X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Frsa%2Frsa_sign.c;h=0be4ec7fb01f08b04e2e6558fc5a9df80d4c8a7a;hp=e50c839279d89adb48232067c7a106ceba294677;hb=d76b8c89ec218b3ce6c83e27220d2df4d0213599;hpb=875a644a9047e96dfcce27af876d30460759805e

diff --git a/crypto/rsa/rsa_sign.c b/crypto/rsa/rsa_sign.c
index e50c839279..0be4ec7fb0 100644
--- a/crypto/rsa/rsa_sign.c
+++ b/crypto/rsa/rsa_sign.c
@@ -62,6 +62,7 @@
 #include <openssl/rsa.h>
 #include <openssl/objects.h>
 #include <openssl/x509.h>
+#include "rsa_locl.h"
 
 /* Size of an SSL signature: MD5+SHA1 */
 #define SSL_SIG_LENGTH	36
@@ -76,7 +77,7 @@ int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
 	const unsigned char *s = NULL;
 	X509_ALGOR algor;
 	ASN1_OCTET_STRING digest;
-	if(rsa->flags & RSA_FLAG_SIGN_VER)
+	if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_sign)
 		{
 		return rsa->meth->rsa_sign(type, m, m_len,
 			sigret, siglen, rsa);
@@ -142,8 +143,11 @@ int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
 	return(ret);
 	}
 
-int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
-	     unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
+int int_rsa_verify(int dtype, const unsigned char *m,
+			  unsigned int m_len,
+			  unsigned char *rm, size_t *prm_len,
+			  const unsigned char *sigbuf, size_t siglen,
+			  RSA *rsa)
 	{
 	int i,ret=0,sigtype;
 	unsigned char *s;
@@ -151,25 +155,29 @@ int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
 
 	if (siglen != (unsigned int)RSA_size(rsa))
 		{
-		RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
+		RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
 		return(0);
 		}
 
-	if(rsa->flags & RSA_FLAG_SIGN_VER)
+	if((dtype == NID_md5_sha1) && rm)
 		{
-		return rsa->meth->rsa_verify(dtype, m, m_len,
-			sigbuf, siglen, rsa);
+		i = RSA_public_decrypt((int)siglen,
+					sigbuf,rm,rsa,RSA_PKCS1_PADDING);
+		if (i <= 0)
+			return 0;
+		*prm_len = i;
+		return 1;
 		}
 
 	s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen);
 	if (s == NULL)
 		{
-		RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
+		RSAerr(RSA_F_INT_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
 		goto err;
 		}
 	if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) {
-			RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
-			return(0);
+			RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
+			goto err;
 	}
 	i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
 
@@ -178,13 +186,30 @@ int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
 	/* Special case: SSL signature */
 	if(dtype == NID_md5_sha1) {
 		if((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH))
-				RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
+				RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
 		else ret = 1;
 	} else {
 		const unsigned char *p=s;
 		sig=d2i_X509_SIG(NULL,&p,(long)i);
 
 		if (sig == NULL) goto err;
+
+		/* Excess data can be used to create forgeries */
+		if(p != s+i)
+			{
+			RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
+			goto err;
+			}
+
+		/* Parameters to the signature algorithm can also be used to
+		   create forgeries */
+		if(sig->algor->parameter
+		   && ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL)
+			{
+			RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
+			goto err;
+			}
+
 		sigtype=OBJ_obj2nid(sig->algor->algorithm);
 
 
@@ -207,23 +232,54 @@ int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
 				}
 			else
 				{
-				RSAerr(RSA_F_RSA_VERIFY,
+				RSAerr(RSA_F_INT_RSA_VERIFY,
 						RSA_R_ALGORITHM_MISMATCH);
 				goto err;
 				}
 			}
-		if (	((unsigned int)sig->digest->length != m_len) ||
+		if (rm)
+			{
+			const EVP_MD *md;
+			md = EVP_get_digestbynid(dtype);
+			if (md && (EVP_MD_size(md) != sig->digest->length))
+				RSAerr(RSA_F_INT_RSA_VERIFY,
+						RSA_R_INVALID_DIGEST_LENGTH);
+			else
+				{
+				memcpy(rm, sig->digest->data,
+							sig->digest->length);
+				*prm_len = sig->digest->length;
+				ret = 1;
+				}
+			}
+		else if (((unsigned int)sig->digest->length != m_len) ||
 			(memcmp(m,sig->digest->data,m_len) != 0))
 			{
-			RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
+			RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
 			}
 		else
 			ret=1;
 	}
 err:
 	if (sig != NULL) X509_SIG_free(sig);
-	OPENSSL_cleanse(s,(unsigned int)siglen);
-	OPENSSL_free(s);
+	if (s != NULL)
+		{
+		OPENSSL_cleanse(s,(unsigned int)siglen);
+		OPENSSL_free(s);
+		}
 	return(ret);
 	}
 
+int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
+		const unsigned char *sigbuf, unsigned int siglen,
+		RSA *rsa)
+	{
+
+	if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify)
+		{
+		return rsa->meth->rsa_verify(dtype, m, m_len,
+			sigbuf, siglen, rsa);
+		}
+
+	return int_rsa_verify(dtype, m, m_len, NULL, NULL, sigbuf, siglen, rsa);
+	}