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openssl/crypto/x509/by_dir.c

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/*
* Copyright 1995-2022 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
*/
#if defined (__TANDEM) && defined (_SPT_MODEL_)
/*
* These definitions have to come first in SPT due to scoping of the
* declarations in c99 associated with SPT use of stat.
*/
# include <sys/types.h>
# include <sys/stat.h>
#endif
#include "internal/e_os.h"
#include "internal/cryptlib.h"
#include <stdio.h>
#include <time.h>
#include <errno.h>
#include <sys/types.h>
#ifndef OPENSSL_NO_POSIX_IO
# include <sys/stat.h>
#endif
#include <openssl/x509.h>
#include "crypto/x509.h"
#include "x509_local.h"
struct lookup_dir_hashes_st {
unsigned long hash;
int suffix;
};
struct lookup_dir_entry_st {
char *dir;
int dir_type;
STACK_OF(BY_DIR_HASH) *hashes;
};
typedef struct lookup_dir_st {
BUF_MEM *buffer;
STACK_OF(BY_DIR_ENTRY) *dirs;
CRYPTO_RWLOCK *lock;
} BY_DIR;
static int dir_ctrl(X509_LOOKUP *ctx, int cmd, const char *argp, long argl,
char **retp);
static int new_dir(X509_LOOKUP *lu);
static void free_dir(X509_LOOKUP *lu);
static int add_cert_dir(BY_DIR *ctx, const char *dir, int type);
static int get_cert_by_subject(X509_LOOKUP *xl, X509_LOOKUP_TYPE type,
const X509_NAME *name, X509_OBJECT *ret);
static int get_cert_by_subject_ex(X509_LOOKUP *xl, X509_LOOKUP_TYPE type,
const X509_NAME *name, X509_OBJECT *ret,
OSSL_LIB_CTX *libctx, const char *propq);
static X509_LOOKUP_METHOD x509_dir_lookup = {
"Load certs from files in a directory",
new_dir, /* new_item */
free_dir, /* free */
NULL, /* init */
NULL, /* shutdown */
dir_ctrl, /* ctrl */
get_cert_by_subject, /* get_by_subject */
NULL, /* get_by_issuer_serial */
NULL, /* get_by_fingerprint */
NULL, /* get_by_alias */
get_cert_by_subject_ex, /* get_by_subject_ex */
NULL, /* ctrl_ex */
};
X509_LOOKUP_METHOD *X509_LOOKUP_hash_dir(void)
{
return &x509_dir_lookup;
}
static int dir_ctrl(X509_LOOKUP *ctx, int cmd, const char *argp, long argl,
char **retp)
{
int ret = 0;
BY_DIR *ld = (BY_DIR *)ctx->method_data;
switch (cmd) {
case X509_L_ADD_DIR:
if (argl == X509_FILETYPE_DEFAULT) {
/* If SSL_CERT_PATH is provided and non-empty, use that. */
const char *dir = ossl_safe_getenv(X509_get_default_cert_path_env());
/* Fallback to SSL_CERT_DIR. */
if (dir == NULL)
dir = ossl_safe_getenv(X509_get_default_cert_dir_env());
/* Fallback to built-in default. */
if (dir == NULL)
dir = X509_get_default_cert_dir();
ret = add_cert_dir(ld, dir, X509_FILETYPE_PEM);
if (!ret) {
ERR_raise(ERR_LIB_X509, X509_R_LOADING_CERT_DIR);
}
} else
ret = add_cert_dir(ld, argp, (int)argl);
break;
}
return ret;
}
static int new_dir(X509_LOOKUP *lu)
{
BY_DIR *a = OPENSSL_malloc(sizeof(*a));
if (a == NULL)
return 0;
if ((a->buffer = BUF_MEM_new()) == NULL) {
ERR_raise(ERR_LIB_X509, ERR_R_BN_LIB);
goto err;
}
a->dirs = NULL;
a->lock = CRYPTO_THREAD_lock_new();
if (a->lock == NULL) {
BUF_MEM_free(a->buffer);
ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
goto err;
}
lu->method_data = a;
return 1;
err:
OPENSSL_free(a);
return 0;
}
static void by_dir_hash_free(BY_DIR_HASH *hash)
{
OPENSSL_free(hash);
}
static int by_dir_hash_cmp(const BY_DIR_HASH *const *a,
const BY_DIR_HASH *const *b)
{
if ((*a)->hash > (*b)->hash)
return 1;
if ((*a)->hash < (*b)->hash)
return -1;
return 0;
}
static void by_dir_entry_free(BY_DIR_ENTRY *ent)
{
OPENSSL_free(ent->dir);
