On Thu, Apr 25, 2019 at 08:59:56PM -0600, Theo de Raadt wrote:
> > + argv = alloca((n + 1) * sizeof(*argv));
>
> Our source tree is exceedingly sparing in the use of alloca().
> This will not do.
Was staying as close as possible to exec.c, but avoiding alloca is
preferable; replaced with reallocarray. err message is "reallocarray" to
match style with the calloc call in the same file.
diff --git usr.sbin/ikectl/ikeca.c usr.sbin/ikectl/ikeca.c
index bac76ab9c2f..eda957d1b2f 100644
--- usr.sbin/ikectl/ikeca.c
+++ usr.sbin/ikectl/ikeca.c
@@ -18,11 +18,13 @@
#include <sys/types.h>
#include <sys/stat.h>
+#include <sys/wait.h>
#include <stdio.h>
#include <unistd.h>
#include <err.h>
#include <errno.h>
#include <string.h>
+#include <stdarg.h>
#include <stdlib.h>
#include <pwd.h>
#include <fcntl.h>
@@ -63,12 +65,12 @@
struct ca {
char sslpath[PATH_MAX];
- char passfile[PATH_MAX];
+ char passfile[PATH_MAX + 5]; // Includes the "file:" prefix
char index[PATH_MAX];
char serial[PATH_MAX];
char sslcnf[PATH_MAX];
char extcnf[PATH_MAX];
- char batch[PATH_MAX];
+ char *batch;
char *caname;
};
@@ -116,6 +118,7 @@ void ca_setenv(const char *, const char *);
void ca_clrenv(void);
void ca_setcnf(struct ca *, const char *);
void ca_create_index(struct ca *);
+static void ca_system(char *, ...);
/* util.c */
int expand_string(char *, size_t, const char *, const char *);
@@ -130,7 +133,6 @@ int
ca_key_create(struct ca *ca, char *keyname)
{
struct stat st;
- char cmd[PATH_MAX * 2];
char path[PATH_MAX];
snprintf(path, sizeof(path), "%s/private/%s.key", ca->sslpath, keyname);
@@ -140,10 +142,7 @@ ca_key_create(struct ca *ca, char *keyname)
return (0);
}
- snprintf(cmd, sizeof(cmd),
- "%s genrsa -out %s 2048",
- PATH_OPENSSL, path);
- system(cmd);
+ ca_system(PATH_OPENSSL, "genrsa", "-out", path, "2048", NULL);
chmod(path, 0600);
return (0);
@@ -200,9 +199,9 @@ ca_delkey(struct ca *ca, char *keyname)
int
ca_request(struct ca *ca, char *keyname, int type)
{
- char cmd[PATH_MAX * 2];
char hostname[HOST_NAME_MAX+1];
char name[128];
+ char key[PATH_MAX];
char path[PATH_MAX];
ca_setenv("$ENV::CERT_CN", keyname);
@@ -226,13 +225,11 @@ ca_request(struct ca *ca, char *keyname, int type)
ca_setcnf(ca, keyname);
+ snprintf(key, sizeof(key), "%s/private/%s.key", ca->sslpath, keyname);
snprintf(path, sizeof(path), "%s/private/%s.csr", ca->sslpath, keyname);
- snprintf(cmd, sizeof(cmd), "%s req %s-new"
- " -key %s/private/%s.key -out %s -config %s",
- PATH_OPENSSL, ca->batch, ca->sslpath, keyname,
- path, ca->sslcnf);
- system(cmd);
+ ca_system(PATH_OPENSSL, "req", "-new", "-key", key, "-out", path,
+ "-config", ca->sslcnf, ca->batch, NULL);
chmod(path, 0600);
return (0);
@@ -241,8 +238,11 @@ ca_request(struct ca *ca, char *keyname, int type)
int
ca_sign(struct ca *ca, char *keyname, int type)
{
