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From 381af470779ea87335f57038dcbe72cd042ae6bb Mon Sep 17 00:00:00 2001
From: Stanislav Levin <slev@altlinux.org>
Date: Jan 30 2024 15:11:05 +0000
Subject: ipapython: Clean up krb5_error
`krb5_error` has different definition in MIT krb.
https://web.mit.edu/kerberos/krb5-latest/doc/appdev/refs/types/krb5_error.html
> Error message structure.
>
> Declaration:
> typedef struct _krb5_error krb5_error
While `krb5_error_code`
https://web.mit.edu/kerberos/www/krb5-latest/doc/appdev/refs/types/krb5_error_code.html#c.krb5_error_code
> krb5_error_code
> Used to convey an operation status.
>
> The value 0 indicates success; any other values are com_err codes. Use krb5_get_error_message() to obtain a string describing the error.
>
> Declaration
> typedef krb5_int32 krb5_error_code
And this is what was actually used.
To prevent confusion of types `krb5_error` was replaced with
`krb5_error_code`.
Fixes: https://pagure.io/freeipa/issue/9519
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
---
diff --git a/ipapython/session_storage.py b/ipapython/session_storage.py
index c43ef7d..371cf15 100644
--- a/ipapython/session_storage.py
+++ b/ipapython/session_storage.py
@@ -111,7 +111,7 @@ class KRB5Error(Exception):
def krb5_errcheck(result, func, arguments):
- """Error checker for krb5_error return value"""
+ """Error checker for krb5_error_code return value"""
if result != 0:
raise KRB5Error(result, func.__name__, arguments)
@@ -119,14 +119,13 @@ def krb5_errcheck(result, func, arguments):
krb5_context = ctypes.POINTER(_krb5_context)
krb5_ccache = ctypes.POINTER(_krb5_ccache)
krb5_data_p = ctypes.POINTER(_krb5_data)
-krb5_error = ctypes.c_int32
krb5_creds = _krb5_creds
krb5_pointer = ctypes.c_void_p
krb5_cc_cursor = krb5_pointer
krb5_init_context = LIBKRB5.krb5_init_context
krb5_init_context.argtypes = (ctypes.POINTER(krb5_context), )
-krb5_init_context.restype = krb5_error
+krb5_init_context.restype = krb5_error_code
krb5_init_context.errcheck = krb5_errcheck
krb5_free_context = LIBKRB5.krb5_free_context
@@ -143,30 +142,30 @@ krb5_free_data_contents.restype = None
krb5_cc_default = LIBKRB5.krb5_cc_default
krb5_cc_default.argtypes = (krb5_context, ctypes.POINTER(krb5_ccache), )
-krb5_cc_default.restype = krb5_error
+krb5_cc_default.restype = krb5_error_code
krb5_cc_default.errcheck = krb5_errcheck
krb5_cc_close = LIBKRB5.krb5_cc_close
krb5_cc_close.argtypes = (krb5_context, krb5_ccache, )
-krb5_cc_close.restype = krb5_error
+krb5_cc_close.restype = krb5_error_code
krb5_cc_close.errcheck = krb5_errcheck
krb5_parse_name = LIBKRB5.krb5_parse_name
krb5_parse_name.argtypes = (krb5_context, ctypes.c_char_p,
ctypes.POINTER(krb5_principal), )
-krb5_parse_name.restype = krb5_error
+krb5_parse_name.restype = krb5_error_code
krb5_parse_name.errcheck = krb5_errcheck
krb5_cc_set_config = LIBKRB5.krb5_cc_set_config
krb5_cc_set_config.argtypes = (krb5_context, krb5_ccache, krb5_principal,
ctypes.c_char_p, krb5_data_p, )
-krb5_cc_set_config.restype = krb5_error
+krb5_cc_set_config.restype = krb5_error_code
krb5_cc_set_config.errcheck = krb5_errcheck
krb5_cc_get_principal = LIBKRB5.krb5_cc_get_principal
krb5_cc_get_principal.argtypes = (krb5_context, krb5_ccache,
ctypes.POINTER(krb5_principal), )
-krb5_cc_get_principal.restype = krb5_error
+krb5_cc_get_principal.restype = krb5_error_code
krb5_cc_get_principal.errcheck = krb5_errcheck
# krb5_build_principal is a variadic function but that can't be expressed
@@ -177,26 +176,26 @@ krb5_build_principal.argtypes = (krb5_context, ctypes.POINTER(krb5_principal),
ctypes.c_uint, ctypes.c_char_p,
ctypes.c_char_p, ctypes.c_char_p,
ctypes.c_char_p, ctypes.c_char_p, )
-krb5_build_principal.restype = krb5_error
+krb5_build_principal.restype = krb5_error_code
krb5_build_principal.errcheck = krb5_errcheck
krb5_cc_start_seq_get = LIBKRB5.krb5_cc_start_seq_get
krb5_cc_start_seq_get.argtypes = (krb5_context, krb5_ccache,
ctypes.POINTER(krb5_cc_cursor), )
-krb5_cc_start_seq_get.restype = krb5_error
+krb5_cc_start_seq_get.restype = krb5_error_code
krb5_cc_start_seq_get.errcheck = krb5_errcheck
krb5_cc_next_cred = LIBKRB5.krb5_cc_next_cred
krb5_cc_next_cred.argtypes = (krb5_context, krb5_ccache,
ctypes.POINTER(krb5_cc_cursor),
