Adding upstream version 252.22.upstream/252.22

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 216 insertions, 0 deletions

diff --git a/src/shared/openssl-util.c b/src/shared/openssl-util.c
new file mode 100644
index 0000000..c7fcbd9
--- /dev/null
+++ b/src/shared/openssl-util.c
@@ -0,0 +1,216 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#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,
+                size_t decrypted_key_size,
+                void **ret_encrypt_key,
+                size_t *ret_encrypt_key_size) {
+
+        _cleanup_(EVP_PKEY_CTX_freep) EVP_PKEY_CTX *ctx = NULL;
+        _cleanup_free_ void *b = NULL;
+        size_t l;
+
+        ctx = EVP_PKEY_CTX_new(pkey, NULL);
+        if (!ctx)
+                return log_debug_errno(SYNTHETIC_ERRNO(EIO), "Failed to allocate public key context");
+
+        if (EVP_PKEY_encrypt_init(ctx) <= 0)
+                return log_debug_errno(SYNTHETIC_ERRNO(EIO), "Failed to initialize public key context");
+
+        if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0)
+                return log_debug_errno(SYNTHETIC_ERRNO(EIO), "Failed to configure PKCS#1 padding");
+
+        if (EVP_PKEY_encrypt(ctx, NULL, &l, decrypted_key, decrypted_key_size) <= 0)
+                return log_debug_errno(SYNTHETIC_ERRNO(EIO), "Failed to determine encrypted key size");
+
+        b = malloc(l);
+        if (!b)
+                return -ENOMEM;
+
+        if (EVP_PKEY_encrypt(ctx, b, &l, decrypted_key, decrypted_key_size) <= 0)
+                return log_debug_errno(SYNTHETIC_ERRNO(EIO), "Failed to determine encrypted key size");
+
+        *ret_encrypt_key = TAKE_PTR(b);
+        *ret_encrypt_key_size = l;
+
+        return 0;
+}
+
+int rsa_pkey_to_suitable_key_size(
+                EVP_PKEY *pkey,
+                size_t *ret_suitable_key_size) {
+
+        size_t suitable_key_size;
+        int bits;
+
+        assert(pkey);
+        assert(ret_suitable_key_size);
+
+        /* Analyzes the specified public key and that it is RSA. If so, will return a suitable size for a
+         * disk encryption key to encrypt with RSA for use in PKCS#11 security token schemes. */
+
+        if (EVP_PKEY_base_id(pkey) != EVP_PKEY_RSA)
+                return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), "X.509 certificate does not refer to RSA key.");
+
+        bits = EVP_PKEY_bits(pkey);
+        log_debug("Bits in RSA key: %i", bits);
+
+        /* We use PKCS#1 padding for the RSA cleartext, hence let's leave some extra space for it, hence only
+         * generate a random key half the size of the RSA length */
+        suitable_key_size = bits / 8 / 2;
+
+        if (suitable_key_size < 1)
+                return log_debug_errno(SYNTHETIC_ERRNO(EIO), "Uh, RSA key size too short?");
+
+        *ret_suitable_key_size = suitable_key_size;
+        return 0;
+}
+
+int pubkey_fingerprint(EVP_PKEY *pk, const EVP_MD *md, void **ret, size_t *ret_size) {
+        _cleanup_(EVP_MD_CTX_freep) EVP_MD_CTX* m = NULL;
+        _cleanup_free_ void *d = NULL, *h = NULL;
+        int sz, lsz, msz;
+        unsigned umsz;
+        unsigned char *dd;
+
+        /* Calculates a message digest of the DER encoded public key */
+
+        assert(pk);
+        assert(md);
+        assert(ret);
+        assert(ret_size);
+
+        sz = i2d_PublicKey(pk, NULL);
+        if (sz < 0)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Unable to convert public key to DER format: %s",
+                                       ERR_error_string(ERR_get_error(), NULL));
+
+        dd = d = malloc(sz);
+        if (!d)
+                return log_oom_debug();
+
+        lsz = i2d_PublicKey(pk, &dd);
+        if (lsz < 0)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Unable to convert public key to DER format: %s",
+                                       ERR_error_string(ERR_get_error(), NULL));
+
+        m = EVP_MD_CTX_new();
+        if (!m)
+                return log_oom_debug();
+
+        if (EVP_DigestInit_ex(m, md, NULL) != 1)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to initialize %s context.", EVP_MD_name(md));
+
+        if (EVP_DigestUpdate(m, d, lsz) != 1)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to run %s context.", EVP_MD_name(md));
+
+        msz = EVP_MD_size(md);
+        assert(msz > 0);
+
+        h = malloc(msz);
+        if (!h)
+                return log_oom_debug();
+
+        umsz = msz;
+        if (EVP_DigestFinal_ex(m, h, &umsz) != 1)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to finalize hash context.");
+
+        assert(umsz == (unsigned) msz);
+
+        *ret = TAKE_PTR(h);
+        *ret_size = msz;
+
+        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
+
+int x509_fingerprint(X509 *cert, uint8_t buffer[static SHA256_DIGEST_SIZE]) {
+#if HAVE_OPENSSL
+        _cleanup_free_ uint8_t *der = NULL;
+        int dersz;
+
+        assert(cert);
+
+        dersz = i2d_X509(cert, &der);
+        if (dersz < 0)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Unable to convert PEM certificate to DER format: %s",
+                                       ERR_error_string(ERR_get_error(), NULL));
+
+        sha256_direct(der, dersz, buffer);
+        return 0;
+#else
+        return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "openssl is not supported, cannot calculate X509 fingerprint: %m");
+#endif
+}