/*- * 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 #ifndef _PATH_GSS_MECH #define _PATH_GSS_MECH "/etc/gss/mech" #endif struct _gss_mech_switch_list _gss_mechs = { NULL, 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 *oidp) { int number_count, i, j; size_t byte_count; const char *p, *q; char *res; gss_OID_desc oid; *oidp = GSS_C_NO_OID; /* * 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 (byte_count == 0) return EINVAL; if (!res) { res = malloc(byte_count); if (!res) return (ENOMEM); oid.length = byte_count; oid.elements = res; } } { OM_uint32 minor_status, tmp; if (GSS_ERROR(_gss_intern_oid(&minor_status, &oid, oidp))) { _gss_free_oid(&tmp, &oid); return (minor_status); } _gss_free_oid(&tmp, &oid); } return (0); } #define SYM(name) \ do { \ m->gm_mech.gm_ ## name = (_gss_##name##_t *)dlsym(so, "gss_" #name); \ if (!m->gm_mech.gm_ ## name || \ m->gm_mech.gm_ ##name == gss_ ## name) { \ _gss_mg_log(1, "can't find symbol gss_" #name "\n"); \ goto bad; \ } \ } while (0) #define OPTSYM(name) \ do { \ m->gm_mech.gm_ ## name = (_gss_##name##_t *)dlsym(so, "gss_" #name); \ if (m->gm_mech.gm_ ## name == gss_ ## name) \ m->gm_mech.gm_ ## name = NULL; \ } while (0) /* mech exports gssspi_XXX, internally referred to as gss_XXX */ #define OPTSPISYM(name) \ do { \ m->gm_mech.gm_ ## name = (_gss_##name##_t *)dlsym(so, "gssspi_" #name); \ } while (0) /* mech exports gssspi_XXX, internally referred to as gssspi_XXX */ #define OPTSPISPISYM(name) \ do { \ m->gm_mech.gm_ ## name = (_gss_##name##_t *)dlsym(so, "gssspi_" #name); \ if (m->gm_mech.gm_ ## name == gssspi_ ## name) \ m->gm_mech.gm_ ## name = NULL; \ } while (0) #define COMPATSYM(name) \ do { \ m->gm_mech.gm_compat->gmc_ ## name = (_gss_##name##_t *)dlsym(so, "gss_" #name); \ if (m->gm_mech.gm_compat->gmc_ ## name == gss_ ## name) \ m->gm_mech.gm_compat->gmc_ ## name = NULL; \ } while (0) #define COMPATSPISYM(name) \ do { \ m->gm_mech.gm_compat->gmc_ ## name = (_gss_##name##_t *)dlsym(so, "gssspi_" #name); \ if (m->gm_mech.gm_compat->gmc_ ## name == gss_ ## name) \ m->gm_mech.gm_compat->gmc_ ## name = NULL; \ } 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 = calloc(1, sizeof(*m)); if (m == NULL) return ENOMEM; m->gm_so = NULL; m->gm_mech = *mech; _gss_intern_oid(&minor_status, &mech->gm_mech_oid, &m->gm_mech_oid); if (minor_status) { free(m); return minor_status; } if (gss_add_oid_set_member(&minor_status, &m->gm_mech.gm_mech_oid, &_gss_mech_oids) != GSS_S_COMPLETE) { free(m); return ENOMEM; } /* pick up the oid sets of names */ if (m->gm_mech.gm_inquire_names_for_mech) (*m->gm_mech.gm_inquire_names_for_mech)(&minor_status, &m->gm_mech.gm_mech_oid, &m->gm_name_types); if (m->gm_name_types == NULL && gss_create_empty_oid_set(&minor_status, &m->gm_name_types) != GSS_S_COMPLETE) { free(m); return ENOMEM; } HEIM_TAILQ_INSERT_TAIL(&_gss_mechs, m, gm_link); return 0; } static void init_mech_switch_list(void *p) { struct _gss_mech_switch_list *mechs = p; HEIM_TAILQ_INIT(mechs); } /* * Load the mechanisms file (/etc/gss/mech). */ void _gss_load_mech(void) { OM_uint32 major_status, minor_status; static heim_base_once_t once = HEIM_BASE_ONCE_INIT; #ifdef HAVE_DLOPEN FILE *fp; char buf[256]; char *p; char *name, *oid, *lib, *kobj; struct _gss_mech_switch *m; void *so; gss_OID mech_oid; int found; const char *conf = secure_getenv("GSS_MECH_CONFIG"); #endif heim_base_once_f(&once, &_gss_mechs, init_mech_switch_list); HEIMDAL_MUTEX_lock(&_gss_mech_mutex); if (!HEIM_TAILQ_EMPTY(&_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; } if (add_builtin(__gss_krb5_initialize())) _gss_mg_log(1, "Out of memory while adding builtin Kerberos GSS " "mechanism to the GSS mechanism switch"); if (add_builtin(__gss_spnego_initialize())) _gss_mg_log(1, "Out of memory while adding builtin SPNEGO " "mechanism to the GSS mechanism switch"); if (add_builtin(__gss_ntlm_initialize())) _gss_mg_log(1, "Out of memory while adding builtin NTLM " "mechanism to the GSS mechanism switch"); #ifdef HAVE_DLOPEN fp = fopen(conf ? conf : _PATH_GSS_MECH, "r"); if (!fp) goto out; rk_cloexec_file(fp); while (fgets(buf, sizeof(buf), fp)) { _gss_mo_init *mi; 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; if (_gss_string_to_oid(oid, &mech_oid)) continue; /* * Check for duplicates, already loaded mechs. */ found = 0; HEIM_TAILQ_FOREACH(m, &_gss_mechs, gm_link) { if (gss_oid_equal(&m->gm_mech.gm_mech_oid, mech_oid)) { found = 1; break; } } if (found) continue; so = dlopen(lib, RTLD_LAZY | RTLD_LOCAL | RTLD_GROUP); if (so == NULL) { _gss_mg_log(1, "dlopen: %s\n", dlerror()); goto bad; } m = calloc(1, sizeof(*m)); if (m == NULL) goto bad; m->gm_so = so; m->gm_mech_oid = mech_oid; m->gm_mech.gm_name = strdup(name); m->gm_mech.gm_mech_oid = *mech_oid; m->gm_mech.gm_flags = 0; m->gm_mech.gm_compat = calloc(1, sizeof(struct gss_mech_compat_desc_struct)); if (m->gm_mech.gm_compat == NULL) goto bad; major_status = gss_add_oid_set_member(&minor_status, &m->gm_mech.gm_mech_oid, &_gss_mech_oids); if (GSS_ERROR(major_status)) goto bad; 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); OPTSYM(display_status); OPTSYM(indicate_mechs); SYM(compare_name); SYM(display_name); SYM(import_name); SYM(export_name); SYM(release_name); OPTSYM(inquire_cred); SYM(inquire_context); SYM(wrap_size_limit); OPTSYM(add_cred); OPTSYM(inquire_cred_by_mech); SYM(export_sec_context); SYM(import_sec_context); OPTSYM(inquire_names_for_mech); OPTSYM(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); OPTSPISYM(set_cred_option); OPTSYM(pseudo_random); OPTSYM(wrap_iov); OPTSYM(unwrap_iov); OPTSYM(wrap_iov_length); OPTSYM(store_cred); OPTSYM(export_cred); OPTSYM(import_cred); OPTSYM(acquire_cred_from); OPTSYM(acquire_cred_impersonate_name); #if 0 OPTSYM(iter_creds); OPTSYM(destroy_cred); OPTSYM(cred_hold); OPTSYM(cred_unhold); OPTSYM(cred_label_get); OPTSYM(cred_label_set); #endif OPTSYM(display_name_ext); OPTSYM(inquire_name); OPTSYM(get_name_attribute); OPTSYM(set_name_attribute); OPTSYM(delete_name_attribute); OPTSYM(export_name_composite); OPTSYM(localname); OPTSYM(duplicate_cred); OPTSYM(add_cred_from); OPTSYM(store_cred_into); OPTSPISYM(authorize_localname); OPTSPISPISYM(query_mechanism_info); OPTSPISPISYM(query_meta_data); OPTSPISPISYM(exchange_meta_data); mi = (_gss_mo_init *)dlsym(so, "gss_mo_init"); if (mi != NULL) { major_status = mi(&minor_status, mech_oid, &m->gm_mech.gm_mo, &m->gm_mech.gm_mo_num); if (GSS_ERROR(major_status)) goto bad; } else { /* API-as-SPI compatibility */ COMPATSYM(inquire_saslname_for_mech); COMPATSYM(inquire_mech_for_saslname); COMPATSYM(inquire_attrs_for_mech); COMPATSPISYM(acquire_cred_with_password); } /* pick up the oid sets of names */ if (m->gm_mech.gm_inquire_names_for_mech) (*m->gm_mech.gm_inquire_names_for_mech)(&minor_status, &m->gm_mech.gm_mech_oid, &m->gm_name_types); if (m->gm_name_types == NULL) gss_create_empty_oid_set(&minor_status, &m->gm_name_types); HEIM_TAILQ_INSERT_TAIL(&_gss_mechs, m, gm_link); continue; bad: if (m != NULL) { free(m->gm_mech.gm_compat); /* do not free OID, it has been interned */ free((char *)m->gm_mech.gm_name); free(m); } if (so != NULL) dlclose(so); continue; } fclose(fp); out: #endif if (add_builtin(__gss_sanon_initialize())) _gss_mg_log(1, "Out of memory while adding builtin SANON " "mechanism to the GSS mechanism switch"); HEIMDAL_MUTEX_unlock(&_gss_mech_mutex); } gssapi_mech_interface __gss_get_mechanism(gss_const_OID mech) { struct _gss_mech_switch *m; _gss_load_mech(); HEIM_TAILQ_FOREACH(m, &_gss_mechs, gm_link) { if (gss_oid_equal(&m->gm_mech.gm_mech_oid, mech)) return &m->gm_mech; } return NULL; } gss_OID _gss_mg_support_mechanism(gss_const_OID mech) { struct _gss_mech_switch *m; _gss_load_mech(); HEIM_TAILQ_FOREACH(m, &_gss_mechs, gm_link) { if (gss_oid_equal(&m->gm_mech.gm_mech_oid, mech)) return m->gm_mech_oid; } return NULL; } enum mech_name_match { MATCH_NONE = 0, MATCH_COMPLETE, MATCH_PARTIAL }; static enum mech_name_match match_mech_name(const char *gm_mech_name, const char *name, size_t namelen) { if (gm_mech_name == NULL) return MATCH_NONE; else if (strcasecmp(gm_mech_name, name) == 0) return MATCH_COMPLETE; else if (strncasecmp(gm_mech_name, name, namelen) == 0) return MATCH_PARTIAL; else return MATCH_NONE; } /* * Return an OID for a built-in or dynamically loaded mechanism. For * API compatibility with previous versions, we treat "Kerberos 5" * as an alias for "krb5". Unique partial matches are supported. */ GSSAPI_LIB_FUNCTION gss_OID GSSAPI_CALLCONV gss_name_to_oid(const char *name) { struct _gss_mech_switch *m, *partial = NULL; gss_OID oid = GSS_C_NO_OID; size_t namelen = strlen(name); if (isdigit((unsigned char)name[0]) && _gss_string_to_oid(name, &oid) == 0) return oid; _gss_load_mech(); HEIM_TAILQ_FOREACH(m, &_gss_mechs, gm_link) { enum mech_name_match match; match = match_mech_name(m->gm_mech.gm_name, name, namelen); if (match == MATCH_NONE && gss_oid_equal(m->gm_mech_oid, GSS_KRB5_MECHANISM)) match = match_mech_name("Kerberos 5", name, namelen); if (match == MATCH_COMPLETE) return m->gm_mech_oid; else if (match == MATCH_PARTIAL) { if (partial) return NULL; else partial = m; } } if (partial) return partial->gm_mech_oid; return NULL; } GSSAPI_LIB_FUNCTION const char * GSSAPI_LIB_CALL gss_oid_to_name(gss_const_OID oid) { struct _gss_mech_switch *m; _gss_load_mech(); HEIM_TAILQ_FOREACH(m, &_gss_mechs, gm_link) { if (gss_oid_equal(m->gm_mech_oid, oid)) return m->gm_mech.gm_name; } return NULL; }