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import unbound-1.7.3-10.el8

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CentOS Sources 2020-04-28 04:50:17 -04:00 committed by Andrew Lukoshko
parent e4a827766d
commit 35033b9f5e
3 changed files with 339 additions and 1 deletions
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218
SOURCES/unbound-1.7.3-ipsec-hook.patch Normal file
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@ -0,0 +1,218 @@
diff --git a/ipsecmod/ipsecmod.c b/ipsecmod/ipsecmod.c
index c8400c6..9e916d6 100644
--- a/ipsecmod/ipsecmod.c
+++ b/ipsecmod/ipsecmod.c
@@ -162,6 +162,71 @@ generate_request(struct module_qstate* qstate, int id, uint8_t* name,
}
/**
+ * Check if the string passed is a valid domain name with safe characters to
+ * pass to a shell.
+ * This will only allow:
+ * - digits
+ * - alphas
+ * - hyphen (not at the start)
+ * - dot (not at the start, or the only character)
+ * - underscore
+ * @param s: pointer to the string.
+ * @param slen: string's length.
+ * @return true if s only contains safe characters; false otherwise.
+ */
+static int
+domainname_has_safe_characters(char* s, size_t slen) {
+ size_t i;
+ for(i = 0; i < slen; i++) {
+ if(s[i] == '\0') return 1;
+ if((s[i] == '-' && i != 0)
+ || (s[i] == '.' && (i != 0 || s[1] == '\0'))
+ || (s[i] == '_') || (s[i] >= '0' && s[i] <= '9')
+ || (s[i] >= 'A' && s[i] <= 'Z')
+ || (s[i] >= 'a' && s[i] <= 'z')) {
+ continue;
+ }
+ return 0;
+ }
+ return 1;
+}
+
+/**
+ * Check if the stringified IPSECKEY RDATA contains safe characters to pass to
+ * a shell.
+ * This is only relevant for checking the gateway when the gateway type is 3
+ * (domainname).
+ * @param s: pointer to the string.
+ * @param slen: string's length.
+ * @return true if s contains only safe characters; false otherwise.
+ */
+static int
+ipseckey_has_safe_characters(char* s, size_t slen) {
+ int precedence, gateway_type, algorithm;
+ char* gateway;
+ gateway = (char*)calloc(slen, sizeof(char));
+ if(!gateway) {
+ log_err("ipsecmod: out of memory when calling the hook");
+ return 0;
+ }
+ if(sscanf(s, "%d %d %d %s ",
+ &precedence, &gateway_type, &algorithm, gateway) != 4) {
+ free(gateway);
+ return 0;
+ }
+ if(gateway_type != 3) {
+ free(gateway);
+ return 1;
+ }
+ if(domainname_has_safe_characters(gateway, slen)) {
+ free(gateway);
+ return 1;
+ }
+ free(gateway);
+ return 0;
+}
+
+/**
* Prepare the data and call the hook.
*
* @param qstate: query state.