ctypes.POINTER(krb5_creds), )
-krb5_cc_next_cred.restype = krb5_error
+krb5_cc_next_cred.restype = krb5_error_code
krb5_cc_next_cred.errcheck = krb5_errcheck
krb5_cc_end_seq_get = LIBKRB5.krb5_cc_end_seq_get
krb5_cc_end_seq_get.argtypes = (krb5_context, krb5_ccache,
ctypes.POINTER(krb5_cc_cursor), )
-krb5_cc_end_seq_get.restype = krb5_error
+krb5_cc_end_seq_get.restype = krb5_error_code
krb5_cc_end_seq_get.errcheck = krb5_errcheck
krb5_free_cred_contents = LIBKRB5.krb5_free_cred_contents
@@ -212,7 +211,7 @@ krb5_principal_compare.restype = krb5_boolean
krb5_unparse_name = LIBKRB5.krb5_unparse_name
krb5_unparse_name.argtypes = (krb5_context, krb5_principal,
ctypes.POINTER(ctypes.c_char_p), )
-krb5_unparse_name.restype = krb5_error
+krb5_unparse_name.restype = krb5_error_code
krb5_unparse_name.errcheck = krb5_errcheck
krb5_free_unparsed_name = LIBKRB5.krb5_free_unparsed_name
From 2a4bad8bb3295c5c0f5a760ecd41871c4c5a0c56 Mon Sep 17 00:00:00 2001
From: Stanislav Levin <slev@altlinux.org>
Date: Jan 30 2024 15:11:05 +0000
Subject: ipapython: Correct return type of krb5_free_cred_contents
According to https://web.mit.edu/kerberos/krb5-latest/doc/appdev/refs/api/krb5_free_cred_contents.html
> krb5_free_cred_contents - Free the contents of a krb5_creds structure.
>
> void krb5_free_cred_contents(krb5_context context, krb5_creds * val)
> param:
> [in] context - Library context
>
> [in] val - Credential structure to free contents of
>
> This function frees the contents of val , but not the structure itself.
https://github.com/krb5/krb5/blob/5b00197227231943bd2305328c8260dd0b0dbcf0/src/lib/krb5/krb/kfree.c#L166
This leads to undefined behavior and `krb5_free_cred_contents` can
raise KRB5Error (because of garbage data) while actually its foreign
function doesn't.
Fixes: https://pagure.io/freeipa/issue/9519
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
---
diff --git a/ipapython/session_storage.py b/ipapython/session_storage.py
index 371cf15..dc36f54 100644
--- a/ipapython/session_storage.py
+++ b/ipapython/session_storage.py
@@ -200,8 +200,7 @@ krb5_cc_end_seq_get.errcheck = krb5_errcheck
krb5_free_cred_contents = LIBKRB5.krb5_free_cred_contents
krb5_free_cred_contents.argtypes = (krb5_context, ctypes.POINTER(krb5_creds))
-krb5_free_cred_contents.restype = krb5_error
-krb5_free_cred_contents.errcheck = krb5_errcheck
+krb5_free_cred_contents.restype = None
krb5_principal_compare = LIBKRB5.krb5_principal_compare
krb5_principal_compare.argtypes = (krb5_context, krb5_principal,
From beb402afdbf32c01eed860e9416356f7b492ad74 Mon Sep 17 00:00:00 2001
From: Stanislav Levin <slev@altlinux.org>
Date: Jan 30 2024 15:11:05 +0000
Subject: ipapython: Propagate KRB5Error exceptions on iterating ccache
`ipapython.session_storage.get_data` iterates over
credentials in a credential cache till `krb5_cc_next_cred` returns
an error. This function doesn't expect any error on calling
other kerberos foreign functions during iteration. But that can
actually happen and KRB5Error exceptions stop an iteration while
they should be propagated.
With this change iteration will exactly stop on `krb5_cc_next_cred`
error as it was supposed to be.
Fixes: https://pagure.io/freeipa/issue/9519
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
---
diff --git a/ipapython/session_storage.py b/ipapython/session_storage.py
index dc36f54..e890dc9 100644
--- a/ipapython/session_storage.py
+++ b/ipapython/session_storage.py
@@ -312,8 +312,12 @@ def get_data(princ_name, key):
checkcreds = krb5_creds()
# the next function will throw an error and break out of the
# while loop when we try to access past the last cred
- krb5_cc_next_cred(context, ccache, ctypes.byref(cursor),
- ctypes.byref(checkcreds))
+ try:
+ krb5_cc_next_cred(context, ccache, ctypes.byref(cursor),
+ ctypes.byref(checkcreds))
+ except KRB5Error:
+ break
+
if (krb5_principal_compare(context, principal,
checkcreds.client) == 1 and
krb5_principal_compare(context, srv_princ,
@@ -328,8 +332,6 @@ def get_data(princ_name, key):
else:
krb5_free_cred_contents(context,
ctypes.byref(checkcreds))
- except KRB5Error:
- pass
finally:
krb5_cc_end_seq_get(context, ccache, ctypes.byref(cursor))
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