- char cmd[PATH_MAX * 2];
- const char *extensions = NULL;
+ char cakey[PATH_MAX];
+ char cacrt[PATH_MAX];
+ char out[PATH_MAX];
+ char in[PATH_MAX];
+ char *extensions = NULL;
if (type == HOST_IPADDR) {
extensions = "x509v3_IPAddr";
@@ -258,19 +258,15 @@ ca_sign(struct ca *ca, char *keyname, int type)
ca_setenv("$ENV::CASERIAL", ca->serial);
ca_setcnf(ca, keyname);
- snprintf(cmd, sizeof(cmd),
- "%s ca -config %s -keyfile %s/private/ca.key"
- " -cert %s/ca.crt"
- " -extfile %s -extensions %s -out %s/%s.crt"
- " -in %s/private/%s.csr"
- " -passin file:%s -outdir %s -batch",
- PATH_OPENSSL, ca->sslcnf, ca->sslpath,
- ca->sslpath,
- ca->extcnf, extensions, ca->sslpath, keyname,
- ca->sslpath, keyname,
- ca->passfile, ca->sslpath);
+ snprintf(cakey, sizeof(cakey), "%s/private/ca.key", ca->sslpath);
+ snprintf(cacrt, sizeof(cacrt), "%s/ca.crt", ca->sslpath);
+ snprintf(out, sizeof(out), "%s/%s.crt", ca->sslpath, keyname);
+ snprintf(in, sizeof(in), "%s/private/%s.csr", ca->sslpath, keyname);
- system(cmd);
+ ca_system(PATH_OPENSSL, "ca", "-config", ca->sslcnf, "-keyfile", cakey,
+ "-cert", cacrt, "-extfile", ca->extcnf, "-extensions", extensions,
+ "-out", out, "-in", in, "-passin", ca->passfile,
+ "-outdir", ca->sslpath, "-batch", NULL);
return (0);
}
@@ -313,9 +309,9 @@ int
ca_key_install(struct ca *ca, char *keyname, char *dir)
{
struct stat st;
- char cmd[PATH_MAX * 2];
char src[PATH_MAX];
char dst[PATH_MAX];
+ char out[PATH_MAX];
char *p = NULL;
snprintf(src, sizeof(src), "%s/private/%s.key", ca->sslpath, keyname);
@@ -335,9 +331,10 @@ ca_key_install(struct ca *ca, char *keyname, char *dir)
snprintf(dst, sizeof(dst), "%s/private/local.key", dir);
fcopy(src, dst, 0600);
- snprintf(cmd, sizeof(cmd), "%s rsa -out %s/local.pub"
- " -in %s/private/local.key -pubout", PATH_OPENSSL, dir, dir);
- system(cmd);
+ snprintf(out, sizeof(out), "%s/local.pub", dir);
+
+ ca_system(PATH_OPENSSL, "rsa", "-out", out, "-in", dst, "-pubout",
+ NULL);
free(p);
@@ -405,37 +402,32 @@ ca_newpass(char *passfile, char *password)
int
ca_create(struct ca *ca)
{
- char cmd[PATH_MAX * 2];
- char path[PATH_MAX];
+ char key[PATH_MAX];
+ char csr[PATH_MAX];
+ char crt[PATH_MAX];
ca_clrenv();
- snprintf(path, sizeof(path), "%s/private/ca.key", ca->sslpath);
- snprintf(cmd, sizeof(cmd), "%s genrsa -aes256 -out"
- " %s -passout file:%s 2048", PATH_OPENSSL,
- path, ca->passfile);
- system(cmd);
- chmod(path, 0600);
+ snprintf(key, sizeof(key), "%s/private/ca.key", ca->sslpath);
+ ca_system(PATH_OPENSSL, "genrsa", "-aes256", "-out", key,
+ "-passout", ca->passfile, "2048", NULL);
+ chmod(key, 0600);
ca_setenv("$ENV::CERT_CN", "VPN CA");
ca_setenv("$ENV::REQ_EXT", "x509v3_CA");
ca_setcnf(ca, "ca");
- snprintf(path, sizeof(path), "%s/private/ca.csr", ca->sslpath);
- snprintf(cmd, sizeof(cmd), "%s req %s-new"
