fix(inputs.postgres*)!: Prevent leaking sensitive data in server tag

CHANGELOG.md

@@ -24,6 +24,9 @@
   consecutive messages exceeds the timeout.
   [#14837](https://github.com/influxdata/telegraf/pull/14828) sets the timeout
   to infinite (i.e zero) as this is the expected behavior.
+- With correctly sanitizing PostgreSQL addresses ([PR #14829](https://github.com/influxdata/telegraf/pull/14829))
+  the `server` tag value for a URI-format address might change in case it
+  contains spaces, backslashes or single-quotes in non-redacted parameters.
 
 ## v1.29.5 [2024-02-20]
 

plugins/inputs/postgresql/postgresql_test.go

@@ -2,6 +2,7 @@ package postgresql
 
 import (
 	"fmt"
+	"strings"
 	"testing"
 
 	"github.com/docker/go-connections/nat"
@@ -316,3 +317,239 @@ func TestPostgresqlDatabaseBlacklistTestIntegration(t *testing.T) {
 	require.False(t, foundTemplate0)
 	require.True(t, foundTemplate1)
 }
+
+func TestURIParsing(t *testing.T) {
+	tests := []struct {
+		name     string
+		uri      string
+		expected string
+	}{
+		{
+			name:     "short",
+			uri:      `postgres://localhost`,
+			expected: "host=localhost",
+		},
+		{
+			name:     "with port",
+			uri:      `postgres://localhost:5432`,
+			expected: "host=localhost port=5432",
+		},
+		{
+			name:     "with database",
+			uri:      `postgres://localhost/mydb`,
+			expected: "dbname=mydb host=localhost",
+		},
+		{
+			name:     "with additional parameters",
+			uri:      `postgres://localhost/mydb?application_name=pgxtest&search_path=myschema&connect_timeout=5`,
+			expected: "application_name=pgxtest connect_timeout=5 dbname=mydb host=localhost search_path=myschema",
+		},
+		{
+			name:     "with database setting in params",
+			uri:      `postgres://localhost:5432/?database=mydb`,
+			expected: "database=mydb host=localhost port=5432",
+		},
+		{
+			name:     "with authentication",
+			uri:      `postgres://jack:secret@localhost:5432/mydb?sslmode=prefer`,
+			expected: "dbname=mydb host=localhost password=secret port=5432 sslmode=prefer user=jack",
+		},
+		{
+			name:     "with spaces",
+			uri:      `postgres://jack%20hunter:secret@localhost/mydb?application_name=pgx%20test`,
+			expected: "application_name='pgx test' dbname=mydb host=localhost password=secret user='jack hunter'",
+		},
+		{
+			name:     "with equal signs",
+			uri:      `postgres://jack%20hunter:secret@localhost/mydb?application_name=pgx%3Dtest`,
+			expected: "application_name='pgx=test' dbname=mydb host=localhost password=secret user='jack hunter'",
+		},
+		{
+			name:     "multiple hosts",
+			uri:      `postgres://jack:secret@foo:1,bar:2,baz:3/mydb?sslmode=disable`,
+			expected: "dbname=mydb host=foo,bar,baz password=secret port=1,2,3 sslmode=disable user=jack",
+		},
+		{
+			name:     "multiple hosts without ports",
+			uri:      `postgres://jack:secret@foo,bar,baz/mydb?sslmode=disable`,
+			expected: "dbname=mydb host=foo,bar,baz password=secret sslmode=disable user=jack",
+		},
+	}
+
+	for _, tt := range tests {
+		// Key value without spaces around equal sign
+		t.Run(tt.name, func(t *testing.T) {
+			actual, err := toKeyValue(tt.uri)
+			require.NoError(t, err)
+			require.Equalf(t, tt.expected, actual, "initial: %s", tt.uri)
+		})
+	}
+}
+
+func TestSanitizeAddressKeyValue(t *testing.T) {
+	keys := []string{"password", "sslcert", "sslkey", "sslmode", "sslrootcert"}
+	tests := []struct {
+		name  string
+		value string
+	}{
+		{
+			name:  "simple text",
+			value: `foo`,
+		},
+		{
+			name:  "empty values",
+			value: `''`,
+		},
+		{