sk_BY_DIR_HASH_pop_free(ent->hashes, by_dir_hash_free);
OPENSSL_free(ent);
}
static void free_dir(X509_LOOKUP *lu)
{
BY_DIR *a = (BY_DIR *)lu->method_data;
sk_BY_DIR_ENTRY_pop_free(a->dirs, by_dir_entry_free);
BUF_MEM_free(a->buffer);
CRYPTO_THREAD_lock_free(a->lock);
OPENSSL_free(a);
}
static int add_cert_dir(BY_DIR *ctx, const char *dir, int type)
{
int j;
size_t len;
const char *s, *ss, *p;
if (dir == NULL || *dir == '\0') {
ERR_raise(ERR_LIB_X509, X509_R_INVALID_DIRECTORY);
return 0;
}
s = dir;
p = s;
do {
if ((*p == LIST_SEPARATOR_CHAR) || (*p == '\0')) {
BY_DIR_ENTRY *ent;
ss = s;
s = p + 1;
len = p - ss;
if (len == 0)
continue;
for (j = 0; j < sk_BY_DIR_ENTRY_num(ctx->dirs); j++) {
ent = sk_BY_DIR_ENTRY_value(ctx->dirs, j);
if (strlen(ent->dir) == len && strncmp(ent->dir, ss, len) == 0)
break;
}
if (j < sk_BY_DIR_ENTRY_num(ctx->dirs))
continue;
if (ctx->dirs == NULL) {
ctx->dirs = sk_BY_DIR_ENTRY_new_null();
if (!ctx->dirs) {
ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
return 0;
}
}
ent = OPENSSL_malloc(sizeof(*ent));
if (ent == NULL)
return 0;
ent->dir_type = type;
ent->hashes = sk_BY_DIR_HASH_new(by_dir_hash_cmp);
ent->dir = OPENSSL_strndup(ss, len);
if (ent->dir == NULL || ent->hashes == NULL) {
by_dir_entry_free(ent);
return 0;
}
if (!sk_BY_DIR_ENTRY_push(ctx->dirs, ent)) {
by_dir_entry_free(ent);
ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
return 0;
}
}
} while (*p++ != '\0');
return 1;
}
static int get_cert_by_subject_ex(X509_LOOKUP *xl, X509_LOOKUP_TYPE type,
const X509_NAME *name, X509_OBJECT *ret,
OSSL_LIB_CTX *libctx, const char *propq)
{
BY_DIR *ctx;
union {
X509 st_x509;
X509_CRL crl;
} data;
int ok = 0;
int i, j, k;
unsigned long h;
BUF_MEM *b = NULL;
X509_OBJECT stmp, *tmp;
const char *postfix = "";
if (name == NULL)
return 0;
stmp.type = type;
if (type == X509_LU_X509) {
data.st_x509.cert_info.subject = (X509_NAME *)name; /* won't modify it */
stmp.data.x509 = &data.st_x509;
} else if (type == X509_LU_CRL) {
data.crl.crl.issuer = (X509_NAME *)name; /* won't modify it */
stmp.data.crl = &data.crl;
postfix = "r";
} else {
ERR_raise(ERR_LIB_X509, X509_R_WRONG_LOOKUP_TYPE);
goto finish;
}
if ((b = BUF_MEM_new()) == NULL) {
ERR_raise(ERR_LIB_X509, ERR_R_BUF_LIB);
goto finish;
}
ctx = (BY_DIR *)xl->method_data;
h = X509_NAME_hash_ex(name, libctx, propq, &i);
if (i == 0)
goto finish;
for (i = 0; i < sk_BY_DIR_ENTRY_num(ctx->dirs); i++) {
BY_DIR_ENTRY *ent;
int idx;
BY_DIR_HASH htmp, *hent;
ent = sk_BY_DIR_ENTRY_value(ctx->dirs, i);
j = strlen(ent->dir) + 1 + 8 + 6 + 1 + 1;
if (!BUF_MEM_grow(b, j)) {
ERR_raise(ERR_LIB_X509, ERR_R_BUF_LIB);
goto finish;
}
if (type == X509_LU_CRL && ent->hashes) {
htmp.hash = h;
if (!CRYPTO_THREAD_read_lock(ctx->lock))
goto finish;
idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
if (idx >= 0) {
hent = sk_BY_DIR_HASH_value(ent->hashes, idx);
k = hent->suffix;
} else {
hent = NULL;
k = 0;
}
CRYPTO_THREAD_unlock(ctx->lock);
} else {
k = 0;
hent = NULL;
}
for (;;) {
char c = '/';
#ifdef OPENSSL_SYS_VMS
c = ent->dir[strlen(ent->dir) - 1];
if (c != ':' && c != '>' && c != ']') {
/*
* If no separator is present, we assume the directory
* specifier is a logical name, and add a colon. We really
* should use better VMS routines for merging things like
* this, but this will do for now... -- Richard Levitte
*/
c = ':';
} else {
c = '\0';
}
if (c == '\0') {
/*
* This is special. When c == '\0', no directory separator
* should be added.
