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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:01:37 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:01:37 +0000 |
commit | de848d9e9146434817c65d74d1d0313e9d729462 (patch) | |
tree | dcbd0efb229b17f696f7195671f05b354b4f70fc /libpam/pam_modutil_getgrnam.c | |
parent | Initial commit. (diff) | |
download | pam-de848d9e9146434817c65d74d1d0313e9d729462.tar.xz pam-de848d9e9146434817c65d74d1d0313e9d729462.zip |
Adding upstream version 1.4.0.upstream/1.4.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | libpam/pam_modutil_getgrnam.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/libpam/pam_modutil_getgrnam.c b/libpam/pam_modutil_getgrnam.c new file mode 100644 index 0000000..cbb1551 --- /dev/null +++ b/libpam/pam_modutil_getgrnam.c @@ -0,0 +1,127 @@ +/* + * $Id$ + * + * This function provides a thread safer version of getgrnam() for use + * with PAM modules that care about this sort of thing. + * + * XXX - or at least it should provide a thread-safe alternative. + */ + +#include "pam_modutil_private.h" + +#include <errno.h> +#include <limits.h> +#include <grp.h> +#include <stdio.h> +#include <stdlib.h> + +static int intlen(int number) +{ + int len = 2; + while (number != 0) { + number /= 10; + len++; + } + return len; +} + +struct group * +pam_modutil_getgrnam(pam_handle_t *pamh, const char *group) +{ +#ifdef HAVE_GETGRNAM_R + + void *buffer=NULL; + size_t length = PWD_INITIAL_LENGTH; + + do { + int status; + void *new_buffer; + struct group *result = NULL; + + new_buffer = realloc(buffer, sizeof(struct group) + length); + if (new_buffer == NULL) { + + D(("out of memory")); + + /* no memory for the group - so delete the memory */ + if (buffer) { + free(buffer); + } + return NULL; + } + buffer = new_buffer; + + /* make the re-entrant call to get the grp structure */ + errno = 0; + status = getgrnam_r(group, buffer, + sizeof(struct group) + (char *) buffer, + length, &result); + if (!status && (result == buffer)) { + char *data_name; + const void *ignore; + int i; + + data_name = malloc(strlen("_pammodutil_getgrnam") + 1 + + strlen(group) + 1 + intlen(INT_MAX) + 1); + if ((pamh != NULL) && (data_name == NULL)) { + D(("was unable to register the data item [%s]", + pam_strerror(pamh, status))); + free(buffer); + return NULL; + } + + if (pamh != NULL) { + for (i = 0; i < INT_MAX; i++) { + sprintf(data_name, "_pammodutil_getgrnam_%s_%d", group, i); + status = PAM_NO_MODULE_DATA; + if (pam_get_data(pamh, data_name, &ignore) != PAM_SUCCESS) { + status = pam_set_data(pamh, data_name, + result, pam_modutil_cleanup); + } + if (status == PAM_SUCCESS) { + break; + } + } + } else { + status = PAM_SUCCESS; + } + + free(data_name); + + 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; + + } else if (errno != ERANGE && errno != EINTR) { + /* no sense in repeating the call */ + break; + } + + length <<= PWD_LENGTH_SHIFT; + + } while (length < PWD_ABSURD_PWD_LENGTH); + + D(("grp structure took %u bytes or so of memory", + length+sizeof(struct group))); + + free(buffer); + return NULL; + +#else /* ie. ifndef HAVE_GETGRNAM_R */ + + /* + * Sorry, there does not appear to be a reentrant version of + * getgrnam(). So, we use the standard libc function. + */ + + return getgrnam(group); + +#endif /* def HAVE_GETGRNAM_R */ +} |