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Date:: Sun Oct 23 00:37:19 2022 UTC
Message:: introduce gotd(8), a Git repository server reachable via ssh(1) This is an initial barebones implementation which provides the absolute minimum of functionality required to serve got(1) and git(1) clients. Basic fetch/send functionality has been tested and seems to work here, but this server is not yet expected to be stable. More testing is welcome. See the man pages for setup instructions. The current design uses one reader and one writer process per repository, which will have to be extended to N readers and N writers in the future. At startup, each process will chroot(2) into its assigned repository. This works because gotd(8) can only be started as root, and will then fork+exec, chroot, and privdrop. At present the parent process runs with the following pledge(2) promises: "stdio rpath wpath cpath proc getpw sendfd recvfd fattr flock unix unveil" The parent is the only process able to modify the repository in a way that becomes visible to Git clients. The parent uses unveil(2) to restrict its view of the filesystem to /tmp and the repositories listed in the configuration file gotd.conf(5). Per-repository chroot(2) processes use "stdio rpath sendfd recvfd". The writer defers to the parent for modifying references in the repository to point at newly uploaded commits. The reader is fine without such help, because Git repositories can be read without having to create any lock-files. gotd(8) requires a dedicated user ID, which should own repositories on the filesystem, and a separate secondary group, which should not have filesystem-level repository access, and must be allowed access to the gotd(8) socket. To obtain Git repository access, users must be members of this secondary group, and must have their login shell set to gotsh(1). gotsh(1) connects to the gotd(8) socket and speaks Git-protocol towards the client on the other end of the SSH connection. gotsh(1) is not an interactive command shell. At present, authenticated clients are granted read/write access to all repositories and all references (except for the "refs/got/" and the "refs/remotes/" namespaces, which are already being protected from modification). While complicated access control mechanism are not a design goal, making it possible to safely offer anonymous Git repository access over ssh(1) is on the road map.
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  1 74b37681 2019-02-07 stsp /*	$OpenBSD: buf.c,v 1.27 2016/10/16 13:35:51 okan Exp $	*/
  2 74b37681 2019-02-07 stsp /*
  3 74b37681 2019-02-07 stsp  * Copyright (c) 2003 Jean-Francois Brousseau <jfb@openbsd.org>
  4 74b37681 2019-02-07 stsp  * All rights reserved.
  5 74b37681 2019-02-07 stsp  *
  6 74b37681 2019-02-07 stsp  * Redistribution and use in source and binary forms, with or without
  7 74b37681 2019-02-07 stsp  * modification, are permitted provided that the following conditions
  8 74b37681 2019-02-07 stsp  * are met:
  9 74b37681 2019-02-07 stsp  *
 10 74b37681 2019-02-07 stsp  * 1. Redistributions of source code must retain the above copyright
 11 74b37681 2019-02-07 stsp  *    notice, this list of conditions and the following disclaimer.
 12 74b37681 2019-02-07 stsp  * 2. The name of the author may not be used to endorse or promote products
 13 74b37681 2019-02-07 stsp  *    derived from this software without specific prior written permission.
