1 /*
2 * Copyright 2000-2022 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <openssl/opensslconf.h>
11
12 #include <openssl/crypto.h>
13 #include <openssl/e_os2.h>
14 #include <openssl/rand.h>
15
16 /*
17 * Query an EGD
18 */
19
20 #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_VOS) || defined(OPENSSL_SYS_UEFI)
RAND_query_egd_bytes(const char * path,unsigned char * buf,int bytes)21 int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
22 {
23 return -1;
24 }
25
RAND_egd(const char * path)26 int RAND_egd(const char *path)
27 {
28 return -1;
29 }
30
RAND_egd_bytes(const char * path,int bytes)31 int RAND_egd_bytes(const char *path, int bytes)
32 {
33 return -1;
34 }
35
36 #else
37
38 # include <unistd.h>
39 # include <stddef.h>
40 # include <sys/types.h>
41 # include <sys/socket.h>
42 # ifndef NO_SYS_UN_H
43 # include <sys/un.h>
44 # else
45 struct sockaddr_un {
46 short sun_family; /* AF_UNIX */
47 char sun_path[108]; /* path name (gag) */
48 };
49 # endif /* NO_SYS_UN_H */
50 # include <string.h>
51 # include <errno.h>
52
53 # if defined(OPENSSL_SYS_TANDEM)
54 /*
55 * HPNS:
56 *
57 * This code forces the use of compatibility mode if required on HPE NonStop
58 * when coreutils PRNGD is used and then restores the previous mode
59 * after establishing the socket. This is not required on x86 where hardware
60 * randomization should be used instead of EGD available as of OpenSSL 3.0.
61 * Use --with-rand-seed=rdcpu when configuring x86 with 3.0 and above.
62 *
63 * Needs review:
64 *
65 * The better long-term solution is to either run two EGD's each in one of
66 * the two modes or revise the EGD code to listen on two different sockets
67 * (each in one of the two modes) or use the hardware randomizer.
68 */
69 _variable
hpns_socket(int family,int type,int protocol,char * transport)70 int hpns_socket(int family,
71 int type,
72 int protocol,
73 char* transport)
74 {
75 int socket_rc;
76 char current_transport[20];
77
78 # define AF_UNIX_PORTABILITY "$ZAFN2"
79 # define AF_UNIX_COMPATIBILITY "$ZPLS"
80
81 if (!_arg_present(transport) || transport == NULL || transport[0] == '\0')
82 return socket(family, type, protocol);
83
84 socket_transport_name_get(AF_UNIX, current_transport, 20);
85
86 if (strcmp(current_transport, transport) == 0)
87 return socket(family, type, protocol);
88
89 /* set the requested socket transport */
90 if (socket_transport_name_set(AF_UNIX, transport))
91 return -1;
92
93 socket_rc = socket(family, type, protocol);
94
95 /* set mode back to what it was */
96 if (socket_transport_name_set(AF_UNIX, current_transport))
97 return -1;
98
99 return socket_rc;
100 }
101
102 /*#define socket(a,b,c,...) hpns_socket(a,b,c,__VA_ARGS__) */
103
104 static int hpns_connect_attempt = 0;
105
106 # endif /* defined(OPENSSL_SYS_HPNS) */
107
108
RAND_query_egd_bytes(const char * path,unsigned char * buf,int bytes)109 int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
110 {
111 FILE *fp = NULL;
112 struct sockaddr_un addr;
113 int mybuffer, ret = -1, i, numbytes, fd;
114 unsigned char tempbuf[255];
115
116 if (bytes > (int)sizeof(tempbuf))
117 return -1;
118
119 /* Make socket. */
120 memset(&addr, 0, sizeof(addr));
121 addr.sun_family = AF_UNIX;
122 if (strlen(path) >= sizeof(addr.sun_path))
123 return -1;
124 strcpy(addr.sun_path, path);
125 i = offsetof(struct sockaddr_un, sun_path) + strlen(path);
126 #if defined(OPENSSL_SYS_TANDEM)
127 fd = hpns_socket(AF_UNIX, SOCK_STREAM, 0, AF_UNIX_COMPATIBILITY);
128 #else
129 fd = socket(AF_UNIX, SOCK_STREAM, 0);
130 #endif
131 if (fd == -1 || (fp = fdopen(fd, "r+")) == NULL)
132 return -1;
133 setbuf(fp, NULL);
134
135 /* Try to connect */
136 for (;;) {
137 if (connect(fd, (struct sockaddr *)&addr, i) == 0)
138 break;
139 # ifdef EISCONN
140 if (errno == EISCONN)
141 break;
142 # endif
143 switch (errno) {
144 # ifdef EINTR
145 case EINTR:
146 # endif
147 # ifdef EAGAIN
148 case EAGAIN:
149 # endif
150 # ifdef EINPROGRESS
151 case EINPROGRESS:
152 # endif
153 # ifdef EALREADY
154 case EALREADY:
155 # endif
156 /* No error, try again */
157 break;
158 default:
159 # if defined(OPENSSL_SYS_TANDEM)
160 if (hpns_connect_attempt == 0) {
161 /* try the other kind of AF_UNIX socket */
162 close(fd);
163 fd = hpns_socket(AF_UNIX, SOCK_STREAM, 0, AF_UNIX_PORTABILITY);
164 if (fd == -1)
165 return -1;
166 ++hpns_connect_attempt;
167 break; /* try the connect again */
168 }
169 # endif
170
171 ret = -1;
172 goto err;
173 }
174 }
175
176 /* Make request, see how many bytes we can get back. */
177 tempbuf[0] = 1;
178 tempbuf[1] = bytes;
179 if (fwrite(tempbuf, sizeof(char), 2, fp) != 2 || fflush(fp) == EOF)
180 goto err;
181 if (fread(tempbuf, sizeof(char), 1, fp) != 1 || tempbuf[0] == 0)
182 goto err;
183 numbytes = tempbuf[0];
184
185 /* Which buffer are we using? */
186 mybuffer = buf == NULL;
187 if (mybuffer)
188 buf = tempbuf;
189
190 /* Read bytes. */
191 i = fread(buf, sizeof(char), numbytes, fp);
192 if (i < numbytes)
193 goto err;
194 ret = numbytes;
195 if (mybuffer)
196 RAND_add(tempbuf, i, i);
197
198 err:
199 if (fp != NULL)
200 fclose(fp);
201 return ret;
202 }
203
RAND_egd_bytes(const char * path,int bytes)204 int RAND_egd_bytes(const char *path, int bytes)
205 {
206 int num;
207
208 num = RAND_query_egd_bytes(path, NULL, bytes);
209 if (num < 0)
210 return -1;
211 if (RAND_status() != 1)
212 return -1;
213 return num;
214 }
215
RAND_egd(const char * path)216 int RAND_egd(const char *path)
217 {
218 return RAND_egd_bytes(path, 255);
219 }
220
221 #endif
222
