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..82cc37c --- /dev/null +++ b/debian/patches/debian-banner.patch @@ -0,0 +1,162 @@ +From 6353ee79cc71ef33a0a34d2d769a5fe327f6260d 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: 2020-06-07 + +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 ce7bb5b3b..763c45536 100644 +--- a/kex.c ++++ b/kex.c +@@ -1225,7 +1225,7 @@ 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, i, n; +@@ -1243,7 +1243,8 @@ 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 fe7141414..938dca03b 100644 +--- a/kex.h ++++ b/kex.h +@@ -194,7 +194,7 @@ 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 21abe41ac..f9eb778d6 100644 +--- a/servconf.c ++++ b/servconf.c +@@ -195,6 +195,7 @@ initialize_server_options(ServerOptions *options) + options->fingerprint_hash = -1; + options->disable_forwarding = -1; + options->expose_userauth_info = -1; ++ options->debian_banner = -1; + } + + /* Returns 1 if a string option is unset or set to "none" or 0 otherwise. */ +@@ -469,6 +470,8 @@ fill_default_server_options(ServerOptions *options) + options->expose_userauth_info = 0; + if (options->sk_provider == NULL) + options->sk_provider = xstrdup("internal"); ++ if (options->debian_banner == -1) ++ options->debian_banner = 1; + + assemble_algorithms(options); + +@@ -548,6 +551,7 @@ typedef enum { + sStreamLocalBindMask, sStreamLocalBindUnlink, + sAllowStreamLocalForwarding, sFingerprintHash, sDisableForwarding, + sExposeAuthInfo, sRDomain, sPubkeyAuthOptions, sSecurityKeyProvider, ++ sDebianBanner, + sDeprecated, sIgnore, sUnsupported + } ServerOpCodes; + +@@ -712,6 +716,7 @@ static struct { + { "rdomain", sRDomain, SSHCFG_ALL }, + { "casignaturealgorithms", sCASignatureAlgorithms, SSHCFG_ALL }, + { "securitykeyprovider", sSecurityKeyProvider, SSHCFG_GLOBAL }, ++ { "debianbanner", sDebianBanner, SSHCFG_GLOBAL }, + { NULL, sBadOption, 0 } + }; + +@@ -2402,6 +2407,10 @@ process_server_config_line_depth(ServerOptions *options, char *line, + *charptr = xstrdup(arg); + break; + ++ case sDebianBanner: ++ intptr = &options->debian_banner; ++ goto parse_flag; ++ + case sDeprecated: + case sIgnore: + case sUnsupported: +diff --git a/servconf.h b/servconf.h +index f10908e5b..4afdf24d0 100644 +--- a/servconf.h ++++ b/servconf.h +@@ -227,6 +227,8 @@ typedef struct { + int expose_userauth_info; + u_int64_t timing_secret; + char *sk_provider; ++ ++ int debian_banner; + } ServerOptions; + + /* Information about the incoming connection as used by Match */ +diff --git a/sshconnect.c b/sshconnect.c +index 3ae20b74e..bab3916d8 100644 +--- a/sshconnect.c ++++ b/sshconnect.c +@@ -1296,7 +1296,7 @@ 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 38d281ab4..50f2726bf 100644 +--- a/sshd.c ++++ b/sshd.c +@@ -2232,7 +2232,7 @@ 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 6457620bb..33dc0c675 100644 +--- a/sshd_config.5 ++++ b/sshd_config.5 +@@ -540,6 +540,11 @@ 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. |