 14 74b37681 2019-02-07 stsp  *
 15 74b37681 2019-02-07 stsp  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 16 74b37681 2019-02-07 stsp  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 17 74b37681 2019-02-07 stsp  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 18 74b37681 2019-02-07 stsp  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 19 74b37681 2019-02-07 stsp  * EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 20 74b37681 2019-02-07 stsp  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 21 74b37681 2019-02-07 stsp  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 22 74b37681 2019-02-07 stsp  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 23 74b37681 2019-02-07 stsp  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 24 74b37681 2019-02-07 stsp  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 25 74b37681 2019-02-07 stsp  */
 26 74b37681 2019-02-07 stsp 
 27 74b37681 2019-02-07 stsp #include <sys/queue.h>
 28 74b37681 2019-02-07 stsp #include <sys/stat.h>
 29 74b37681 2019-02-07 stsp 
 30 74b37681 2019-02-07 stsp #include <errno.h>
 31 74b37681 2019-02-07 stsp #include <fcntl.h>
 32 74b37681 2019-02-07 stsp #include <stdint.h>
 33 74b37681 2019-02-07 stsp #include <stdio.h>
 34 74b37681 2019-02-07 stsp #include <stdlib.h>
 35 74b37681 2019-02-07 stsp #include <string.h>
 36 74b37681 2019-02-07 stsp #include <unistd.h>
 37 74b37681 2019-02-07 stsp 
 38 74b37681 2019-02-07 stsp #include "buf.h"
 39 74b37681 2019-02-07 stsp 
 40 af45e626 2019-02-08 stsp #include "got_error.h"
 41 af45e626 2019-02-08 stsp 
 42 74b37681 2019-02-07 stsp #define BUF_INCR	128
 43 74b37681 2019-02-07 stsp 
 44 575e8218 2019-10-07 stsp #define SIZE_LEFT(b)	((b)->cb_size - (b)->cb_len)
 45 74b37681 2019-02-07 stsp 
 46 af45e626 2019-02-08 stsp static const struct got_error *buf_grow(BUF *, size_t);
 47 74b37681 2019-02-07 stsp 
 48 74b37681 2019-02-07 stsp /*
 49 74b37681 2019-02-07 stsp  * Create a new buffer structure and return a pointer to it.  This structure
 50 74b37681 2019-02-07 stsp  * uses dynamically-allocated memory and must be freed with buf_free(), once
 51 74b37681 2019-02-07 stsp  * the buffer is no longer needed.
 52 74b37681 2019-02-07 stsp  */
 53 575e8218 2019-10-07 stsp const struct got_error *
 54 575e8218 2019-10-07 stsp buf_alloc(BUF **b, size_t len)
 55 74b37681 2019-02-07 stsp {
 56 575e8218 2019-10-07 stsp 	const struct got_error *err = NULL;
 57 74b37681 2019-02-07 stsp 
 58 575e8218 2019-10-07 stsp 	*b = malloc(sizeof(**b));
 59 575e8218 2019-10-07 stsp 	if (*b == NULL)
 60 1df44de6 2022-07-06 op 		return got_error_from_errno("malloc");
 61 74b37681 2019-02-07 stsp 	/* Postpone creation of zero-sized buffers */
 62 af45e626 2019-02-08 stsp 	if (len > 0) {
 63 575e8218 2019-10-07 stsp 		(*b)->cb_buf = calloc(1, len);
 64 575e8218 2019-10-07 stsp 		if ((*b)->cb_buf == NULL) {
 65 575e8218 2019-10-07 stsp 			err = got_error_from_errno("calloc");
 66 575e8218 2019-10-07 stsp 			free(*b);
 67 575e8218 2019-10-07 stsp 			*b = NULL;
 68 575e8218 2019-10-07 stsp 			return err;
 69 57ebf19f 2019-08-28 hiltjo 		}
 70 af45e626 2019-02-08 stsp 	} else
 71 575e8218 2019-10-07 stsp 		(*b)->cb_buf = NULL;
 72 74b37681 2019-02-07 stsp 
 73 575e8218 2019-10-07 stsp 	(*b)->cb_size = len;
 74 575e8218 2019-10-07 stsp 	(*b)->cb_len = 0;
 75 74b37681 2019-02-07 stsp 
 76 575e8218 2019-10-07 stsp 	return NULL;
 77 74b37681 2019-02-07 stsp }
 78 74b37681 2019-02-07 stsp 
 79 74b37681 2019-02-07 stsp /*
 80 74b37681 2019-02-07 stsp  * Open the file specified by <path> and load all of its contents into a
 81 74b37681 2019-02-07 stsp  * buffer.
 82 74b37681 2019-02-07 stsp  * Returns the loaded buffer on success or NULL on failure.
 83 74b37681 2019-02-07 stsp  * Sets errno on error.
