summaryrefslogtreecommitdiff
path: root/debian/patches-applied/027_pam_limits_better_init_allow_explicit_root
blob: 07e383ec31de1a6cb0bf69469ac3d42caa0c9a27 (plain)
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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
Allow explicit limits for root.
Also, remove limits on su.
Index: pam.deb/modules/pam_limits/pam_limits.c
===================================================================
--- pam.deb.orig/modules/pam_limits/pam_limits.c
+++ pam.deb/modules/pam_limits/pam_limits.c
@@ -45,6 +45,10 @@
 #include <libaudit.h>
 #endif
 
+#ifndef MLOCK_LIMIT
+#define MLOCK_LIMIT (64*1024)
+#endif
+
 /* Module defines */
 #define LINE_LENGTH 1024
 
@@ -74,6 +78,7 @@
 
 /* internal data */
 struct pam_limit_s {
+    int root;            /* running as root? */
     int login_limit;     /* the max logins limit */
     int login_limit_def; /* which entry set the login limit */
     int flag_numsyslogins; /* whether to limit logins only for a
@@ -295,9 +300,18 @@
 {
     int i;
     int retval = PAM_SUCCESS;
+    static int mlock_limit = 0;
 
     D(("called."));
 
+    pl->root = 0;
+
+    if (mlock_limit == 0) {
+	mlock_limit = sysconf(_SC_PAGESIZE);
+	if (mlock_limit < MLOCK_LIMIT)
+		mlock_limit = MLOCK_LIMIT;
+    }
+
     for(i = 0; i < RLIM_NLIMITS; i++) {
 	int r = getrlimit(i, &pl->limits[i].limit);
 	if (r == -1) {
@@ -307,8 +321,56 @@
 	    }
 	} else {
 	    pl->limits[i].supported = 1;
-	    pl->limits[i].src_soft = LIMITS_DEF_NONE;
-	    pl->limits[i].src_hard = LIMITS_DEF_NONE;
+	    pl->limits[i].src_soft = LIMITS_DEF_DEFAULT;
+	    pl->limits[i].src_hard = LIMITS_DEF_DEFAULT;
+	    switch(i) {
+		case RLIMIT_CPU:
+		case RLIMIT_FSIZE:
+		case RLIMIT_DATA:
+		case RLIMIT_RSS:
+		case RLIMIT_NPROC:
+#ifdef RLIMIT_AS
+		case RLIMIT_AS:
+#endif
+#ifdef RLIMIT_LOCKS
+		case RLIMIT_LOCKS:
+#endif
+		    pl->limits[i].limit.rlim_cur = RLIM_INFINITY;
+		    pl->limits[i].limit.rlim_max = RLIM_INFINITY;
+		    break;
+		case RLIMIT_MEMLOCK:
+		    pl->limits[i].limit.rlim_cur = mlock_limit;
+		    pl->limits[i].limit.rlim_max = mlock_limit;
+		    break;
+#ifdef RLIMIT_SIGPENDING
+		case RLIMIT_SIGPENDING:
+		    pl->limits[i].limit.rlim_cur = 16382;
+		    pl->limits[i].limit.rlim_max = 16382;
+		    break;
+#endif
+#ifdef RLIMIT_MSGQUEUE
+		case RLIMIT_MSGQUEUE:
+		    pl->limits[i].limit.rlim_cur = 819200;
+		    pl->limits[i].limit.rlim_max = 819200;
+		    break;
+#endif
+		case RLIMIT_CORE:
+		    pl->limits[i].limit.rlim_cur = 0;
+		    pl->limits[i].limit.rlim_max = RLIM_INFINITY;
+		    break;
+		case RLIMIT_STACK:
+		    pl->limits[i].limit.rlim_cur = 8192*1024;
+		    pl->limits[i].limit.rlim_max = RLIM_INFINITY;
+		    break;
+		case RLIMIT_NOFILE:
+		    pl->limits[i].limit.rlim_cur = 1024;
+		    pl->limits[i].limit.rlim_max = 1024;
+		    break;
+		default:
+		    pl->limits[i].src_soft = LIMITS_DEF_NONE;
+		    pl->limits[i].src_hard = LIMITS_DEF_NONE;
+		    break;
+	    }
 	}
     }
 
