; + m->gm_mech = *mech; + m->gm_mech_oid = mech->gm_mech_oid; /* XXX */ + gss_add_oid_set_member(&minor_status, + &m->gm_mech.gm_mech_oid, &_gss_mech_oids); + + SLIST_INSERT_HEAD(&_gss_mechs, m, gm_link); + return 0; +} + +/* + * Load the mechanisms file (/etc/gss/mech). + */ +void +_gss_load_mech(void) +{ + OM_uint32 major_status, minor_status; + FILE *fp; + char buf[256]; + char *p; + char *name, *oid, *lib, *kobj; + struct _gss_mech_switch *m; + void *so; + + + HEIMDAL_MUTEX_lock(&_gss_mech_mutex); + + if (SLIST_FIRST(&_gss_mechs)) { + HEIMDAL_MUTEX_unlock(&_gss_mech_mutex); + return; + } + + major_status = gss_create_empty_oid_set(&minor_status, + &_gss_mech_oids); + if (major_status) { + HEIMDAL_MUTEX_unlock(&_gss_mech_mutex); + return; + } + + add_builtin(__gss_krb5_initialize()); + add_builtin(__gss_spnego_initialize()); + add_builtin(__gss_ntlm_initialize()); + +#ifdef HAVE_DLOPEN + fp = fopen(_PATH_GSS_MECH, "r"); + if (!fp) { + HEIMDAL_MUTEX_unlock(&_gss_mech_mutex); + return; + } + rk_cloexec_file(fp); + + while (fgets(buf, sizeof(buf), fp)) { + if (*buf == '#') + continue; + p = buf; + name = strsep(&p, "\t\n "); + if (p) while (isspace((unsigned char)*p)) p++; + oid = strsep(&p, "\t\n "); + if (p) while (isspace((unsigned char)*p)) p++; + lib = strsep(&p, "\t\n "); + if (p) while (isspace((unsigned char)*p)) p++; + kobj = strsep(&p, "\t\n "); + if (!name || !oid || !lib || !kobj) + continue; + +#ifndef RTLD_LOCAL +#define RTLD_LOCAL 0 +#endif + + so = dlopen(lib, RTLD_LAZY | RTLD_LOCAL); + if (!so) { +/* fprintf(stderr, "dlopen: %s\n", dlerror()); */ + continue; + } + + m = malloc(sizeof(*m)); + if (!m) + break; + m->gm_so = so; + if (_gss_string_to_oid(oid, &m->gm_mech.gm_mech_oid)) { + free(m); + continue; + } + + major_status = gss_add_oid_set_member(&minor_status, + &m->gm_mech.gm_mech_oid, &_gss_mech_oids); + if (major_status) { + free(m->gm_mech.gm_mech_oid.elements); + free(m); + continue; + } + + SYM(acquire_cred); + SYM(release_cred); + SYM(init_sec_context); + SYM(accept_sec_context); + SYM(process_context_token); + SYM(delete_sec_context); + SYM(context_time); + SYM(get_mic); + SYM(verify_mic); + SYM(wrap); + SYM(unwrap); + SYM(display_status); + SYM(indicate_mechs); + SYM(compare_name); + SYM(display_name); + SYM(import_name); + SYM(export_name); + SYM(release_name); + SYM(inquire_cred); + SYM(inquire_context); + SYM(wrap_size_limit); + SYM(add_cred); + SYM(inquire_cred_by_mech); + SYM(export_sec_context); + SYM(import_sec_context); + SYM(inquire_names_for_mech); + SYM(inquire_mechs_for_name); + SYM(canonicalize_name); + SYM(duplicate_name); + OPTSYM(inquire_cred_by_oid); + OPTSYM(inquire_sec_context_by_oid); + OPTSYM(set_sec_context_option); + OPTSYM(set_cred_option); + OPTSYM(pseudo_random); + + SLIST_INSERT_HEAD(&_gss_mechs, m, gm_link); + continue; + + bad: + free(m->gm_mech.gm_mech_oid.elements); + free(m); + dlclose(so); + continue; + } + fclose(fp); +#endif + HEIMDAL_MUTEX_unlock(&_gss_mech_mutex); +} + +gssapi_mech_interface +__gss_get_mechanism(gss_OID mech) +{ + struct _gss_mech_switch *m; + + _gss_load_mech(); + SLIST_FOREACH(m, &_gss_mechs, gm_link) { + if (gss_oid_equal(&m->gm_mech.gm_mech_oid, mech)) + return &m->gm_mech; + } + return NULL; +} |