 84 74b37681 2019-02-07 stsp  */
 85 575e8218 2019-10-07 stsp const struct got_error *
 86 db590691 2021-06-02 stsp buf_load(BUF **buf, FILE *f)
 87 74b37681 2019-02-07 stsp {
 88 575e8218 2019-10-07 stsp 	const struct got_error *err = NULL;
 89 db590691 2021-06-02 stsp 	size_t ret;
 90 74b37681 2019-02-07 stsp 	size_t len;
 91 74b37681 2019-02-07 stsp 	u_char *bp;
 92 74b37681 2019-02-07 stsp 	struct stat st;
 93 74b37681 2019-02-07 stsp 
 94 575e8218 2019-10-07 stsp 	*buf = NULL;
 95 74b37681 2019-02-07 stsp 
 96 db590691 2021-06-02 stsp 	if (fstat(fileno(f), &st) == -1) {
 97 db590691 2021-06-02 stsp 		err = got_error_from_errno("fstat");
 98 74b37681 2019-02-07 stsp 		goto out;
 99 575e8218 2019-10-07 stsp 	}
100 74b37681 2019-02-07 stsp 
101 74b37681 2019-02-07 stsp 	if ((uintmax_t)st.st_size > SIZE_MAX) {
102 db590691 2021-06-02 stsp 		err = got_error_set_errno(EFBIG,
103 db590691 2021-06-02 stsp 		    "cannot fit file into memory buffer");
104 74b37681 2019-02-07 stsp 		goto out;
105 74b37681 2019-02-07 stsp 	}
106 575e8218 2019-10-07 stsp 	err = buf_alloc(buf, st.st_size);
107 575e8218 2019-10-07 stsp 	if (err)
108 575e8218 2019-10-07 stsp 		goto out;
109 db590691 2021-06-02 stsp 	for (bp = (*buf)->cb_buf; ; bp += ret) {
110 575e8218 2019-10-07 stsp 		len = SIZE_LEFT(*buf);
111 db590691 2021-06-02 stsp 		ret = fread(bp, 1, len, f);
112 db590691 2021-06-02 stsp 		if (ret == 0 && ferror(f)) {
113 db590691 2021-06-02 stsp 			err = got_ferror(f, GOT_ERR_IO);
114 74b37681 2019-02-07 stsp 			goto out;
115 74b37681 2019-02-07 stsp 		} else if (ret == 0)
116 74b37681 2019-02-07 stsp 			break;
117 74b37681 2019-02-07 stsp 
118 575e8218 2019-10-07 stsp 		(*buf)->cb_len += (size_t)ret;
119 74b37681 2019-02-07 stsp 	}
120 74b37681 2019-02-07 stsp 
121 74b37681 2019-02-07 stsp out:
122 575e8218 2019-10-07 stsp 	if (err) {
123 575e8218 2019-10-07 stsp 		buf_free(*buf);
124 575e8218 2019-10-07 stsp 		*buf = NULL;
125 74b37681 2019-02-07 stsp 	}
126 575e8218 2019-10-07 stsp 	return err;
127 1bd8e3b1 2022-07-12 jrick }
128 1bd8e3b1 2022-07-12 jrick 
129 1bd8e3b1 2022-07-12 jrick const struct got_error *
130 1bd8e3b1 2022-07-12 jrick buf_load_fd(BUF **buf, int fd)
131 1bd8e3b1 2022-07-12 jrick {
132 1bd8e3b1 2022-07-12 jrick 	const struct got_error *err = NULL;
133 1bd8e3b1 2022-07-12 jrick 	unsigned char out[8192];
134 1bd8e3b1 2022-07-12 jrick 	ssize_t r;
135 1bd8e3b1 2022-07-12 jrick 	size_t len;
136 1bd8e3b1 2022-07-12 jrick 
137 1bd8e3b1 2022-07-12 jrick 	err = buf_alloc(buf, 8192);
138 1bd8e3b1 2022-07-12 jrick 	if (err)
139 1bd8e3b1 2022-07-12 jrick 		return err;
140 1bd8e3b1 2022-07-12 jrick 
141 1bd8e3b1 2022-07-12 jrick 	do {
142 1bd8e3b1 2022-07-12 jrick 		r = read(fd, out, sizeof(out));
143 1bd8e3b1 2022-07-12 jrick 		if (r == -1)
144 1bd8e3b1 2022-07-12 jrick 			return got_error_from_errno("read");
145 1bd8e3b1 2022-07-12 jrick 		if (r > 0) {
146 1bd8e3b1 2022-07-12 jrick 			err = buf_append(&len, *buf, out, r);