@@ -175,7 +240,7 @@ call_hook(struct module_qstate* qstate, struct ipsecmod_qstate* iq,
{
size_t slen, tempdata_len, tempstring_len, i;
char str[65535], *s, *tempstring;
- int w;
+ int w = 0, w_temp, qtype;
struct ub_packed_rrset_key* rrset_key;
struct packed_rrset_data* rrset_data;
uint8_t *tempdata;
@@ -192,9 +257,9 @@ call_hook(struct module_qstate* qstate, struct ipsecmod_qstate* iq,
memset(s, 0, slen);
/* Copy the hook into the buffer. */
- sldns_str_print(&s, &slen, "%s", qstate->env->cfg->ipsecmod_hook);
+ w += sldns_str_print(&s, &slen, "%s", qstate->env->cfg->ipsecmod_hook);
/* Put space into the buffer. */
- sldns_str_print(&s, &slen, " ");
+ w += sldns_str_print(&s, &slen, " ");
/* Copy the qname into the buffer. */
tempstring = sldns_wire2str_dname(qstate->qinfo.qname,
qstate->qinfo.qname_len);
@@ -202,68 +267,96 @@ call_hook(struct module_qstate* qstate, struct ipsecmod_qstate* iq,
log_err("ipsecmod: out of memory when calling the hook");
return 0;
}
- sldns_str_print(&s, &slen, "\"%s\"", tempstring);
+ if(!domainname_has_safe_characters(tempstring, strlen(tempstring))) {
+ log_err("ipsecmod: qname has unsafe characters");
+ free(tempstring);
+ return 0;
+ }
+ w += sldns_str_print(&s, &slen, "\"%s\"", tempstring);
free(tempstring);
/* Put space into the buffer. */
- sldns_str_print(&s, &slen, " ");
+ w += sldns_str_print(&s, &slen, " ");
/* Copy the IPSECKEY TTL into the buffer. */
rrset_data = (struct packed_rrset_data*)iq->ipseckey_rrset->entry.data;
- sldns_str_print(&s, &slen, "\"%ld\"", (long)rrset_data->ttl);
+ w += sldns_str_print(&s, &slen, "\"%ld\"", (long)rrset_data->ttl);
/* Put space into the buffer. */
- sldns_str_print(&s, &slen, " ");
- /* Copy the A/AAAA record(s) into the buffer. Start and end this section
- * with a double quote. */
+ w += sldns_str_print(&s, &slen, " ");
rrset_key = reply_find_answer_rrset(&qstate->return_msg->qinfo,
qstate->return_msg->rep);
+ /* Double check that the records are indeed A/AAAA.
+ * This should never happen as this function is only executed for A/AAAA
+ * queries but make sure we don't pass anything other than A/AAAA to the
+ * shell. */
+ qtype = ntohs(rrset_key->rk.type);
+ if(qtype != LDNS_RR_TYPE_AAAA && qtype != LDNS_RR_TYPE_A) {
+ log_err("ipsecmod: Answer is not of A or AAAA type");
+ return 0;
+ }
rrset_data = (struct packed_rrset_data*)rrset_key->entry.data;
- sldns_str_print(&s, &slen, "\"");
+ /* Copy the A/AAAA record(s) into the buffer. Start and end this section
+ * with a double quote. */
+ w += sldns_str_print(&s, &slen, "\"");
for(i=0; i<rrset_data->count; i++) {
if(i > 0) {
/* Put space into the buffer. */
- sldns_str_print(&s, &slen, " ");
+ w += sldns_str_print(&s, &slen, " ");
}
/* Ignore the first two bytes, they are the rr_data len. */
- w = sldns_wire2str_rdata_buf(rrset_data->rr_data[i] + 2,
+ w_temp = sldns_wire2str_rdata_buf(rrset_data->rr_data[i] + 2,
rrset_data->rr_len[i] - 2, s, slen, qstate->qinfo.qtype);
- if(w < 0) {
+ if(w_temp < 0) {
/* Error in printout. */
- return -1;
- } else if((size_t)w >= slen) {
+ log_err("ipsecmod: Error in printing IP address");
+ return 0;
+ } else if((size_t)w_temp >= slen) {
s = NULL; /* We do not want str to point outside of buffer. */
slen = 0;
- return -1;
+ log_err("ipsecmod: shell command too long");
+ return 0;
} else {
- s += w;
- slen -= w;
+ s += w_temp;
+ slen -= w_temp;
+ w += w_temp;
}
}
- sldns_str_print(&s, &slen, "\"");
