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-rw-r--r--support/passwd_common.c344
1 files changed, 344 insertions, 0 deletions
diff --git a/support/passwd_common.c b/support/passwd_common.c
new file mode 100644
index 0000000..664e509
--- /dev/null
+++ b/support/passwd_common.c
@@ -0,0 +1,344 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "passwd_common.h"
+#include "apr_strings.h"
+#include "apr_errno.h"
+
+#if APR_HAVE_STDIO_H
+#include <stdio.h>
+#endif
+
+#include "apr_md5.h"
+#include "apr_sha1.h"
+
+#if APR_HAVE_TIME_H
+#include <time.h>
+#endif
+#if APR_HAVE_CRYPT_H
+#include <crypt.h>
+#endif
+#if APR_HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#if APR_HAVE_STRING_H
+#include <string.h>
+#endif
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if APR_HAVE_IO_H
+#include <io.h>
+#endif
+
+#ifdef _MSC_VER
+#define write _write
+#endif
+
+apr_file_t *errfile;
+
+int abort_on_oom(int rc)
+{
+ const char *buf = "Error: out of memory\n";
+ int written, count = strlen(buf);
+ do {
+ written = write(STDERR_FILENO, buf, count);
+ if (written == count)
+ break;
+ if (written > 0) {
+ buf += written;
+ count -= written;
+ }
+ } while (written >= 0 || errno == EINTR);
+ abort();
+ /* NOTREACHED */
+ return 0;
+}
+
+static int generate_salt(char *s, size_t size, const char **errstr,
+ apr_pool_t *pool)
+{
+ unsigned char rnd[32];
+ static const char itoa64[] =
+ "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+ apr_size_t n;
+ unsigned int val = 0, bits = 0;
+ apr_status_t rv;
+
+ n = (size * 6 + 7)/8;
+ if (n > sizeof(rnd)) {
+ apr_file_printf(errfile, "generate_salt(): BUG: Buffer too small");
+ abort();
+ }
+ rv = apr_generate_random_bytes(rnd, n);
+ if (rv) {
+ *errstr = apr_psprintf(pool, "Unable to generate random bytes: %pm",
+ &rv);
+ return ERR_RANDOM;
+ }
+ n = 0;
+ while (size > 0) {
+ if (bits < 6) {
+ val |= (rnd[n++] << bits);
+ bits += 8;
+ }
+ *s++ = itoa64[val & 0x3f];
+ size--;
+ val >>= 6;
+ bits -= 6;
+ }
+ *s = '\0';
+ return 0;
+}
+
+void putline(apr_file_t *f, const char *l)
+{
+ apr_status_t rv;
+ if (f == NULL)
+ return;
+ rv = apr_file_puts(l, f);
+ if (rv != APR_SUCCESS) {
+ apr_file_printf(errfile, "Error writing temp file: %pm", &rv);
+ apr_file_close(f);
+ exit(ERR_FILEPERM);
+ }
+}
+
+int get_password(struct passwd_ctx *ctx)
+{
+ char buf[MAX_STRING_LEN + 1];
+ if (ctx->passwd_src == PW_STDIN) {
+ apr_file_t *file_stdin;
+ apr_size_t nread;
+ if (apr_file_open_stdin(&file_stdin, ctx->pool) != APR_SUCCESS) {
+ ctx->errstr = "Unable to read from stdin.";
+ return ERR_GENERAL;
+ }
+ if (apr_file_read_full(file_stdin, buf, sizeof(buf) - 1,
+ &nread) != APR_EOF
+ || nread == sizeof(buf) - 1) {
+ goto err_too_long;
+ }
+ buf[nread] = '\0';
+ if (nread >= 1 && buf[nread-1] == '\n') {
+ buf[nread-1] = '\0';
+ if (nread >= 2 && buf[nread-2] == '\r')
+ buf[nread-2] = '\0';
+ }
+ apr_file_close(file_stdin);
+ ctx->passwd = apr_pstrdup(ctx->pool, buf);
+ }
+ else if (ctx->passwd_src == PW_PROMPT_VERIFY) {
+ apr_size_t bufsize = sizeof(buf);
+ if (apr_password_get("Enter password: ", buf, &bufsize) != 0)
+ goto err_too_long;
+ ctx->passwd = apr_pstrdup(ctx->pool, buf);
+ }
+ else {
+ apr_size_t bufsize = sizeof(buf);
+ if (apr_password_get("New password: ", buf, &bufsize) != 0)
+ goto err_too_long;
+ ctx->passwd = apr_pstrdup(ctx->pool, buf);
+ bufsize = sizeof(buf);
+ buf[0] = '\0';
+ apr_password_get("Re-type new password: ", buf, &bufsize);
+ if (strcmp(ctx->passwd, buf) != 0) {
+ ctx->errstr = "password verification error";
+ memset(ctx->passwd, '\0', strlen(ctx->passwd));
+ memset(buf, '\0', sizeof(buf));
+ return ERR_PWMISMATCH;
+ }
+ }
+ memset(buf, '\0', sizeof(buf));
+ return 0;
+
+err_too_long:
+ ctx->errstr = apr_psprintf(ctx->pool,
+ "password too long (>%" APR_SIZE_T_FMT ")",
+ sizeof(buf) - 1);
+ return ERR_OVERFLOW;
+}
+
+/*
+ * Make a password record from the given information. A zero return
+ * indicates success; on failure, ctx->errstr points to the error message.