147 1bd8e3b1 2022-07-12 jrick 			if (err)
148 1bd8e3b1 2022-07-12 jrick 				return err;
149 1bd8e3b1 2022-07-12 jrick 		}
150 1bd8e3b1 2022-07-12 jrick 	} while (r > 0);
151 1bd8e3b1 2022-07-12 jrick 
152 1bd8e3b1 2022-07-12 jrick 	return NULL;
153 74b37681 2019-02-07 stsp }
154 74b37681 2019-02-07 stsp 
155 74b37681 2019-02-07 stsp void
156 74b37681 2019-02-07 stsp buf_free(BUF *b)
157 74b37681 2019-02-07 stsp {
158 74b37681 2019-02-07 stsp 	if (b == NULL)
159 74b37681 2019-02-07 stsp 		return;
160 74b37681 2019-02-07 stsp 	free(b->cb_buf);
161 74b37681 2019-02-07 stsp 	free(b);
162 74b37681 2019-02-07 stsp }
163 74b37681 2019-02-07 stsp 
164 74b37681 2019-02-07 stsp /*
165 74b37681 2019-02-07 stsp  * Free the buffer <b>'s structural information but do not free the contents
166 74b37681 2019-02-07 stsp  * of the buffer.  Instead, they are returned and should be freed later using
167 74b37681 2019-02-07 stsp  * free().
168 74b37681 2019-02-07 stsp  */
169 74b37681 2019-02-07 stsp void *
170 74b37681 2019-02-07 stsp buf_release(BUF *b)
171 74b37681 2019-02-07 stsp {
172 74b37681 2019-02-07 stsp 	void *tmp;
173 74b37681 2019-02-07 stsp 
174 74b37681 2019-02-07 stsp 	tmp = b->cb_buf;
175 74b37681 2019-02-07 stsp 	free(b);
176 74b37681 2019-02-07 stsp 	return (tmp);
177 74b37681 2019-02-07 stsp }
178 74b37681 2019-02-07 stsp 
179 74b37681 2019-02-07 stsp u_char *
180 74b37681 2019-02-07 stsp buf_get(BUF *b)
181 74b37681 2019-02-07 stsp {
182 74b37681 2019-02-07 stsp 	return (b->cb_buf);
183 74b37681 2019-02-07 stsp }
184 74b37681 2019-02-07 stsp 
185 74b37681 2019-02-07 stsp /*
186 74b37681 2019-02-07 stsp  * Empty the contents of the buffer <b> and reset pointers.
187 74b37681 2019-02-07 stsp  */
188 74b37681 2019-02-07 stsp void
189 74b37681 2019-02-07 stsp buf_empty(BUF *b)
190 74b37681 2019-02-07 stsp {
191 74b37681 2019-02-07 stsp 	memset(b->cb_buf, 0, b->cb_size);
192 74b37681 2019-02-07 stsp 	b->cb_len = 0;
193 74b37681 2019-02-07 stsp }
194 74b37681 2019-02-07 stsp 
195 13b2bc37 2022-10-23 stsp /* Discard the leading <n> bytes from the buffer. */
196 13b2bc37 2022-10-23 stsp const struct got_error *
197 13b2bc37 2022-10-23 stsp buf_discard(BUF *b, size_t n)
198 13b2bc37 2022-10-23 stsp {
199 13b2bc37 2022-10-23 stsp 	if (n > b->cb_len)
200 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_RANGE);
201 13b2bc37 2022-10-23 stsp 
202 13b2bc37 2022-10-23 stsp 	if (n == b->cb_len)
203 13b2bc37 2022-10-23 stsp 		buf_empty(b);
204 13b2bc37 2022-10-23 stsp 	else {
205 13b2bc37 2022-10-23 stsp 		memmove(b->cb_buf, b->cb_buf + n, b->cb_len - n);
206 13b2bc37 2022-10-23 stsp 		b->cb_len -= n;
207 13b2bc37 2022-10-23 stsp 	}
208 13b2bc37 2022-10-23 stsp 
209 13b2bc37 2022-10-23 stsp 	return NULL;
210 13b2bc37 2022-10-23 stsp }
211 13b2bc37 2022-10-23 stsp 
212 74b37681 2019-02-07 stsp /*
213 74b37681 2019-02-07 stsp  * Append a single character <c> to the end of the buffer <b>.