+ w += sldns_str_print(&s, &slen, "\"");
/* Put space into the buffer. */
- sldns_str_print(&s, &slen, " ");
+ w += sldns_str_print(&s, &slen, " ");
/* Copy the IPSECKEY record(s) into the buffer. Start and end this section
* with a double quote. */
- sldns_str_print(&s, &slen, "\"");
+ w += sldns_str_print(&s, &slen, "\"");
rrset_data = (struct packed_rrset_data*)iq->ipseckey_rrset->entry.data;
for(i=0; i<rrset_data->count; i++) {
if(i > 0) {
/* Put space into the buffer. */
- sldns_str_print(&s, &slen, " ");
+ w += sldns_str_print(&s, &slen, " ");
}
/* Ignore the first two bytes, they are the rr_data len. */
tempdata = rrset_data->rr_data[i] + 2;
tempdata_len = rrset_data->rr_len[i] - 2;
/* Save the buffer pointers. */
tempstring = s; tempstring_len = slen;
- w = sldns_wire2str_ipseckey_scan(&tempdata, &tempdata_len, &s, &slen,
- NULL, 0);
+ w_temp = sldns_wire2str_ipseckey_scan(&tempdata, &tempdata_len, &s,
+ &slen, NULL, 0);
/* There was an error when parsing the IPSECKEY; reset the buffer
* pointers to their previous values. */
- if(w == -1){
+ if(w_temp == -1) {
s = tempstring; slen = tempstring_len;
+ } else if(w_temp > 0) {
+ if(!ipseckey_has_safe_characters(
+ tempstring, tempstring_len - slen)) {
+ log_err("ipsecmod: ipseckey has unsafe characters");
+ return 0;
+ }
+ w += w_temp;
}
}
- sldns_str_print(&s, &slen, "\"");
- verbose(VERB_ALGO, "ipsecmod: hook command: '%s'", str);
+ w += sldns_str_print(&s, &slen, "\"");
+ if(w >= (int)sizeof(str)) {
+ log_err("ipsecmod: shell command too long");
+ return 0;
+ }
+ verbose(VERB_ALGO, "ipsecmod: shell command: '%s'", str);
/* ipsecmod-hook should return 0 on success. */
if(system(str) != 0)
return 0;

109
SOURCES/unbound-1.7.3-use-basic-lock.patch Normal file
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@ -0,0 +1,109 @@
diff --git a/util/log.c b/util/log.c
index 75a58f9..43dd572 100644
--- a/util/log.c
+++ b/util/log.c
@@ -70,7 +70,7 @@ static int key_created = 0;
static ub_thread_key_type logkey;
#ifndef THREADS_DISABLED
/** pthread mutex to protect FILE* */
-static lock_quick_type log_lock;
+static lock_basic_type log_lock;
#endif
/** the identity of this executable/process */
static const char* ident="unbound";
@@ -90,18 +90,18 @@ log_init(const char* filename, int use_syslog, const char* chrootdir)
if(!key_created) {
key_created = 1;
ub_thread_key_create(&logkey, NULL);
- lock_quick_init(&log_lock);
+ lock_basic_init(&log_lock);
}
- lock_quick_lock(&log_lock);
+ lock_basic_lock(&log_lock);
if(logfile
#if defined(HAVE_SYSLOG_H) || defined(UB_ON_WINDOWS)
|| logging_to_syslog
#endif
) {
- lock_quick_unlock(&log_lock); /* verbose() needs the lock */
+ lock_basic_unlock(&log_lock); /* verbose() needs the lock */
verbose(VERB_QUERY, "switching log to %s",
use_syslog?"syslog":(filename&&filename[0]?filename:"stderr"));
- lock_quick_lock(&log_lock);
+ lock_basic_lock(&log_lock);
}
if(logfile && logfile != stderr) {
FILE* cl = logfile;
@@ -119,7 +119,7 @@ log_init(const char* filename, int use_syslog, const char* chrootdir)
* chroot and no longer be able to access dev/log and so on */
openlog(ident, LOG_NDELAY, LOG_DAEMON);
logging_to_syslog = 1;
- lock_quick_unlock(&log_lock);
+ lock_basic_unlock(&log_lock);
return;
}
#elif defined(UB_ON_WINDOWS)
@@ -128,13 +128,13 @@ log_init(const char* filename, int use_syslog, const char* chrootdir)
}
if(use_syslog) {
logging_to_syslog = 1;
- lock_quick_unlock(&log_lock);