*/
BIO_snprintf(b->data, b->max,
"%s%08lx.%s%d", ent->dir, h, postfix, k);
} else
#endif
{
BIO_snprintf(b->data, b->max,
"%s%c%08lx.%s%d", ent->dir, c, h, postfix, k);
}
#ifndef OPENSSL_NO_POSIX_IO
# ifdef _WIN32
# define stat _stat
# endif
{
struct stat st;
if (stat(b->data, &st) < 0)
break;
}
#endif
/* found one. */
if (type == X509_LU_X509) {
if ((X509_load_cert_file_ex(xl, b->data, ent->dir_type, libctx,
propq)) == 0)
break;
} else if (type == X509_LU_CRL) {
if ((X509_load_crl_file(xl, b->data, ent->dir_type)) == 0)
break;
}
/* else case will caught higher up */
k++;
}
/*
* we have added it to the cache so now pull it out again
*/
X509_STORE_lock(xl->store_ctx);
j = sk_X509_OBJECT_find(xl->store_ctx->objs, &stmp);
tmp = sk_X509_OBJECT_value(xl->store_ctx->objs, j);
X509_STORE_unlock(xl->store_ctx);
/*
* If a CRL, update the last file suffix added for this.
* We don't need to add an entry if k is 0 as this is the initial value.
* This avoids the need for a write lock and sort operation in the
* simple case where no CRL is present for a hash.
*/
if (type == X509_LU_CRL && k > 0) {
if (!CRYPTO_THREAD_write_lock(ctx->lock))
goto finish;
/*
* Look for entry again in case another thread added an entry
* first.
*/
if (hent == NULL) {
htmp.hash = h;
idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
hent = sk_BY_DIR_HASH_value(ent->hashes, idx);
}
if (hent == NULL) {
hent = OPENSSL_malloc(sizeof(*hent));
if (hent == NULL) {
CRYPTO_THREAD_unlock(ctx->lock);
ok = 0;
goto finish;
}
hent->hash = h;
hent->suffix = k;
if (!sk_BY_DIR_HASH_push(ent->hashes, hent)) {
CRYPTO_THREAD_unlock(ctx->lock);
OPENSSL_free(hent);
ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
ok = 0;
goto finish;
}
/*
* Ensure stack is sorted so that subsequent sk_BY_DIR_HASH_find
* will not mutate the stack and therefore require a write lock.
*/
sk_BY_DIR_HASH_sort(ent->hashes);
} else if (hent->suffix < k) {
hent->suffix = k;
}
CRYPTO_THREAD_unlock(ctx->lock);
}
if (tmp != NULL) {
ok = 1;
ret->type = tmp->type;
memcpy(&ret->data, &tmp->data, sizeof(ret->data));
/*
* Clear any errors that might have been raised processing empty
* or malformed files.
*/
ERR_clear_error();
goto finish;
}
}
finish:
BUF_MEM_free(b);
return ok;
}
static int get_cert_by_subject(X509_LOOKUP *xl, X509_LOOKUP_TYPE type,
const X509_NAME *name, X509_OBJECT *ret)
{
return get_cert_by_subject_ex(xl, type, name, ret, NULL, NULL);
}
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