214 74b37681 2019-02-07 stsp  */
215 af45e626 2019-02-08 stsp const struct got_error *
216 74b37681 2019-02-07 stsp buf_putc(BUF *b, int c)
217 74b37681 2019-02-07 stsp {
218 af45e626 2019-02-08 stsp 	const struct got_error *err = NULL;
219 74b37681 2019-02-07 stsp 	u_char *bp;
220 74b37681 2019-02-07 stsp 
221 af45e626 2019-02-08 stsp 	if (SIZE_LEFT(b) == 0) {
222 af45e626 2019-02-08 stsp 		err = buf_grow(b, BUF_INCR);
223 af45e626 2019-02-08 stsp 		if (err)
224 af45e626 2019-02-08 stsp 			return err;
225 af45e626 2019-02-08 stsp 	}
226 74b37681 2019-02-07 stsp 	bp = b->cb_buf + b->cb_len;
227 74b37681 2019-02-07 stsp 	*bp = (u_char)c;
228 74b37681 2019-02-07 stsp 	b->cb_len++;
229 af45e626 2019-02-08 stsp 	return NULL;
230 74b37681 2019-02-07 stsp }
231 74b37681 2019-02-07 stsp 
232 74b37681 2019-02-07 stsp /*
233 74b37681 2019-02-07 stsp  * Append a string <s> to the end of buffer <b>.
234 74b37681 2019-02-07 stsp  */
235 af45e626 2019-02-08 stsp const struct got_error *
236 af45e626 2019-02-08 stsp buf_puts(size_t *newlen, BUF *b, const char *str)
237 74b37681 2019-02-07 stsp {
238 af45e626 2019-02-08 stsp 	return buf_append(newlen, b, str, strlen(str));
239 74b37681 2019-02-07 stsp }
240 74b37681 2019-02-07 stsp 
241 74b37681 2019-02-07 stsp /*
242 74b37681 2019-02-07 stsp  * Return u_char at buffer position <pos>.
243 74b37681 2019-02-07 stsp  */
244 74b37681 2019-02-07 stsp u_char
245 74b37681 2019-02-07 stsp buf_getc(BUF *b, size_t pos)
246 74b37681 2019-02-07 stsp {
247 74b37681 2019-02-07 stsp 	return (b->cb_buf[pos]);
248 74b37681 2019-02-07 stsp }
249 74b37681 2019-02-07 stsp 
250 74b37681 2019-02-07 stsp /*
251 74b37681 2019-02-07 stsp  * Append <len> bytes of data pointed to by <data> to the buffer <b>.  If the
252 74b37681 2019-02-07 stsp  * buffer is too small to accept all data, it will get resized to an
253 74b37681 2019-02-07 stsp  * appropriate size to accept all data.
254 74b37681 2019-02-07 stsp  * Returns the number of bytes successfully appended to the buffer.
255 74b37681 2019-02-07 stsp  */
256 af45e626 2019-02-08 stsp const struct got_error *
257 af45e626 2019-02-08 stsp buf_append(size_t *newlen, BUF *b, const void *data, size_t len)
258 74b37681 2019-02-07 stsp {
259 af45e626 2019-02-08 stsp 	const struct got_error *err = NULL;
260 74b37681 2019-02-07 stsp 	size_t left, rlen;
261 74b37681 2019-02-07 stsp 	u_char *bp;
262 74b37681 2019-02-07 stsp 
263 74b37681 2019-02-07 stsp 	left = SIZE_LEFT(b);
264 74b37681 2019-02-07 stsp 	rlen = len;
265 74b37681 2019-02-07 stsp 
266 af45e626 2019-02-08 stsp 	if (left < len) {
267 af45e626 2019-02-08 stsp 		err = buf_grow(b, len - left);
268 af45e626 2019-02-08 stsp 		if (err)
269 af45e626 2019-02-08 stsp 			return err;
270 af45e626 2019-02-08 stsp 	}
271 74b37681 2019-02-07 stsp 	bp = b->cb_buf + b->cb_len;
272 74b37681 2019-02-07 stsp 	memcpy(bp, data, rlen);
273 74b37681 2019-02-07 stsp 	b->cb_len += rlen;
274 74b37681 2019-02-07 stsp 
275 af45e626 2019-02-08 stsp 	*newlen = rlen;
276 af45e626 2019-02-08 stsp 	return NULL;
277 74b37681 2019-02-07 stsp }
278 74b37681 2019-02-07 stsp 
279 74b37681 2019-02-07 stsp /*
280 74b37681 2019-02-07 stsp  * Returns the size of the buffer that is being used.