+ lock_basic_unlock(&log_lock);
return;
}
#endif /* HAVE_SYSLOG_H */
if(!filename || !filename[0]) {
logfile = stderr;
- lock_quick_unlock(&log_lock);
+ lock_basic_unlock(&log_lock);
return;
}
/* open the file for logging */
@@ -143,7 +143,7 @@ log_init(const char* filename, int use_syslog, const char* chrootdir)
filename += strlen(chrootdir);
f = fopen(filename, "a");
if(!f) {
- lock_quick_unlock(&log_lock);
+ lock_basic_unlock(&log_lock);
log_err("Could not open logfile %s: %s", filename,
strerror(errno));
return;
@@ -153,14 +153,14 @@ log_init(const char* filename, int use_syslog, const char* chrootdir)
setvbuf(f, NULL, (int)_IOLBF, 0);
#endif
logfile = f;
- lock_quick_unlock(&log_lock);
+ lock_basic_unlock(&log_lock);
}
void log_file(FILE *f)
{
- lock_quick_lock(&log_lock);
+ lock_basic_lock(&log_lock);
logfile = f;
- lock_quick_unlock(&log_lock);
+ lock_basic_unlock(&log_lock);
}
void log_thread_set(int* num)
@@ -250,9 +250,9 @@ log_vmsg(int pri, const char* type,
return;
}
#endif /* HAVE_SYSLOG_H */
- lock_quick_lock(&log_lock);
+ lock_basic_lock(&log_lock);
if(!logfile) {
- lock_quick_unlock(&log_lock);
+ lock_basic_unlock(&log_lock);
return;
}
if(log_now)
@@ -279,7 +279,7 @@ log_vmsg(int pri, const char* type,
/* line buffering does not work on windows */
fflush(logfile);
#endif
- lock_quick_unlock(&log_lock);
+ lock_basic_unlock(&log_lock);
}
/**

13
SPECS/unbound.spec
View File

@ -34,7 +34,7 @@
Summary: Validating, recursive, and caching DNS(SEC) resolver Summary: Validating, recursive, and caching DNS(SEC) resolver
Name: unbound Name: unbound
Version: 1.7.3 Version: 1.7.3
Release: 8%{?extra_version:.%{extra_version}}%{?dist} Release: 10%{?extra_version:.%{extra_version}}%{?dist}
License: BSD License: BSD
Url: https://www.unbound.net/ Url: https://www.unbound.net/
Source: https://www.unbound.net/downloads/%{name}-%{version}%{?extra_version}.tar.gz Source: https://www.unbound.net/downloads/%{name}-%{version}%{?extra_version}.tar.gz
@ -59,6 +59,8 @@ Patch2: unbound-1.7.2-python3-devel.patch
Patch3: unbound-1.7.2-python3-pkgconfig.patch Patch3: unbound-1.7.2-python3-pkgconfig.patch
Patch4: unbound-1.7.3-anchor-fallback.patch Patch4: unbound-1.7.3-anchor-fallback.patch
Patch5: unbound-1.7.3-host-any.patch Patch5: unbound-1.7.3-host-any.patch
Patch6: unbound-1.7.3-use-basic-lock.patch
Patch7: unbound-1.7.3-ipsec-hook.patch
BuildRequires: gcc, make BuildRequires: gcc, make
BuildRequires: flex, openssl-devel BuildRequires: flex, openssl-devel
@ -158,6 +160,8 @@ pushd %{pkgname}
%patch3 -p1 -b .python3 %patch3 -p1 -b .python3
%patch4 -p1 -b .anchor-fallback %patch4 -p1 -b .anchor-fallback
%patch5 -p1 -b .host-any %patch5 -p1 -b .host-any
%patch6 -p1 -b .use-basic-lock
%patch7 -p1 -b .ipsec-hook
# only for snapshots # only for snapshots
# autoreconf -iv # autoreconf -iv
@ -429,6 +433,13 @@ popd
%attr(0644,root,root) %config %{_sysconfdir}/%{name}/root.key %attr(0644,root,root) %config %{_sysconfdir}/%{name}/root.key
%changelog %changelog
* Tue Dec 10 2019 Tomas Korbar <tkorbar@redhat.com> - 1.7.3-10
- Secure ipsec mode (#1772061)
- CVE-2019-18934
* Tue Dec 10 2019 Tomas Korbar <tkorbar@redhat.com> - 1.7.3-9
- Use pthread_mutex_t locks when dealing with I/O operations (#1775708)
* Tue Jul 31 2018 Petr Menšík <pemensik@redhat.com> - 1.7.3-8 * Tue Jul 31 2018 Petr Menšík <pemensik@redhat.com> - 1.7.3-8
- Release memory in unbound-host - Release memory in unbound-host