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
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
|
/* Copyright (C) 2011,2015 the GSS-PROXY contributors, see COPYING for license */
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <locale.h>
#include <signal.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <pwd.h>
#include <grp.h>
#include "gp_proxy.h"
void init_server(bool daemonize, int *wait_fd)
{
pid_t pid, sid;
int ret;
*wait_fd = -1;
if (daemonize) {
int pipefd[2];
char buf[1];
/* create parent-child pipe */
ret = pipe(pipefd);
if (ret == -1) {
exit(EXIT_FAILURE);
}
pid = fork();
if (pid == -1) {
/* fork error ? abort */
exit(EXIT_FAILURE);
}
if (pid != 0) {
/* wait for child to signal it is ready */
close(pipefd[1]);
ret = gp_safe_read(pipefd[0], buf, 1);
if (ret == 1) {
/* child signaled all ok */
exit(EXIT_SUCCESS);
} else {
/* lost child, something went wrong */
exit(EXIT_FAILURE);
}
}
/* child */
close(pipefd[0]);
*wait_fd = pipefd[1];
sid = setsid();
if (sid == -1) {
/* setsid error ? abort */
exit(EXIT_FAILURE);
}
}
ret = chdir("/");
if (ret == -1) {
exit(EXIT_FAILURE);
}
/* Set strict umask by default */
umask(0177);
/* Set up neutral locale */
setlocale(LC_ALL, "");
/* Set env var to avoid looping to ourselves in GSSAPI */
setenv("GSS_USE_PROXY", "NO", 1);
gp_logging_init();
}
void init_done(int wait_fd)
{
char buf = 0;
int ret;
if (wait_fd != -1) {
ret = gp_safe_write(wait_fd, &buf, 1);
if (ret != 1) {
exit(EXIT_FAILURE);
}
close(wait_fd);
}
}
void fini_server(void)
{
closelog();
}
static void break_loop(verto_ctx *vctx, verto_ev *ev)
{
GPDEBUG("Exiting after receiving a signal\n");
verto_break(vctx);
}
verto_ctx *init_event_loop(void)
{
verto_ctx *vctx;
verto_ev *ev;
vctx = verto_default(NULL,
VERTO_EV_TYPE_IO |
VERTO_EV_TYPE_SIGNAL |
VERTO_EV_TYPE_TIMEOUT);
if (!vctx) {
return NULL;
}
ev = verto_add_signal(vctx, VERTO_EV_FLAG_PERSIST, break_loop, SIGINT);
if (!ev) {
verto_free(vctx);
return NULL;
}
ev = verto_add_signal(vctx, VERTO_EV_FLAG_PERSIST, break_loop, SIGTERM);
if (!ev) {
verto_free(vctx);
return NULL;
}
ev = verto_add_signal(vctx, VERTO_EV_FLAG_PERSIST, break_loop, SIGQUIT);
if (!ev) {
verto_free(vctx);
return NULL;
}
ev = verto_add_signal(vctx, VERTO_EV_FLAG_PERSIST, VERTO_SIG_IGN, SIGPIPE);
if (!ev) {
verto_free(vctx);
return NULL;
}
/* SIGHUP handler added in main */
return vctx;
}
void init_proc_nfsd(struct gp_config *cfg)
{
char buf[] = "1";
bool enabled = false;
int fd, i, ret;
/* check first if any service enabled kernel support */
for (i = 0; i < cfg->num_svcs; i++) {
if (cfg->svcs[i]->kernel_nfsd == true) {
enabled = true;
break;
}
}
if (!enabled) {
return;
}
fd = open(LINUX_PROC_USE_GSS_PROXY_FILE, O_RDWR);
if (fd == -1) {
ret = errno;
fprintf(stderr, "GSS-Proxy is not supported by this kernel since "
"file %s could not be found: %d (%s)\n",
LINUX_PROC_USE_GSS_PROXY_FILE,
ret, gp_strerror(ret));
exit(1);
}
ret = write(fd, buf, 1);
if (ret != 1) {
ret = errno;
fprintf(stderr, "Failed to write to %s: %d (%s)\n",
LINUX_PROC_USE_GSS_PROXY_FILE,
ret, gp_strerror(ret));
exit(1);
}
ret = close(fd);
if (ret == -1) {
ret = errno;
fprintf(stderr, "Failed to close %s: %d (%s)\n",
LINUX_PROC_USE_GSS_PROXY_FILE,
ret, gp_strerror(ret));
exit(1);
}
}
void write_pid(void)
{
pid_t pid;
FILE *f;
int ret;
pid = getpid();
f = fopen(GP_PID_FILE, "w");
if (!f) {
ret = errno;
GPDEBUG("Failed to open %s: %d (%s)\n",
GP_PID_FILE, ret, gp_strerror(ret));
return;
}
ret = fprintf(f, "%d\n", pid);
if (ret <= 0) {
GPDEBUG("Failed to write pid to %s\n", GP_PID_FILE);
}
ret = fclose(f);
if (ret != 0) {
ret = errno;
GPDEBUG("Failed to close %s: %d (%s)\n",
GP_PID_FILE, ret, gp_strerror(ret));
}
}
int drop_privs(struct gp_config *cfg)
{
char buf[2048];
struct passwd *pw, pws;
int ret;
if (cfg->proxy_user == NULL) {
/* not dropping privs */
return 0;
}
ret = getpwnam_r(cfg->proxy_user, &pws, buf, 2048, &pw);
if (ret) {
GPDEBUG("Failed to look up proxy user: '%s'! [%d:%s]\n",
cfg->proxy_user, ret, gp_strerror(ret));
return ret;
}
ret = initgroups(pw->pw_name, pw->pw_gid);
if (ret) {
GPDEBUG("Failed to set access credentials: [%d:%s]\n",
ret, gp_strerror(ret));
return ret;
}
ret = setgid(pw->pw_gid);
if (ret == -1) {
ret = errno;
GPDEBUG("Failed to set group id to %d: [%d:%s]\n",
pw->pw_gid, ret, gp_strerror(ret));
return ret;
}
ret = setuid(pw->pw_uid);
if (ret == -1) {
ret = errno;
GPDEBUG("Failed to set user id to %d: [%d:%s]\n",
pw->pw_uid, ret, gp_strerror(ret));
return ret;
}
return 0;
}
|
