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Fix the getpwuid_r() call in the gssd daemon so that it handles

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the ERANGE error return case. Without this fix, authentication
of users for certain system setups could fail unexpectedly.

Reported by:	Elias Martenson (lokedhs@gmail.com)
Tested by:	Elias Martenson (earlier version)
MFC after:	2 weeks
This commit is contained in:
Rick Macklem 2013-05-02 12:43:56 +00:00
parent f5efbffe52
commit d1e9aa46c5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=250176
1 changed files with 25 additions and 2 deletions
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27
usr.sbin/gssd/gssd.c
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@ -37,6 +37,7 @@ __FBSDID("$FreeBSD$");
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#ifndef WITHOUT_KERBEROS
#include <krb5.h>
#endif
@ -557,8 +558,11 @@ gssd_pname_to_uid_1_svc(pname_to_uid_args *argp, pname_to_uid_res *result, struc
{
gss_name_t name = gssd_find_resource(argp->pname);
uid_t uid;
char buf[128];
char buf[1024], *bufp;
struct passwd pwd, *pw;
size_t buflen;
int error;
static size_t buflen_hint = 1024;
memset(result, 0, sizeof(*result));
if (name) {
@ -567,7 +571,24 @@ gssd_pname_to_uid_1_svc(pname_to_uid_args *argp, pname_to_uid_res *result, struc
name, argp->mech, &uid);
if (result->major_status == GSS_S_COMPLETE) {
result->uid = uid;
getpwuid_r(uid, &pwd, buf, sizeof(buf), &pw);
buflen = buflen_hint;
for (;;) {
pw = NULL;
bufp = buf;
if (buflen > sizeof(buf))
bufp = malloc(buflen);
if (bufp == NULL)
break;
error = getpwuid_r(uid, &pwd, bufp, buflen,
&pw);
if (error != ERANGE)
break;
if (buflen > sizeof(buf))
free(bufp);
buflen += 1024;
if (buflen > buflen_hint)
buflen_hint = buflen;
}
if (pw) {
int len = NGRPS;
int groups[NGRPS];
@ -584,6 +605,8 @@ gssd_pname_to_uid_1_svc(pname_to_uid_args *argp, pname_to_uid_res *result, struc
result->gidlist.gidlist_len = 0;
result->gidlist.gidlist_val = NULL;
}
if (bufp != NULL && buflen > sizeof(buf))
free(bufp);
}
} else {
result->major_status = GSS_S_BAD_NAME;