/* * Copyright 1999-2020 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ /* X509 v3 extension utilities */ #include #include "internal/cryptlib.h" #include #include #include "ext_dat.h" static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL; static int ext_cmp(const X509V3_EXT_METHOD *const *a, const X509V3_EXT_METHOD *const *b); static void ext_list_free(X509V3_EXT_METHOD *ext); int X509V3_EXT_add(X509V3_EXT_METHOD *ext) { if (ext_list == NULL && (ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp)) == NULL) { ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB); return 0; } if (!sk_X509V3_EXT_METHOD_push(ext_list, ext)) { ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB); return 0; } return 1; } static int ext_cmp(const X509V3_EXT_METHOD *const *a, const X509V3_EXT_METHOD *const *b) { return ((*a)->ext_nid - (*b)->ext_nid); } DECLARE_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *, const X509V3_EXT_METHOD *, ext); IMPLEMENT_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *, const X509V3_EXT_METHOD *, ext); #include "standard_exts.h" const X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid) { X509V3_EXT_METHOD tmp; const X509V3_EXT_METHOD *t = &tmp, *const *ret; int idx; if (nid < 0) return NULL; tmp.ext_nid = nid; ret = OBJ_bsearch_ext(&t, standard_exts, STANDARD_EXTENSION_COUNT); if (ret) return *ret; if (!ext_list) return NULL; idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp); return sk_X509V3_EXT_METHOD_value(ext_list, idx); } const X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext) { int nid; if ((nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext))) == NID_undef) return NULL; return X509V3_EXT_get_nid(nid); } int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist) { for (; extlist->ext_nid != -1; extlist++) if (!X509V3_EXT_add(extlist)) return 0; return 1; } int X509V3_EXT_add_alias(int nid_to, int nid_from) { const X509V3_EXT_METHOD *ext; X509V3_EXT_METHOD *tmpext; if ((ext = X509V3_EXT_get_nid(nid_from)) == NULL) { ERR_raise(ERR_LIB_X509V3, X509V3_R_EXTENSION_NOT_FOUND); return 0; } if ((tmpext = OPENSSL_malloc(sizeof(*tmpext))) == NULL) return 0; *tmpext = *ext; tmpext->ext_nid = nid_to; tmpext->ext_flags |= X509V3_EXT_DYNAMIC; return X509V3_EXT_add(tmpext); } void X509V3_EXT_cleanup(void) { sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free); ext_list = NULL; } static void ext_list_free(X509V3_EXT_METHOD *ext) { if (ext->ext_flags & X509V3_EXT_DYNAMIC) OPENSSL_free(ext); } /* * Legacy function: we don't need to add standard extensions any more because * they are now kept in ext_dat.h. */ int X509V3_add_standard_extensions(void) { return 1; } /* Return an extension internal structure */ void *X509V3_EXT_d2i(X509_EXTENSION *ext) { const X509V3_EXT_METHOD *method; const unsigned char *p; ASN1_STRING *extvalue; int extlen; if ((method = X509V3_EXT_get(ext)) == NULL) return NULL; extvalue = X509_EXTENSION_get_data(ext); p = ASN1_STRING_get0_data(extvalue); extlen = ASN1_STRING_length(extvalue); if (method->it) return ASN1_item_d2i(NULL, &p, extlen, ASN1_ITEM_ptr(method->it)); return method->d2i(NULL, &p, extlen); } /*- * Get critical flag and decoded version of extension from a NID. * The "idx" variable returns the last found extension and can * be used to retrieve multiple extensions of the same NID. * However multiple extensions with the same NID is usually * due to a badly encoded certificate so if idx is NULL we * choke if multiple extensions exist. * The "crit" variable is set to the critical value. * The return value is the decoded extension or NULL on * error. The actual error can have several different causes, * the value of *crit reflects the cause: * >= 0, extension found but not decoded (reflects critical value). * -1 extension not found. * -2 extension occurs more than once. */ void *X509V3_get_d2i(const STACK_OF(X509_EXTENSION) *x, int nid, int *crit, int *idx) { int lastpos, i; X509_EXTENSION *ex, *found_ex = NULL; if (!x) { if (idx) *idx = -1; if (crit) *crit = -1; return NULL; } if (idx) lastpos = *idx + 1; else lastpos = 0; if (lastpos < 0) lastpos = 0; for (i = lastpos; i < sk_X509_EXTENSION_num(x); i++) { ex = sk_X509_EXTENSION_value(x, i); if (OBJ_obj2nid(X509_EXTENSION_get_object(ex)) == nid) { if (idx) { *idx = i; found_ex = ex; break; } else if (found_ex) { /* Found more than one */ if (crit) *crit = -2; return NULL; } found_ex = ex; } } if (found_ex) { /* Found it */ if (crit) *crit = X509_EXTENSION_get_critical(found_ex); return X509V3_EXT_d2i(found_ex); } /* Extension not found */ if (idx) *idx = -1; if (crit) *crit = -1; return NULL; } /* * This function is a general extension append, replace and delete utility. * The precise operation is governed by the 'flags' value. The 'crit' and * 'value' arguments (if relevant) are the extensions internal structure. */ int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value, int crit, unsigned long flags) { int errcode, extidx = -1; X509_EXTENSION *ext = NULL, *extmp; STACK_OF(X509_EXTENSION) *ret = NULL; unsigned long ext_op = flags & X509V3_ADD_OP_MASK; /* * If appending we don't care if it exists, otherwise look for existing * extension. */ if (ext_op != X509V3_ADD_APPEND) extidx = X509v3_get_ext_by_NID(*x, nid, -1); /* See if extension exists */ if (extidx >= 0) { /* If keep existing, nothing to do */ if (ext_op == X509V3_ADD_KEEP_EXISTING) return 1; /* If default then its an error */ if (ext_op == X509V3_ADD_DEFAULT) { errcode = X509V3_R_EXTENSION_EXISTS; goto err; } /* If delete, just delete it */ if (ext_op == X509V3_ADD_DELETE) { extmp = sk_X509_EXTENSION_delete(*x, extidx); if (extmp == NULL) return -1; X509_EXTENSION_free(extmp); return 1; } } else { /* * If replace existing or delete, error since extension must exist */ if ((ext_op == X509V3_ADD_REPLACE_EXISTING) || (ext_op == X509V3_ADD_DELETE)) { errcode = X509V3_R_EXTENSION_NOT_FOUND; goto err; } } /* * If we get this far then we have to create an extension: could have * some flags for alternative encoding schemes... */ ext = X509V3_EXT_i2d(nid, crit, value); if (!ext) { ERR_raise(ERR_LIB_X509V3, X509V3_R_ERROR_CREATING_EXTENSION); return 0; } /* If extension exists replace it.. */ if (extidx >= 0) { extmp = sk_X509_EXTENSION_value(*x, extidx); X509_EXTENSION_free(extmp); if (!sk_X509_EXTENSION_set(*x, extidx, ext)) return -1; return 1; } ret = *x; if (*x == NULL && (ret = sk_X509_EXTENSION_new_null()) == NULL) goto m_fail; if (!sk_X509_EXTENSION_push(ret, ext)) goto m_fail; *x = ret; return 1; m_fail: /* ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB); */ if (ret != *x) sk_X509_EXTENSION_free(ret); X509_EXTENSION_free(ext); return -1; err: if (!(flags & X509V3_ADD_SILENT)) ERR_raise(ERR_LIB_X509V3, errcode); return 0; }