1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/*
* $Id: modutil_getpwuid.c,v 1.1.1.1 2002/09/15 20:09:04 hartmans Exp $
*
* This function provides a thread safer version of getpwuid() for use
* with PAM modules that care about this sort of thing.
*
* XXX - or at least it should provide a thread-safe alternative.
*/
#include "pammodutil.h"
#include <pwd.h>
#include <stdlib.h>
struct passwd *_pammodutil_getpwuid(pam_handle_t *pamh, uid_t uid)
{
#ifdef HAVE_GETPWNAM_R
void *buffer=NULL;
size_t length = PWD_INITIAL_LENGTH;
do {
int status;
void *new_buffer;
struct passwd *result = NULL;
new_buffer = realloc(buffer, sizeof(struct passwd) + length);
if (new_buffer == NULL) {
D(("out of memory"));
/* no memory for the user - so delete the memory */
if (buffer) {
free(buffer);
}
return NULL;
}
buffer = new_buffer;
/* make the re-entrant call to get the pwd structure */
status = getpwuid_r(uid, buffer,
sizeof(struct passwd) + (char *) buffer,
length, &result);
if (!status && result) {
status = pam_set_data(pamh, "_pammodutil_getpwuid", result,
_pammodutil_cleanup);
if (status == PAM_SUCCESS) {
D(("success"));
return result;
}
D(("was unable to register the data item [%s]",
pam_strerror(pamh, status)));
free(buffer);
return NULL;
}
length <<= 1;
} while (length < PWD_ABSURD_PWD_LENGTH);
D(("pwd structure took %u bytes or so of memory",
length+sizeof(struct passwd)));
free(buffer);
return NULL;
#else /* ie. ifndef HAVE_GETPWNAM_R */
/*
* Sorry, there does not appear to be a reentrant version of
* getpwnam(). So, we use the standard libc function.
*/
return getpwuid(uid);
#endif /* def HAVE_GETPWNAM_R */
}
|
