5f63215d0d
Although not required to address bad code generation in
some versions of gcc 9 and 10, a coding style that requires
explicit comparison of the result to zero before use is
both clearer and would have avoided the generation of bad
code.
This change converts all use of cmp function usage from
```
if (strcmp(a, b) || !strcmp(c, d)) ...
```
to
```
if (strcmp(a, b) != 0 || strcmp(c, d)) == 0
```
for all C library cmp functions and related:
- strcmp(), strncmp()
- strcasecmp(), strncasecmp()
- stricmp(), strnicmp()
- memcmp()
Change-Id: Ic60c15e1e3a07e4faaf10648eefe3adae2543188
327 lines
8.2 KiB
C
327 lines
8.2 KiB
C
/*
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* Copyright (c) 1997-2001 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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#include <vis.h>
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struct krb5_rcache_data {
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char *name;
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};
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_rc_resolve(krb5_context context,
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krb5_rcache id,
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const char *name)
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{
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id->name = strdup(name);
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if(id->name == NULL) {
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krb5_set_error_message(context, KRB5_RC_MALLOC,
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N_("malloc: out of memory", ""));
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return KRB5_RC_MALLOC;
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}
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return 0;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_rc_resolve_type(krb5_context context,
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krb5_rcache *id,
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const char *type)
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{
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*id = NULL;
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if (strcmp(type, "FILE") != 0) {
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krb5_set_error_message (context, KRB5_RC_TYPE_NOTFOUND,
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N_("replay cache type %s not supported", ""),
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type);
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return KRB5_RC_TYPE_NOTFOUND;
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}
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*id = calloc(1, sizeof(**id));
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if(*id == NULL) {
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krb5_set_error_message(context, KRB5_RC_MALLOC,
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N_("malloc: out of memory", ""));
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return KRB5_RC_MALLOC;
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}
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return 0;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_rc_resolve_full(krb5_context context,
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krb5_rcache *id,
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const char *string_name)
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{
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krb5_error_code ret;
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*id = NULL;
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if (strncmp(string_name, "FILE:", 5) != 0) {
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krb5_set_error_message(context, KRB5_RC_TYPE_NOTFOUND,
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N_("replay cache type %s not supported", ""),
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string_name);
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return KRB5_RC_TYPE_NOTFOUND;
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}
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ret = krb5_rc_resolve_type(context, id, "FILE");
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if(ret)
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return ret;
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ret = krb5_rc_resolve(context, *id, string_name + 5);
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if (ret) {
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krb5_rc_close(context, *id);
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*id = NULL;
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}
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return ret;
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}
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KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
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krb5_rc_default_name(krb5_context context)
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{
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return "FILE:/var/run/default_rcache";
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}
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KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
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krb5_rc_default_type(krb5_context context)
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{
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return "FILE";
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_rc_default(krb5_context context,
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krb5_rcache *id)
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{
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return krb5_rc_resolve_full(context, id, krb5_rc_default_name(context));
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}
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struct rc_entry{
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time_t stamp;
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unsigned char data[16];
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};
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_rc_initialize(krb5_context context,
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krb5_rcache id,
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krb5_deltat auth_lifespan)
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{
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FILE *f = fopen(id->name, "w");
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struct rc_entry tmp;
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int ret;
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if(f == NULL) {
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char buf[128];
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ret = errno;
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rk_strerror_r(ret, buf, sizeof(buf));
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krb5_set_error_message(context, ret, "open(%s): %s", id->name, buf);
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return ret;
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}
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memset(&tmp, 0, sizeof(tmp));
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tmp.stamp = auth_lifespan;
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fwrite(&tmp, 1, sizeof(tmp), f);
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fclose(f);
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return 0;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_rc_recover(krb5_context context,
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krb5_rcache id)
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{
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return 0;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_rc_destroy(krb5_context context,
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krb5_rcache id)
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{
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int ret;
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if(remove(id->name) < 0) {
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char buf[128];
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ret = errno;
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rk_strerror_r(ret, buf, sizeof(buf));
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krb5_set_error_message(context, ret, "remove(%s): %s", id->name, buf);
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return ret;
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}
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return krb5_rc_close(context, id);
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_rc_close(krb5_context context,
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krb5_rcache id)
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{
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free(id->name);
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free(id);
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return 0;
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}
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static void
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checksum_authenticator(Authenticator *auth, void *data)