+			name:  "space in value",
+			value: `'foo bar'`,
+		},
+		{
+			name:  "equal sign in value",
+			value: `'foo=bar'`,
+		},
+		{
+			name:  "escaped quote",
+			value: `'foo\'s bar'`,
+		},
+		{
+			name:  "escaped quote no space",
+			value: `\'foobar\'s\'`,
+		},
+		{
+			name:  "escaped backslash",
+			value: `'foo bar\\'`,
+		},
+		{
+			name:  "escaped quote and backslash",
+			value: `'foo\\\'s bar'`,
+		},
+		{
+			name:  "two escaped backslashes",
+			value: `'foo bar\\\\'`,
+		},
+		{
+			name:  "multiple inline spaces",
+			value: "'foo     \t bar'",
+		},
+		{
+			name:  "leading space",
+			value: `' foo bar'`,
+		},
+		{
+			name:  "trailing space",
+			value: `'foo bar '`,
+		},
+		{
+			name:  "multiple equal signs",
+			value: `'foo===bar'`,
+		},
+		{
+			name:  "leading equal sign",
+			value: `'=foo bar'`,
+		},
+		{
+			name:  "trailing equal sign",
+			value: `'foo bar='`,
+		},
+		{
+			name:  "mix of equal signs and spaces",
+			value: "'foo = a\t===\tbar'",
+		},
+	}
+
+	for _, tt := range tests {
+		// Key value without spaces around equal sign
+		t.Run(tt.name, func(t *testing.T) {
+			// Generate the DSN from the given keys and value
+			parts := make([]string, 0, len(keys))
+			for _, k := range keys {
+				parts = append(parts, k+"="+tt.value)
+			}
+			dsn := strings.Join(parts, " canary=ok ")
+
+			plugin := &Postgresql{
+				Service: Service{
+					Address: config.NewSecret([]byte(dsn)),
+				},
+			}
+
+			expected := strings.Join(make([]string, len(keys)), "canary=ok ")
+			expected = strings.TrimSpace(expected)
+			actual, err := plugin.SanitizedAddress()
+			require.NoError(t, err)
+			require.Equalf(t, expected, actual, "initial: %s", dsn)
+		})
+
+		// Key value with spaces around equal sign
+		t.Run("spaced "+tt.name, func(t *testing.T) {
+			// Generate the DSN from the given keys and value
+			parts := make([]string, 0, len(keys))
+			for _, k := range keys {
+				parts = append(parts, k+" = "+tt.value)
+			}
+			dsn := strings.Join(parts, " canary=ok ")
+
+			plugin := &Postgresql{
+				Service: Service{
+					Address: config.NewSecret([]byte(dsn)),
+				},
+			}
+
+			expected := strings.Join(make([]string, len(keys)), "canary=ok ")
+			expected = strings.TrimSpace(expected)
+			actual, err := plugin.SanitizedAddress()
+			require.NoError(t, err)
+			require.Equalf(t, expected, actual, "initial: %s", dsn)
+		})
+	}
+}
+
+func TestSanitizeAddressURI(t *testing.T) {
+	keys := []string{"password", "sslcert", "sslkey", "sslmode", "sslrootcert"}
+	tests := []struct {
+		name  string
+		value string
+	}{
+		{
+			name:  "simple text",
+			value: `foo`,
+		},
+		{
+			name:  "empty values",
+			value: ``,
+		},
+		{
+			name:  "space in value",
+			value: `foo bar`,
+		},
+		{
+			name:  "equal sign in value",
+			value: `foo=bar`,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// Generate the DSN from the given keys and value
+			value := strings.ReplaceAll(tt.value, "=", "%3D")
+			value = strings.ReplaceAll(value, " ", "%20")
+			parts := make([]string, 0, len(keys))
+			for _, k := range keys {
+				parts = append(parts, k+"="+value)
+			}
+			dsn := "postgresql://user:passwd@localhost:5432/db?" + strings.Join(parts, "&")
+
+			plugin := &Postgresql{
+				Service: Service{
+					Address: config.NewSecret([]byte(dsn)),
+				},
+			}
+
+			expected := "dbname=db host=localhost port=5432 user=user"
+			actual, err := plugin.SanitizedAddress()
+			require.NoError(t, err)
+			require.Equalf(t, expected, actual, "initial: %s", dsn)
+		})
+	}
+}