281 74b37681 2019-02-07 stsp  */
282 74b37681 2019-02-07 stsp size_t
283 74b37681 2019-02-07 stsp buf_len(BUF *b)
284 74b37681 2019-02-07 stsp {
285 74b37681 2019-02-07 stsp 	return (b->cb_len);
286 74b37681 2019-02-07 stsp }
287 74b37681 2019-02-07 stsp 
288 74b37681 2019-02-07 stsp /*
289 74b37681 2019-02-07 stsp  * Write the contents of the buffer <b> to the specified <fd>
290 74b37681 2019-02-07 stsp  */
291 74b37681 2019-02-07 stsp int
292 74b37681 2019-02-07 stsp buf_write_fd(BUF *b, int fd)
293 74b37681 2019-02-07 stsp {
294 74b37681 2019-02-07 stsp 	u_char *bp;
295 74b37681 2019-02-07 stsp 	size_t len;
296 74b37681 2019-02-07 stsp 	ssize_t ret;
297 74b37681 2019-02-07 stsp 
298 74b37681 2019-02-07 stsp 	len = b->cb_len;
299 74b37681 2019-02-07 stsp 	bp = b->cb_buf;
300 74b37681 2019-02-07 stsp 
301 74b37681 2019-02-07 stsp 	do {
302 74b37681 2019-02-07 stsp 		ret = write(fd, bp, len);
303 74b37681 2019-02-07 stsp 		if (ret == -1) {
304 74b37681 2019-02-07 stsp 			if (errno == EINTR || errno == EAGAIN)
305 74b37681 2019-02-07 stsp 				continue;
306 74b37681 2019-02-07 stsp 			return (-1);
307 74b37681 2019-02-07 stsp 		}
308 74b37681 2019-02-07 stsp 
309 74b37681 2019-02-07 stsp 		len -= (size_t)ret;
310 74b37681 2019-02-07 stsp 		bp += (size_t)ret;
311 74b37681 2019-02-07 stsp 	} while (len > 0);
312 74b37681 2019-02-07 stsp 
313 74b37681 2019-02-07 stsp 	return (0);
314 74b37681 2019-02-07 stsp }
315 74b37681 2019-02-07 stsp 
316 74b37681 2019-02-07 stsp /*
317 74b37681 2019-02-07 stsp  * Write the contents of the buffer <b> to the file whose path is given in
318 74b37681 2019-02-07 stsp  * <path>.  If the file does not exist, it is created with mode <mode>.