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{
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EVP_MD_CTX *m = EVP_MD_CTX_create();
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unsigned i;
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EVP_DigestInit_ex(m, EVP_md5(), NULL);
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EVP_DigestUpdate(m, auth->crealm, strlen(auth->crealm));
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for(i = 0; i < auth->cname.name_string.len; i++)
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EVP_DigestUpdate(m, auth->cname.name_string.val[i],
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strlen(auth->cname.name_string.val[i]));
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EVP_DigestUpdate(m, &auth->ctime, sizeof(auth->ctime));
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EVP_DigestUpdate(m, &auth->cusec, sizeof(auth->cusec));
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EVP_DigestFinal_ex(m, data, NULL);
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EVP_MD_CTX_destroy(m);
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_rc_store(krb5_context context,
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krb5_rcache id,
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krb5_donot_replay *rep)
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{
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struct rc_entry ent, tmp;
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time_t t;
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FILE *f;
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int ret;
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size_t count;
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ent.stamp = time(NULL);
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checksum_authenticator(rep, ent.data);
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f = fopen(id->name, "r");
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if(f == NULL) {
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char buf[128];
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ret = errno;
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rk_strerror_r(ret, buf, sizeof(buf));
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krb5_set_error_message(context, ret, "open(%s): %s", id->name, buf);
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return ret;
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}
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rk_cloexec_file(f);
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count = fread(&tmp, sizeof(ent), 1, f);
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if(count != 1)
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return KRB5_RC_IO_UNKNOWN;
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t = ent.stamp - tmp.stamp;
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while(fread(&tmp, sizeof(ent), 1, f)){
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if(tmp.stamp < t)
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continue;
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if(memcmp(tmp.data, ent.data, sizeof(ent.data)) == 0){
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fclose(f);
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krb5_clear_error_message (context);
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return KRB5_RC_REPLAY;
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}
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}
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if(ferror(f)){
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char buf[128];
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ret = errno;
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fclose(f);
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rk_strerror_r(ret, buf, sizeof(buf));
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krb5_set_error_message(context, ret, "%s: %s",
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id->name, buf);
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return ret;
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}
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fclose(f);
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f = fopen(id->name, "a");
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if(f == NULL) {
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char buf[128];
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rk_strerror_r(errno, buf, sizeof(buf));
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krb5_set_error_message(context, KRB5_RC_IO_UNKNOWN,
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"open(%s): %s", id->name, buf);
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return KRB5_RC_IO_UNKNOWN;
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}
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fwrite(&ent, 1, sizeof(ent), f);
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fclose(f);
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return 0;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_rc_expunge(krb5_context context,
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krb5_rcache id)
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{
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return 0;
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_rc_get_lifespan(krb5_context context,
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krb5_rcache id,
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krb5_deltat *auth_lifespan)
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{
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FILE *f = fopen(id->name, "r");
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int r;
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struct rc_entry ent;
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r = fread(&ent, sizeof(ent), 1, f);
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fclose(f);
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if(r){
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*auth_lifespan = ent.stamp;
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return 0;
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}
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krb5_clear_error_message (context);
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return KRB5_RC_IO_UNKNOWN;
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}
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KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
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krb5_rc_get_name(krb5_context context,
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krb5_rcache id)
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{
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return id->name;
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}
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KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
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krb5_rc_get_type(krb5_context context,
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krb5_rcache id)
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{
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return "FILE";
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}
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_get_server_rcache(krb5_context context,
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const krb5_data *piece,
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krb5_rcache *id)
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{
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krb5_rcache rcache;
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krb5_error_code ret;
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char *tmp = malloc(4 * piece->length + 1);
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char *name;
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if (tmp == NULL)
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return krb5_enomem(context);
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strvisx(tmp, piece->data, piece->length, VIS_WHITE | VIS_OCTAL);
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#ifdef HAVE_GETEUID
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ret = asprintf(&name, "FILE:rc_%s_%u", tmp, (unsigned)geteuid());
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#else
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ret = asprintf(&name, "FILE:rc_%s", tmp);
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#endif
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free(tmp);
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if (ret < 0 || name == NULL)
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return krb5_enomem(context);
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ret = krb5_rc_resolve_full(context, &rcache, name);
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free(name);
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if(ret)
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return ret;
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*id = rcache;
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return ret;
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}
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