- " -key %s/private/ca.key"
- " -config %s -out %s -passin file:%s", PATH_OPENSSL,
- ca->batch, ca->sslpath, ca->sslcnf, path, ca->passfile);
- system(cmd);
- chmod(path, 0600);
+ snprintf(csr, sizeof(csr), "%s/private/ca.csr", ca->sslpath);
+ ca_system(PATH_OPENSSL, "req", "-new", "-key", key,
+ "-config", ca->sslcnf, "-out", csr, "-passin", ca->passfile,
+ ca->batch, NULL);
+ chmod(csr, 0600);
- snprintf(cmd, sizeof(cmd), "%s x509 -req -days 4500"
- " -in %s/private/ca.csr -signkey %s/private/ca.key"
- " -sha256"
- " -extfile %s -extensions x509v3_CA -out %s/ca.crt -passin file:%s",
- PATH_OPENSSL, ca->sslpath, ca->sslpath, ca->extcnf, ca->sslpath,
- ca->passfile);
- system(cmd);
+ snprintf(crt, sizeof(crt), "%s/ca.crt", ca->sslpath);
+ ca_system(PATH_OPENSSL, "x509", "-req", "-days", "4500", "-in", csr,
+ "-signkey", key, "-sha256", "-extfile", ca->extcnf,
+ "-extensions", "x509v3_CA", "-out", crt, "-passin", ca->passfile,
+ NULL);
/* Create the CRL revocation list */
ca_revoke(ca, NULL);
@@ -485,7 +477,6 @@ ca_show_certs(struct ca *ca, char *name)
{
DIR *dir;
struct dirent *de;
- char cmd[PATH_MAX * 2];
char path[PATH_MAX];
char *p;
struct stat st;
@@ -495,9 +486,7 @@ ca_show_certs(struct ca *ca, char *name)
ca->sslpath, name);
if (stat(path, &st) != 0)
err(1, "could not open file %s.crt", name);
- snprintf(cmd, sizeof(cmd), "%s x509 -text"
- " -in %s", PATH_OPENSSL, path);
- system(cmd);
+ ca_system(PATH_OPENSSL, "x509", "-text", "-in", path, NULL);
printf("\n");
return (0);
}
@@ -512,10 +501,9 @@ ca_show_certs(struct ca *ca, char *name)
continue;
snprintf(path, sizeof(path), "%s/%s", ca->sslpath,
de->d_name);
- snprintf(cmd, sizeof(cmd), "%s x509 -subject"
- " -fingerprint -dates -noout -in %s",
- PATH_OPENSSL, path);
- system(cmd);
+ ca_system(PATH_OPENSSL, "x509", "-subject",
+ "-fingerprint", "-dates", "-noout", "-in", path,
+ NULL);
printf("\n");
}
}
@@ -649,10 +637,15 @@ ca_export(struct ca *ca, char *keyname, char *myname,
char *password)
struct stat st;
char *pass;
char prev[_PASSWORD_LEN + 1];
- char cmd[PATH_MAX * 2];
+ char passenv[_PASSWORD_LEN + 8];
char oname[PATH_MAX];
char src[PATH_MAX];
char dst[PATH_MAX];
+ char cacrt[PATH_MAX];
+ char capfx[PATH_MAX];
+ char key[PATH_MAX];
+ char crt[PATH_MAX];
+ char pfx[PATH_MAX];
char *p;
char tpl[] = "/tmp/ikectl.XXXXXXXXXX";
unsigned int i;
@@ -682,22 +675,27 @@ ca_export(struct ca *ca, char *keyname, char *myname,
char *password)
errx(1, "passphrase does not match!");
}
- if (keyname != NULL) {
- snprintf(cmd, sizeof(cmd), "env EXPASS=%s %s pkcs12 -export"
- " -name %s -CAfile %s/ca.crt -inkey %s/private/%s.key"
- " -in %s/%s.crt -out %s/private/%s.pfx -passout env:EXPASS"
- " -passin file:%s", pass, PATH_OPENSSL, keyname,
- ca->sslpath, ca->sslpath, keyname, ca->sslpath, keyname,
- ca->sslpath, oname, ca->passfile);
