2 * Copyright (c) 2005 Thorsten Kukuk <kukuk@thkukuk.de>
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, and the entire permission notice in its entirety,
9 * including the disclaimer of warranties.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote
14 * products derived from this software without specific prior
17 * ALTERNATIVELY, this product may be distributed under the terms of
18 * the GNU Public License, in which case the provisions of the GPL are
19 * required INSTEAD OF the above restrictions. (This clause is
20 * necessary due to a potential bad interaction between the GPL and
21 * the restrictions contained in a BSD-style copyright.)
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
33 * OF THE POSSIBILITY OF SUCH DAMAGE.
47 #include <sys/types.h>
48 #include <sys/resource.h>
51 #define PAM_SM_SESSION
53 #include <security/pam_modules.h>
54 #include <security/_pam_modutil.h>
55 #include <security/pam_ext.h>
62 typedef struct options_t options_t;
65 parse_option (const pam_handle_t *pamh, const char *argv, options_t *options)
67 if (argv == NULL || argv[0] == '\0')
70 if (strcasecmp (argv, "debug") == 0)
72 else if (strncasecmp (argv, "umask=", 6) == 0)
73 options->umask = strdup (&argv[6]);
74 else if (strcasecmp (argv, "usergroups") == 0)
75 options->usergroups = 1;
77 pam_syslog (pamh, LOG_ERR, "Unknown option: `%s'", argv);
81 search_key (const char *filename)
88 fp = fopen (filename, "r");
95 #if defined(HAVE_GETLINE)
96 ssize_t n = getline (&buf, &buflen, fp);
97 #elif defined (HAVE_GETDELIM)
98 ssize_t n = getdelim (&buf, &buflen, '\n', fp);
105 buf = malloc (buflen);
108 fgets (buf, buflen - 1, fp);
113 #endif /* HAVE_GETLINE / HAVE_GETDELIM */
119 tmp = strchr (cp, '#'); /* remove comments */
122 while (isspace ((int)*cp)) /* remove spaces and tabs */
124 if (*cp == '\0') /* ignore empty lines */
127 if (cp[strlen (cp) - 1] == '\n')
128 cp[strlen (cp) - 1] = '\0';
130 tmp = strsep (&cp, " \t=");
132 while (isspace ((int)*cp) || *cp == '=')
135 if (strcasecmp (tmp, "UMASK") == 0)
137 retval = strdup (cp);
150 get_options (const pam_handle_t *pamh, options_t *options,
151 int argc, const char **argv)
153 memset (options, 0, sizeof (options_t));
154 /* Parse parameters for module */
155 for ( ; argc-- > 0; argv++)
156 parse_option (pamh, *argv, options);
158 if (options->umask == NULL)
159 options->umask = search_key ("/etc/login.defs");
160 if (options->umask == NULL)
161 options->umask = search_key ("/etc/default/login");
167 set_umask (const char *value)
169 const char *value_orig = value;
173 mask = strtol (value, &endptr, 8) & 0777;
174 if ((mask == 0) && (value_orig == endptr))
180 /* Set the process nice, ulimit, and umask from the
181 password file entry. */
183 setup_limits_from_gecos (pam_handle_t *pamh, options_t *options,
188 if (options->usergroups)
190 /* if not root, and UID == GID, and username is the same as
191 primary group name, set umask group bits to be the same as
192 owner bits (examples: 022 -> 002, 077 -> 007). */
193 if (pw->pw_uid != 0 && pw->pw_uid == pw->pw_gid)
195 struct group *grp = _pammodutil_getgrgid (pamh, pw->pw_gid);
196 if (grp && (strcmp (pw->pw_name, grp->gr_name) == 0))
198 mode_t oldmask = umask (0777);
199 umask ((oldmask & ~070) | ((oldmask >> 3) & 070));
204 /* See if the GECOS field contains values for NICE, UMASK or ULIMIT. */
205 for (cp = pw->pw_gecos; cp != NULL; cp = strchr (cp, ','))
210 if (strncasecmp (cp, "umask=", 6) == 0)
211 umask (strtol (cp + 6, NULL, 8) & 0777);
212 else if (strncasecmp (cp, "pri=", 4) == 0)
213 nice (strtol (cp + 4, NULL, 10));
214 else if (strncasecmp (cp, "ulimit=", 7) == 0)
216 struct rlimit rlimit_fsize;
217 rlimit_fsize.rlim_cur = 512L * strtol (cp + 7, NULL, 10);
218 rlimit_fsize.rlim_max = rlimit_fsize.rlim_cur;
219 setrlimit (RLIMIT_FSIZE, &rlimit_fsize);
226 pam_sm_open_session (pam_handle_t *pamh, int flags UNUSED,
227 int argc, const char **argv)
232 int retval = PAM_SUCCESS;
234 get_options (pamh, &options, argc, argv);
236 /* get the user name. */
237 if ((retval = pam_get_user (pamh, &name, NULL)) != PAM_SUCCESS)
239 pam_syslog (pamh, LOG_ERR, "pam_get_user failed: return %d", retval);
240 return (retval == PAM_CONV_AGAIN ? PAM_INCOMPLETE:retval);
243 if (name == NULL || name[0] == '\0')
247 pam_syslog (pamh, LOG_ERR, "bad username [%s]", name);
248 return PAM_USER_UNKNOWN;
250 return PAM_SERVICE_ERR;
253 pw = _pammodutil_getpwnam (pamh, name);
256 pam_syslog (pamh, LOG_ERR, "account for %s not found", name);
257 return PAM_USER_UNKNOWN;
260 if (options.umask != NULL)
262 set_umask (options.umask);
263 free (options.umask);
266 setup_limits_from_gecos (pamh, &options, pw);
272 pam_sm_close_session (pam_handle_t *pamh UNUSED, int flags UNUSED,
273 int argc UNUSED, const char **argv UNUSED)
280 /* static module data */
282 struct pam_module _pam_umask_modstruct = {
288 pam_sm_close_session,
294 /* end of module definition */