@@ -591,7 +653,7 @@
 
             if (strcmp(uname, domain) == 0) /* this user have a limit */
                 process_limit(pamh, LIMITS_DEF_USER, ltype, item, value, ctrl, pl);
-            else if (domain[0]=='@') {
+            else if (domain[0]=='@' && !pl->root) {
 		    if (ctrl & PAM_DEBUG_ARG) {
 			pam_syslog(pamh, LOG_DEBUG,
 				   "checking if %s is in group %s",
@@ -600,7 +662,7 @@
                 if (pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1))
                     process_limit(pamh, LIMITS_DEF_GROUP, ltype, item, value, ctrl,
 				  pl);
-            } else if (domain[0]=='%') {
+            } else if (domain[0]=='%' && !pl->root) {
 		    if (ctrl & PAM_DEBUG_ARG) {
 			pam_syslog(pamh, LOG_DEBUG,
 				   "checking if %s is in group %s",
@@ -614,7 +676,7 @@
                     process_limit(pamh, LIMITS_DEF_ALLGROUP, ltype, item, value, ctrl,
 				  pl);
 		}
-            } else if (strcmp(domain, "*") == 0)
+            } else if (strcmp(domain, "*") == 0 && !pl->root)
                 process_limit(pamh, LIMITS_DEF_DEFAULT, ltype, item, value, ctrl,
 			      pl);
 	} else if (i == 2 && ltype[0] == '-') { /* Probably a no-limit line */
@@ -649,6 +711,12 @@
     int status;
     int retval = LIMITED_OK;
 
+    if (uid == 0) {
+        /* do not impose +ve priority limits on the superuser */
+        if (pl->priority > 0)
+            pl->priority = 0;
+    }
+
     for (i=0, status=LIMITED_OK; i<RLIM_NLIMITS; i++) {
       int res;
 
@@ -749,6 +817,8 @@
         return PAM_ABORT;
     }
 
+    if (pwd->pw_uid == 0)
+        pl->root = 1;
     retval = parse_config_file(pamh, pwd->pw_name, ctrl, pl);
     if (retval == PAM_IGNORE) {
 	D(("the configuration file ('%s') has an applicable '<domain> -' entry", CONF_FILE));
Index: pam.deb/modules/pam_limits/limits.conf
===================================================================
--- pam.deb.orig/modules/pam_limits/limits.conf
+++ pam.deb/modules/pam_limits/limits.conf
@@ -11,6 +11,9 @@
 #        - the wildcard *, for default entry
 #        - the wildcard %, can be also used with %group syntax,
 #                 for maxlogin limit
+#        - NOTE: group and wildcard limits are not applied to root.
+#          To apply a limit to the root user, <domain> must be
+#          the literal username root.
 #
 #<type> can have the two values:
 #        - "soft" for enforcing the soft limits
@@ -41,6 +44,7 @@
 #
 
 #*               soft    core            0
+#root            hard    core            100000
 #*               hard    rss             10000
 #@student        hard    nproc           20
 #@faculty        soft    nproc           20
Index: pam.deb/modules/pam_limits/limits.conf.5.xml
===================================================================
--- pam.deb.orig/modules/pam_limits/limits.conf.5.xml
+++ pam.deb/modules/pam_limits/limits.conf.5.xml
@@ -57,6 +57,11 @@
               </para>
             </listitem>
           </itemizedlist>
+	  <para>
+	    <emphasis remap='B'>NOTE:</emphasis> group and wildcard limits are not
+	    applied to the root user.  To set a limit for the root user, this field
+	    must contain the literal username <emphasis remap='B'>root</emphasis>.
+	  </para>
         </listitem>
       </varlistentry>
 
@@ -278,6 +283,7 @@
     </para>
     <programlisting>
 *               soft    core            0
+root            hard    core            100000
 *               hard    rss             10000
 @student        hard    nproc           20
 @faculty        soft    nproc           20
Index: pam.deb/modules/pam_limits/limits.conf.5
===================================================================
--- pam.deb.orig/modules/pam_limits/limits.conf.5
+++ pam.deb/modules/pam_limits/limits.conf.5
@@ -84,6 +84,11 @@
 \fI%group\fR
 syntax\&.
 .RE
+.RS 4
+
+\fBNOTE:\fR
+group and wildcard limits are not applied to the root user\&. To set a limit for the root user, this field must contain the literal username
+\fBroot\fR\&.
 .RE
 .PP
 \fB<type>\fR
@@ -256,6 +261,7 @@
 .\}
 .nf
 *               soft    core            0
+root            hard    core            100000
 *               hard    rss             10000
 @student        hard    nproc           20
 @faculty        soft    nproc           20
Index: pam.deb/modules/pam_limits/README
===================================================================
--- pam.deb.orig/modules/pam_limits/README	2009-08-24 20:18:05 +0000
+++ pam.deb/modules/pam_limits/README	2009-08-26 00:32:41 +0000
@@ -55,6 +55,7 @@
 limits.conf.
 
 *               soft    core            0
+root            hard    core            100000
 *               hard    rss             10000
 @student        hard    nproc           20
 @faculty        soft    nproc           20