- system(cmd);
- }
-
- snprintf(cmd, sizeof(cmd), "env EXPASS=%s %s pkcs12 -export"
- " -caname '%s' -name '%s' -cacerts -nokeys"
- " -in %s/ca.crt -out %s/ca.pfx -passout env:EXPASS -passin file:%s",
- pass, PATH_OPENSSL, ca->caname, ca->caname, ca->sslpath,
- ca->sslpath, ca->passfile);
- system(cmd);
+ snprintf(cacrt, sizeof(cacrt), "%s/ca.crt", ca->sslpath);
+ snprintf(capfx, sizeof(capfx), "%s/ca.pfx", ca->sslpath);
+ snprintf(key, sizeof(key), "%s/private/%s.key", ca->sslpath, keyname);
+ snprintf(crt, sizeof(crt), "%s/%s.crt", ca->sslpath, keyname);
+ snprintf(pfx, sizeof(pfx), "%s/private/%s.pfx", ca->sslpath, oname);
+
+ snprintf(passenv, sizeof(passenv), "EXPASS=%s", pass);
+ putenv(passenv);
+
+ if (keyname != NULL)
+ ca_system(PATH_OPENSSL, "pkcs12", "-export", "-name", keyname,
+ "-CAfile", cacrt, "-inkey", key, "-in", crt, "-out", pfx,
+ "-passout", "env:EXPASS", "-passin", ca->passfile, NULL);
+
+ ca_system(PATH_OPENSSL, "pkcs12", "-export", "-caname", ca->caname,
+ "-name", ca->caname, "-cacerts", "-nokeys", "-in", cacrt,
+ "-out", capfx, "-passout", "env:EXPASS", "-passin", ca->passfile,
+ NULL);
+
+ unsetenv("EXPASS");
+ explicit_bzero(passenv, sizeof(passenv));
if ((p = mkdtemp(tpl)) == NULL)
err(1, "could not create temp dir");
@@ -752,21 +750,18 @@ ca_export(struct ca *ca, char *keyname, char *myname,
char *password)
snprintf(dst, sizeof(dst), "%s/certs/%s.crt", p, keyname);
fcopy(src, dst, 0644);
- snprintf(cmd, sizeof(cmd), "%s rsa -out %s/local.pub"
- " -in %s/private/%s.key -pubout", PATH_OPENSSL, p,
- ca->sslpath, keyname);
- system(cmd);
+ snprintf(dst, sizeof(dst), "%s/local.pub", p);
+ ca_system(PATH_OPENSSL, "rsa", "-out", dst, "-in", key,
+ "-pubout", NULL);
}
if (stat(PATH_TAR, &st) == 0) {
+ snprintf(src, sizeof(src), "%s.tgz", oname);
if (keyname == NULL)
- snprintf(cmd, sizeof(cmd), "%s -zcf %s.tgz -C %s .",
- PATH_TAR, oname, ca->sslpath);
+ ca_system(PATH_TAR, "-zcf", src, "-C", ca->sslpath,
+ ".", NULL);
else
- snprintf(cmd, sizeof(cmd), "%s -zcf %s.tgz -C %s .",
- PATH_TAR, oname, p);
- system(cmd);
- snprintf(src, sizeof(src), "%s.tgz", oname);
+ ca_system(PATH_TAR, "-zcf", src, "-C", p, ".", NULL);
if (realpath(src, dst) != NULL)
printf("exported files in %s\n", dst);
}
@@ -795,8 +790,7 @@ ca_export(struct ca *ca, char *keyname, char *myname, char
*password)
err(1, "could not change %s", dst);
snprintf(dst, sizeof(dst), "%s/%s.zip", src, oname);
- snprintf(cmd, sizeof(cmd), "%s -qr %s .", PATH_ZIP, dst);
- system(cmd);
+ ca_system(PATH_ZIP, "-qr", dst, ".", NULL);
printf("exported files in %s\n", dst);
if (chdir(src) == -1)
@@ -849,8 +843,9 @@ int
ca_revoke(struct ca *ca, char *keyname)
{
struct stat st;
- char cmd[PATH_MAX * 2];
char path[PATH_MAX];
+ char cakey[PATH_MAX];
+ char cacrt[PATH_MAX];