+ */
+int mkhash(struct passwd_ctx *ctx)
+{
+ char *pw;
+ char salt[16];
+ apr_status_t rv;
+ int ret = 0;
+#if CRYPT_ALGO_SUPPORTED
+ char *cbuf;
+#endif
+
+ if (ctx->cost != 0 && ctx->alg != ALG_BCRYPT) {
+ apr_file_printf(errfile,
+ "Warning: Ignoring -C argument for this algorithm." NL);
+ }
+
+ if (ctx->passwd == NULL) {
+ if ((ret = get_password(ctx)) != 0)
+ return ret;
+ }
+ pw = ctx->passwd;
+
+ switch (ctx->alg) {
+ case ALG_APSHA:
+ /* XXX out >= 28 + strlen(sha1) chars - fixed len SHA */
+ apr_sha1_base64(pw, strlen(pw), ctx->out);
+ break;
+
+ case ALG_APMD5:
+ ret = generate_salt(salt, 8, &ctx->errstr, ctx->pool);
+ if (ret != 0)
+ break;
+ rv = apr_md5_encode(pw, salt, ctx->out, ctx->out_len);
+ if (rv != APR_SUCCESS) {
+ ctx->errstr = apr_psprintf(ctx->pool,
+ "could not encode password: %pm", &rv);
+ ret = ERR_GENERAL;
+ }
+ break;
+
+ case ALG_PLAIN:
+ /* XXX this len limitation is not in sync with any HTTPd len. */
+ apr_cpystrn(ctx->out, pw, ctx->out_len);
+ break;
+
+#if CRYPT_ALGO_SUPPORTED
+ case ALG_CRYPT:
+ ret = generate_salt(salt, 8, &ctx->errstr, ctx->pool);
+ if (ret != 0)
+ break;
+ cbuf = crypt(pw, salt);
+ if (cbuf == NULL) {
+ rv = APR_FROM_OS_ERROR(errno);
+ ctx->errstr = apr_psprintf(ctx->pool, "crypt() failed: %pm", &rv);
+ ret = ERR_PWMISMATCH;
+ break;
+ }
+
+ apr_cpystrn(ctx->out, cbuf, ctx->out_len - 1);
+ if (strlen(pw) > 8) {
+ char *truncpw = apr_pstrdup(ctx->pool, pw);
+ truncpw[8] = '\0';
+ if (!strcmp(ctx->out, crypt(truncpw, salt))) {
+ apr_file_printf(errfile, "Warning: Password truncated to 8 "
+ "characters by CRYPT algorithm." NL);
+ }
+ memset(truncpw, '\0', strlen(pw));
+ }
+ break;
+#endif /* CRYPT_ALGO_SUPPORTED */
+
+#if BCRYPT_ALGO_SUPPORTED
+ case ALG_BCRYPT:
+ rv = apr_generate_random_bytes((unsigned char*)salt, 16);
+ if (rv != APR_SUCCESS) {
+ ctx->errstr = apr_psprintf(ctx->pool, "Unable to generate random "
+ "bytes: %pm", &rv);
+ ret = ERR_RANDOM;
+ break;
+ }
+
+ if (ctx->cost == 0)
+ ctx->cost = BCRYPT_DEFAULT_COST;
+ rv = apr_bcrypt_encode(pw, ctx->cost, (unsigned char*)salt, 16,
+ ctx->out, ctx->out_len);
+ if (rv != APR_SUCCESS) {
+ ctx->errstr = apr_psprintf(ctx->pool, "Unable to encode with "
+ "bcrypt: %pm", &rv);
+ ret = ERR_PWMISMATCH;
+ break;
+ }
+ break;
+#endif /* BCRYPT_ALGO_SUPPORTED */
+
+ default:
+ apr_file_printf(errfile, "mkhash(): BUG: invalid algorithm %d",
+ ctx->alg);
+ abort();
+ }
+ memset(pw, '\0', strlen(pw));
+ return ret;
+}
+
+int parse_common_options(struct passwd_ctx *ctx, char opt,
+ const char *opt_arg)
+{
+ switch (opt) {
+ case 'b':
+ ctx->passwd_src = PW_ARG;
+ break;
+ case 'i':
+ ctx->passwd_src = PW_STDIN;
+ break;
+ case 'm':
+ ctx->alg = ALG_APMD5;
+ break;
+ case 's':
+ ctx->alg = ALG_APSHA;
+ break;
+ case 'p':
+ ctx->alg = ALG_PLAIN;
+#if !PLAIN_ALGO_SUPPORTED
+ /* Backward compatible behavior: Just print a warning */
+ apr_file_printf(errfile,
+ "Warning: storing passwords as plain text might just "
+ "not work on this platform." NL);
+#endif
+ break;
+ case 'd':
+#if CRYPT_ALGO_SUPPORTED
+ ctx->alg = ALG_CRYPT;
+#else
+ /* Backward compatible behavior: Use MD5. OK since MD5 is more secure */
+ apr_file_printf(errfile,
+ "Warning: CRYPT algorithm not supported on this "
+ "platform." NL
+ "Automatically using MD5 format." NL);
+ ctx->alg = ALG_APMD5;
+#endif
+ break;
+ case 'B':
+#if BCRYPT_ALGO_SUPPORTED
+ ctx->alg = ALG_BCRYPT;
+#else
+ /* Don't fall back to something less secure */
+ ctx->errstr = "BCRYPT algorithm not supported on this platform";
+ return ERR_ALG_NOT_SUPP;
+#endif
+ break;
+ case 'C': {
+ char *endptr;
+ long num = strtol(opt_arg, &endptr, 10);
+ if (*endptr != '\0' || num <= 0) {
+ ctx->errstr = "argument to -C must be a positive integer";
+ return ERR_SYNTAX;
+ }
+ ctx->cost = num;
+ break;
+ }
+ default:
+ apr_file_printf(errfile,
+ "parse_common_options(): BUG: invalid option %c",
+ opt);
+ abort();
+ }
+ return 0;
+}
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