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userauth: Provide more informations if ssh pub key extraction fails

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If the function that extracts/computes the public key from a private key
fails the errors it reports were masked by the function calling it. This
patch modifies the key extraction function to return errors using
_libssh_error() function.  The error messages are tweaked to contain
reference to the failed operaton in addition to the reason.

 * AUTHORS: - add my name
 * libgcrypt.c: _libssh2_pub_priv_keyfile(): - return a more verbose
                                               error using
                                               _libssh2_error() func.
 * openssl.c: - modify call graph of _libssh2_pub_priv_keyfile() to use
                _libssh2_error for error reporting();
 * userauth.c: - tweak functions calling _libssh2_pub_priv_keyfile() not
                 to shadow error messages
This commit is contained in:
Peter Krempa
2011-12-19 15:02:15 +01:00
committed by Daniel Stenberg
parent b8dd697796
commit 209de22299
4 changed files with 43 additions and 40 deletions
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1
AUTHORS
View File

@@ -29,6 +29,7 @@ Mikhail Gusarov
Neil Gierman
Olivier Hervieu
Paul Veldkamp
Peter Krempa
Peter O'Gorman
Peter Stuge
Romain Bondue

5
src/libgcrypt.c
View File

@@ -581,8 +581,9 @@ _libssh2_pub_priv_keyfile(LIBSSH2_SESSION *session,
const char *privatekey,
const char *passphrase)
{
return -1; /* not yet supported; interpreted by userauth.c to call
libssh2_error */
return _libssh_error(session, LIBSSH2_ERROR_FILE,
"Unable to extract public key from private key file: "
"Method unimplemented in libgcrypt backend");
}
void _libssh2_init_aes_ctr(void)

22
src/openssl.c
View File

@@ -666,10 +666,9 @@ gen_publickey_from_rsa_evp(LIBSSH2_SESSION *session,
LIBSSH2_FREE(session, method_buf);
}
_libssh2_error(session,
return _libssh2_error(session,
LIBSSH2_ERROR_ALLOC,
"Unable to allocate memory for private key data");
return -1;
}
static int
@@ -721,10 +720,9 @@ gen_publickey_from_dsa_evp(LIBSSH2_SESSION *session,
LIBSSH2_FREE(session, method_buf);
}
_libssh2_error(session,
return _libssh2_error(session,
LIBSSH2_ERROR_ALLOC,
"Unable to allocate memory for private key data");
return -1;
}
int
@@ -747,10 +745,10 @@ _libssh2_pub_priv_keyfile(LIBSSH2_SESSION *session,
bp = BIO_new_file(privatekey, "r");
if (bp == NULL) {
_libssh2_error(session,
return _libssh2_error(session,
LIBSSH2_ERROR_FILE,
"Unable to open private key file");
return -1;
"Unable to extract public key from private key "
"file: Unable to open private key file");
}
if (!EVP_get_cipherbyname("des")) {
/* If this cipher isn't loaded it's a pretty good indication that none
@@ -765,11 +763,12 @@ _libssh2_pub_priv_keyfile(LIBSSH2_SESSION *session,
BIO_free(bp);
if (pk == NULL) {
_libssh2_error(session,
return _libssh2_error(session,
LIBSSH2_ERROR_FILE,
"Unable to extract public key "
"from private key file: "
"Wrong passphrase or invalid/unrecognized "
"private key file format");
return -1;
}
switch (pk->type) {
@@ -784,9 +783,10 @@ _libssh2_pub_priv_keyfile(LIBSSH2_SESSION *session,
break;
default :
st = -1;
_libssh2_error(session,
st = _libssh2_error(session,
LIBSSH2_ERROR_FILE,
"Unable to extract public key "
"from private key file: "
"Unsupported private key file format");
break;
}

21
src/userauth.c
View File

@@ -665,14 +665,14 @@ userauth_hostbased_fromfile(LIBSSH2_SESSION *session,
}
else {
/* Compute public key from private key. */
if (_libssh2_pub_priv_keyfile(session,
rc = _libssh2_pub_priv_keyfile(session,
&session->userauth_host_method,
&session->userauth_host_method_len,
&pubkeydata, &pubkeydata_len,
privatekey, passphrase))
return _libssh2_error(session, LIBSSH2_ERROR_FILE,
"Unable to extract public key "
"from private key file");
privatekey, passphrase);
if (rc)
/* libssh2_pub_priv_keyfile calls _libssh2_error() */
return rc;
}
/*
@@ -1242,14 +1242,15 @@ userauth_publickey_fromfile(LIBSSH2_SESSION *session,
}
else {
/* Compute public key from private key. */
if (_libssh2_pub_priv_keyfile(session,
rc = _libssh2_pub_priv_keyfile(session,
&session->userauth_pblc_method,
&session->userauth_pblc_method_len,
&pubkeydata, &pubkeydata_len,
privatekey, passphrase))
return _libssh2_error(session, LIBSSH2_ERROR_FILE,
"Unable to extract public key "
"from private key file");
privatekey, passphrase);
/* _libssh2_pub_priv_keyfile calls _libssh2_error() */
if (rc)
return rc;
}
}