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Include getpwent() version of sudo_getgrouplist2_v1() from getgrouplist.c

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This commit is contained in:
Todd C. Miller 2018-10-27 12:10:43 -06:00
parent 0398996b39
commit 03c56db408
1 changed files with 80 additions and 0 deletions
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80
plugins/sudoers/tsgetgrpw.c
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@ -40,6 +40,7 @@
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <unistd.h>
#include "tsgetgrpw.h"
#include "sudoers.h"
@ -331,3 +332,82 @@ getgrgid(gid_t gid)
}
return gr;
}
/*
* Copied from getgrouplist.c
*/
int
sudo_getgrouplist2_v1(const char *name, GETGROUPS_T basegid,
GETGROUPS_T **groupsp, int *ngroupsp)
{
GETGROUPS_T *groups = *groupsp;
int grpsize = *ngroupsp;
int i, ngroups = 1;
int ret = -1;
struct group *grp;
if (groups == NULL) {
/* Dynamically-sized group vector. */
grpsize = (int)sysconf(_SC_NGROUPS_MAX);
if (grpsize < 0)
grpsize = NGROUPS_MAX;
groups = reallocarray(NULL, grpsize, 4 * sizeof(*groups));
if (groups == NULL)
return -1;
grpsize <<= 2;
} else {
/* Static group vector. */
if (grpsize < 1)
return -1;
}
/* We support BSD semantics where the first element is the base gid */
groups[0] = basegid;
setgrent();
while ((grp = getgrent()) != NULL) {
if (grp->gr_gid == basegid || grp->gr_mem == NULL)
continue;
for (i = 0; grp->gr_mem[i] != NULL; i++) {
if (strcmp(name, grp->gr_mem[i]) == 0)
break;
}
if (grp->gr_mem[i] == NULL)
continue; /* user not found */
/* Only add if it is not the same as an existing gid */
for (i = 0; i < ngroups; i++) {
if (grp->gr_gid == groups[i])
break;
}
if (i == ngroups) {
if (ngroups == grpsize) {
GETGROUPS_T *tmp;
if (*groupsp != NULL) {
/* Static group vector. */
goto done;
}
tmp = reallocarray(groups, grpsize, 2 * sizeof(*groups));
if (tmp == NULL) {
free(groups);
groups = NULL;
ngroups = 0;
goto done;
}
groups = tmp;
grpsize <<= 1;
}
groups[ngroups++] = grp->gr_gid;
}
}
ret = 0;
done:
endgrent();
*groupsp = groups;
*ngroupsp = ngroups;
return ret;
}