diff options
Diffstat (limited to 'modules/pam_motd/pam_motd.c')
| -rw-r--r-- | modules/pam_motd/pam_motd.c | 49 |
1 files changed, 40 insertions, 9 deletions
diff --git a/modules/pam_motd/pam_motd.c b/modules/pam_motd/pam_motd.c index 6ac8cba2..5ca486e4 100644 --- a/modules/pam_motd/pam_motd.c +++ b/modules/pam_motd/pam_motd.c @@ -166,11 +166,6 @@ static int compare_strings(const void *a, const void *b) } } -static int filter_dirents(const struct dirent *d) -{ - return (d->d_type == DT_REG || d->d_type == DT_LNK); -} - static void try_to_display_directories_with_overrides(pam_handle_t *pamh, char **motd_dir_path_split, unsigned int num_motd_dirs, int report_missing) { @@ -199,8 +194,7 @@ static void try_to_display_directories_with_overrides(pam_handle_t *pamh, for (i = 0; i < num_motd_dirs; i++) { int rv; - rv = scandir(motd_dir_path_split[i], &(dirscans[i]), - filter_dirents, alphasort); + rv = scandir(motd_dir_path_split[i], &(dirscans[i]), NULL, NULL); if (rv < 0) { if (errno != ENOENT || report_missing) { pam_syslog(pamh, LOG_ERR, "error scanning directory %s: %m", @@ -215,6 +209,41 @@ static void try_to_display_directories_with_overrides(pam_handle_t *pamh, if (dirscans_size_total == 0) goto out; + /* filter out unwanted names, directories, and complement data with lstat() */ + for (i = 0; i < num_motd_dirs; i++) { + struct dirent **d = dirscans[i]; + for (unsigned int j = 0; j < dirscans_sizes[i]; j++) { + int rc; + char *fullpath; + struct stat s; + + switch(d[j]->d_type) { /* the filetype determines how to proceed */ + case DT_REG: /* regular files and */ + case DT_LNK: /* symlinks */ + continue; /* are good. */ + case DT_UNKNOWN: /* for file systems that do not provide */ + /* a filetype, we use lstat() */ + if (join_dir_strings(&fullpath, motd_dir_path_split[i], + d[j]->d_name) <= 0) + break; + rc = lstat(fullpath, &s); + _pam_drop(fullpath); /* free the memory alloc'ed by join_dir_strings */ + if (rc != 0) /* if the lstat() somehow failed */ + break; + + if (S_ISREG(s.st_mode) || /* regular files and */ + S_ISLNK(s.st_mode)) continue; /* symlinks are good */ + break; + case DT_DIR: /* We don't want directories */ + default: /* nor anything else */ + break; + } + _pam_drop(d[j]); /* free memory */ + d[j] = NULL; /* indicate this one was dropped */ + dirscans_size_total--; + } + } + /* Allocate space for all file names found in the directories, including duplicates. */ if ((dirnames_all = calloc(dirscans_size_total, sizeof(*dirnames_all))) == NULL) { pam_syslog(pamh, LOG_CRIT, "failed to allocate dirname array"); @@ -225,8 +254,10 @@ static void try_to_display_directories_with_overrides(pam_handle_t *pamh, unsigned int j; for (j = 0; j < dirscans_sizes[i]; j++) { - dirnames_all[i_dirnames] = dirscans[i][j]->d_name; - i_dirnames++; + if (NULL != dirscans[i][j]) { + dirnames_all[i_dirnames] = dirscans[i][j]->d_name; + i_dirnames++; + } } } |