if (keyname) {
snprintf(path, sizeof(path), "%s/%s.crt",
@@ -870,27 +865,18 @@ ca_revoke(struct ca *ca, char *keyname)
ca_setcnf(ca, "ca-revoke");
- if (keyname) {
- snprintf(cmd, sizeof(cmd),
- "%s ca %s-config %s -keyfile %s/private/ca.key"
- " -passin file:%s"
- " -cert %s/ca.crt"
- " -revoke %s/%s.crt",
- PATH_OPENSSL, ca->batch, ca->sslcnf,
- ca->sslpath, ca->passfile, ca->sslpath, ca->sslpath,
keyname);
- system(cmd);
- }
-
- snprintf(cmd, sizeof(cmd),
- "%s ca %s-config %s -keyfile %s/private/ca.key"
- " -passin file:%s"
- " -gencrl"
- " -cert %s/ca.crt"
- " -crldays 365"
- " -out %s/ca.crl",
- PATH_OPENSSL, ca->batch, ca->sslcnf, ca->sslpath,
- ca->passfile, ca->sslpath, ca->sslpath);
- system(cmd);
+ snprintf(cakey, sizeof(cakey), "%s/private/ca.key", ca->sslpath);
+ snprintf(cacrt, sizeof(cacrt), "%s/ca.crt", ca->sslpath);
+
+ if (keyname)
+ ca_system(PATH_OPENSSL, "ca", "-config", ca->sslcnf,
+ "-keyfile", cakey, "-passin", ca->passfile, "-cert", cacrt,
+ "-revoke", path, ca->batch, NULL);
+
+ snprintf(path, sizeof(path), "%s/ca.crl", ca->sslpath);
+ ca_system(PATH_OPENSSL, "ca", "-config", ca->sslcnf, "-keyfile", cakey,
+ "-passin", ca->passfile, "-gencrl", "-cert", cacrt,
+ "-crldays", "365", "-out", path, ca->batch, NULL);
return (0);
}
@@ -963,11 +949,9 @@ ca_setup(char *caname, int create, int quiet, char *pass)
ca->caname = strdup(caname);
snprintf(ca->sslpath, sizeof(ca->sslpath), SSLDIR "/%s", caname);
- strlcpy(ca->passfile, ca->sslpath, sizeof(ca->passfile));
- strlcat(ca->passfile, "/ikeca.passwd", sizeof(ca->passfile));
if (quiet)
- strlcpy(ca->batch, "-batch ", sizeof(ca->batch));
+ ca->batch = "-batch";
if (create == 0 && stat(ca->sslpath, &st) == -1) {
free(ca->caname);
@@ -982,8 +966,45 @@ ca_setup(char *caname, int create, int quiet, char *pass)
if (mkdir(path, 0700) == -1 && errno != EEXIST)
err(1, "failed to create dir %s", path);
- if (create && stat(ca->passfile, &st) == -1 && errno == ENOENT)
- ca_newpass(ca->passfile, pass);
+ snprintf(path, sizeof(path), "%s/ikeca.passwd", ca->sslpath);
+ if (create && stat(path, &st) == -1 && errno == ENOENT)
+ ca_newpass(path, pass);
+ snprintf(ca->passfile, sizeof(ca->passfile), "file:%s", path);
return (ca);
}
+
+static void
+ca_system(char *arg, ...)
+{
+ va_list ap;
+ char **argv;
+ int n, status;
+ pid_t pid, cpid;
+
+ va_start(ap, arg);
+ n = 1;
+ while (va_arg(ap, char *) != NULL)
+ n++;
+ va_end(ap);
+ if ((argv = reallocarray(NULL, n + 1, sizeof(*argv))) == NULL)
+ err(1, "reallocarray");
+ va_start(ap, arg);
+ n = 1;
+ argv[0] = arg;
+ while ((argv[n] = va_arg(ap, char *)) != NULL)
+ n++;
+ va_end(ap);
+
+ switch (cpid = fork()) {
+ case -1:
+ return;
+ case 0:
+ execv(argv[0], argv);
+ _exit(127);
+ }
+
+ do {
+ pid = waitpid(cpid, &status, 0);
+ } while (pid == -1 && errno == EINTR);
+}
