Merge pull request #21170 from keszybz/delibgcryptify

Allow systemd-resolved and systemd-importd to use libgcrypt or libopenssl

src/shared/openssl-util.c

@@ -2,8 +2,46 @@
 
 #include "openssl-util.h"
 #include "alloc-util.h"
+#include "hexdecoct.h"
 
 #if HAVE_OPENSSL
+int openssl_hash(const EVP_MD *alg,
+                 const void *msg,
+                 size_t msg_len,
+                 uint8_t *ret_hash,
+                 size_t *ret_hash_len) {
+
+        _cleanup_(EVP_MD_CTX_freep) EVP_MD_CTX *ctx = NULL;
+        unsigned len;
+        int r;
+
+        ctx = EVP_MD_CTX_new();
+        if (!ctx)
+                /* This function just calls OPENSSL_zalloc, so failure
+                 * here is almost certainly a failed allocation. */
+                return -ENOMEM;
+
+        /* The documentation claims EVP_DigestInit behaves just like
+         * EVP_DigestInit_ex if passed NULL, except it also calls
+         * EVP_MD_CTX_reset, which deinitializes the context. */
+        r = EVP_DigestInit_ex(ctx, alg, NULL);
+        if (r == 0)
+                return -EIO;
+
+        r = EVP_DigestUpdate(ctx, msg, msg_len);
+        if (r == 0)
+                return -EIO;
+
+        r = EVP_DigestFinal_ex(ctx, ret_hash, &len);
+        if (r == 0)
+                return -EIO;
+
+        if (ret_hash_len)
+                *ret_hash_len = len;
+
+        return 0;
+}
+
 int rsa_encrypt_bytes(
                 EVP_PKEY *pkey,
                 const void *decrypted_key,
@@ -70,4 +108,33 @@ int rsa_pkey_to_suitable_key_size(
         *ret_suitable_key_size = suitable_key_size;
         return 0;
 }
+
+#  if PREFER_OPENSSL
+int string_hashsum(
+                const char *s,
+                size_t len,
+                const EVP_MD *md_algorithm,
+                char **ret) {
+
+        uint8_t hash[EVP_MAX_MD_SIZE];
+        size_t hash_size;
+        char *enc;
+        int r;
+
+        hash_size = EVP_MD_size(md_algorithm);
+        assert(hash_size > 0);
+
+        r = openssl_hash(md_algorithm, s, len, hash, NULL);
+        if (r < 0)
+                return r;
+
+        enc = hexmem(hash, hash_size);
+        if (!enc)
+                return -ENOMEM;
+
+        *ret = enc;
+        return 0;
+
+}
+#  endif
 #endif

src/shared/openssl-util.h

@@ -5,6 +5,8 @@
 
 #if HAVE_OPENSSL
 #  include <openssl/bio.h>
+#  include <openssl/bn.h>
+#  include <openssl/err.h>
 #  include <openssl/evp.h>
 #  include <openssl/pkcs7.h>
 #  include <openssl/ssl.h>
@@ -13,7 +15,15 @@
 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(X509*, X509_free, NULL);
 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(X509_NAME*, X509_NAME_free, NULL);
 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(EVP_PKEY_CTX*, EVP_PKEY_CTX_free, NULL);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(EVP_PKEY*, EVP_PKEY_free, NULL);
 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(EVP_CIPHER_CTX*, EVP_CIPHER_CTX_free, NULL);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(RSA*, RSA_free, NULL);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(EC_KEY*, EC_KEY_free, NULL);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(EC_POINT*, EC_POINT_free, NULL);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(EC_GROUP*, EC_GROUP_free, NULL);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(BIGNUM*, BN_free, NULL);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(BN_CTX*, BN_CTX_free, NULL);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(ECDSA_SIG*, ECDSA_SIG_free, NULL);
 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(PKCS7*, PKCS7_free, NULL);
 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(SSL*, SSL_free, NULL);
 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(BIO*, BIO_free, NULL);
@@ -26,8 +36,41 @@ static inline void sk_X509_free_allp(STACK_OF(X509) **sk) {
         sk_X509_pop_free(*sk, X509_free);
 }
 
+int openssl_hash(const EVP_MD *alg, const void *msg, size_t msg_len, uint8_t *ret_hash, size_t *ret_hash_len);
+
 int rsa_encrypt_bytes(EVP_PKEY *pkey, const void *decrypted_key, size_t decrypted_key_size, void **ret_encrypt_key, size_t *ret_encrypt_key_size);
 
 int rsa_pkey_to_suitable_key_size(EVP_PKEY *pkey, size_t *ret_suitable_key_size);
+#endif
 
+#if PREFER_OPENSSL
+/* The openssl definition */
+typedef const EVP_MD* hash_md_t;
+typedef const EVP_MD* hash_algorithm_t;
+typedef int elliptic_curve_t;
+typedef EVP_MD_CTX* hash_context_t;
+#  define OPENSSL_OR_GCRYPT(a, b) (a)
+
+#elif HAVE_GCRYPT
+
+#  include <gcrypt.h>
+
+/* The gcrypt definition */
+typedef int hash_md_t;
+typedef const char* hash_algorithm_t;
+typedef const char* elliptic_curve_t;
+typedef gcry_md_hd_t hash_context_t;
+#  define OPENSSL_OR_GCRYPT(a, b) (b)
+#endif
+
+#if PREFER_OPENSSL
+int string_hashsum(const char *s, size_t len, hash_algorithm_t md_algorithm, char **ret);
+
+static inline int string_hashsum_sha224(const char *s, size_t len, char **ret) {
+        return string_hashsum(s, len, EVP_sha224(), ret);
+}
+
+static inline int string_hashsum_sha256(const char *s, size_t len, char **ret) {
+        return string_hashsum(s, len, EVP_sha256(), ret);
+}
 #endif