319 74b37681 2019-02-07 stsp  */
320 af45e626 2019-02-08 stsp const struct got_error *
321 74b37681 2019-02-07 stsp buf_write(BUF *b, const char *path, mode_t mode)
322 74b37681 2019-02-07 stsp {
323 af45e626 2019-02-08 stsp 	const struct got_error *err = NULL;
324 74b37681 2019-02-07 stsp 	int fd;
325 74b37681 2019-02-07 stsp  open:
326 8bd0cdad 2021-12-31 stsp 	if ((fd = open(path, O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, mode)) == -1) {
327 202329ae 2019-08-11 stsp 		err = got_error_from_errno2("open", path);
328 74b37681 2019-02-07 stsp 		if (errno == EACCES && unlink(path) != -1)
329 74b37681 2019-02-07 stsp 			goto open;
330 74b37681 2019-02-07 stsp 		else
331 202329ae 2019-08-11 stsp 			return err;
332 74b37681 2019-02-07 stsp 	}
333 74b37681 2019-02-07 stsp 
334 74b37681 2019-02-07 stsp 	if (buf_write_fd(b, fd) == -1) {
335 638f9024 2019-05-13 stsp 		err = got_error_from_errno("buf_write_fd");
336 74b37681 2019-02-07 stsp 		(void)unlink(path);
337 af45e626 2019-02-08 stsp 		return err;
338 74b37681 2019-02-07 stsp 	}
339 74b37681 2019-02-07 stsp 
340 74b37681 2019-02-07 stsp 	if (fchmod(fd, mode) < 0)
341 638f9024 2019-05-13 stsp 		err = got_error_from_errno2("fchmod", path);
342 74b37681 2019-02-07 stsp 
343 08578a35 2021-01-22 stsp 	if (close(fd) == -1 && err == NULL)
344 638f9024 2019-05-13 stsp 		err = got_error_from_errno2("close", path);
345 74b37681 2019-02-07 stsp 
346 af45e626 2019-02-08 stsp 	return err;
347 74b37681 2019-02-07 stsp }
348 74b37681 2019-02-07 stsp 
349 74b37681 2019-02-07 stsp /*
350 74b37681 2019-02-07 stsp  * Write the contents of the buffer <b> to a temporary file whose path is
351 74b37681 2019-02-07 stsp  * specified using <template> (see mkstemp.3).
352 74b37681 2019-02-07 stsp  * NB. This function will modify <template>, as per mkstemp
353 74b37681 2019-02-07 stsp  */
354 af45e626 2019-02-08 stsp const struct got_error *
355 96cbb597 2019-10-09 stsp buf_write_stmp(BUF *b, char *template)
356 74b37681 2019-02-07 stsp {
357 af45e626 2019-02-08 stsp 	const struct got_error *err = NULL;
358 74b37681 2019-02-07 stsp 	int fd;
359 74b37681 2019-02-07 stsp 
360 74b37681 2019-02-07 stsp 	if ((fd = mkstemp(template)) == -1)
361 638f9024 2019-05-13 stsp 		return got_error_from_errno("mkstemp");
362 74b37681 2019-02-07 stsp 
363 74b37681 2019-02-07 stsp 	if (buf_write_fd(b, fd) == -1) {
364 638f9024 2019-05-13 stsp 		err = got_error_from_errno("buf_write_fd");
365 74b37681 2019-02-07 stsp 		(void)unlink(template);
366 74b37681 2019-02-07 stsp 	}
367 74b37681 2019-02-07 stsp 
368 08578a35 2021-01-22 stsp 	if (close(fd) == -1 && err == NULL)
369 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
370 3a6ce05a 2019-02-11 stsp 
371 af45e626 2019-02-08 stsp 	return err;
372 74b37681 2019-02-07 stsp }
373 74b37681 2019-02-07 stsp 
374 74b37681 2019-02-07 stsp /*
375 74b37681 2019-02-07 stsp  * Grow the buffer <b> by <len> bytes.  The contents are unchanged by this
376 74b37681 2019-02-07 stsp  * operation regardless of the result.
377 74b37681 2019-02-07 stsp  */
378 af45e626 2019-02-08 stsp static const struct got_error *
379 74b37681 2019-02-07 stsp buf_grow(BUF *b, size_t len)
380 74b37681 2019-02-07 stsp {
381 af45e626 2019-02-08 stsp 	u_char *buf;
382 af45e626 2019-02-08 stsp 	buf = reallocarray(b->cb_buf, 1, b->cb_size + len);
383 af45e626 2019-02-08 stsp 	if (buf == NULL)
384 638f9024 2019-05-13 stsp 		return got_error_from_errno("reallocarray");
385 af45e626 2019-02-08 stsp 	b->cb_buf = buf;
386 74b37681 2019-02-07 stsp 	b->cb_size += len;
387 af45e626 2019-02-08 stsp 	return NULL;
388 74b37681 2019-02-07 stsp }