diff options
Diffstat (limited to 'debian/patches/debian-banner.patch')
| -rw-r--r-- | debian/patches/debian-banner.patch | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/debian/patches/debian-banner.patch b/debian/patches/debian-banner.patch new file mode 100644 index 0000000..2c32879 --- /dev/null +++ b/debian/patches/debian-banner.patch @@ -0,0 +1,162 @@ +From 2d3ac49df11f0aed81f35ce9588eb2c578ec98f2 Mon Sep 17 00:00:00 2001 +From: Kees Cook <kees@debian.org> +Date: Sun, 9 Feb 2014 16:10:06 +0000 +Subject: Add DebianBanner server configuration option + +Setting this to "no" causes sshd to omit the Debian revision from its +initial protocol handshake, for those scared by package-versioning.patch. + +Bug-Debian: http://bugs.debian.org/562048 +Forwarded: not-needed +Last-Update: 2023-01-02 + +Patch-Name: debian-banner.patch +--- + kex.c | 5 +++-- + kex.h | 2 +- + servconf.c | 9 +++++++++ + servconf.h | 2 ++ + sshconnect.c | 2 +- + sshd.c | 2 +- + sshd_config.5 | 5 +++++ + 7 files changed, 22 insertions(+), 5 deletions(-) + +diff --git a/kex.c b/kex.c +index 32858e65c..e7b7316c7 100644 +--- a/kex.c ++++ b/kex.c +@@ -1272,7 +1272,7 @@ send_error(struct ssh *ssh, char *msg) + */ + int + kex_exchange_identification(struct ssh *ssh, int timeout_ms, +- const char *version_addendum) ++ int debian_banner, const char *version_addendum) + { + int remote_major, remote_minor, mismatch, oerrno = 0; + size_t len, n; +@@ -1290,7 +1290,8 @@ kex_exchange_identification(struct ssh *ssh, int timeout_ms, + if (version_addendum != NULL && *version_addendum == '\0') + version_addendum = NULL; + if ((r = sshbuf_putf(our_version, "SSH-%d.%d-%.100s%s%s\r\n", +- PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, SSH_RELEASE, ++ PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, ++ debian_banner ? SSH_RELEASE : SSH_RELEASE_MINIMUM, + version_addendum == NULL ? "" : " ", + version_addendum == NULL ? "" : version_addendum)) != 0) { + oerrno = errno; +diff --git a/kex.h b/kex.h +index 240dca89d..e356f5ed0 100644 +--- a/kex.h ++++ b/kex.h +@@ -200,7 +200,7 @@ char *kex_names_cat(const char *, const char *); + int kex_assemble_names(char **, const char *, const char *); + int kex_gss_names_valid(const char *); + +-int kex_exchange_identification(struct ssh *, int, const char *); ++int kex_exchange_identification(struct ssh *, int, int, const char *); + + struct kex *kex_new(void); + int kex_ready(struct ssh *, char *[PROPOSAL_MAX]); +diff --git a/servconf.c b/servconf.c +index 6529f2736..4ecbca8ed 100644 +--- a/servconf.c ++++ b/servconf.c +@@ -203,6 +203,7 @@ initialize_server_options(ServerOptions *options) + options->channel_timeouts = NULL; + options->num_channel_timeouts = 0; + options->unused_connection_timeout = -1; ++ options->debian_banner = -1; + } + + /* Returns 1 if a string option is unset or set to "none" or 0 otherwise. */ +@@ -461,6 +462,8 @@ fill_default_server_options(ServerOptions *options) + options->required_rsa_size = SSH_RSA_MINIMUM_MODULUS_SIZE; + if (options->unused_connection_timeout == -1) + options->unused_connection_timeout = 0; ++ if (options->debian_banner == -1) ++ options->debian_banner = 1; + + assemble_algorithms(options); + +@@ -546,6 +549,7 @@ typedef enum { + sAllowStreamLocalForwarding, sFingerprintHash, sDisableForwarding, + sExposeAuthInfo, sRDomain, sPubkeyAuthOptions, sSecurityKeyProvider, + sRequiredRSASize, sChannelTimeout, sUnusedConnectionTimeout, ++ sDebianBanner, + sDeprecated, sIgnore, sUnsupported + } ServerOpCodes; + +@@ -719,6 +723,7 @@ static struct { + { "requiredrsasize", sRequiredRSASize, SSHCFG_ALL }, + { "channeltimeout", sChannelTimeout, SSHCFG_ALL }, + { "unusedconnectiontimeout", sUnusedConnectionTimeout, SSHCFG_ALL }, ++ { "debianbanner", sDebianBanner, SSHCFG_GLOBAL }, + { NULL, sBadOption, 0 } + }; + +@@ -2596,6 +2601,10 @@ process_server_config_line_depth(ServerOptions *options, char *line, + } + goto parse_time; + ++ case sDebianBanner: ++ intptr = &options->debian_banner; ++ goto parse_flag; ++ + case sDeprecated: + case sIgnore: + case sUnsupported: +diff --git a/servconf.h b/servconf.h +index 38a68d576..e142cf77a 100644 +--- a/servconf.h ++++ b/servconf.h +@@ -238,6 +238,8 @@ typedef struct { + u_int num_channel_timeouts; + + int unused_connection_timeout; ++ ++ int debian_banner; + } ServerOptions; + + /* Information about the incoming connection as used by Match */ +diff --git a/sshconnect.c b/sshconnect.c +index 77a3080ba..dbb3c98a7 100644 +--- a/sshconnect.c ++++ b/sshconnect.c +@@ -1574,7 +1574,7 @@ ssh_login(struct ssh *ssh, Sensitive *sensitive, const char *orighost, + lowercase(host); + + /* Exchange protocol version identification strings with the server. */ +- if ((r = kex_exchange_identification(ssh, timeout_ms, NULL)) != 0) ++ if ((r = kex_exchange_identification(ssh, timeout_ms, 1, NULL)) != 0) + sshpkt_fatal(ssh, r, "banner exchange"); + + /* Put the connection into non-blocking mode. */ +diff --git a/sshd.c b/sshd.c +index dd4a19131..b4ee435e5 100644 +--- a/sshd.c ++++ b/sshd.c +@@ -2238,7 +2238,7 @@ main(int ac, char **av) + if (!debug_flag) + alarm(options.login_grace_time); + +- if ((r = kex_exchange_identification(ssh, -1, ++ if ((r = kex_exchange_identification(ssh, -1, options.debian_banner, + options.version_addendum)) != 0) + sshpkt_fatal(ssh, r, "banner exchange"); + +diff --git a/sshd_config.5 b/sshd_config.5 +index eb58750a5..2c6ec76cb 100644 +--- a/sshd_config.5 ++++ b/sshd_config.5 +@@ -615,6 +615,11 @@ or + .Cm no . + The default is + .Cm yes . ++.It Cm DebianBanner ++Specifies whether the distribution-specified extra version suffix is ++included during initial protocol handshake. ++The default is ++.Cm yes . + .It Cm DenyGroups + This keyword can be followed by a list of group name patterns, separated + by spaces. |